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Bashir F, Kovács S, Ábrahám Á, Nagy K, Ayaydin F, Valkony-Kelemen I, Ferenc G, Galajda P, Tóth SZ, Sass L, Kós PB, Vass I, Szabó M. Viable protoplast formation of the coral endosymbiont alga Symbiodinium spp. in a microfluidics platform. LAB ON A CHIP 2022; 22:2986-2999. [PMID: 35588270 DOI: 10.1039/d2lc00130f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Symbiodiniaceae is an important dinoflagellate family which lives in endosymbiosis with reef invertebrates, including coral polyps, making them central to the holobiont. With coral reefs currently under extreme threat from climate change, there is a pressing need to improve our understanding on the stress tolerance and stress avoidance mechanisms of Symbiodinium spp. Reactive oxygen species (ROS) such as singlet oxygen are central players in mediating various stress responses; however, the detection of ROS using specific dyes is still far from definitive in intact Symbiodinium cells due to the hindrance of uptake of certain fluorescent dyes because of the presence of the cell wall. Protoplast technology provides a promising platform for studying oxidative stress with the main advantage of removed cell wall, however the preparation of viable protoplasts remains a significant challenge. Previous studies have successfully applied cellulose-based protoplast preparation in Symbiodiniaceae; however, the protoplast formation and regeneration process was found to be suboptimal. Here, we present a microfluidics-based platform which allowed protoplast isolation from individually trapped Symbiodinium cells, by using a precisely adjusted flow of cell wall digestion enzymes (cellulase and macerozyme). Trapped single cells exhibited characteristic changes in their morphology, cessation of cell division and a slight decrease in photosynthetic activity during protoplast formation. Following digestion and transfer to regeneration medium, protoplasts remained photosynthetically active, regrew cell walls, regained motility, and entered exponential growth. Elevated flow rates in the microfluidic chambers resulted in somewhat faster protoplast formation; however, cell wall digestion at higher flow rates partially compromised photosynthetic activity. Physiologically competent protoplasts prepared from trapped cells in microfluidic chambers allowed for the first time the visualization of the intracellular localization of singlet oxygen (using Singlet Oxygen Sensor Green dye) in Symbiodiniaceae, potentially opening new avenues for studying oxidative stress.
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Affiliation(s)
- Faiza Bashir
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
- Doctoral School of Biology, University of Szeged, Szeged, Hungary
| | - Sándor Kovács
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
| | - Ágnes Ábrahám
- Institute of Biophysics, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
- Doctoral School of Multidisciplinary Medical Sciences, University of Szeged, Szeged, Hungary
| | - Krisztina Nagy
- Institute of Biophysics, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Ferhan Ayaydin
- Cellular Imaging Laboratory, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Ildikó Valkony-Kelemen
- Cellular Imaging Laboratory, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Györgyi Ferenc
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
| | - Péter Galajda
- Institute of Biophysics, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Szilvia Z Tóth
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
| | - László Sass
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
| | - Péter B Kós
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
- Department of Biotechnology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Imre Vass
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
| | - Milán Szabó
- Institute of Plant Biology, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary.
- Climate Change Cluster, University of Technology Sydney, Australia
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52
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Photophysiological response of Symbiodiniaceae single cells to temperature stress. THE ISME JOURNAL 2022; 16:2060-2064. [PMID: 35474114 PMCID: PMC9296599 DOI: 10.1038/s41396-022-01243-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 04/05/2022] [Accepted: 04/08/2022] [Indexed: 11/22/2022]
Abstract
Photosynthetic dinoflagellates in the family Symbiodiniaceae engage in symbiosis with scleractinian corals. As coral ‘bleaching’ is partly governed by the thermal sensitivity of different Symbiodiniaceae lineages, numerous studies have investigated their temperature sensitivity. However, the systematic identification of single-cells with increased temperature resistance among these dinoflagellates has remained inaccessible, mostly due to a lack of technologies operating at the microscale. Here, we employed a unique combination of microfluidics, miniaturized temperature control, and chlorophyll fluorometry to characterize the single-cell heterogeneity among five representative species within the Symbiodiniaceae family under temperature stress. We monitored single-cell maximum quantum yields (Fv/Fm) of photosystem (PS) II under increasing temperature stress (22‒39 °C, + 1 °C every 15 min), and detected a significant Fv/Fm reduction at lineage-specific temperatures ranging from 28 °C to 34 °C alongside a 40- to 180- fold increase in intraspecific heterogeneity under elevated temperatures (>31 °C). We discovered that the initial Fv/Fm of a cell could predict the same cell’s ability to perform PSII photochemistry under moderate temperature stress (<32 °C), suggesting its use as a proxy for measuring the thermal sensitivity among Symbiodiniaceae. In combination, our study highlights the heterogeneous thermal sensitivity among photosynthetic Symbiodiniaceae and adds critical resolution to our understanding of temperature-induced coral bleaching.
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Giddens J, Kobayashi DR, Mukai GNM, Asher J, Birkeland C, Fitchett M, Hixon MA, Hutchinson M, Mundy BC, O’Malley JM, Sabater M, Scott M, Stahl J, Toonen R, Trianni M, Woodworth-Jefcoats PA, Wren JLK, Nelson M. Assessing the vulnerability of marine life to climate change in the Pacific Islands region. PLoS One 2022; 17:e0270930. [PMID: 35802686 PMCID: PMC9269963 DOI: 10.1371/journal.pone.0270930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 06/20/2022] [Indexed: 11/18/2022] Open
Abstract
Our changing climate poses growing challenges for effective management of marine life, ocean ecosystems, and human communities. Which species are most vulnerable to climate change, and where should management focus efforts to reduce these risks? To address these questions, the National Oceanic and Atmospheric Administration (NOAA) Fisheries Climate Science Strategy called for vulnerability assessments in each of NOAA’s ocean regions. The Pacific Islands Vulnerability Assessment (PIVA) project assessed the susceptibility of 83 marine species to the impacts of climate change projected to 2055. In a standard Rapid Vulnerability Assessment framework, this project applied expert knowledge, literature review, and climate projection models to synthesize the best available science towards answering these questions. Here we: (1) provide a relative climate vulnerability ranking across species; (2) identify key attributes and factors that drive vulnerability; and (3) identify critical data gaps in understanding climate change impacts to marine life. The invertebrate group was ranked most vulnerable and pelagic and coastal groups not associated with coral reefs were ranked least vulnerable. Sea surface temperature, ocean acidification, and oxygen concentration were the main exposure drivers of vulnerability. Early Life History Survival and Settlement Requirements was the most data deficient of the sensitivity attributes considered in the assessment. The sensitivity of many coral reef fishes ranged between Low and Moderate, which is likely underestimated given that reef species depend on a biogenic habitat that is extremely threatened by climate change. The standard assessment methodology originally developed in the Northeast US, did not capture the additional complexity of the Pacific region, such as the diversity, varied horizontal and vertical distributions, extent of coral reef habitats, the degree of dependence on vulnerable habitat, and wide range of taxa, including data-poor species. Within these limitations, this project identified research needs to sustain marine life in a changing climate.
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Affiliation(s)
- Jonatha Giddens
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
- National Geographic Society Exploration Technology Lab, Washington, DC, United States of America
| | - Donald R. Kobayashi
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, Hawaiʻi, United States of America
- * E-mail:
| | - Gabriella N. M. Mukai
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
- School of Life Sciences, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Jacob Asher
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
- The Red Sea Development Company, Riyadh, KSA
| | - Charles Birkeland
- School of Life Sciences, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Mark Fitchett
- Western Pacific Regional Fishery Management Council, Honolulu, Hawaiʻi, United States of America
| | - Mark A. Hixon
- School of Life Sciences, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Melanie Hutchinson
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Bruce C. Mundy
- Ocean Research Explorations, Honolulu, Hawaiʻi, United States of America
| | - Joseph M. O’Malley
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, Hawaiʻi, United States of America
| | - Marlowe Sabater
- Western Pacific Regional Fishery Management Council, Honolulu, Hawaiʻi, United States of America
| | - Molly Scott
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Jennifer Stahl
- Cooperative Institute for Marine and Atmospheric Research, University of Hawai‘i at Mānoa, Honolulu, Hawaiʻi, United States of America
| | - Rob Toonen
- Hawai‘i Institute of Marine Biology, University of Hawai‘i at Mānoa, Kāne‘ohe, Hawaiʻi, United States of America
| | - Michael Trianni
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, Hawaiʻi, United States of America
| | - Phoebe A. Woodworth-Jefcoats
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, Hawaiʻi, United States of America
| | - Johanna L. K. Wren
- National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, Honolulu, Hawaiʻi, United States of America
| | - Mark Nelson
- Office of Science and Technology, National Oceanic and Atmospheric Administration, Silver Spring, Maryland, United States of America
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Clark V, Mello-Athayde MA, Dove S. Colonies of Acropora formosa with greater survival potential have reduced calcification rates. PLoS One 2022; 17:e0269526. [PMID: 35679252 PMCID: PMC9182694 DOI: 10.1371/journal.pone.0269526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 05/23/2022] [Indexed: 11/18/2022] Open
Abstract
Coral reefs are facing increasingly devasting impacts from ocean warming and acidification due to anthropogenic climate change. In addition to reducing greenhouse gas emissions, potential solutions have focused either on reducing light stress during heating, or on the potential for identifying or engineering “super corals”. A large subset of these studies, however, have tended to focus primarily on the bleaching response of corals, and assume erroneously that corals that bleach earlier in a thermal event die first. Here, we explore how survival, observable bleaching, coral skeletal growth (as branch extension and densification), and coral tissue growth (protein and lipid concentrations) varies for conspecifics collected from distinctive reef zones at Heron Island on the Southern Great Barrier Reef. A reciprocal transplantation experiment was undertaken using the dominant reef building coral (Acropora formosa) between the highly variable reef flat and the less variable reef slope environments. Coral colonies originating from the reef flat had higher rates of survival and amassed greater protein densities but calcified at reduced rates compared to conspecifics originating from the reef slope. The energetics of both populations however potentially benefited from greater light intensity present in the shallows. Reef flat origin corals moved to the lower light intensity of the reef slope reduced protein density and calcification rates. For A. formosa, genetic differences, or long-term entrainment to a highly variable environment, appeared to promote coral survival at the expense of calcification. The response decouples coral survival from carbonate coral reef resilience, a response that was further exacerbated by reductions in irradiance. As we begin to discuss interventions necessitated by the CO2 that has already been released into the atmosphere, we need to prioritise our focus on the properties that maintain valuable carbonate ecosystems. Rapid and dense calcification by corals such as branching Acropora is essential to the ability of carbonate coral reefs to rebound following disturbance events and maintain 3D structure but may be the first property that is sacrificed to enable coral genet survival under stress.
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Affiliation(s)
- Vanessa Clark
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Queensland, St. Lucia, Queensland, Australia
- * E-mail:
| | - Matheus A. Mello-Athayde
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Queensland, St. Lucia, Queensland, Australia
| | - Sophie Dove
- School of Biological Sciences, The University of Queensland, St. Lucia, Queensland, Australia
- ARC Centre of Excellence for Coral Reef Studies, The University of Queensland, St. Lucia, Queensland, Australia
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55
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Woo S, Yum S. Transcriptional response of the azooxanthellate octocoral Scleronephthya gracillimum to seawater acidification and thermal stress. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART D, GENOMICS & PROTEOMICS 2022; 42:100978. [PMID: 35259638 DOI: 10.1016/j.cbd.2022.100978] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 01/28/2022] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
The stress responses to increased seawater temperature and marine acidification were investigated using a microarray to reveal transcriptional changes in S. gracillimum. For the study, corals were exposed to different stress experiments; high temperature only (26 °C, 28 °C and 30 °C), low-pH only (pH 7.5, pH 7.0 and pH 6.5) and dual stress experiments (28 °C + pH 7.8, 28 °C + pH 7.5 and 28 °C + pH 7.0), mortality and morphological changes in 24 h exposure experiments were investigated. The survival rates of each experimental group were observed. The gene expression changes in single and dual stress exposed coals were measured and the differentially expressed genes were classified with gene ontology analysis. The top three enriched gene ontology terms of DEGs in response to dual stress were metal ion binding (23.4%), extracellular region (17.2%), and calcium ion binding (12.8%). The gene showing the greatest increase in expression as a response to the dual stress was hemagglutinin/amebocyte aggregation factor, followed by interferon-inducible GTPase 5 and the gene showing the greatest decrease as a response to the dual stress was Fas-associating death domain-containing protein, followed by oxidase 2. These results represented the transcriptomic study focused on the stress responses of the temperate asymbiotic soft coral exposed to single and dual stresses. The combined effect of thermal and acidification stress on corals triggered the negative regulation of ion binding and extracellular matrix coding genes and these genes might serve as a basis for research into coral-specific adaptations to stress responses and global climate change.
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Affiliation(s)
- Seonock Woo
- Marine Biotechnology Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, South Korea
| | - Seungshic Yum
- Ecological Risk Research Division, Korea Institute of Ocean Sciences and Technology, Geoje 53201, South Korea; KIOST School, University of Science and Technology, Geoje 53201, South Korea.
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56
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Cowen LJ, Putnam HM. Bioinformatics of Corals: Investigating Heterogeneous Omics Data from Coral Holobionts for Insight into Reef Health and Resilience. Annu Rev Biomed Data Sci 2022; 5:205-231. [PMID: 35537462 DOI: 10.1146/annurev-biodatasci-122120-030732] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Coral reefs are home to over two million species and provide habitat for roughly 25% of all marine animals, but they are being severely threatened by pollution and climate change. A large amount of genomic, transcriptomic, and other omics data is becoming increasingly available from different species of reef-building corals, the unicellular dinoflagellates, and the coral microbiome (bacteria, archaea, viruses, fungi, etc.). Such new data present an opportunity for bioinformatics researchers and computational biologists to contribute to a timely, compelling, and urgent investigation of critical factors that influence reef health and resilience. Expected final online publication date for the Annual Review of Biomedical Data Science, Volume 5 is August 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Lenore J Cowen
- Department of Computer Science, Tufts University, Medford, Massachusetts, USA;
| | - Hollie M Putnam
- Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island, USA;
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57
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Raharinirina NA, Acevedo-Trejos E, Merico A. Modelling the acclimation capacity of coral reefs to a warming ocean. PLoS Comput Biol 2022; 18:e1010099. [PMID: 35533201 PMCID: PMC9119535 DOI: 10.1371/journal.pcbi.1010099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 05/19/2022] [Accepted: 04/12/2022] [Indexed: 12/04/2022] Open
Abstract
The symbiotic relationship between corals and photosynthetic algae is the foundation of coral reef ecosystems. This relationship breaks down, leading to coral death, when sea temperature exceeds the thermal tolerance of the coral-algae complex. While acclimation via phenotypic plasticity at the organismal level is an important mechanism for corals to cope with global warming, community-based shifts in response to acclimating capacities may give valuable indications about the future of corals at a regional scale. Reliable regional-scale predictions, however, are hampered by uncertainties on the speed with which coral communities will be able to acclimate. Here we present a trait-based, acclimation dynamics model, which we use in combination with observational data, to provide a first, crude estimate of the speed of coral acclimation at the community level and to investigate the effects of different global warming scenarios on three iconic reef ecosystems of the tropics: Great Barrier Reef, South East Asia, and Caribbean. The model predicts that coral acclimation may confer some level of protection by delaying the decline of some reefs such as the Great Barrier Reef. However, the current rates of acclimation will not be sufficient to rescue corals from global warming. Based on our estimates of coral acclimation capacities, the model results suggest substantial declines in coral abundances in all three regions, ranging from 12% to 55%, depending on the region and on the climate change scenario considered. Our results highlight the importance and urgency of precise assessments and quantitative estimates, for example through laboratory experiments, of the natural acclimation capacity of corals and of the speed with which corals may be able to acclimate to global warming. Tropical coral reefs are among the most productive and diverse ecosystems on Earth. The success of these ecosystems depends on a symbiotic relationship between corals and unicellular algae. This relationship breaks down when water temperature increases above certain levels causing massive coral deaths. Therefore, the future of coral reef ecosystems depends on the capacity of corals to acclimate to current warming rates. Despite many studies have tried to predict the future of coral reefs, these predictions are impaired by uncertainties related to the speed with which corals can acclimate. We developed a model in which corals can acclimate to changing temperature. By comparing model results with observations of coral cover, we estimated the speed of coral acclimation at the community level in different regions of the tropics. Using this information, we quantified the future changes in coral abundances under different warming scenarios. We found that corals of the Great Barrier Reef have higher acclimation capacities than those of other regions. Our results showed substantial coral declines in South East Asia and Caribbean, especially under the highest warming scenarios. Thus, we provide evidence that natural acclimation alone may not be sufficient to offset the decline of corals caused by the expected warming trends.
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Affiliation(s)
- Nomenjanahary Alexia Raharinirina
- Department of Integrated Modelling, Leibniz Centre for Tropical Marine Research, Bremen, Germany
- Department of Physics & Earth Sciences, Jacobs University Bremen, Bremen, Germany
| | - Esteban Acevedo-Trejos
- Department of Integrated Modelling, Leibniz Centre for Tropical Marine Research, Bremen, Germany
| | - Agostino Merico
- Department of Integrated Modelling, Leibniz Centre for Tropical Marine Research, Bremen, Germany
- Department of Physics & Earth Sciences, Jacobs University Bremen, Bremen, Germany
- * E-mail:
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Bejarano I, Orenes-Salazar V, Bento R, García-Charton JA, Mateos-Molina D. Coral reefs at Sir Bu Nair Island: An offshore refuge of Acropora in the southern Arabian Gulf. MARINE POLLUTION BULLETIN 2022; 178:113570. [PMID: 35349864 DOI: 10.1016/j.marpolbul.2022.113570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/04/2022] [Accepted: 03/12/2022] [Indexed: 06/14/2023]
Abstract
Coral reefs across the southern Arabian Gulf have declined in the past two decades, with extensive loss of formerly Acropora table corals, which are now functionally extinct in nearshore reefs. This study documents the coral community at Sir Bu Nair (SBN), an offshore island buffered by less extreme environmental conditions, which contains the last remaining large stands of Acropora in the southern Gulf. We found that Acropora is a major reef-building coral throughout SBN. Mean coral cover was 27% (range: 6%-49%) across all sites and depths, of which more than half was comprised by Acropora. This varied around the island, with the highest densities to the south and southwest in shallow waters. Our study provides essential information for the management and conservation of these highly valuable and vulnerable corals.
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Affiliation(s)
- Ivonne Bejarano
- Department of Biology, Chemistry and Environmental Sciences Department, American University of Sharjah, 26666, Sharjah, United Arab Emirates
| | - Victor Orenes-Salazar
- Departamento de Ecología e Hidrología, Universidad de Murcia, Campus Espinardo, 30100, Murcia, Spain
| | - Rita Bento
- Emirates Nature - World Wide Fund for Nature (Emirates Nature-WWF), P.O. Box 23304, Dubai, United Arab Emirates
| | | | - Daniel Mateos-Molina
- Departamento de Ecología e Hidrología, Universidad de Murcia, Campus Espinardo, 30100, Murcia, Spain; Emirates Nature - World Wide Fund for Nature (Emirates Nature-WWF), P.O. Box 23304, Dubai, United Arab Emirates.
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The coral reef-dwelling Peneroplis spp. shows calcification recovery to ocean acidification conditions. Sci Rep 2022; 12:6373. [PMID: 35430588 PMCID: PMC9013382 DOI: 10.1038/s41598-022-10375-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 04/01/2022] [Indexed: 11/19/2022] Open
Abstract
Large Benthic Foraminifera are a crucial component of coral-reef ecosystems, which are currently threatened by ocean acidification. We conducted culture experiments to evaluate the impact of low pH on survival and test dissolution of the symbiont-bearing species Peneroplis spp., and to observe potential calcification recovery when specimens are placed back under reference pH value (7.9). We found that Peneroplis spp. displayed living activity up to 3 days at pH 6.9 (Ωcal < 1) or up to 1 month at pH 7.4 (Ωcal > 1), despite the dark and unfed conditions. Dissolution features were observed under low Ωcal values, such as changes in test density, peeled extrados layers, and decalcified tests with exposed organic linings. A new calcification phase started when specimens were placed back at reference pH. This calcification’s resumption was an addition of new chambers without reparation of the dissolved parts, which is consistent with the porcelaneous calcification pathway of Peneroplis spp. The most decalcified specimens displayed a strong survival response by adding up to 8 new chambers, and the contribution of food supply in this process was highlighted. These results suggest that porcelaneous LBF species have some recovery abilities to short exposure (e.g., 3 days to 1 month) to acidified conditions. However, the geochemical signature of trace elements in the new calcite was impacted, and the majority of the new chambers were distorted and resulted in abnormal tests, which might hinder the specimens’ reproduction and thus their survival on the long term.
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60
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Boakes Z, Hall AE, Elvan Ampou E, Jones GC, Gusti Ngurah Agung Suryaputra I, Putu Mahyuni L, Prasetyo R, Stafford R. Coral reef conservation in Bali in light of international best practice, a literature review. J Nat Conserv 2022. [DOI: 10.1016/j.jnc.2022.126190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Genetic variation in released gametes produces genetic diversity in the offspring of the broadcast spawning coral Acropora tenuis. Sci Rep 2022; 12:5026. [PMID: 35322111 PMCID: PMC8943061 DOI: 10.1038/s41598-022-08995-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 03/02/2022] [Indexed: 11/23/2022] Open
Abstract
All coral species in the genus Acropora are broadcast-spawning hermaphrodites. Fertilization in the ocean requires sufficient numbers of gametes from conspecifics and the contact time for fertilization is thought to be limited by the rapid diffusion of sperm. Many studies have reported a positive correlation between sperm concentration and fertilization success, but it is not clear how gametes diffuse in seawater to produce mixtures of gametes from many colonies, leading to fertilization that improves genetic diversity. To elucidate this, we analyzed the changes in sperm concentration of A.tenuis in situ after spawning and genotyped sperm and fertilized eggs from seawater using seven microsatellite (MS) markers. Results showed that most of the eggs were fertilized at below 106 sperm/mL in situ. MS genotyping showed that the alleles of released sperm were diverse and those alleles also appeared in the fertilized eggs. The MS fragment peak height in released sperm, which presumably reflects the allele frequency of the sperm, was positively correlated with the allele frequencies of the fertilized eggs. Collectively, synchronous spawning populations composed of highly fecund and genetically diverse colonies potentially increases genetic diversity and the number of descendants.
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62
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Madeira C, Dias M, Ferreira A, Gouveia R, Cabral H, Diniz MS, Vinagre C. Does Predation Exacerbate the Risk of Endosymbiont Loss in Heat Stressed Hermatypic Corals? Molecular Cues Provide Insights Into Species-Specific Health Outcomes in a Multi-Stressor Ocean. Front Physiol 2022; 13:801672. [PMID: 35299660 PMCID: PMC8922028 DOI: 10.3389/fphys.2022.801672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 01/31/2022] [Indexed: 11/30/2022] Open
Abstract
Ocean warming has been a major driver of coral reef bleaching and mass mortality. Coupled to other biotic pressures, corals’ ability for acclimatization and adaptation may become compromised. Here, we tested the combined effects of warming scenarios (26, 30, and 32°C) and predation (wound vs. no wound) in coral health condition (paleness, bleaching, and mortality), cellular stress responses (heat shock protein 70 kDa Hsp70, total ubiquitin Ub, and total antioxidant capacity TAC), and physiological state (integrated biomarker response index, IBR) of seven Scleractinian coral species, after being exposed for 60 days. Results show that although temperature was the main factor driving coral health condition, thermotolerant species (Galaxea fascicularis, Psammocora contigua, and Turbinaria reniformis) displayed increased paleness, bleaching, and mortality in predation treatments at high temperature, whereas thermosensitive species (Acropora tenuis, Echinopora lamellosa, and Montipora capricornis brown and green morphotypes) all died at 32°C, regardless of predation condition. At the molecular level, results show that there were significant main and interactive effects of species, temperature, and predation in the biomarkers assessed. Temperature affected Hsp70, Ub, and TAC, evidencing the role of protein folding and turnover, as well as reactive oxygen species scavenging in heat stress management. Predation increased Hsp70 and Ub, suggesting the activation of the pro-phenoloxidase system and cytokine activity, whereas the combination of both stressors mainly affected TAC during moderate stress and Ub under severe stress, suggesting that redox balance and defense of homeostasis are crucial in tissue repair at high temperature. IBR levels showed an increasing trend at 32°C in predated coral fragments (although non-significant). We conclude that coral responses to the combination of high temperature and predation pressure display high inter-species variability, but these stressors may pose a higher risk of endosymbiont loss, depending on species physiology and stress intensity.
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Affiliation(s)
- Carolina Madeira
- i4HB – Associate Laboratory Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
- UCIBIO – Applied Molecular Biosciences Unit, NOVA School of Science and Technology, NOVA University of Lisbon, Caparica, Portugal
- MARE – Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- *Correspondence: Carolina Madeira, , orcid.org/0000-0003-1632-634X
| | - Marta Dias
- MARE – Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- Marta Dias, , orcid.org/0000-0003-0447-6009
| | - Ana Ferreira
- Biology Department, Oceanário de Lisboa, Lisbon, Portugal
| | - Raúl Gouveia
- Biology Department, Oceanário de Lisboa, Lisbon, Portugal
| | - Henrique Cabral
- MARE – Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- INRAE – National Research Institute for Agriculture, Food and Environment, UR EABX, Cestas, France
| | - Mário S. Diniz
- i4HB – Associate Laboratory Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
- UCIBIO – Applied Molecular Biosciences Unit, NOVA School of Science and Technology, NOVA University of Lisbon, Caparica, Portugal
| | - Catarina Vinagre
- MARE – Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- CCMAR – Centre of Marine Sciences, University of Algarve, Faro, Portugal
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Rim G, Kong F, Song M, Rosu C, Priyadarshini P, Lively RP, Jones CW. Sub-Ambient Temperature Direct Air Capture of CO 2 using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO 2 Recovery. JACS AU 2022; 2:380-393. [PMID: 35252988 PMCID: PMC8889612 DOI: 10.1021/jacsau.1c00414] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Indexed: 05/12/2023]
Abstract
Due to the dramatically increased atmospheric CO2 concentration and consequential climate change, significant effort has been made to develop sorbents to directly capture CO2 from ambient air (direct air capture, DAC) to achieve negative CO2 emissions in the immediate future. However, most developed sorbents have been studied under a limited array of temperature (>20 °C) and humidity conditions. In particular, the dearth of experimental data on DAC at sub-ambient conditions (e.g., -30 to 20 °C) and under humid conditions will severely hinder the large-scale implementation of DAC because the world has annual average temperatures ranging from -30 to 30 °C depending on the location and essentially no place has a zero absolute humidity. To this end, we suggest that understanding CO2 adsorption from ambient air at sub-ambient temperatures, below 20 °C, is crucial because colder temperatures represent important practical operating conditions and because such temperatures may provide conditions where new sorbent materials or enhanced process performance might be achieved. Here we demonstrate that MIL-101(Cr) materials impregnated with amines (TEPA, tetraethylenepentamine, or PEI, poly(ethylenimine)) offer promising adsorption and desorption behavior under DAC conditions in both the presence and absence of humidity under a wide range of temperatures (-20 to 25 °C). Depending on the amine loading and adsorption temperature, the sorbents show different CO2 capture behavior. With 30 and 50 wt % amine loadings, the sorbents show weak and strong chemisorption-dominant CO2 capture behavior, respectively. Interestingly, at -20 °C, the CO2 adsorption capacity of 30 wt % TEPA-impregnated MIL-101(Cr) significantly increased up to 1.12 mmol/g from 0.39 mmol/g at ambient conditions (25 °C) due to the enhanced weak chemisorption. More importantly, the sorbents also show promising working capacities (0.72 mmol/g) over 15 small temperature swing cycles with an ultralow regeneration temperature (-20 °C sorption to 25 °C desorption). The sub-ambient DAC performance of the sorbents is further enhanced under humid conditions, showing promising and stable CO2 working capacities over multiple humid small temperature swing cycles. These results demonstrate that appropriately designed DAC sorbents can operate in a weak chemisorption modality at low temperatures even in the presence of humidity. Significant energy savings may be realized via the utilization of small temperature swings enabled by this weak chemisorption behavior. This work suggests that significant work on DAC materials that operate at low, sub-ambient temperatures is warranted for possible deployment in temperate and polar climates.
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64
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Ziegler M, Anton A, Klein SG, Rädecker N, Geraldi NR, Schmidt-Roach S, Saderne V, Mumby PJ, Cziesielski MJ, Martin C, Frölicher TL, Pandolfi JM, Suggett DJ, Aranda M, Duarte CM, Voolstra CR. Integrating environmental variability to broaden the research on coral responses to future ocean conditions. GLOBAL CHANGE BIOLOGY 2021; 27:5532-5546. [PMID: 34391212 DOI: 10.1111/gcb.15840] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/19/2021] [Accepted: 06/25/2021] [Indexed: 06/13/2023]
Abstract
Our understanding of the response of reef-building corals to changes in their physical environment is largely based on laboratory experiments, analysis of long-term field data, and model projections. Experimental data provide unique insights into how organisms respond to variation of environmental drivers. However, an assessment of how well experimental conditions cover the breadth of environmental conditions and variability where corals live successfully is missing. Here, we compiled and analyzed a globally distributed dataset of in-situ seasonal and diurnal variability of key environmental drivers (temperature, pCO2 , and O2 ) critical for the growth and livelihood of reef-building corals. Using a meta-analysis approach, we compared the variability of environmental conditions assayed in coral experimental studies to current and projected conditions in their natural habitats. We found that annual temperature profiles projected for the end of the 21st century were characterized by distributional shifts in temperatures with warmer winters and longer warm periods in the summer, not just peak temperatures. Furthermore, short-term hourly fluctuations of temperature and pCO2 may regularly expose corals to conditions beyond the projected average increases for the end of the 21st century. Coral reef sites varied in the degree of coupling between temperature, pCO2 , and dissolved O2 , which warrants site-specific, differentiated experimental approaches depending on the local hydrography and influence of biological processes on the carbonate system and O2 availability. Our analysis highlights that a large portion of the natural environmental variability at short and long timescales is underexplored in experimental designs, which may provide a path to extend our understanding on the response of corals to global climate change.
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Affiliation(s)
- Maren Ziegler
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Giessen, Germany
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Andrea Anton
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Global Change Research Group, IMEDEA (CSIC-UIB), Mediterranean Institute for Advanced Studies, Esporles (Illes Balears), Spain
| | - Shannon G Klein
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Nils Rädecker
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Department of Biology, University of Konstanz, Konstanz, Germany
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Nathan R Geraldi
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Sebastian Schmidt-Roach
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Vincent Saderne
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Peter J Mumby
- Marine Spatial Ecology Lab, School of Biological Sciences, The University of Queensland, St. Lucia, Qld, Australia
| | - Maha J Cziesielski
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Cecilia Martin
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Thomas L Frölicher
- Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
- Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
| | - John M Pandolfi
- Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, The University of Queensland, Brisbane, Qld, Australia
| | - David J Suggett
- Climate Change Cluster, Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia
| | - Manuel Aranda
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Carlos M Duarte
- Red Sea Research Center (RSRC) and Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Christian R Voolstra
- Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
- Department of Biology, University of Konstanz, Konstanz, Germany
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Bairos-Novak KR, Hoogenboom MO, van Oppen MJH, Connolly SR. Coral adaptation to climate change: Meta-analysis reveals high heritability across multiple traits. GLOBAL CHANGE BIOLOGY 2021; 27:5694-5710. [PMID: 34482591 DOI: 10.1111/gcb.15829] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/23/2021] [Accepted: 07/25/2021] [Indexed: 06/13/2023]
Abstract
Anthropogenic climate change is a rapidly intensifying selection pressure on biodiversity across the globe and, particularly, on the world's coral reefs. The rate of adaptation to climate change is proportional to the amount of phenotypic variation that can be inherited by subsequent generations (i.e., narrow-sense heritability, h2 ). Thus, traits that have higher heritability (e.g., h2 > 0.5) are likely to adapt to future conditions faster than traits with lower heritability (e.g., h2 < 0.1). Here, we synthesize 95 heritability estimates across 19 species of reef-building corals. Our meta-analysis reveals low heritability (h2 < 0.25) of gene expression metrics, intermediate heritability (h2 = 0.25-0.50) of photochemistry, growth, and bleaching, and high heritability (h2 > 0.50) for metrics related to survival and immune responses. Some of these values are higher than typically observed in other taxa, such as survival and growth, while others were more comparable, such as gene expression and photochemistry. There was no detectable effect of temperature on heritability, but narrow-sense heritability estimates were generally lower than broad-sense estimates, indicative of significant non-additive genetic variation across traits. Trait heritability also varied depending on coral life stage, with bleaching and growth in juveniles generally having lower heritability compared to bleaching and growth in larvae and adults. These differences may be the result of previous stabilizing selection on juveniles or may be due to constrained evolution resulting from genetic trade-offs or genetic correlations between growth and thermotolerance. While we find no evidence that heritability decreases under temperature stress, explicit tests of the heritability of thermal tolerance itself-such as coral thermal reaction norm shape-are lacking. Nevertheless, our findings overall reveal high trait heritability for the majority of coral traits, suggesting corals may have a greater potential to adapt to climate change than has been assumed in recent evolutionary models.
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Affiliation(s)
- Kevin R Bairos-Novak
- College of Science and Engineering and ARCCOE for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
| | - Mia O Hoogenboom
- College of Science and Engineering and ARCCOE for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
| | - Madeleine J H van Oppen
- Australian Institute of Marine Science, Townsville, Queensland, Australia
- School of BioSciences, University of Melbourne, Melbourne, Victoria, Australia
| | - Sean R Connolly
- College of Science and Engineering and ARCCOE for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
- Smithsonian Tropical Research Institute, Panama City, Panama
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66
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Abstract
AbstractThe frequency, intensity, and duration of periods of extreme environmental warming are expected to rise over the next hundred years and play an increasing role in species loss resulting from climate change, and yet we know little about their potential future effects on variability in the composition of communities. This study analyzed patterns of species loss in a community of four rotifers and six ciliates exposed to different rates of extreme warming. Temperature of loss was positively correlated with warming rates for all species, consistent with theoretical frameworks suggesting that lower rates of warming increase exposure time and cumulative thermal stress at each temperature. The sequence of species loss during extreme warming depended on the environmental warming rate (i.e., warming rates had the capacity to drive reversals in the relative thermal tolerances of species), and changes in the sequence of species loss driven by the warming rate resulted in substantial variability in community composition. The results suggest that differences in warming rates across space and time may increase variability in community composition in ecosystems increasingly disturbed by extreme temperature, potentially altering interspecific interactions, the abiotic environment, and ecosystem function. Several ecological mechanisms may be responsible, singly or together, for changes in the sequence of species loss at different rates of warming, including (a) differences among species in their sensitivity to the intensity and duration of heat exposure, (b) the effects of warming rates on temperature-dependent interspecific interactions, and (c) differences in opportunities for evolution among species and across warming rates.
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67
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Diot-Néant F, Mouterde L, Couvreur J, Brunois F, Miller S, Allais F. Green synthesis of 2-deoxy-D-ribonolactone from cellulose-derived levoglucosenone (LGO): A promising monomer for novel bio-based polyesters. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110745] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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68
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Scucchia F, Malik A, Putnam HM, Mass T. Genetic and physiological traits conferring tolerance to ocean acidification in mesophotic corals. GLOBAL CHANGE BIOLOGY 2021; 27:5276-5294. [PMID: 34310005 DOI: 10.1111/gcb.15812] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 07/15/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
The integrity of coral reefs worldwide is jeopardized by ocean acidification (OA). Most studies conducted so far have focused on the vulnerability to OA of corals inhabiting shallow reefs while nothing is currently known about the response of mesophotic scleractinian corals. In this study, we assessed the susceptibility to OA of corals, together with their algal partners, inhabiting a wide depth range. We exposed fragments of the depth generalist coral Stylophora pistillata collected from either 5 or 45 m to simulated future OA conditions, and assessed key molecular, physiological and photosynthetic processes influenced by the lowered pH. Our comparative analysis reveals that mesophotic and shallow S. pistillata corals are genetically distinct and possess different symbiont types. Under the exposure to acidification conditions, we observed a 50% drop of metabolic rate in shallow corals, whereas mesophotic corals were able to maintain unaltered metabolic rates. Overall, our gene expression and physiological analyses show that mesophotic corals possess a greater capacity to cope with the effects of OA compared to their shallow counterparts. Such capability stems from physiological characteristics (i.e., biomass and lipids energetics), a greater capacity to regulate cellular acid-base parameters, and a higher baseline expression of cell adhesion and extracellular matrix genes. Moreover, our gene expression analysis suggests that the enhanced symbiont photochemical efficiency under high pCO2 levels could prevent acidosis of the host cells and it could support a greater translocation of photosynthates, increasing the energy pool available to the host. With this work, we provide new insights on the response to OA of corals living at mesophotic depths. Our investigation discloses key genetic and physiological traits underlying the potential for corals to cope with future OA conditions.
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Affiliation(s)
- Federica Scucchia
- Department of Marine Biology, Leon H. Charney school of Marine Sciences, University of Haifa, Haifa, Israel
- The Interuniversity Institute of Marine Sciences, Eilat, Israel
| | - Assaf Malik
- Department of Marine Biology, Leon H. Charney school of Marine Sciences, University of Haifa, Haifa, Israel
| | - Hollie M Putnam
- Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island, USA
| | - Tali Mass
- Department of Marine Biology, Leon H. Charney school of Marine Sciences, University of Haifa, Haifa, Israel
- Morris Kahn Marine Research Station, The Leon H. Charney School of Marine Sciences, University of Haifa, Sdot Yam, Israel
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Hazraty-Kari S, Tavakoli-Kolour P, Das RR, Farhadi M, Barkhordari-Ahmadi A, Yahyavi M, Rezai H. Baseline assessment of coral diseases in an environmentally extreme environment of the northern Persian Gulf. MARINE POLLUTION BULLETIN 2021; 171:112707. [PMID: 34246931 DOI: 10.1016/j.marpolbul.2021.112707] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/27/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
The coral diseases are recognized as serious threats to coral reef ecosystems and a major contributor to the reduction of zooxanthellate scleractinian populations worldwide. Quantitative disease surveys can provide important information on the status and trends of coral reef health over the time. In this study, coral disease surveys were carried out during August 2014 and 2015 at designated sites located in the northern Persian Gulf. Seven different diseases affecting eight scleractinian genera were documented: Black Band Disease (BBD), Skeletal Growth Anomaly (SGA), Arabian Yellow Band Disease (AYBD), White Mat Disease (WMD), White Syndrome (WS), Porites Pink Spot (PPS), and Porites Bleached Patches (PBP). Additionally, it should be noted that this is the first report of SGA in Acropora sp. found in the Persian Gulf. The results of this study generated a baseline dataset of various related diseases in the northern Persian Gulf which can be utilized for future studies.
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Affiliation(s)
- Sanaz Hazraty-Kari
- Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa, Japan.
| | - Parviz Tavakoli-Kolour
- Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa, Japan.
| | - Rocktim Ramen Das
- Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa, Japan
| | - Mina Farhadi
- Faculty of Marine Biology, Lahijan Branch, Islamic Azad University, Lahijan, Iran
| | | | - Maziar Yahyavi
- Department of Fisheries, Bandar Abbas Branch, Islamic Azad University, Bandar abbas, Iran
| | - Hamid Rezai
- Darya Negar Pars Consulting Engineers, Tehran, Iran
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70
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Hoadley KD, Pettay DT, Lewis A, Wham D, Grasso C, Smith R, Kemp DW, LaJeunesse T, Warner ME. Different functional traits among closely related algal symbionts dictate stress endurance for vital Indo-Pacific reef-building corals. GLOBAL CHANGE BIOLOGY 2021; 27:5295-5309. [PMID: 34255912 PMCID: PMC9291761 DOI: 10.1111/gcb.15799] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 06/29/2021] [Accepted: 06/29/2021] [Indexed: 05/24/2023]
Abstract
Reef-building corals in the genus Porites are one of the most important constituents of Indo-Pacific reefs. Many species within this genus tolerate abnormally warm water and exhibit high specificity for particular kinds of endosymbiotic dinoflagellates that cope with thermal stress better than those living in other corals. Still, during extreme ocean heating, some Porites exhibit differences in their stress tolerance. While corals have different physiological qualities, it remains unknown whether the stability and performance of these mutualisms is influenced by the physiology and genetic relatedness of their symbionts. We investigated two ubiquitous Pacific reef corals, Porites rus and Porites cylindrica, from warmer inshore and cooler offshore reef systems in Palau. While these corals harbored a similar kind of symbiont in the genus Cladocopium (within the ITS2 C15 subclade), rapidly evolving genetic markers revealed evolutionarily diverged lineages corresponding to each Porites species living in each reef habitat. Furthermore, these closely related Cladocopium lineages were differentiated by their densities in host tissues, cell volume, chlorophyll concentration, gross photosynthesis, and photoprotective pathways. When assessed using several physiological proxies, these previously undifferentiated symbionts contrasted in their tolerance to thermal stress. Symbionts within P. cylindrica were relatively unaffected by exposure to 32℃ for 14 days, whereas P. rus colonies lost substantial numbers of photochemically compromised symbionts. Heating reduced the ability of the offshore symbiont associated with P. rus to translocate carbon to the coral. By contrast, high temperatures enhanced symbiont carbon assimilation and delivery to the coral skeleton of inshore P. cylindrica. This study indicates that large physiological differences exist even among closely related symbionts, with significant implications for thermal susceptibility among reef-building Porites.
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Affiliation(s)
- Kenneth D. Hoadley
- School of Marine Science and PolicyUniversity of DelawareLewesUK
- Biological SciencesUniversity of AlabamaTuscaloosaAlabamaUSA
- Dauphin Island Sea LabDauphin IslandAlabamaUSA
| | - Daniel. T. Pettay
- School of Marine Science and PolicyUniversity of DelawareLewesUK
- Present address:
University of South CarolinaBeaufortSouth CarolinaUSA
| | - Allison Lewis
- Department of BiologyPennsylvania State Institutes of Energy and the EnvironmentUniversity ParkPennsylvaniaUSA
- Present address:
National Science FoundationSilver SpringsMarylandUSA
| | - Drew Wham
- Department of BiologyPennsylvania State Institutes of Energy and the EnvironmentUniversity ParkPennsylvaniaUSA
| | - Chris Grasso
- School of Marine Science and PolicyUniversity of DelawareLewesUK
| | - Robin Smith
- Science Under SailWellington ParkQLDAustralia
- Present address:
The Nature ConservancySt. CroixUS Virgin IslandsUSA
| | - Dustin W. Kemp
- Department of BiologyUniversity of AlabamaBirminghamAlabamaUSA
| | - Todd LaJeunesse
- Department of BiologyPennsylvania State Institutes of Energy and the EnvironmentUniversity ParkPennsylvaniaUSA
| | - Mark E. Warner
- School of Marine Science and PolicyUniversity of DelawareLewesUK
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Biodiversity of coral reef cryptobiota shuffles but does not decline under the combined stressors of ocean warming and acidification. Proc Natl Acad Sci U S A 2021; 118:2103275118. [PMID: 34544862 PMCID: PMC8488634 DOI: 10.1073/pnas.2103275118] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2021] [Indexed: 12/31/2022] Open
Abstract
Ocean-warming and acidification are predicted to reduce coral reef biodiversity, but the combined effects of these stressors on overall biodiversity are largely unmeasured. Here, we examined the individual and combined effects of elevated temperature (+2 °C) and reduced pH (-0.2 units) on the biodiversity of coral reef communities that developed on standardized sampling units over a 2-y mesocosm experiment. Biodiversity and species composition were measured using amplicon sequencing libraries targeting the cytochrome oxidase I (COI) barcoding gene. Ocean-warming significantly increased species richness relative to present-day control conditions, whereas acidification significantly reduced richness. Contrary to expectations, species richness in the combined future ocean treatment with both warming and acidification was not significantly different from the present-day control treatment. Rather than the predicted collapse of biodiversity under the dual stressors, we find significant changes in the relative abundance but not in the occurrence of species, resulting in a shuffling of coral reef community structure among the highly species-rich cryptobenthic community. The ultimate outcome of altered community structure for coral reef ecosystems will depend on species-specific ecological functions and community interactions. Given that most species on coral reefs are members of the understudied cryptobenthos, holistic research on reef communities is needed to accurately predict diversity-function relationships and ecosystem responses to future climate conditions.
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72
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Yang F, Wei Z, Long L. Transcriptomic and Physiological Responses of the Tropical Reef Calcified Macroalga Amphiroa fragilissima to Elevated Temperature 1. JOURNAL OF PHYCOLOGY 2021; 57:1254-1265. [PMID: 33655511 DOI: 10.1111/jpy.13158] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Calcareous macroalgae are of particular ecological importance as primary producers, carbonate sediment builders, and habitat providers in coral reef ecosystems. Ocean warming is a major threat to calcareous algae, but it remains unclear exactly how these algae will respond to it. In this study, the potential physiological impacts of ocean warming on the calcareous alga Amphiroa fragilissima were evaluated in laboratory experiments. Increasing temperature from 26 to 28°C had positive effects on algal growth rate and chlorophyll a content, but these parameters decreased significantly at 32°C, which is 5°C above the annual mean temperature in the study region. Algal bleaching occurred at 34°C. There were no significant differences in CaCO3 content of thalli among different temperatures; however, calcification rate was inhibited significantly at 32 and 34°C. Transcriptome analyses using the Illumina RNA-seq platform showed that differentially expressed genes were annotated mainly in the categories of steroid biosynthesis, gap junction, ribosome, and mTOR signaling pathway. The expression levels of PsbA and PsbP were suppressed at 32°C, implying that inactivation of photosystem II could be a main reason for the decreased photosynthetic rate. Down-regulation of the genes encoding carbonic anhydrase and nitrate reductase was observed at 32°C, which could inhibit growth rate. Additionally, several genes that might be related to calcification were identified, including CAMK, CDPK, and CAM and genes encoding alpha-catenin and carbonic anhydrase. This study contributes to our understanding of the effects of temperature on algal calcification and provides a theoretical basis to protect ecological diversity of coral reef ecosystems.
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Affiliation(s)
- Fangfang Yang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Inonovation Academy of South China Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China
| | - Zhangliang Wei
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Inonovation Academy of South China Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China
| | - Lijuan Long
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
- Inonovation Academy of South China Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China
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Johnson MD, Scott JJ, Leray M, Lucey N, Bravo LMR, Wied WL, Altieri AH. Rapid ecosystem-scale consequences of acute deoxygenation on a Caribbean coral reef. Nat Commun 2021; 12:4522. [PMID: 34312399 PMCID: PMC8313580 DOI: 10.1038/s41467-021-24777-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 06/30/2021] [Indexed: 02/07/2023] Open
Abstract
Loss of oxygen in the global ocean is accelerating due to climate change and eutrophication, but how acute deoxygenation events affect tropical marine ecosystems remains poorly understood. Here we integrate analyses of coral reef benthic communities with microbial community sequencing to show how a deoxygenation event rapidly altered benthic community composition and microbial assemblages in a shallow tropical reef ecosystem. Conditions associated with the event precipitated coral bleaching and mass mortality, causing a 50% loss of live coral and a shift in the benthic community that persisted a year later. Conversely, the unique taxonomic and functional profile of hypoxia-associated microbes rapidly reverted to a normoxic assemblage one month after the event. The decoupling of ecological trajectories among these major functional groups following an acute event emphasizes the need to incorporate deoxygenation as an emerging stressor into coral reef research and management plans to combat escalating threats to reef persistence.
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Affiliation(s)
- Maggie D Johnson
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama.
- Tennenbaum Marine Observatories Network, MarineGEO, Smithsonian Institution, Edgewater, MD, USA.
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
| | - Jarrod J Scott
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Matthieu Leray
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Noelle Lucey
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Lucia M Rodriguez Bravo
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
- Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Ensenada, Mexico
| | - William L Wied
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
- Department of Biological Sciences, Center for Coastal Oceans Research, Florida International University, Miami, FL, USA
| | - Andrew H Altieri
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
- Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL, USA
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74
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Herrera M, Liew YJ, Venn A, Tambutté E, Zoccola D, Tambutté S, Cui G, Aranda M. New Insights From Transcriptomic Data Reveal Differential Effects of CO 2 Acidification Stress on Photosynthesis of an Endosymbiotic Dinoflagellate in hospite. Front Microbiol 2021; 12:666510. [PMID: 34349734 PMCID: PMC8326563 DOI: 10.3389/fmicb.2021.666510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 06/15/2021] [Indexed: 01/22/2023] Open
Abstract
Ocean acidification (OA) has both detrimental as well as beneficial effects on marine life; it negatively affects calcifiers while enhancing the productivity of photosynthetic organisms. To date, many studies have focused on the impacts of OA on calcification in reef-building corals, a process particularly susceptible to acidification. However, little is known about the effects of OA on their photosynthetic algal partners, with some studies suggesting potential benefits for symbiont productivity. Here, we investigated the transcriptomic response of the endosymbiont Symbiodinium microadriaticum (CCMP2467) in the Red Sea coral Stylophora pistillata subjected to different long-term (2 years) OA treatments (pH 8.0, 7.8, 7.4, 7.2). Transcriptomic analyses revealed that symbionts from corals under lower pH treatments responded to acidification by increasing the expression of genes related to photosynthesis and carbon-concentrating mechanisms. These processes were mostly up-regulated and associated metabolic pathways were significantly enriched, suggesting an overall positive effect of OA on the expression of photosynthesis-related genes. To test this conclusion on a physiological level, we analyzed the symbiont’s photochemical performance across treatments. However, in contrast to the beneficial effects suggested by the observed gene expression changes, we found significant impairment of photosynthesis with increasing pCO2. Collectively, our data suggest that over-expression of photosynthesis-related genes is not a beneficial effect of OA but rather an acclimation response of the holobiont to different water chemistries. Our study highlights the complex effects of ocean acidification on these symbiotic organisms and the role of the host in determining symbiont productivity and performance.
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Affiliation(s)
- Marcela Herrera
- Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Yi Jin Liew
- Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Alexander Venn
- Marine Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Eric Tambutté
- Marine Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Didier Zoccola
- Marine Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Sylvie Tambutté
- Marine Department, Centre Scientifique de Monaco, Monaco, Monaco
| | - Guoxin Cui
- Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Manuel Aranda
- Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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75
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Gouezo M, Fabricius K, Harrison P, Golbuu Y, Doropoulos C. Optimizing coral reef recovery with context-specific management actions at prioritized reefs. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 295:113209. [PMID: 34346392 DOI: 10.1016/j.jenvman.2021.113209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/06/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Assisting the natural recovery of coral reefs through local management actions is needed in response to increasing ecosystem disturbances in the Anthropocene. There is growing evidence that commonly used resilience-based passive management approaches may not be sufficient to maintain coral reef key functions. We synthesize and discuss advances in coral reef recovery research, and its application to coral reef conservation and restoration practices. We then present a framework to guide the decision-making of reef managers, scientists and other stakeholders, to best support reef recovery after a disturbance. The overall aim of this management framework is to catalyse reef recovery, to minimize recovery times, and to limit the need for ongoing management interventions into the future. Our framework includes two main stages: first, a prioritization method for assessment following a large-scale disturbance, which is based on a reef's social-ecological values, and on a classification of the likelihood of recovery or succession resulting in degraded, novel, hybrid or historical states. Second, a flow chart to assist with determining management actions for highly valued reefs. Potential actions are chosen based on the ecological attributes of the disturbed reef, defined during ecological assessments. Depending on the context, management actions may include (1) substrata rehabilitation actions to facilitate natural coral recruitment, (2) repopulating actions using active restoration techniques, (3) resilience-based management actions and (4) monitoring coral recruitment and growth to assess the effectiveness of management interventions. We illustrate the proposed decision framework with a case study of typhoon-damaged eastern outer reefs in Palau, Micronesia. The decisions made following this framework lead to the conclusion that some reefs may not return to their historical state for many decades. However, if motivation and funds are available, new management approaches can be explored to assist coral reefs at valued locations to return to a functional state providing key ecosystem services.
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Affiliation(s)
- Marine Gouezo
- Palau International Coral Reef Center, PO Box 7086, Koror, Palau; Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia.
| | - Katharina Fabricius
- Australian Institute of Marine Science, PMB 3, Townsville, QLD 4810, Australia.
| | - Peter Harrison
- Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia.
| | - Yimnang Golbuu
- Palau International Coral Reef Center, PO Box 7086, Koror, Palau.
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76
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El-Khaled YC, Nafeh R, Roth F, Rädecker N, Karcher DB, Jones BH, Voolstra CR, Wild C. High plasticity of nitrogen fixation and denitrification of common coral reef substrates in response to nitrate availability. MARINE POLLUTION BULLETIN 2021; 168:112430. [PMID: 34000709 DOI: 10.1016/j.marpolbul.2021.112430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
Nitrogen cycling in coral reefs may be affected by nutrient availability, but knowledge about concentration-dependent thresholds that modulate dinitrogen fixation and denitrification is missing. We determined the effects of different nitrate concentrations (ambient, 1, 5, 10 μM nitrate addition) on both processes under two light scenarios (i.e., light and dark) using a combined acetylene assay for two common benthic reef substrates, i.e., turf algae and coral rubble. For both substrates, dinitrogen fixation rates peaked at 5 μM nitrate addition in light, whereas denitrification was highest at 10 μM nitrate addition in the dark. At 10 μm nitrate addition in the dark, a near-complete collapse of dinitrogen fixation concurrent with a 76-fold increase in denitrification observed for coral rubble, suggesting potential threshold responses linked to the nutritional state of the community. We conclude that dynamic nitrogen cycling activity may help stabilise nitrogen availability in microbial communities associated with coral reef substrates.
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Affiliation(s)
- Yusuf C El-Khaled
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359 Bremen, Germany.
| | - Rassil Nafeh
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359 Bremen, Germany
| | - Florian Roth
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), 23995 Thuwal, Saudi Arabia; Baltic Sea Centre, Stockholm University, 10691 Stockholm, Sweden; Faculty of Biological and Environmental Sciences, Tvärminne Zoological Station, University of Helsinki, 00014 Helsinki, Finland
| | - Nils Rädecker
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), 23995 Thuwal, Saudi Arabia; Department of Biology, University of Konstanz, 78457 Konstanz, Germany; Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Denis B Karcher
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359 Bremen, Germany; Australian National Centre for the Public Awareness of Science, Australian National University, ACT 2601 Canberra, Australia
| | - Burton H Jones
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), 23995 Thuwal, Saudi Arabia
| | - Christian R Voolstra
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), 23995 Thuwal, Saudi Arabia; Department of Biology, University of Konstanz, 78457 Konstanz, Germany
| | - Christian Wild
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359 Bremen, Germany
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77
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Zhang R, Han M, Yu K, Kang Y, Wang Y, Huang X, Li J, Yang Y. Distribution, fate and sources of polycyclic aromatic hydrocarbons (PAHs) in atmosphere and surface water of multiple coral reef regions from the South China Sea: A case study in spring-summer. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125214. [PMID: 33529835 DOI: 10.1016/j.jhazmat.2021.125214] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
Our previous study revealed PAHs' wide occurrence in corals from multiple coral reef regions (CRRs) in the South China Sea. However, little is known about their occurrence, distribution, fate, and sources in the ambient environment of these CRRs. This study aimed to resolve these research gaps. The results showed ∑15PAHs (total concentrations of 15 US EPA priority controlled PAHs exclude naphthalene) in the atmosphere (gas-phase: 0.31-49.6 ng m-3; particle-phase: 2.6-649 pg m-3) were mainly influenced by air mass origins. Southwesterly wind caused higher ∑15PAHs than the southeasterly wind. The ∑15PAHs in seawater from the nearshore (462 ± 244 ng L-1) was higher than that from offshore Zhongsha Islands (80.5 ± 72.1 ng L-1) because of the effect of terrigenous pollution and ocean current. Source apportionment indicated that the mixed sources of spilled oil and combustion from neighboring countries were the main contributors to PAHs in these CRRs. The total deposition fluxes showed that PAHs tended to migrate from the atmosphere to seawater. Global warming may inhibit this process, but PAHs still have a migration pattern of atmosphere-ocean-corals, which will further increase the environmental pressure on coral reef ecology.
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Affiliation(s)
- Ruijie Zhang
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China.
| | - Minwei Han
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China
| | - Kefu Yu
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China.
| | - Yaru Kang
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China
| | - Yinghui Wang
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China
| | - Xueyong Huang
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea; Coral Reef Research Center of China; School of Marine Sciences, Guangxi University, Nanning 530004, China
| | - Jun Li
- Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Ying Yang
- School of Marine Sciences, SunYat-SenUniversity, Guangzhou 510006, China
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78
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Dellisanti W, Chung JTH, Chow CFY, Wu J, Wells ML, Chan LL. Experimental Techniques to Assess Coral Physiology in situ Under Global and Local Stressors: Current Approaches and Novel Insights. Front Physiol 2021; 12:656562. [PMID: 34163371 PMCID: PMC8215126 DOI: 10.3389/fphys.2021.656562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 04/09/2021] [Indexed: 11/19/2022] Open
Abstract
Coral reefs are declining worldwide due to global changes in the marine environment. The increasing frequency of massive bleaching events in the tropics is highlighting the need to better understand the stages of coral physiological responses to extreme conditions. Moreover, like many other coastal regions, coral reef ecosystems are facing additional localized anthropogenic stressors such as nutrient loading, increased turbidity, and coastal development. Different strategies have been developed to measure the health status of a damaged reef, ranging from the resolution of individual polyps to the entire coral community, but techniques for measuring coral physiology in situ are not yet widely implemented. For instance, while there are many studies of the coral holobiont response in single or limited-number multiple stressor experiments, they provide only partial insights into metabolic performance under more complex and temporally and spatially variable natural conditions. Here, we discuss the current status of coral reefs and their global and local stressors in the context of experimental techniques that measure core processes in coral metabolism (respiration, photosynthesis, and biocalcification) in situ, and their role in indicating the health status of colonies and communities. We highlight the need to improve the capability of in situ studies in order to better understand the resilience and stress response of corals under multiple global and local scale stressors.
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Affiliation(s)
- Walter Dellisanti
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, China.,Department of Biomedical Sciences, City University of Hong Kong, Kowloon, China
| | - Jeffery T H Chung
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, China
| | - Cher F Y Chow
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, China.,Centre for Biological Diversity, Scottish Oceans Institute, School of Biology, University of St Andrews, St Andrews, United Kingdom
| | - Jiajun Wu
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, China
| | - Mark L Wells
- School of Marine Sciences, University of Maine, Orono, ME, United States.,State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
| | - Leo L Chan
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, China.,Department of Biomedical Sciences, City University of Hong Kong, Kowloon, China.,Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China
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79
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El-Khaled YC, Roth F, Rädecker N, Tilstra A, Karcher DB, Kürten B, Jones BH, Voolstra CR, Wild C. Nitrogen fixation and denitrification activity differ between coral- and algae-dominated Red Sea reefs. Sci Rep 2021; 11:11820. [PMID: 34083565 PMCID: PMC8175748 DOI: 10.1038/s41598-021-90204-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 05/07/2021] [Indexed: 11/18/2022] Open
Abstract
Coral reefs experience phase shifts from coral- to algae-dominated benthic communities, which could affect the interplay between processes introducing and removing bioavailable nitrogen. However, the magnitude of such processes, i.e., dinitrogen (N2) fixation and denitrification levels, and their responses to phase shifts remain unknown in coral reefs. We assessed both processes for the dominant species of six benthic categories (hard corals, soft corals, turf algae, coral rubble, biogenic rock, and reef sands) accounting for > 98% of the benthic cover of a central Red Sea coral reef. Rates were extrapolated to the relative benthic cover of the studied organisms in co-occurring coral- and algae-dominated areas of the same reef. In general, benthic categories with high N2 fixation exhibited low denitrification activity. Extrapolated to the respective reef area, turf algae and coral rubble accounted for > 90% of overall N2 fixation, whereas corals contributed to more than half of reef denitrification. Total N2 fixation was twice as high in algae- compared to coral-dominated areas, whereas denitrification levels were similar. We conclude that algae-dominated reefs promote new nitrogen input through enhanced N2 fixation and comparatively low denitrification. The subsequent increased nitrogen availability could support net productivity, resulting in a positive feedback loop that increases the competitive advantage of algae over corals in reefs that experienced a phase shift.
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Affiliation(s)
- Yusuf C El-Khaled
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359, Bremen, Germany.
| | - Florian Roth
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23995, Saudi Arabia
- Baltic Sea Centre, Stockholm University, 10691, Stockholm, Sweden
- Faculty of Biological and Environmental Sciences, Tvärminne Zoological Station, University of Helsinki, 00014, Helsinki, Finland
| | - Nils Rädecker
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23995, Saudi Arabia
- Department of Biology, University of Konstanz, 78457, Konstanz, Germany
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Arjen Tilstra
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359, Bremen, Germany
| | - Denis B Karcher
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359, Bremen, Germany
- Australian National Centre for the Public Awareness of Science, Australian National University, ACT, Canberra, 2601, Australia
| | - Benjamin Kürten
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23995, Saudi Arabia
- Project Management Jülich, Jülich Research Centre GmbH, 18069, Rostock, Germany
| | - Burton H Jones
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23995, Saudi Arabia
| | - Christian R Voolstra
- Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23995, Saudi Arabia
- Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | - Christian Wild
- Marine Ecology Department, Faculty of Biology and Chemistry, University of Bremen, 28359, Bremen, Germany
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80
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Laffoley D, Baxter J, Amon D, Claudet J, Hall‐Spencer J, Grorud‐Colvert K, Levin L, Reid P, Rogers A, Taylor M, Woodall L, Andersen N. Evolving the narrative for protecting a rapidly changing ocean, post-COVID-19. AQUATIC CONSERVATION : MARINE AND FRESHWATER ECOSYSTEMS 2021; 31:1512-1534. [PMID: 33362396 PMCID: PMC7753556 DOI: 10.1002/aqc.3512] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 05/02/2023]
Abstract
The ocean is the linchpin supporting life on Earth, but it is in declining health due to an increasing footprint of human use and climate change. Despite notable successes in helping to protect the ocean, the scale of actions is simply not now meeting the overriding scale and nature of the ocean's problems that confront us.Moving into a post-COVID-19 world, new policy decisions will need to be made. Some, especially those developed prior to the pandemic, will require changes to their trajectories; others will emerge as a response to this global event. Reconnecting with nature, and specifically with the ocean, will take more than good intent and wishful thinking. Words, and how we express our connection to the ocean, clearly matter now more than ever before.The evolution of the ocean narrative, aimed at preserving and expanding options and opportunities for future generations and a healthier planet, is articulated around six themes: (1) all life is dependent on the ocean; (2) by harming the ocean, we harm ourselves; (3) by protecting the ocean, we protect ourselves; (4) humans, the ocean, biodiversity, and climate are inextricably linked; (5) ocean and climate action must be undertaken together; and (6) reversing ocean change needs action now.This narrative adopts a 'One Health' approach to protecting the ocean, addressing the whole Earth ocean system for better and more equitable social, cultural, economic, and environmental outcomes at its core. Speaking with one voice through a narrative that captures the latest science, concerns, and linkages to humanity is a precondition to action, by elevating humankind's understanding of our relationship with 'planet Ocean' and why it needs to become a central theme to everyone's lives. We have only one ocean, we must protect it, now. There is no 'Ocean B'.
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Affiliation(s)
- D. Laffoley
- IUCN World Commission on Protected AreasIUCN (International Union for Conservation of Nature)GlandSwitzerland
| | - J.M. Baxter
- Marine Alliance for Science and Technology for Scotland, School of Biology, East SandsUniversity of St AndrewsSt AndrewsUK
| | - D.J. Amon
- Department of Life SciencesNatural History MuseumLondonUK
| | - J. Claudet
- National Centre for Scientific ResearchPSL Université Paris, CRIOBE, USR 3278 CNRS‐EPHE‐UPVDParisFrance
| | - J.M. Hall‐Spencer
- School of Marine and Biological SciencesUniversity of PlymouthPlymouthUK
- Shimoda Marine Research CenterUniversity of TsukubaShimodaJapan
| | - K. Grorud‐Colvert
- Department of Integrative BiologyOregon State UniversityCorvallisUSA
| | - L.A. Levin
- Center for Marine Biodiversity and Conservation, Scripps Institution of OceanographyUniversity of California San DiegoLa JollaUSA
| | - P.C. Reid
- School of Marine and Biological SciencesUniversity of PlymouthPlymouthUK
- The LaboratoryThe Continuous Plankton Recorder Survey, Marine Biological AssociationCitadel HillPlymouthUK
| | - A.D. Rogers
- Somerville CollegeUniversity of OxfordOxfordUK
- REV OceanLysakerNorway
| | | | - L.C. Woodall
- Department of ZoologyUniversity of OxfordOxfordUK
| | - N.F. Andersen
- Department of Environment and GeographyUniversity of YorkYorkUK
- Centre for Ecology and ConservationUniversity of ExeterPenrynUK
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81
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Potential local adaptation of corals at acidified and warmed Nikko Bay, Palau. Sci Rep 2021; 11:11192. [PMID: 34045589 PMCID: PMC8159998 DOI: 10.1038/s41598-021-90614-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 05/12/2021] [Indexed: 02/04/2023] Open
Abstract
Ocean warming and acidification caused by increases of atmospheric carbon dioxide are now thought to be major threats to coral reefs on a global scale. Here we evaluated the environmental conditions and benthic community structures in semi-closed Nikko Bay at the inner reef area in Palau, which has high pCO2 and seawater temperature conditions with high zooxanthellate coral coverage. Nikko Bay is a highly sheltered system with organisms showing low connectivity with surrounding environments, making this bay a unique site for evaluating adaptation and acclimatization responses of organisms to warmed and acidified environments. Seawater pCO2/Ωarag showed strong gradation ranging from 380 to 982 µatm (Ωarag: 1.79-3.66), and benthic coverage, including soft corals and turf algae, changed along with Ωarag while hard coral coverage did not change. In contrast to previous studies, net calcification was maintained in Nikko Bay even under very low mean Ωarag (2.44). Reciprocal transplantation of the dominant coral Porites cylindrica showed that the calcification rate of corals from Nikko Bay did not change when transplanted to a reference site, while calcification of reference site corals decreased when transplanted to Nikko Bay. Corals transplanted out of their origin sites also showed the highest interactive respiration (R) and lower gross photosynthesis (Pg) to respiration (Pg:R), indicating higher energy acquirement of corals at their origin site. The results of this study give important insights about the potential local acclimatization and adaptation capacity of corals to different environmental conditions including pCO2 and temperature.
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82
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Silva DP, Villela HDM, Santos HF, Duarte GAS, Ribeiro JR, Ghizelini AM, Vilela CLS, Rosado PM, Fazolato CS, Santoro EP, Carmo FL, Ximenes DS, Soriano AU, Rachid CTCC, Vega Thurber RL, Peixoto RS. Multi-domain probiotic consortium as an alternative to chemical remediation of oil spills at coral reefs and adjacent sites. MICROBIOME 2021; 9:118. [PMID: 34020712 PMCID: PMC8138999 DOI: 10.1186/s40168-021-01041-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 02/22/2021] [Indexed: 05/04/2023]
Abstract
BACKGROUND Beginning in the last century, coral reefs have suffered the consequences of anthropogenic activities, including oil contamination. Chemical remediation methods, such as dispersants, can cause substantial harm to corals and reduce their resilience to stressors. To evaluate the impacts of oil contamination and find potential alternative solutions to chemical dispersants, we conducted a mesocosm experiment with the fire coral Millepora alcicornis, which is sensitive to environmental changes. We exposed M. alcicornis to a realistic oil-spill scenario in which we applied an innovative multi-domain bioremediator consortium (bacteria, filamentous fungi, and yeast) and a chemical dispersant (Corexit® 9500, one of the most widely used dispersants), to assess the effects on host health and host-associated microbial communities. RESULTS The selected multi-domain microbial consortium helped to mitigate the impacts of the oil, substantially degrading the polycyclic aromatic and n-alkane fractions and maintaining the physiological integrity of the corals. Exposure to Corexit 9500 negatively impacted the host physiology and altered the coral-associated microbial community. After exposure, the abundances of certain bacterial genera such as Rugeria and Roseovarius increased, as previously reported in stressed or diseased corals. We also identified several bioindicators of Corexit 9500 in the microbiome. The impact of Corexit 9500 on the coral health and microbial community was far greater than oil alone, killing corals after only 4 days of exposure in the flow-through system. In the treatments with Corexit 9500, the action of the bioremediator consortium could not be observed directly because of the extreme toxicity of the dispersant to M. alcicornis and its associated microbiome. CONCLUSIONS Our results emphasize the importance of investigating the host-associated microbiome in order to detect and mitigate the effects of oil contamination on corals and the potential role of microbial mitigation and bioindicators as conservation tools. Chemical dispersants were far more damaging to corals and their associated microbiome than oil, and should not be used close to coral reefs. This study can aid in decision-making to minimize the negative effects of oil and dispersants on coral reefs. Video abstract.
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Affiliation(s)
- Denise P Silva
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Helena D M Villela
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Henrique F Santos
- Department of Marine Biology, Fluminense Federal University (UFF), Niterói, Brazil
| | - Gustavo A S Duarte
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - José Roberto Ribeiro
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Angela M Ghizelini
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Caren L S Vilela
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Phillipe M Rosado
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Carolline S Fazolato
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Erika P Santoro
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Flavia L Carmo
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Dalton S Ximenes
- Processes Laboratory, Leopoldo Américo Miguez de Mello Research Center (CENPES), Petrobras, Rio de Janeiro, Brazil
| | - Adriana U Soriano
- Environmental Treatments, Wastes and Water Resources, Leopoldo Américo Miguez de Mello Research Center (CENPES), Petrobras, Rio de Janeiro, Brazil
| | - Caio T C C Rachid
- LABEM, Paulo de Góes Institute of Microbiology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Rebecca L Vega Thurber
- Department of Microbiology, Oregon State University, Nash Hall 226, OSU, Corvallis, OR, 97331, USA.
| | - Raquel S Peixoto
- LEMM, Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- Division of Biological and Environmental Science and Engineering (BESE), Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
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83
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van Woesik R, Cacciapaglia CW. Thermal stress jeopardizes carbonate production of coral reefs across the western and central Pacific Ocean. PLoS One 2021; 16:e0249008. [PMID: 33901212 PMCID: PMC8075252 DOI: 10.1371/journal.pone.0249008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 03/09/2021] [Indexed: 11/19/2022] Open
Abstract
Coral reefs protect islands, coastal areas, and their inhabitants from storm waves and provide essential goods and services to millions of people worldwide. Yet contemporary rates of ocean warming and local disturbances are jeopardizing the reef-building capacity of coral reefs to keep up with rapid rates of sea-level rise. This study compared the reef-building capacity of shallow-water habitats at 142 sites across a potential thermal-stress gradient in the tropical Pacific Ocean. We sought to determine the extent to which habitat differences and environmental variables potentially affect rates of net carbonate production. In general, outer-exposed reefs and lagoonal-patch reefs had higher rates of net carbonate production than nearshore reefs. The study found that thermal anomalies, particularly the intensity of thermal-stress events, play a significant role in reducing net carbonate production—evident as a diminishing trend of net carbonate production from the western to the central tropical Pacific Ocean. The results also showed a latent spatial effect along the same gradient, not explained by thermal stress, suggesting that reefs in the western tropical Pacific Ocean are potentially enhanced by the proximity of reefs in the Coral Triangle—an effect that diminishes with increasing distance and isolation.
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Affiliation(s)
- Robert van Woesik
- Institute for Global Ecology, Florida Institute of Technology, Melbourne, Florida, United States of America
- * E-mail:
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84
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Eisele MH, Madrigal-Mora S, Espinoza M. Drivers of reef fish assemblages in an upwelling region from the Eastern Tropical Pacific Ocean. JOURNAL OF FISH BIOLOGY 2021; 98:1074-1090. [PMID: 33274754 DOI: 10.1111/jfb.14639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 12/01/2020] [Indexed: 06/12/2023]
Abstract
Reef fish assemblages are exposed to a wide range of anthropogenic threats as well as chronic natural disturbances. In upwelling regions, for example, there is a seasonal influx of cool nutrient-rich waters that may shape the structure and composition of reef fish assemblages. Given that climate change may disrupt the natural oceanographic processes by altering the frequency and strength of natural disturbances, understanding how fish assemblages respond to upwelling events is essential to effectively manage reef ecosystems under changing ocean conditions. This study used the baited remote underwater video stations (BRUVS) and the traditional underwater visual census (UVC) to investigate the spatiotemporal patterns of reef fish assemblages in an upwelling region in the North Pacific of Costa Rica. A total of 183 reef fish species from 60 families were recorded, of which 166 species were detected using BRUVS and 122 using UVC. Only 66% of all species were detected using both methods. This study showed that the upwelling had an important role in shaping reef fish assemblages in this region, but there was also a significant interaction between upwelling and location. In addition, other drivers such as habitat complexity and habitat composition had an effect on reef fish abundances and species. To authors' knowledge, this is the first study in the Eastern Tropical Pacific that combines BRUVS and UVC to monitor reef fish assemblages in an upwelling region, which provides more detailed information to assess the state of reef ecosystems in response to multiple threats and changing ocean conditions.
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Affiliation(s)
- Marius H Eisele
- Evolutionary Ecology and Conservation Genomics, Faculty of Natural Sciences, Ulm University, Ulm, Germany
- Computer Science, Faculty of Science, University of Tübingen, Tübingen, Germany
| | - Sergio Madrigal-Mora
- Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, San José, Costa Rica
- Escuela de Biología, Universidad de Costa Rica, San José, Costa Rica
| | - Mario Espinoza
- Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, San José, Costa Rica
- Escuela de Biología, Universidad de Costa Rica, San José, Costa Rica
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85
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Peniston JH, Barfield M, Holt RD, Orive ME. Environmental fluctuations dampen the effects of clonal reproduction on evolutionary rescue. J Evol Biol 2021; 34:710-722. [PMID: 33682225 DOI: 10.1111/jeb.13778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 01/19/2021] [Accepted: 02/22/2021] [Indexed: 12/27/2022]
Abstract
Evolutionary rescue occurs when genetic change allows a population to persist in response to an environmental change that would otherwise have led to extinction. Most studies of evolutionary rescue assume that species have either fully clonal or fully sexual reproduction; however, many species have partially clonal reproductive strategies in which they reproduce both clonally and sexually. Furthermore, the few evolutionary rescue studies that have evaluated partially clonal reproduction did not consider fluctuations in the environment, which are nearly ubiquitous in nature. Here, we use individual-based simulations to investigate how environmental fluctuations (either uncorrelated or positively autocorrelated) influence the effect of clonality on evolutionary rescue. We show that, for moderate magnitudes of environmental fluctuations, as was found in the absence of fluctuations, increasing the degree of clonality increases the probability of population persistence in response to an abrupt environmental change, but decreases persistence in response to a continuous, directional environmental change. However, with large magnitudes of fluctuations, both the benefits of clonality following a step change and the detrimental effects of clonality following a continuous, directional change are generally reduced; in fact, in the latter scenario, increasing clonality can even become beneficial if environmental fluctuations are autocorrelated. We also show that increased generational overlap dampens the effects of environmental fluctuations. Overall, we demonstrate that understanding the evolutionary rescue of partially clonal organisms requires not only knowledge of the species life history and the type of environmental change, but also an understanding of the magnitude and autocorrelation of environmental fluctuations.
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Affiliation(s)
- James H Peniston
- Department of Biology, University of Florida, Gainesville, FL, USA
| | - Michael Barfield
- Department of Biology, University of Florida, Gainesville, FL, USA
| | - Robert D Holt
- Department of Biology, University of Florida, Gainesville, FL, USA
| | - Maria E Orive
- Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS, USA
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86
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Babbel BJ, Parrish CE, Magruder LA. ICESat-2 Elevation Retrievals in Support of Satellite-Derived Bathymetry for Global Science Applications. GEOPHYSICAL RESEARCH LETTERS 2021; 48:e2020GL090629. [PMID: 33776162 PMCID: PMC7988556 DOI: 10.1029/2020gl090629] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 01/12/2021] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Bathymetry retrievals from 2D, multispectral imagery, referred to as Satellite-Derived Bathymetry (SDB), afford the potential to obtain global, nearshore bathymetric data in optically clear waters. However, accurate SDB depth retrievals are limited in the absence of "seed depths." The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) space-based altimeter has proven capable of accurate bathymetry, but methods of employing ICESat-2 bathymetry for SDB retrievals over broad spatial extents are immature. This research aims to establish and test a baseline methodology for generating bathymetric surface models using SDB with ICESat-2. The workflow is operationally efficient (17-37 min processing time) and capable of producing bathymetry of sufficient vertical accuracy for many coastal science applications, with RMSEs of 0.96 and 1.54 m when using Sentinel-2 and Landsat 8, respectively. The highest priorities for further automation have also been identified, supporting the long-range goal of global coral reef habitat change analysis using ICESat-2-aided SDB.
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Affiliation(s)
- Benjamin J. Babbel
- Department of Civil and Construction EngineeringOregon State UniversityCorvallisORUSA
| | | | - Lori A. Magruder
- Applied Research LaboratoriesUniversity of Texas at AustinAustinTXUSA
- Department of Aerospace Engineering and Engineering MechanicsUniversity of Texas at AustinAustinTXUSA
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87
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Considering the Environmental Impacts of Bioenergy Technologies to Support German Energy Transition. ENERGIES 2021. [DOI: 10.3390/en14061534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Clean energy for all, as listed in the United Nation’s SDG7, is a key component for sustainable environmental development. Therefore, it is imperative to uncover the environmental implications of alternative energy technologies. SustainableGAS project simulates different process chains for the substitution of natural gas with renewable energies in the German gas market. The project follows an interdisciplinary approach, taking into account techno-social and environmental variabilities. However, this research highlights the project results from the environmental perspective. So far, a detailed assessment of the environmental costs of alternative gas technologies with a focus on the process of energy transition has remained rare. Although such data constitute key inputs for decision-making, this study helps to bridge a substantial knowledge gap. Competing land-use systems are examined to secure central ecosystem services. To fulfill this obligation, an Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) serves as the modelling tool. InVEST assesses ecosystem services (ES) that are or may be affected by alternative bioenergy technologies. Spatially explicit model results include the water provisioning from the Water Yield Model (WYM), soil erosion and sedimentation described by the Sediment Delivery Ratio (SDR), and nutrient fluxes (N) in response to changing land use are obtained through the Nutrient Delivery Ratio (NDR). The detailed model results are finally extrapolated, which provides a comprehensive image of the environmental impacts associated with bioenergy expansion in Germany from our combination of unique Renewable Gas Plants (RGPs). The final result shows that nutrient load will reduce in southern Germany by the year 2050 compared to the reference state, and biomass use reduced by 46% crops.
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88
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Lavin CP, Jones GP, Williamson DH, Harrison HB. Minimum size limits and the reproductive value of numerous, young, mature female fish. Proc Biol Sci 2021; 288:20202714. [PMID: 33715428 DOI: 10.1098/rspb.2020.2714] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Fisheries management relies on various catch and effort controls to preserve spawning stock biomass and maximize sustainable yields while limiting fishery impacts on marine ecosystems. These include species-specific minimum or maximum size limits to protect either small non-reproductive subadults, a portion of reproductively mature adults, or large highly fecund individuals. Protecting size classes of mature fish is expected to yield a viable source of larvae for replenishing populations and reduce the risk of recruitment overfishing, yet size-specific recruitment contributions have rarely been assessed empirically. Here, we apply genetic parentage analysis to measure the reproductive success of a size-structured population of a commercially important species of coral grouper (Plectropomus maculatus-Serranidae) in no-take marine reserves (NTMRs) in the Great Barrier Reef Marine Park, Australia. Although the per capita reproductive success of individual fish increases rapidly with body length, the numerous young mature female fish, below the minimum size limit (MSL) (38 cm total length), were responsible for generating disproportionately large contributions (36%) towards larval replenishment of both fished and reserve reefs. Our findings indicate that MSLs are an effective harvest control measure to safeguard a portion of the spawning stock biomass for coral grouper and supplement recruitment subsidies assured from NTMRs.
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Affiliation(s)
- Charles P Lavin
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia
| | - Geoffrey P Jones
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia.,ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
| | - David H Williamson
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia
| | - Hugo B Harrison
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia.,Australian Institute of Marine Science, Townsville, Queensland, Australia
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89
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Dutra LXC, Haywood MDE, Singh S, Ferreira M, Johnson JE, Veitayaki J, Kininmonth S, Morris CW, Piovano S. Synergies between local and climate-driven impacts on coral reefs in the Tropical Pacific: A review of issues and adaptation opportunities. MARINE POLLUTION BULLETIN 2021; 164:111922. [PMID: 33632532 DOI: 10.1016/j.marpolbul.2020.111922] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 11/18/2020] [Accepted: 12/03/2020] [Indexed: 06/12/2023]
Abstract
Coral reefs in the tropical Pacific region are exposed to a range of anthropogenic local pressures. Climate change is exacerbating local impacts, causing unprecedented declines in coral reef habitats and bringing negative socio-economic consequences to Pacific communities who depend heavily on coral reefs for food, income and livelihoods. Continued increases in greenhouse gas emissions will drive future climate change, which will accelerate coral reef degradation. Traditional systems of resource governance in Pacific island nations provide a foundation to address local pressures and build reef resilience to climate change. Management and adaptation options should build on the regional diversity of governance systems and traditional knowledge to support community-based initiatives and cross-sectoral cooperation to address local pressures and minimize climate change impacts. Such an inclusive approach will offer enhanced opportunities to develop and implement transformative adaptation solutions, particularly in remote and regional areas where centralized management does not extend.
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Affiliation(s)
- Leo X C Dutra
- CSIRO Oceans and Atmosphere Business Unit, Queensland BioSciences Precinct, St Lucia, Brisbane, QLD 4072, Australia; School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji.
| | - Michael D E Haywood
- CSIRO Oceans and Atmosphere Business Unit, Queensland BioSciences Precinct, St Lucia, Brisbane, QLD 4072, Australia
| | - Shubha Singh
- School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji
| | - Marta Ferreira
- School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji; CIIMAR/CIMAR-Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal
| | - Johanna E Johnson
- C(2)O Pacific, Vanuatu & Australia; College of Marine & Environmental Studies, James Cook University, Cairns, QLD 4870, Australia.
| | - Joeli Veitayaki
- School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji; The University of the South Pacific, Alafua Campus, Private Bag, Apia, Samoa
| | - Stuart Kininmonth
- School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji; Centre for Ecology and Evolutionary Synthesis, University of Oslo, Oslo, Norway
| | - Cherrie W Morris
- Institute of Marine Resources, The University of the South Pacific, Laucala Bay Road, Suva, Fiji
| | - Susanna Piovano
- School of Marine Studies, Faculty of Science, Technology & Environment, School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, The University of the South Pacific, Laucala Bay Road, Suva, Fiji
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90
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Reddin CJ, Kocsis ÁT, Aberhan M, Kiessling W. Victims of ancient hyperthermal events herald the fates of marine clades and traits under global warming. GLOBAL CHANGE BIOLOGY 2021; 27:868-878. [PMID: 33230883 DOI: 10.1111/gcb.15434] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/19/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
Organismic groups vary non-randomly in their vulnerability to extinction. However, it is unclear whether the same groups are consistently vulnerable, regardless of the dominant extinction drivers, or whether certain drivers have their own distinctive and predictable victims. Given the challenges presented by anthropogenic global warming, we focus on changes in extinction selectivity trends during ancient hyperthermal events: geologically rapid episodes of global warming. Focusing on the fossil record of the last 300 million years, we identify clades and traits of marine ectotherms that were more prone to extinction under the onset of six hyperthermal events than during other times. Hyperthermals enhanced the vulnerability of marine fauna that host photosymbionts, particularly zooxanthellate corals, the reef environments they provide, and genera with actively burrowing or swimming adult life-stages. The extinction risk of larger sized fauna also increased relative to non-hyperthermal times, while genera with a poorly buffered internal physiology did not become more vulnerable on average during hyperthermals. Hyperthermal-vulnerable clades include rhynchonelliform brachiopods and bony fish, whereas resistant clades include cartilaginous fish, and ostreid and venerid bivalves. These extinction responses in the geological past mirror modern responses of these groups to warming, including range-shift magnitudes, population losses, and experimental performance under climate-related stressors. Accordingly, extinction mechanisms distinctive to rapid global warming may be indicated, including sensitivity to warming-induced seawater deoxygenation. In anticipation of modern warming-driven marine extinctions, the trends illustrated in the fossil record offer an expedient preview.
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Affiliation(s)
- Carl J Reddin
- GeoZentrum Nordbayern, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | - Ádám T Kocsis
- GeoZentrum Nordbayern, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- MTA-MTM-ELTE Research Group for Paleontology, Budapest, Hungary
| | - Martin Aberhan
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
| | - Wolfgang Kiessling
- GeoZentrum Nordbayern, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
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91
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McFadden CS, Quattrini AM, Brugler MR, Cowman PF, Dueñas LF, Kitahara MV, Paz-García DA, Reimer JD, Rodríguez E. Phylogenomics, Origin, and Diversification of Anthozoans (Phylum Cnidaria). Syst Biol 2021; 70:635-647. [PMID: 33507310 DOI: 10.1093/sysbio/syaa103] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 12/18/2020] [Accepted: 12/21/2020] [Indexed: 01/19/2023] Open
Abstract
Anthozoan cnidarians (corals and sea anemones) include some of the world's most important foundation species, capable of building massive reef complexes that support entire ecosystems. Although previous molecular phylogenetic analyses have revealed widespread homoplasy of the morphological characters traditionally used to define orders and families of anthozoans, analyses using mitochondrial genes or rDNA have failed to resolve many key nodes in the phylogeny. With a fully resolved, time-calibrated phylogeny for 234 species constructed from hundreds of ultraconserved elements and exon loci, we explore the evolutionary origins of the major clades of Anthozoa and some of their salient morphological features. The phylogeny supports reciprocally monophyletic Hexacorallia and Octocorallia, with Ceriantharia as the earliest diverging hexacorals; two reciprocally monophyletic clades of Octocorallia; and monophyly of all hexacoral orders with the exception of the enigmatic sea anemone Relicanthus daphneae. Divergence dating analyses place Anthozoa in the Cryogenian to Tonian periods (648-894 Ma), older than has been suggested by previous studies. Ancestral state reconstructions indicate that the ancestral anthozoan was a solitary polyp that had bilateral symmetry and lacked a skeleton. Colonial growth forms and the ability to precipitate calcium carbonate evolved in the Ediacaran (578 Ma) and Cambrian (503 Ma) respectively; these hallmarks of reef-building species have subsequently arisen multiple times independently in different orders. Anthozoans formed associations with photosymbionts by the Devonian (383 Ma), and photosymbioses have been gained and lost repeatedly in all orders. Together, these results have profound implications for the interpretation of the Precambrian environment and the early evolution of metazoans.[Bilateral symmetry; coloniality; coral; early metazoans; exon capture; Hexacorallia; Octocorallia photosymbiosis; sea anemone; ultraconserved elements.].
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Affiliation(s)
- Catherine S McFadden
- Department of Biology, Harvey Mudd College, 1250 N. Dartmouth Ave., Claremont, CA 91711 USA
| | - Andrea M Quattrini
- Department of Biology, Harvey Mudd College, 1250 N. Dartmouth Ave., Claremont, CA 91711 USA.,Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - Mercer R Brugler
- Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA.,Biological Sciences Department, NYC College of Technology, City University of New York, 285 Jay Street, Brooklyn, NY 11201, USA.,Department of Natural Sciences, University of South Carolina Beaufort, 801 Carteret Street, Beaufort, SC 29902, USA
| | - Peter F Cowman
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia.,Biodiversity and Geosciences Program, Museum of Tropical Queensland, Queensland Museum, Townsville, QLD 4810, Australia
| | - Luisa F Dueñas
- Departamento de Biología, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No.45-03 Edificio 421, Bogotá, D.C., Colombia
| | - Marcelo V Kitahara
- Department of Marine Science, Federal University of São Paulo, Santos, SP 11070-100 Brazil.,Centre for Marine Biology, University of São Paulo, São Sebastião, SP 11612-109 Brazil
| | - David A Paz-García
- CONACyT-Centro de Investigaciones Biológicas del Noroeste (CIBNOR). Laboratorio de Necton y Ecología de Arrecifes. Calle IPN 195, Col. Playa Palo de Santa Rita Sur, 23096 La Paz, B.C.S., México
| | - James D Reimer
- Molecular Invertebrate Systematics and Ecology Laboratory, Department of Marine Science, Chemistry, and Biology, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan.,Tropical Biosphere Research Center, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
| | - Estefanía Rodríguez
- Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA
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92
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Manullang C, Millyaningrum IH, Iguchi A, Miyagi A, Tanaka Y, Nojiri Y, Sakai K. Responses of branching reef corals Acropora digitifera and Montipora digitata to elevated temperature and pCO 2. PeerJ 2021; 8:e10562. [PMID: 33391879 PMCID: PMC7759137 DOI: 10.7717/peerj.10562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 11/22/2020] [Indexed: 11/20/2022] Open
Abstract
Anthropogenic emission of CO2 into the atmosphere has been increasing exponentially, causing ocean acidification (OA) and ocean warming (OW). The “business-as-usual” scenario predicts that the atmospheric concentration of CO2 may exceed 1,000 µatm and seawater temperature may increase by up to 3 °C by the end of the 21st century. Increases in OA and OW may negatively affect the growth and survival of reef corals. In the present study, we separately examined the effects of OW and OA on the corals Acropora digitifera and Montipora digitata, which are dominant coral species occurring along the Ryukyu Archipelago, Japan, at three temperatures (28 °C, 30 °C, and 32 °C) and following four pCO2 treatments (400, 600, 800, and 1,000 µatm) in aquarium experiments. In the OW experiment, the calcification rate (p = 0.02), endosymbiont density, and maximum photosynthetic efficiency (Fv/Fm) (both p < 0.0001) decreased significantly at the highest temperature (32 °C) compared to those at the lower temperatures (28 °C and 30 °C) in both species. In the OA experiment, the calcification rate decreased significantly as pCO2 increased (p < 0.0001), whereas endosymbiont density, chlorophyll content, and Fv/Fm were not affected. The calcification rate of A. digitifera showed greater decreases from 30 °C to 32 °C than that of M. digitata. The calcification of the two species responded differently to OW and OA. These results suggest that A. digitifera is more sensitive to OW than M. digitata, whereas M. digitata is more sensitive to OA. Thus, differences in the sensitivity of the two coral species to OW and OA might be attributed to differences in the endosymbiont species and high calcification rates, respectively.
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Affiliation(s)
- Cristiana Manullang
- Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa, Japan
| | | | - Akira Iguchi
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
| | - Aika Miyagi
- Department of Bioresources Engineering, National Institute of Technology, Okinawa College, Nago-City, Okinawa, Japan
| | - Yasuaki Tanaka
- Environmental and Life Sciences, Universiti Brunei Darussalam, Brunei Darussalam
| | - Yukihiro Nojiri
- Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.,Graduate School of Earth and Environmental Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - Kazuhiko Sakai
- Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, Motobu, Okinawa, Japan
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93
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Assis JM, Abreu F, Villela HMD, Barno A, Valle RF, Vieira R, Taveira I, Duarte G, Bourne DG, Høj L, Peixoto RS. Delivering Beneficial Microorganisms for Corals: Rotifers as Carriers of Probiotic Bacteria. Front Microbiol 2021; 11:608506. [PMID: 33384676 PMCID: PMC7769773 DOI: 10.3389/fmicb.2020.608506] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/25/2020] [Indexed: 01/10/2023] Open
Abstract
The use of Beneficial Microorganisms for Corals (BMCs) to increase the resistance of corals to environmental stress has proven to be effective in laboratory trials. Because direct inoculation of BMCs in larger tanks or in the field can be challenging, a delivery mechanism is needed for efficient transmission of the BMC consortium. Packaged delivery mechanisms have been successfully used to transmit probiotics to other organisms, including humans, lobsters, and fish. Here, we tested a method for utilizing rotifers of the species Brachionus plicatilis for delivery of BMCs to corals of the species Pocillopora damicornis. Epifluorescence microscopy combined with a live/dead cell staining assay was used to evaluate the viability of the BMCs and monitor their in vivo uptake by the rotifers. The rotifers efficiently ingested BMCs, which accumulated in the digestive system and on the body surface after 10 min of interaction. Scanning electron microscopy confirmed the adherence of BMCs to the rotifer surfaces. BMC-enriched rotifers were actively ingested by P. damicornis corals, indicating that this is a promising technique for administering coral probiotics in situ. Studies to track the delivery of probiotics through carriers such as B. plicatilis, and the provision or establishment of beneficial traits in corals are the next proof-of-concept research priorities.
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Affiliation(s)
- Juliana M Assis
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fernanda Abreu
- Laboratory of Cellular Biology and Magnetotaxis, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Helena M D Villela
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Adam Barno
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafael F Valle
- IMAM-AquaRio - Rio de Janeiro Aquarium Research Center, Rio de Janeiro, Brazil
| | - Rayssa Vieira
- IMAM-AquaRio - Rio de Janeiro Aquarium Research Center, Rio de Janeiro, Brazil
| | - Igor Taveira
- Laboratory of Cellular Biology and Magnetotaxis, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Duarte
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,IMAM-AquaRio - Rio de Janeiro Aquarium Research Center, Rio de Janeiro, Brazil
| | - David G Bourne
- Australian Institute of Marine Science, Townsville, WA, Australia.,College of Science and Engineering, James Cook University, Townsville, QLD, Australia
| | - Lone Høj
- Australian Institute of Marine Science, Townsville, WA, Australia
| | - Raquel S Peixoto
- Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,IMAM-AquaRio - Rio de Janeiro Aquarium Research Center, Rio de Janeiro, Brazil
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94
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Pereira PHC, Côrtes LGF, Lima GV, Gomes E, Pontes AVF, Mattos F, Araújo ME, Ferreira-Junior F, Sampaio CLS. Reef fishes biodiversity and conservation at the largest Brazilian coastal Marine Protected Area (MPA Costa dos Corais). NEOTROPICAL ICHTHYOLOGY 2021. [DOI: 10.1590/1982-0224-2021-0071] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract Coral reefs harbor one of the largest fish biodiversity on earth; yet information on reef fishes is still absent for many regions. We analyzed reef fish richness, distribution, and conservation on the largest Brazilian multiple use coastal MPA; which cover a large extent of coral reefs at the SWA. A total of 325 fish species have been listed for MPA Costa dos Corais, including Chondrichthyes (28 species) and Actinopterygii (297). Fish species were represented by 81 families and the most representative families were Carangidae (23 species), Labridae (21) and Gobiidae (15). The MPA fish richness represented 44% of all recorded fish species of the Southwestern Atlantic Ocean (SWA) highlighting the large-scale importance of this MPA. A total of 40 species (12%) are registered at Near Threatened (NT), Vulnerable (VU), Endangered (EN) or Critically Endangered (CR). This study reinforces the importance of MPA Costa dos Corais on reef fish biodiversity and conservation and emphasize the urgent need of conservation strategies.
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Affiliation(s)
| | - Luís G. F. Côrtes
- Projeto Conservação Recifal, Brazil; Universidade Federal de Pernambuco, Brazil
| | | | - Erandy Gomes
- Projeto Conservação Recifal, Brazil; Universidade Federal de Pernambuco, Brazil; Universidade Federal de Pernambuco, Brazil
| | | | | | - Maria E. Araújo
- Universidade Federal de Pernambuco, Brazil; Universidade Federal de Pernambuco, Brazil
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95
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McRae CJ, Huang WB, Fan TY, Côté IM. Effects of thermal conditioning on the performance of Pocillopora acuta adult coral colonies and their offspring. CORAL REEFS (ONLINE) 2021; 40:1491-1503. [PMID: 34720373 PMCID: PMC8550305 DOI: 10.1007/s00338-021-02123-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 05/25/2021] [Indexed: 05/02/2023]
Abstract
UNLABELLED Ocean warming induced by climate change is the greatest threat to the persistence of coral reefs globally. Given the current rate of ocean warming, there may not be sufficient time for natural acclimation or adaptation by corals. This urgency has led to the exploration of active management techniques aimed at enhancing thermal tolerance in corals. Here, we test the capacity for transgenerational acclimation in the reef-building coral Pocillopora acuta as a means of increasing offspring performance in warmer waters. We exposed coral colonies from a reef influenced by intermittent upwelling and constant warm-water effluent from a nuclear power plant to temperatures that matched (26 °C) or exceeded (29.5 °C) season-specific mean temperatures for three reproductive cycles; offspring were allowed to settle and grow at both temperatures. Heated colonies reproduced significantly earlier in the lunar cycle and produced fewer and smaller planulae. Recruitment was lower at the heated recruitment temperature regardless of parent treatment. Recruit survival did not differ based on parent or recruitment temperature. Recruits from heated parents were smaller and had lower maximum quantum yield (Fv/Fm), a measurement of symbiont photochemical performance. We found no direct evidence that thermal conditioning of adult P. acuta corals improves offspring performance in warmer water; however, chronic exposure of parent colonies to warmer temperatures at the source reef site may have limited transgenerational acclimation capacity. The extent to which coral response to this active management approach might vary across species and sites remains unclear and merits further investigation. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s00338-021-02123-9.
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Affiliation(s)
- Crystal J. McRae
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
- Department of Biological Sciences, Simon Fraser University, British Columbia, Canada
| | - Wen-Bin Huang
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
| | - Tung-Yung Fan
- Institute of Marine Biology, National Dong Hwa University, Pingtung, Taiwan
- National Museum of Marine Biology and Aquarium, Pingtung, Taiwan
| | - Isabelle M. Côté
- Department of Biological Sciences, Simon Fraser University, British Columbia, Canada
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96
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Raj KD, Mathews G, Obura DO, Laju RL, Bharath MS, Kumar PD, Arasamuthu A, Kumar TKA, Edward JKP. Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India. Sci Rep 2020; 10:22133. [PMID: 33335160 PMCID: PMC7746711 DOI: 10.1038/s41598-020-79152-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 12/04/2020] [Indexed: 12/21/2022] Open
Abstract
Coral reefs around the world are undergoing severe decline in the past few decades. Mass coral mortalities have predominantly been reported to be caused by coral bleaching or disease outbreaks. Temporary hypoxic conditions caused by algal blooms can trigger mass coral mortalities though are reported rarely. In this study in Gulf of Mannar (GoM), southeast India, we report a significant coral mortality caused by a bloom of the ciguatoxic dinoflagellate Noctiluca scintillans during September–October 2019. Dissolved oxygen levels declined below 2 mg l−1 during the bloom causing temporary hypoxia and mortality (up to 71.23%) in the fast growing coral genera Acropora, Montipora and Pocillopora. Due to global climate change, more frequent and larger algal blooms are likely in the future. Hence, it is likely that shallow water coral reefs will be affected more frequently by episodic hypoxic conditions driven by algal blooms. More studies are, however, required to understand the mechanism of coral mortality due to algal blooms, impacts on community composition and the potential for subsequent recovery.
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Affiliation(s)
- K Diraviya Raj
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India.
| | - G Mathews
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
| | - David O Obura
- CORDIO East Africa, P.O. Box 10135, Mombasa, 80101, Kenya
| | - R L Laju
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
| | - M Selva Bharath
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
| | - P Dinesh Kumar
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
| | - A Arasamuthu
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
| | - T K Ashok Kumar
- Gulf of Mannar Marine National Park, Ramanathapuram, 623 503, India
| | - J K Patterson Edward
- Suganthi Devadason Marine Research Institute, 44-Beach Road, Tuticorin, 628001, Tamil Nadu, India
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97
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Silbiger NJ, Donahue MJ, Lubarsky K. Submarine groundwater discharge alters coral reef ecosystem metabolism. Proc Biol Sci 2020; 287:20202743. [PMID: 33323091 DOI: 10.1098/rspb.2020.2743] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Submarine groundwater discharge (SGD) influences near-shore coral reef ecosystems worldwide. SGD biogeochemistry is distinct, typically with higher nutrients, lower pH, cooler temperature and lower salinity than receiving waters. SGD can also be a conduit for anthropogenic nutrients and other pollutants. Using Bayesian structural equation modelling, we investigate pathways and feedbacks by which SGD influences coral reef ecosystem metabolism at two Hawai'i sites with distinct aquifer chemistry. The thermal and biogeochemical environment created by SGD changed net ecosystem production (NEP) and net ecosystem calcification (NEC). NEP showed a nonlinear relationship with SGD-enhanced nutrients: high fluxes of moderately enriched SGD (Wailupe low tide) and low fluxes of highly enriched SGD (Kūpikipiki'ō high tide) increased NEP, but high fluxes of highly enriched SGD (Kūpikipiki'ō low tide) decreased NEP, indicating a shift toward microbial respiration. pH fluctuated with NEP, driving changes in the net growth of calcifiers (NEC). SGD enhances biological feedbacks: changes in SGD from land use and climate change will have consequences for calcification of coral reef communities, and thereby shoreline protection.
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Affiliation(s)
- Nyssa J Silbiger
- Biology Department, California State University, Northridge, CA 91330, USA
| | - Megan J Donahue
- Hawai'i Institute of Marine Biology, University of Hawai'i at Mānoa, Kāne'ohe, HI 96744, USA
| | - Katie Lubarsky
- Scripps Institution of Oceanography, University of California, San Diego, CA, 92037, USA
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98
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Reproduction in Urbanised Coastal Waters: Shallow-Water Sea Anemones (Entacmaea quadricolor and Stichodactyla haddoni) Maintain High Genetic Diversity and Panmixia. DIVERSITY 2020. [DOI: 10.3390/d12120467] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Sea anemones are sedentary marine animals that tend to disperse via planktonic larvae and are predicted to have high population connectivity in undisturbed habitats. We test whether two sea anemone species living in two different tidal zones of a highly disturbed marine environment can maintain high genetic connectivity. More than 1000 loci with single-nucleotide polymorphisms (SNPs) were obtained with double-digest RADseq for 81 Stichodactyla haddoni and 99 Entacmaea quadricolor individuals to test for population genetic structure. We find evidence that both species predominantly propagate via sexual reproduction, and asexual reproduction is limited. We observe panmixia that indicates the absence of effective dispersal barriers for these species living in a highly anthropogenically disturbed environment. This is positive news for both species that are also found in the aquarium trade. More fundamentally, our results suggest that inhabiting different parts of a shallow reef may not affect a species’ population connectivity nor favour asexual reproduction.
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99
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Shu L, Qian X, Brock DA, Geist KS, Queller DC, Strassmann JE. Loss and resiliency of social amoeba symbiosis under simulated warming. Ecol Evol 2020; 10:13182-13189. [PMID: 33304528 PMCID: PMC7713973 DOI: 10.1002/ece3.6909] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/21/2020] [Accepted: 09/17/2020] [Indexed: 12/16/2022] Open
Abstract
Anthropogenic global change is increasingly raising concerns about collapses of symbiotic interactions worldwide. Therefore, understanding how climate change affects symbioses remains a challenge and demands more study. Here, we look at how simulated warming affects the social ameba Dictyostelium discoideum and its relationship with its facultative bacterial symbionts, Paraburkholderia hayleyella and Paraburkholderia agricolaris. We cured and cross-infected ameba hosts with different symbionts. We found that warming significantly decreased D. discoideum's fitness, and we found no sign of local adaptation in two wild populations. Experimental warming had complex effects on these symbioses with responses determined by both symbiont and host. Neither of these facultative symbionts increases its hosts' thermal tolerance. The nearly obligate symbiont with a reduced genome, P. hayleyella, actually decreases D. discoideum's thermal tolerance and even causes symbiosis breakdown. Our study shows how facultative symbioses may have complex responses to global change.
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Affiliation(s)
- Longfei Shu
- Environmental Microbiomics Research CenterSchool of Environmental Science and EngineeringSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai)Sun Yat‐sen UniversityGuangzhouChina
- Department of BiologyWashington University in St. LouisSt. LouisMOUSA
| | - Xinye Qian
- Department of BiologyWashington University in St. LouisSt. LouisMOUSA
| | - Debra A. Brock
- Department of BiologyWashington University in St. LouisSt. LouisMOUSA
| | | | - David C. Queller
- Department of BiologyWashington University in St. LouisSt. LouisMOUSA
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100
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Sun CY, Stifler CA, Chopdekar RV, Schmidt CA, Parida G, Schoeppler V, Fordyce BI, Brau JH, Mass T, Tambutté S, Gilbert PUPA. From particle attachment to space-filling coral skeletons. Proc Natl Acad Sci U S A 2020; 117:30159-30170. [PMID: 33188087 PMCID: PMC7720159 DOI: 10.1073/pnas.2012025117] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Reef-building corals and their aragonite (CaCO3) skeletons support entire reef ecosystems, yet their formation mechanism is poorly understood. Here we used synchrotron spectromicroscopy to observe the nanoscale mineralogy of fresh, forming skeletons from six species spanning all reef-forming coral morphologies: Branching, encrusting, massive, and table. In all species, hydrated and anhydrous amorphous calcium carbonate nanoparticles were precursors for skeletal growth, as previously observed in a single species. The amorphous precursors here were observed in tissue, between tissue and skeleton, and at growth fronts of the skeleton, within a low-density nano- or microporous layer varying in thickness from 7 to 20 µm. Brunauer-Emmett-Teller measurements, however, indicated that the mature skeletons at the microscale were space-filling, comparable to single crystals of geologic aragonite. Nanoparticles alone can never fill space completely, thus ion-by-ion filling must be invoked to fill interstitial pores. Such ion-by-ion diffusion and attachment may occur from the supersaturated calcifying fluid known to exist in corals, or from a dense liquid precursor, observed in synthetic systems but never in biogenic ones. Concomitant particle attachment and ion-by-ion filling was previously observed in synthetic calcite rhombohedra, but never in aragonite pseudohexagonal prisms, synthetic or biogenic, as observed here. Models for biomineral growth, isotope incorporation, and coral skeletons' resilience to ocean warming and acidification must take into account the dual formation mechanism, including particle attachment and ion-by-ion space filling.
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Affiliation(s)
- Chang-Yu Sun
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Cayla A Stifler
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Rajesh V Chopdekar
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Connor A Schmidt
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Ganesh Parida
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Vanessa Schoeppler
- B CUBE-Center for Molecular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | | | - Jack H Brau
- Department of Physics, University of Wisconsin, Madison, WI 53706
| | - Tali Mass
- Marine Biology Department, University of Haifa, 31905 Haifa, Israel
| | - Sylvie Tambutté
- Marine Biology Department, Centre Scientifique de Monaco, 98000 Monaco, Principality of Monaco
| | - Pupa U P A Gilbert
- Department of Physics, University of Wisconsin, Madison, WI 53706;
- Department of Chemistry, University of Wisconsin, Madison, WI 53706
- Department of Geoscience, University of Wisconsin, Madison, WI 53706
- Department of Materials Science, University of Wisconsin, Madison, WI 53706
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