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Kalvelage J, Rabus R. Multifaceted Dinoflagellates and the Marine Model Prorocentrum cordatum. Microb Physiol 2024; 34:197-242. [PMID: 39047710 DOI: 10.1159/000540520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Accepted: 07/20/2024] [Indexed: 07/27/2024]
Abstract
BACKGROUND Dinoflagellates are a monophyletic group within the taxon Alveolata, which comprises unicellular eukaryotes. Dinoflagellates have long been studied for their organismic and morphologic diversity as well as striking cellular features. They have a main size range of 10-100 µm, a complex "cell covering", exceptionally large genomes (∼1-250 Gbp with a mean of 50,000 protein-encoding genes) spread over a variable number of highly condensed chromosomes, and perform a closed mitosis with extranuclear spindles (dinomitosis). Photosynthetic, marine, and free-living Prorocentrum cordatum is a ubiquitously occurring, bloom-forming dinoflagellate, and an emerging model system, particularly with respect to systems biology. SUMMARY Focused ion beam/scanning electron microscopy (FIB/SEM) analysis of P. cordatum recently revealed (i) a flattened nucleus with unusual structural features and a total of 62 tightly packed chromosomes, (ii) a single, barrel-shaped chloroplast devoid of grana and harboring multiple starch granules, (iii) a single, highly reticular mitochondrion, and (iv) multiple phosphate and lipid storage bodies. Comprehensive proteomics of subcellular fractions suggested (i) major basic nuclear proteins to participate in chromosome condensation, (ii) composition of nuclear pores to differ from standard knowledge, (iii) photosystems I and II, chloroplast complex I, and chlorophyll a-b binding light-harvesting complex to form a large megacomplex (>1.5 MDa), and (iv) an extraordinary richness in pigment-binding proteins. Systems biology-level investigation of heat stress response demonstrated a concerted down-regulation of CO2-concentrating mechanisms, CO2-fixation, central metabolism, and monomer biosynthesis, which agrees with reduced growth yields. KEY MESSAGES FIB/SEM analysis revealed new insights into the remarkable subcellular architecture of P. cordatum, complemented by proteogenomic unraveling of novel nuclear structures and a photosynthetic megacomplex. These recent findings are put in the wider context of current understanding of dinoflagellates.
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Affiliation(s)
- Jana Kalvelage
- Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany
| | - Ralf Rabus
- Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany
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2
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O'Leary H, Alvarez S, Bahja F. What's in a name? Political and economic concepts differ in social media references to harmful algae blooms. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 357:120799. [PMID: 38581895 DOI: 10.1016/j.jenvman.2024.120799] [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: 12/15/2023] [Revised: 02/24/2024] [Accepted: 03/28/2024] [Indexed: 04/08/2024]
Abstract
Policies and management decisions in the marine environment are driven in part by public sentiment which can grow more intense during hazard events like Harmful Algae Blooms (HABs). The public conversations on social media sites like Twitter (before X) reveal the polarized nature of HABs through nuanced language and sentiment. This article uses mixed methods of machine learned topic modeling and inductive qualitative coding to describe the ways the long-term 2017-2019 Karenia brevis "red tide" bloom were politicized across Florida's South West coast. It finds that there are topical differences in keywords related to place (e.g. beach, Florida, coast), agent (individual or organization), and epistemic values (reliance on scientific and/or media reports). These topical differences demonstrate different levels of politicization and partisanship in qualitative analysis. Conceptually, this research demonstrates the ways different dimensions of a long-duration marine hazard can be polarized. Regarding management, this research provides insights to political and organizational stakeholders and the gaps in the discourse shaping marine hazards which can be used to strategically guide future social media engagement to manage politicization. What if all the careful work that resource and environmental managers do can be undone by simple, seemingly uncontroversial words? In an era of increased environmental and marine distress-coupled with short format communication-the ways environmental managers choose their words is crucial, even between ostensibly inconsequential nouns like "red tide" or "algae bloom." Policies and management decisions in the marine environment are driven in part by public sentiment which can grow more intense during hazard events like Harmful Algae Blooms (HABs). The public conversations on social media sites like Twitter (before X) reveal the polarized nature of HABs through nuanced language and sentiment. This article relies on mining social media posts, and uses mixed methods of machine-learned topic modeling and human-driven inductive qualitative coding to describe the ways the long-term 2017-2019 Karenia brevis "red tide" blooms were politicized across Florida's South West coast. It finds that there are topical differences in keywords related to place (e.g. beach, Florida, coast), agent (individual or organization), and epistemic values (reliance on scientific and/or media reports). These topical differences demonstrate different levels of politicization and partisanship in qualitative analysis. Conceptually, this research demonstrates the ways different dimensions of a long-duration marine hazard can be polarized. Regarding management, this research provides insights to political and organizational stakeholders and the gaps in the discourse shaping marine hazards which can be used to strategically guide future social media engagement to manage politicization.
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Affiliation(s)
- Heather O'Leary
- Department of Anthropology, University of South Florida, USA.
| | - Sergio Alvarez
- Rosen College of Hospitality Management, University of Central Florida, USA
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3
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Singh GG, Sajid Z, Mather C. Quantitative analysis of mass mortality events in salmon aquaculture shows increasing scale of fish loss events around the world. Sci Rep 2024; 14:3763. [PMID: 38453975 PMCID: PMC10920753 DOI: 10.1038/s41598-024-54033-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 02/07/2024] [Indexed: 03/09/2024] Open
Abstract
Globally, salmon aquaculture promises to contribute to sustainable sources of animal protein for a growing human population. However, the growth of the industry also includes increased reports of mass mortality events-disaster events where large numbers of fish die in short periods of time. As salmon production increases in scale and more technology is used to grow salmon in contexts otherwise not suited for them, there is a possibility for more frequent and more severe mortality events. Despite investigations into specific cases of mass mortality events-no global study has been conducted to see if large scale mortality is increasing in frequency and scale. Using a global dataset of publicly available and government-collated data on salmon mortality events including nations responsible for the majority of salmon aquaculture, we document trends in mortality events, showing that in some of the major salmon producing nations of the world (in particular Norway, Canada, and the UK), mass mortality events have increased in frequency from 2012 to 2022. We also show that the scope of mass mortality events has increased over time-that is, the upper bound of how many fish were killed in a specific mortality event has increased over time. Finally, the expected maximum size of a mass mortality event differs from country to country, but is likely much larger than site and jurisdictional thresholds of concern for animal welfare, early warning thresholds, and capacity to respond to mortality events. The consequences of the increased scale and scope of mass mortality events extend past aquaculture production to include severe consequences to aquaculture companies and to coastal communities who depend on aquaculture. Our results agree with predictions of the concept of "manufactured risk", which suggests that risk emerges from the aggressive use of technology to optimize production in variable environments, and we argue that there is a need for more fine-scale and standard data collection on salmon mortality events, and that future investigations into salmon aquaculture should increase focus on disaster potential and realization.
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Affiliation(s)
- Gerald G Singh
- Ocean Nexus, School of Environmental Studies, University of Victoria, Victoria, Canada.
| | - Zaman Sajid
- Mary Kay O'Connor Process Safety Center, Texas A&M University, College Station, USA
| | - Charles Mather
- Department of Geography, Memorial University of Newfoundland and Labrador, St. John's, Canada
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4
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Díaz PA, Figueroa RI. Toxic Algal Bloom Recurrence in the Era of Global Change: Lessons from the Chilean Patagonian Fjords. Microorganisms 2023; 11:1874. [PMID: 37630433 PMCID: PMC10458688 DOI: 10.3390/microorganisms11081874] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 08/27/2023] Open
Abstract
Toxic and harmful algal blooms (HABs) are a global problem affecting human health, marine ecosystems, and coastal economies, the latter through their impact on aquaculture, fisheries, and tourism. As our knowledge and the techniques to study HABs advance, so do international monitoring efforts, which have led to a large increase in the total number of reported cases. However, in addition to increased detections, environmental factors associated with global change, mainly high nutrient levels and warming temperatures, are responsible for the increased occurrence, persistence, and geographical expansion of HABs. The Chilean Patagonian fjords provide an "open-air laboratory" for the study of climate change, including its impact on the blooms of several toxic microalgal species, which, in recent years, have undergone increases in their geographical range as well as their virulence and recurrence (the species Alexandrium catenella, Pseudochattonella verruculosa, and Heterosigma akashiwo, and others of the genera Dinophysis and Pseudo-nitzschia). Here, we review the evolution of HABs in the Chilean Patagonian fjords, with a focus on the established connections between key features of HABs (expansion, recurrence, and persistence) and their interaction with current and predicted global climate-change-related factors. We conclude that large-scale climatic anomalies such as the lack of rain and heat waves, events intensified by climate change, promote the massive proliferation of these species by creating ideal conditions for their growth and persistence, as they affect water-column stratification, nutrient inputs, and reproductive rates.
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Affiliation(s)
- Patricio A. Díaz
- Centro i~mar, Universidad de Los Lagos, Casilla 557, Puerto Montt 5480000, Chile
- Centre for Biotechnology and Bioengineering (CeBiB), Universidad de Los Lagos, Casilla 557, Puerto Montt 5480000, Chile
| | - Rosa I. Figueroa
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO-CSIC), Subida a Radio Faro 50, 36390 Vigo, Spain;
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Rozzi R, Álvarez R, Castro V, Núñez D, Ojeda J, Tauro A, Massardo F. Biocultural Calendars Across Four Ethnolinguistic Communities in Southwestern South America. GEOHEALTH 2023; 7:e2022GH000623. [PMID: 37091293 PMCID: PMC10117173 DOI: 10.1029/2022gh000623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 05/03/2023]
Abstract
Since the mid-20th century, the so-called Great Acceleration (sensu Steffen et al., 2007, https://doi.org/10.1579/0044-7447(2007)36[614:TAAHNO]2.0.CO;2) has amplified processes of ecosystem degradation, extinction of biological species, displacement of local peoples, losses of languages, and cultural diversity. These losses are still underperceived by the academic community, and by a global society that is disconnected from biocultural diversity. To reconnect society with biocultural diversity, we integrate temporal and spatial dimensions of seasonal cycles, by combining two conceptual frameworks: ecological calendars and the "3Hs" model of the biocultural ethic (sensu Rozzi, 2012, https://doi.org/10.5840/enviroethics20123414). The latter values the vital links between human and other-than-human co-inhabitants, their life habits (e.g., cultural practices of humans or life cycles of other-than-human species), and the structure and processes of their shared habitats. This integration enhances an understanding of links between cultural practices and the life cycles of biocultural keystone species. As a synthesis, we use the term biocultural calendars to emphasize their co-constitutive nature that result from interactions between dynamic biophysical and cultural processes embedded in specific ecosystems and cultures. These calendars link astronomical, biological, and cultural seasonal cycles that sustain life and enhance the integration of Indigenous and scientific knowledge to confront challenges of climate change faced from local to global scales. To illustrate this integration, we examine cultural practices and socio-environmental changes across four contrasting ethnolinguistic communities in southwestern South America, from southern to northern Chile along a marked climatic gradient to show the broad application of the concept of biocultural calendars.
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Affiliation(s)
- Ricardo Rozzi
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- Sub‐Antarctic Biocultural Conservation ProgramDepartment of Philosophy and Religionand Department of Biological SciencesUniversity of North TexasDentonTXUSA
- Cary Institute of Ecosystem StudiesMillbrookNYUSA
| | - Ricardo Álvarez
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- Millennium Nucleus Ocean, Heritage & CultureEscuela de ArqueologíaUniversidad Austral de ChilePuerto MonttChile
| | - Victoria Castro
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- Departamento de AntropologíaFacultad de Ciencias Sociales Universidad de ChileCampus Juan Gómez MillasSantiagoChile
| | - David Núñez
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- ONG PolocSantiagoChile
| | - Jaime Ojeda
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- School of Environmental StudiesUniversity of VictoriaVictoriaBCCanada
| | - Alejandra Tauro
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
- El Colegio de Puebla ACPueblaMexico
| | - Francisca Massardo
- Cape Horn International Center (CHIC)Omora Ethnobotanical ParkUniversidad de MagallanesPuerto WilliamsChile
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Ohga H, Shibata K, Sakanoue R, Ogawa T, Kitano H, Kai S, Ohta K, Nagano N, Nagasako T, Uchida S, Sakuma T, Yamamoto T, Kim S, Tashiro K, Kuhara S, Gen K, Fujiwara A, Kazeto Y, Kobayashi T, Matsuyama M. Development of a chub mackerel with less-aggressive fry stage by genome editing of arginine vasotocin receptor V1a2. Sci Rep 2023; 13:3190. [PMID: 36823281 PMCID: PMC9950132 DOI: 10.1038/s41598-023-30259-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
Genome editing is a technology that can remarkably accelerate crop and animal breeding via artificial induction of desired traits with high accuracy. This study aimed to develop a chub mackerel variety with reduced aggression using an experimental system that enables efficient egg collection and genome editing. Sexual maturation and control of spawning season and time were technologically facilitated by controlling the photoperiod and water temperature of the rearing tank. In addition, appropriate low-temperature treatment conditions for delaying cleavage, shape of the glass capillary, and injection site were examined in detail in order to develop an efficient and robust microinjection system for the study. An arginine vasotocin receptor V1a2 (V1a2) knockout (KO) strain of chub mackerel was developed in order to reduce the frequency of cannibalistic behavior at the fry stage. Video data analysis using bioimage informatics quantified the frequency of aggressive behavior, indicating a significant 46% reduction (P = 0.0229) in the frequency of cannibalistic behavior than in wild type. Furthermore, in the V1a2 KO strain, the frequency of collisions with the wall and oxygen consumption also decreased. Overall, the manageable and calm phenotype reported here can potentially contribute to the development of a stable and sustainable marine product.
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Affiliation(s)
- Hirofumi Ohga
- grid.177174.30000 0001 2242 4849Aqua-Bioresource Innovation Center (ABRIC) Karatsu Satellite, Faculty of Agriculture, Kyushu University, Saga, 847-0132 Japan
| | - Koki Shibata
- grid.177174.30000 0001 2242 4849Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395 Japan
| | - Ryo Sakanoue
- grid.177174.30000 0001 2242 4849Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395 Japan
| | - Takuma Ogawa
- grid.177174.30000 0001 2242 4849Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395 Japan
| | - Hajime Kitano
- grid.410851.90000 0004 1764 1824Fishery Third Group, Marine Fisheries Research and Development Center, Japan Fisheries Research and Education Agency (FRA), Kanagawa, 221-8529 Japan
| | - Satoshi Kai
- grid.177174.30000 0001 2242 4849Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395 Japan
| | - Kohei Ohta
- grid.177174.30000 0001 2242 4849Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395 Japan
| | - Naoki Nagano
- grid.410849.00000 0001 0657 3887Laboratory of Aquaculture, Faculty of Agriculture, University of Miyazaki, Miyazaki, 889-2192 Japan
| | - Tomoya Nagasako
- grid.177174.30000 0001 2242 4849Human Interface Laboratory, Factory of Information Science and Electrical Engineering, Kyushu University, Fukuoka, 819-0395 Japan
| | - Seiichi Uchida
- grid.177174.30000 0001 2242 4849Human Interface Laboratory, Factory of Information Science and Electrical Engineering, Kyushu University, Fukuoka, 819-0395 Japan
| | - Tetsushi Sakuma
- grid.257022.00000 0000 8711 3200Molecular Genetics Laboratory, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, 739-8526 Japan
| | - Takashi Yamamoto
- grid.257022.00000 0000 8711 3200Molecular Genetics Laboratory, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, 739-8526 Japan
| | - Sangwan Kim
- grid.177174.30000 0001 2242 4849Laboratory of Molecular Gene Technics, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581 Japan
| | - Kosuke Tashiro
- grid.177174.30000 0001 2242 4849Laboratory of Molecular Gene Technics, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581 Japan
| | - Satoru Kuhara
- grid.177174.30000 0001 2242 4849Laboratory of Molecular Gene Technics, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581 Japan
| | - Koichiro Gen
- Planning and Coordination Department, Fisheries Technology Institute, FRA, Nagasaki, 851-2213 Japan
| | - Atushi Fujiwara
- grid.410851.90000 0004 1764 1824Aquatic Breeding Division, Aquaculture Research Department, Fisheries Technology Institute, FRA, Mie, 516-0193 Japan
| | - Yukinori Kazeto
- Fisheries Technology Institute, Minamiizu Field Station, FRA, Shizuoka, 415-0156 Japan
| | - Takanori Kobayashi
- grid.410851.90000 0004 1764 1824Aquatic Breeding Division, Aquaculture Research Department, Fisheries Technology Institute, FRA, Kanagawa, 236-8648 Japan
| | - Michiya Matsuyama
- ABRIC, Faculty of Agriculture, Kyushu University, Fukuoka, 819-0395, Japan.
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Paralytic Shellfish Toxins in the Gastropod Concholepas concholepas: Variability, Toxin Profiles and Mechanisms for Toxicity Reduction. Mar Drugs 2023; 21:md21010044. [PMID: 36662217 PMCID: PMC9866859 DOI: 10.3390/md21010044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/29/2022] [Accepted: 01/03/2023] [Indexed: 01/11/2023] Open
Abstract
Harmful algal blooms of toxin-producing microalgae are recurrent in southern Chile. Paralytic shellfish poisoning (PSP) outbreaks pose the main threat to public health and the fishing industry in the Patagonian fjords. This study aims to increase understanding of the individual and spatial variability of PSP toxicity in the foot of Concholepas concholepas, Chile’s most valuable commercial benthic invertebrate species, extracted from the Guaitecas Archipelago in Chilean Patagonia. The objective is to determine the effect of pigment removal and freezing during the detoxification process. A total of 150 specimens (≥90 mm length) were collected from this area. The live specimens were transferred to a processing plant, where they were measured and gutted, the foot was divided into two equal parts, and pigment was manually removed from one of these parts. The PSP toxicity of each foot (edible tissue) was determined by mouse bioassay (MBA) and high-performance liquid chromatography with fluorescence detection and postcolumn oxidation (HPLC-FLD PCOX). The individual toxicity per loco, as the species is known locally, varied from <30 to 146 μg STX diHCL eq 100 g−1 (CV = 43.83%) and from 5.96 to 216.3 μg STX diHCL eq 100 g−1 (CV = 34.63%), using MBA and HPLC, respectively. A generalized linear model showed a negative relation between individual weight and toxicity. The toxicological profile showed a dominance of STX (>95%), neoSTX and GTX2. The removal of pigment produced a reduction in PSP toxicity of up to 90% and could represent a good detoxification tool moving forward. The freezing process in the muscle with pigment did not produce a clear pattern. There is a significant reduction (p < 0.05) of PSP toxicity via PCOX but not MBA. Furthermore, the study discusses possible management and commercialization implications of the findings regarding small-scale fisheries.
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Rodríguez-Villegas C, Figueroa RI, Pérez-Santos I, Molinet C, Saldías GS, Rosales SA, Álvarez G, Linford P, Díaz PA. Continental shelf off northern Chilean Patagonia: A potential risk zone for the onset of Alexandrium catenella toxic bloom? MARINE POLLUTION BULLETIN 2022; 184:114103. [PMID: 36115195 DOI: 10.1016/j.marpolbul.2022.114103] [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: 06/03/2022] [Revised: 09/01/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
Harmful Algal Blooms (HAB) pose a severe socio-economic problem worldwide. The dinoflagellate species Alexandrium catenella produces potent neurotoxins called saxitoxins (STXs) and its blooms are associated with the human intoxication named Paralytic Shellfish Poisoning (PSP). Knowing where and how these blooms originate is crucial to predict blooms. Most studies in the Chilean Patagonia, were focused on coastal areas, considering that blooms from the adjacent oceanic region are almost non-existent. Using a combination of field studies and modelling approaches, we first evaluated the role of the continental shelf off northern Chilean Patagonia as a source of A. catenella resting cysts, which may act as inoculum for their toxic coastal blooms. This area is characterized by a seasonal upwelling system with positive Ekman pumping during spring-summer, and by the presence of six major submarine canyons. We found out that these submarine canyons increase the vertical advection of bottom waters, and thus, significantly enhance the process of coastal upwelling. This is a previously unreported factor, among those involved in bloom initiation. This finding put this offshore area at high risk of resuspension of resting cysts of A. catenella. Here, we discuss in detail the physical processes promoting this resuspension.
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Affiliation(s)
- Camilo Rodríguez-Villegas
- Programa de Doctorado en Ciencias, Mención Conservación y Manejo de Recursos Naturales, Universidad de Los Lagos, Camino Chinquihue km 6, Puerto Montt, Chile; Centro i∼mar, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile; CeBiB, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile
| | - Rosa I Figueroa
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO-CSIC), Subida a Radio Faro 50, 36390 Vigo, Spain
| | - Iván Pérez-Santos
- Centro i∼mar, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile; Centro de Investigación Oceanográfica COPAS COASTAL, Universidad de Concepción, Concepción, Chile; Centro de Investigaciones en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
| | - Carlos Molinet
- Programa de Investigación Pesquera, Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile; Programa Integrativo, Centro Interdisciplinario para la Investigación Acuícola (INCAR), Concepción, Chile
| | - Gonzalo S Saldías
- Centro de Investigación Oceanográfica COPAS COASTAL, Universidad de Concepción, Concepción, Chile; Departamento de Física, Facultad de Ciencias, Universidad del Bío-Bío, Concepción, Chile; Instituto Milenio en Socio-Ecología Costera (SECOS), Santiago, Chile; Centro de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile
| | - Sergio A Rosales
- Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile
| | - Gonzalo Álvarez
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Coquimbo 1281, Chile; Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo 1281, Chile
| | - Pamela Linford
- Programa de Doctorado en Ciencias, Mención Conservación y Manejo de Recursos Naturales, Universidad de Los Lagos, Camino Chinquihue km 6, Puerto Montt, Chile
| | - Patricio A Díaz
- Centro i∼mar, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile; CeBiB, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile.
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Characteristics of Harmful Algal Species in the Coastal Waters of China from 1990 to 2017. Toxins (Basel) 2022; 14:toxins14030160. [PMID: 35324656 PMCID: PMC8951513 DOI: 10.3390/toxins14030160] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/06/2022] [Accepted: 01/07/2022] [Indexed: 01/31/2023] Open
Abstract
Harmful algal blooms (HABs) have occurred frequently in coastal waters of China, imposing negative effects on the marine ecological environment. A dataset of HABs and terrestrial runoff was collected and analyzed in this study, and factors responsible for HABs were further explored. Frequency and expansion of HABs peaked between 2001 and 2007, and although they have declined slightly since then, they have remained quite high. Frequency and accumulative area of HABs peaked in 2004–2005, and most occurred from April to August during these years. HABs occurred frequently in the Changjiang (Yangtze River) estuary, and Prorocentrum donghaiense, Noctiluca scientillans, Karenia mikimotoi, and Skeletonema costatum were the main algal species. The increases of eutrophication, the abnormal sea surface temperature caused by climate and ocean currents, and the species invasion caused by the discharge of ballast water may be important factors for the long-term outbreak of HABs in the Chinese coastal waters. These findings provide a better understanding of HABs in China, which will be helpful to further prevention and control.
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Oyaneder-Terrazas J, Figueroa D, Araneda OF, García C. Saxitoxin Group Toxins Accumulation Induces Antioxidant Responses in Tissues of Mytilus chilensis, Ameghinomya antiqua, and Concholepas concholepas during a Bloom of Alexandrium pacificum. Antioxidants (Basel) 2022; 11:392. [PMID: 35204273 PMCID: PMC8869173 DOI: 10.3390/antiox11020392] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/08/2022] [Accepted: 02/11/2022] [Indexed: 12/10/2022] Open
Abstract
Saxitoxin (STX) group toxins consist of a set of analogues which are produced by harmful algal blooms (HABs). During a HAB, filter-feeding marine organisms accumulate the dinoflagellates and concentrate the toxins in the tissues. In this study, we analyze the changes in antioxidant enzymes and oxidative damage in the bivalves Mytilus chilensis and Ameghinomya antiqua, and the gastropod Concholepas concholepas during a bloom of Alexandrium pacificum. The results show that during the exponential phase of the bloom bivalves show an increase in toxicity and activity of antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase, and glutathinoe reductase, p < 0.05), while in the gastropods, increased activity of antioxidant enzymes was associated with the bioaccumulation of toxins through the diet. At the end of the bloom, decreased activity of antioxidant enzymes in the visceral and non-visceral tissues was detected in the bivalves, with an increase in oxidative damage (p < 0.05), in which the latter is correlated with the detection of the most toxic analogues of the STX-group (r = 0.988). In conclusion, in areas with high incidence of blooms, shellfish show a high activity of antioxidants, however, during the stages involving the distribution and bioconversion of toxins, there is decreased activity of antioxidant enzymes resulting in oxidative damage.
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Affiliation(s)
- Javiera Oyaneder-Terrazas
- Laboratory of Marine Toxins, Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago 8380000, Chile; (J.O.-T.); (D.F.)
| | - Diego Figueroa
- Laboratory of Marine Toxins, Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago 8380000, Chile; (J.O.-T.); (D.F.)
| | - Oscar F. Araneda
- Integrative Laboratory of Biomechanics and Physiology of Effort, Kinesiology School, Faculty of Medicine, Universidad de Los Andes, Santiago 8320000, Chile;
| | - Carlos García
- Laboratory of Marine Toxins, Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago 8380000, Chile; (J.O.-T.); (D.F.)
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11
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Díaz PA, Álvarez G, Pizarro G, Blanco J, Reguera B. Lipophilic Toxins in Chile: History, Producers and Impacts. Mar Drugs 2022; 20:122. [PMID: 35200651 PMCID: PMC8874607 DOI: 10.3390/md20020122] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 02/01/2022] [Accepted: 02/02/2022] [Indexed: 01/27/2023] Open
Abstract
A variety of microalgal species produce lipophilic toxins (LT) that are accumulated by filter-feeding bivalves. Their negative impacts on human health and shellfish exploitation are determined by toxic potential of the local strains and toxin biotransformations by exploited bivalve species. Chile has become, in a decade, the world's major exporter of mussels (Mytilus chilensis) and scallops (Argopecten purpuratus) and has implemented toxin testing according to importing countries' demands. Species of the Dinophysis acuminata complex and Protoceratium reticulatum are the most widespread and abundant LT producers in Chile. Dominant D. acuminata strains, notwithstanding, unlike most strains in Europe rich in okadaic acid (OA), produce only pectenotoxins, with no impact on human health. Dinophysis acuta, suspected to be the main cause of diarrhetic shellfish poisoning outbreaks, is found in the two southernmost regions of Chile, and has apparently shifted poleward. Mouse bioassay (MBA) is the official method to control shellfish safety for the national market. Positive results from mouse tests to mixtures of toxins and other compounds only toxic by intraperitoneal injection, including already deregulated toxins (PTXs), force unnecessary harvesting bans, and hinder progress in the identification of emerging toxins. Here, 50 years of LST events in Chile, and current knowledge of their sources, accumulation and effects, are reviewed. Improvements of monitoring practices are suggested, and strategies to face new challenges and answer the main questions are proposed.
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Affiliation(s)
- Patricio A. Díaz
- Centro i~mar (CeBiB), Universidad de Los Lagos, Casilla 557, Puerto Montt 5480000, Chile;
| | - Gonzalo Álvarez
- Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile;
- Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo 17811421, Chile
| | - Gemita Pizarro
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Enrique Abello 0552, Punta Arenas 6200000, Chile;
| | - Juan Blanco
- Centro de Investigacións Mariñas (Xunta de Galicia), Apto. 13, 36620 Vilanova de Arousa, Pontevedra, Spain;
| | - Beatriz Reguera
- Centro Oceanográfico de Vigo (IEO, CSIC), Subida a Radio Faro 50, 36390 Vigo, Pontevedra, Spain
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12
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Yan T, Li XD, Tan ZJ, Yu RC, Zou JZ. Toxic effects, mechanisms, and ecological impacts of harmful algal blooms in China. HARMFUL ALGAE 2022; 111:102148. [PMID: 35016761 DOI: 10.1016/j.hal.2021.102148] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 11/08/2021] [Accepted: 11/17/2021] [Indexed: 06/14/2023]
Abstract
Over the last 30 years, harmful algal blooms (HABs) have occurred frequently in the coastal waters of China, resulting in financial losses of over 5.9 billion yuan (about 0.87 billion US dollars) due to massive fish and shellfish mortalities and negative impacts on tourism. To better understand HABs in China, herein we summarized bloom events with massive fish/shellfish mortalities and/or economic losses. Our results suggest that the diversity of HAB species has increased over the last 30 years, with the main causative species shifting from the raphidophyte Chattonella marina and dinoflagellates Gymnodinium spp. to various other species, including the dinoflagellates Karenia mikimotoi and Prorocentrum donghaiense, the haptophyte Phaeocystis globosa, and the pelagophyte Aureococcus anophagefferens. In addition, new types of HABs, such as macroalgal blooms, emerged with severe ecological impacts. We also reviewed the toxic effects, mechanisms, and ecological impacts of common HAB causative species in China. Analysis of the toxic effects of three types of harmful algae (toxin-producing, fish killing, and ecosystem disruptive algae) on marine organisms commonly found in China at different trophic levels revealed that HABs often had toxic effects on multiple organisms in addition to fish or shellfish, with species-specific impacts. Common mechanisms of intoxication include shifting environmental parameters, shellfish poisoning, reactive oxygen species, and haemolytic/cytotoxic toxins. The main mechanism appears to vary with the type of HAB species, and for some notorious algae such as K. mikimotoi and C. marina, further investigations are needed to identify their intoxication mechanism.
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Affiliation(s)
- Tian Yan
- Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong Province, 266071, China; Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, 266071, China; Centre for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China.
| | - Xiao-Dong Li
- Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong Province, 266071, China; Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, College of Animal Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China
| | - Zhi-Jun Tan
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
| | - Ren-Cheng Yu
- Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong Province, 266071, China; Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, 266071, China; Centre for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China
| | - Jing-Zhong Zou
- Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong Province, 266071, China.
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13
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Social-Environmental Conflicts in Chile: Is There Any Potential for an Ecological Constitution? SUSTAINABILITY 2021. [DOI: 10.3390/su132212701] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Social unrest is on the rise worldwide amid deepening inequalities, environmental degradation, and job crises worsened by increasing social-environmental conflicts. In Chile, a social revolt in 2019 resulted in a national referendum in 2020. An ample majority (78.3% vs. 21.7%) voted to draft a new constitution to replace the current constitution drawn up under dictatorship. The result led to the emergence and empowerment of several organizations demanding an “ecological constitution”. In this context, we aim to analyze: (1) the main social-environmental conflicts in Chile and how they are related to the country’s current constitution, and (2) the potential drafting of an ecological constitution that addresses these conflicts. Across different industries in Chile, we observed common problems that are intrinsically related to the current constitution. This relationship seems to be perceived by Chilean citizens since a survey carried out in May 2021 found 79% support for an ecological constitution. Moreover, 105 of the 155 delegates to the constitutional convention proposed three or more environmental principles to be included in the new constitution. A potential ecological constitution entails principles that would improve the current situation of social-environmental conflicts in Chile. Based on our analysis, we recommend the establishment of watershed-based “territorial rights” in the new Chilean constitution to improve sustainability and environmental justice.
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14
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Yarimizu K, Mardones JI, Paredes-Mella J, Norambuena-Subiabre L, Carrano CJ, Maruyama F. The effect of iron on Chilean Alexandrium catenella growth and paralytic shellfish toxin production as related to algal blooms. Biometals 2021; 35:39-51. [PMID: 34716889 PMCID: PMC8803708 DOI: 10.1007/s10534-021-00349-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 10/22/2021] [Indexed: 11/30/2022]
Abstract
The dinoflagellate Alexandrium catenella is a well-known paralytic shellfish toxin producer that forms harmful algal blooms (HABs) worldwide. Blooms of this species have repeatedly brought severe ecological and economic impacts to Chile, especially in the southern region, where the shellfish and salmon industries are world-famous. The mechanisms of such HABs have been intensively studied but are still unclear. Nutrient overloading is one of the often-discussed drivers for HABs. The present study used the A. catenella strain isolated from southern Chile to investigate how iron conditions could affect their growth and toxin production as related to HAB. Our results showed that an optimum concentration of iron was pivotal for proper A. catenella growth. Thus, while excess iron exerted a toxic effect, low iron media led to iron insufficiency and growth inhibition. In addition, the study shows that the degree of paralytic shellfish toxin production by A. catenella varied depending on the iron concentration in the culture media. The A. catenella strain from southern Chile produced GTX1-4 exclusively in the fmol cell−1 scale. Based on these findings, we suggest that including iron and paralytic shellfish toxin measurements in the fields can improve the current HAB monitoring and contribute to an understanding of A. catenella bloom dynamics in Chile.
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Affiliation(s)
- Kyoko Yarimizu
- Microbial Genomics and Ecology, Office of Academic Research and Industry-Government Collaboration, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511 Japan
| | - Jorge I. Mardones
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, 5480000 Puerto Montt, Chile
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile
| | - Javier Paredes-Mella
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, 5480000 Puerto Montt, Chile
| | - Luis Norambuena-Subiabre
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, 5480000 Puerto Montt, Chile
| | - Carl J. Carrano
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr., San Diego, CA 92182-1030 USA
| | - Fumito Maruyama
- Microbial Genomics and Ecology, Office of Academic Research and Industry-Government Collaboration, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511 Japan
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15
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Kershaw JL, Jensen SK, McConnell B, Fraser S, Cummings C, Lacaze JP, Hermann G, Bresnan E, Dean KJ, Turner AD, Davidson K, Hall AJ. Toxins from harmful algae in fish from Scottish coastal waters. HARMFUL ALGAE 2021; 105:102068. [PMID: 34303514 DOI: 10.1016/j.hal.2021.102068] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 05/24/2021] [Accepted: 06/09/2021] [Indexed: 06/13/2023]
Abstract
Harmful algal bloom events are increasing in a number of water bodies around the world with significant economic impacts on the aquaculture, fishing and tourism industries. As well as their potential impacts on human health, toxin exposure from harmful algal blooms (HABs) has resulted in widespread morbidity and mortality in marine life, including top marine predators. There is therefore a need for an improved understanding of the trophic transfer, and persistence of toxins in marine food webs. For the first time, the concentrations of two toxin groups of commercial and environmental importance, domoic acid (DA) and saxitoxin (including Paralytic Shellfish Toxin (PST) analogues), were measured in the viscera of 40 different fish species caught in Scotland between February and November, 2012 to 2019. Overall, fish had higher concentrations of DA compared to PSTs, with a peak in the summer / autumn months. Whole fish concentrations were highest in pelagic species including Atlantic mackerel and herring, key forage fish for marine predators including seals, cetaceans and seabirds. The highest DA concentrations were measured along the east coast of Scotland and in Orkney. PSTs showed highest concentrations in early summer, consistent with phytoplankton bloom timings. The detection of multiple toxins in such a range of demersal, pelagic and benthic fish prey species suggests that both the fish, and by extension, piscivorous marine predators, experience multiple routes of toxin exposure. Risk assessment models to understand the impacts of exposure to HAB toxins on marine predators therefore need to consider how chronic, low-dose exposure to multiple toxins, as well as acute exposure during a bloom, could lead to potential long-term health effects ultimately contributing to mortalities. The potential synergistic, neurotoxic and physiological effects of long-term exposure to multiple toxins require investigation in order to appropriately assess the risks of HAB toxins to fish as well as their predators.
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Affiliation(s)
- Joanna L Kershaw
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, KY16 8LB, UK; School of Biological and Marine Sciences, Faculty of Science and Engineering, University of Plymouth, PL4 8AA, UK.
| | - Silje-Kristin Jensen
- The Norwegian Directorate of Fisheries, Kystens Hus, Stortorget 1A, 9008 Tromsø, Norway
| | - Bernie McConnell
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, KY16 8LB, UK
| | - Shaun Fraser
- NAFC Marine Centre, University of the Highlands and Islands, Port Arthur, Scalloway, Shetland, ZE1 0UN, UK
| | - Caroline Cummings
- US Fish and Wildlife Service Alaska Region, 1011 East Tudor Road, Anchorage, Alaska, USA, 99503
| | | | | | - Eileen Bresnan
- Marine Laboratory, Marine Scotland Science, Aberdeen, AB119DB, UK
| | - Karl J Dean
- Cefas, Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, UK
| | - Andrew D Turner
- Cefas, Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, UK
| | - Keith Davidson
- Scottish Association for Marine Science, Scottish Marine Institute, Oban, PA37 1QA, UK
| | - Ailsa J Hall
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, KY16 8LB, UK
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16
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Mardones JI, Paredes J, Godoy M, Suarez R, Norambuena L, Vargas V, Fuenzalida G, Pinilla E, Artal O, Rojas X, Dorantes-Aranda JJ, Lee Chang KJ, Anderson DM, Hallegraeff GM. Disentangling the environmental processes responsible for the world's largest farmed fish-killing harmful algal bloom: Chile, 2016. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 766:144383. [PMID: 33421787 DOI: 10.1016/j.scitotenv.2020.144383] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/04/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
The dictyochophyte microalga Pseudochattonella verruculosa was responsible for the largest farmed fish mortality ever recorded in the world, with losses for the Chilean salmon industry amounting to US$ 800 M in austral summer 2016. Super-scale climatic anomalies resulted in strong vertical water column stratification that stimulated development of a dynamic P. verruculosa thin layer (up to 38 μg chl a L-1) for several weeks in Reloncaví Sound. Hydrodynamic modeling (MIKE 3D) indicated that the Sound had extremely low flushing rates (between 121 and 200 days) in summer 2016. Reported algal cell densities of 7000-20,000 cells mL-1 generated respiratory distress in fish that was unlikely due to low dissolved oxygen (permanently >4 mg L-1). Histological examination of salmon showed that gills were the most affected organ with significant tissue damage and circulatory disorders. It is possible that some of this damage was due to a diatom bloom that preceded the Pseudochattonella event, thereby rendering the fish more susceptible to Pseudochattonella. No correlation between magnitude of fish mortality and algal cell abundance nor fish age was evident. Algal cultures revealed rapid growth rates and high cell densities (up to 600,000 cells mL-1), as well as highly complex life cycle stages that can be easily overlooked in monitoring programs. In cell-based bioassays, Chilean P. verruculosa was only toxic to the RTgill-W1 cell line following exposures to high cell densities of lysed cells (>100,000 cells mL-1). Fatty acid profiles of a cultured strain showed elevated concentrations of potentially ichthyotoxic, long-chain polyunsaturated fatty acids (PUFAs) (69.7% ± 1.8%)- stearidonic (SDA, 18:4ω3-28.9%), and docosahexaenoic acid (DHA, 22:6ω3-22.3%), suggesting that lipid peroxidation may help to explain the mortalities, though superoxide production by Pseudochattonella was low (< 0.21 ± 0.19 pmol O2- cell-1 h-1). It therefore remains unknown what the mechanisms of salmon mortality were during the Pseudochattonella bloom. Multiple mitigation strategies were used by salmon farmers during the event, with only delayed seeding of juvenile fish into the cages and towing of cages to sanctuary sites being effective. Airlift pumping, used effectively against other fish-killing HABs in the US and Canada was not effective, perhaps because it brought subsurface layers of Pseudochattonella to the surface, or and it also may have lysed the fragile cells, rendering them more lethal. The present study highlights knowledge gaps and inefficiency of contingency plans by the fish farming industry to overcome future fish-killing algal blooms under future climate change scenarios. The use of new technologies based on molecular methods for species detection, good farm practices by fish farms, and possible mitigation strategies are discussed.
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Affiliation(s)
- Jorge I Mardones
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Puerto Montt, Chile; Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile.
| | - Javier Paredes
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Puerto Montt, Chile
| | - Marcos Godoy
- Centro de Investigaciones Biológicas Aplicadas (CIBA), Puerto Montt, Chile; Laboratorio de Biotecnología Aplicada, Facultad de Medicina Veterinaria, Sede de la Patagonia, Puerto Montt 5480000, Chile; Doctorado en acuicultura, Programa cooperativo Universidad de Chile, Universidad Católica del Norte, Pontificia Universidad Católica de Valparaíso, Chile
| | - Rudy Suarez
- Centro de Investigaciones Biológicas Aplicadas (CIBA), Puerto Montt, Chile; Laboratorio de Biotecnología Aplicada, Facultad de Medicina Veterinaria, Sede de la Patagonia, Puerto Montt 5480000, Chile; Magister en acuicultura, Universidad Católica del Norte, Coquimbo, Chile
| | - Luis Norambuena
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Puerto Montt, Chile
| | - Valentina Vargas
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Puerto Montt, Chile
| | - Gonzalo Fuenzalida
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Puerto Montt, Chile
| | - Elias Pinilla
- CTPA-Putemún, Instituto de Fomento Pesquero (IFOP), Castro, Chile
| | - Osvaldo Artal
- CTPA-Putemún, Instituto de Fomento Pesquero (IFOP), Castro, Chile
| | - Ximena Rojas
- Instituto Tecnológico del Salmón (INTESAL), Juan Soler Manfredini 41, Of. 1802, Puerto Montt, Chile
| | | | - Kim J Lee Chang
- CSIRO Ocean and Atmosphere, GPO Box 1538, Hobart, TAS 7001, Australia
| | - Donald M Anderson
- Biology Department, Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA, USA
| | - Gustaaf M Hallegraeff
- Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Australia
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17
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Rodríguez-Benito CV, Navarro G, Caballero I. Using Copernicus Sentinel-2 and Sentinel-3 data to monitor harmful algal blooms in Southern Chile during the COVID-19 lockdown. MARINE POLLUTION BULLETIN 2020; 161:111722. [PMID: 33039790 PMCID: PMC7544481 DOI: 10.1016/j.marpolbul.2020.111722] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/23/2020] [Accepted: 09/23/2020] [Indexed: 05/20/2023]
Abstract
During the southern summer of 2020, large phytoplankton blooms were detected using satellite technology in Chile (western Patagonia), where intensive salmonid aquaculture is carried out. Some harvesting sites recorded massive fish mortalities, which were associated with the presence of the dinoflagellate species Cochlodinium sp. The bloom included other phytoplankton species, as Lepidodinium chlorophorum, which persistently changed the colour of the ocean to green. These blooms coincided with the government-managed emergency lockdown due to the COVID-19 pandemic. Local in situ sampling was slowed down. However, imagery from the Copernicus programme allowed operational monitoring. This study shows the benefits of both Sentinel-3 and Sentinel-2 satellites in terms of their spectral, spatial and temporal capabilities for improved algal bloom monitoring. These novel tools, which can foster optimal decision-making, are available for delivering early alerts in situations of natural catastrophes and blockages, such as those occurred during the global COVID-19 lockdown.
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Affiliation(s)
| | - Gabriel Navarro
- Instituto de Ciencias Marinas de Andalucía (ICMAN), Consejo Superior de Investigaciones Científicas (CSIC), Puerto Real 11510, Cádiz, Spain
| | - Isabel Caballero
- Instituto de Ciencias Marinas de Andalucía (ICMAN), Consejo Superior de Investigaciones Científicas (CSIC), Puerto Real 11510, Cádiz, Spain.
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18
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Yarimizu K, Fujiyoshi S, Kawai M, Norambuena-Subiabre L, Cascales EK, Rilling JI, Vilugrón J, Cameron H, Vergara K, Morón-López J, Acuña JJ, Gajardo G, Espinoza-González O, Guzmán L, Jorquera MA, Nagai S, Pizarro G, Riquelme C, Ueki S, Maruyama F. Protocols for Monitoring Harmful Algal Blooms for Sustainable Aquaculture and Coastal Fisheries in Chile. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17207642. [PMID: 33092111 PMCID: PMC7589761 DOI: 10.3390/ijerph17207642] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/14/2020] [Accepted: 10/18/2020] [Indexed: 11/16/2022]
Abstract
Harmful algae blooms (HABs) cause acute effects on marine ecosystems due to their production of endogenous toxins or their enormous biomass, leading to significant impacts on local economies and public health. Although HAB monitoring has been intensively performed at spatiotemporal scales in coastal areas of the world over the last decades, procedures have not yet been standardized. HAB monitoring procedures are complicated and consist of many methodologies, including physical, chemical, and biological water sample measurements. Each monitoring program currently uses different combinations of methodologies depending on site specific purposes, and many prior programs refer to the procedures in quotations. HAB monitoring programs in Chile have adopted the traditional microscopic and toxin analyses but not molecular biology and bacterial assemblage approaches. Here we select and optimize the HAB monitoring methodologies suitable for Chilean geography, emphasizing on metabarcoding analyses accompanied by the classical tools with considerations including cost, materials and instrument availability, and easiness and efficiency of performance. We present results from a pilot study using the standardized stepwise protocols, demonstrating feasibility and plausibility for sampling and analysis for the HAB monitoring. Such specific instructions in the standardized protocol are critical obtaining quality data under various research environments involving multiple stations, different analysts, various time-points, and long HAB monitoring duration.
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Affiliation(s)
- Kyoko Yarimizu
- Office of Industry-Academia-Government and Community Collaboration, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan;
- Correspondence: (K.Y.); (F.M.); Tel.: +81-082-424-7048 (K.Y. & F.M.)
| | - So Fujiyoshi
- Office of Industry-Academia-Government and Community Collaboration, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan;
| | - Mikihiko Kawai
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshidanihonmatsu-cho, Kyoto 606-8501, Japan;
| | - Luis Norambuena-Subiabre
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, Puerto Montt 5480000, Chile; (L.N.-S.); (E.-K.C.); (J.V.); (O.E.-G.); (L.G.)
| | - Emma-Karin Cascales
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, Puerto Montt 5480000, Chile; (L.N.-S.); (E.-K.C.); (J.V.); (O.E.-G.); (L.G.)
| | - Joaquin-Ignacio Rilling
- Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Ave. Francisco Salazar 01145, Temuco 4811230, Chile; (J.-I.R.); (J.J.A.); (M.A.J.)
| | - Jonnathan Vilugrón
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, Puerto Montt 5480000, Chile; (L.N.-S.); (E.-K.C.); (J.V.); (O.E.-G.); (L.G.)
| | - Henry Cameron
- Centro de Bioinnovacion, Facultad de Ciencias del Mar y Recursos Biologicos, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (H.C.); (C.R.)
| | - Karen Vergara
- Laboratorio de Genética, Acuicultura & Biodiversidad, Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Osorno 5290000, Chile; (K.V.); (G.G.)
| | - Jesus Morón-López
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046, Japan; (J.M.-L.); (S.U.)
| | - Jacquelinne J. Acuña
- Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Ave. Francisco Salazar 01145, Temuco 4811230, Chile; (J.-I.R.); (J.J.A.); (M.A.J.)
| | - Gonzalo Gajardo
- Laboratorio de Genética, Acuicultura & Biodiversidad, Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Osorno 5290000, Chile; (K.V.); (G.G.)
| | - Oscar Espinoza-González
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, Puerto Montt 5480000, Chile; (L.N.-S.); (E.-K.C.); (J.V.); (O.E.-G.); (L.G.)
| | - Leonardo Guzmán
- Centro de Estudios de Algas Nocivas (CREAN), Instituto de Fomento Pesquero (IFOP), Padre Harter 547, Puerto Montt 5480000, Chile; (L.N.-S.); (E.-K.C.); (J.V.); (O.E.-G.); (L.G.)
| | - Milko A. Jorquera
- Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Ave. Francisco Salazar 01145, Temuco 4811230, Chile; (J.-I.R.); (J.J.A.); (M.A.J.)
| | - Satoshi Nagai
- Japan Fisheries Research and Education Agency, Fisheries Resources Institute, Fisheries Stock Assessment Center, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan;
| | - Gemita Pizarro
- Laboratorio de toxinas y fitoplancton, IFOP, Enrique Abello 0552, Punta Arenas 6200000, Chile;
| | - Carlos Riquelme
- Centro de Bioinnovacion, Facultad de Ciencias del Mar y Recursos Biologicos, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile; (H.C.); (C.R.)
| | - Shoko Ueki
- Institute of Plant Science and Resources, Okayama University, 2-20-1 Chuo, Kurashiki, Okayama 710-0046, Japan; (J.M.-L.); (S.U.)
| | - Fumito Maruyama
- Office of Industry-Academia-Government and Community Collaboration, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan;
- Correspondence: (K.Y.); (F.M.); Tel.: +81-082-424-7048 (K.Y. & F.M.)
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A Twitter-Lived Red Tide Crisis on Chiloé Island, Chile: What Can Be Obtained for Social-Ecological Research through Social Media Analysis? SUSTAINABILITY 2020. [DOI: 10.3390/su12208506] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Considering traditional research on social-ecological crises, new social media analysis, particularly Twitter data, contributes with supplementary exploration techniques. In this article, we argue that a social media approach to social-ecological crises can offer an actor-centered meaningful perspective on social facts, a depiction of the general dynamics of meaning making that takes place among actors, and a systemic view of actors’ communication before, during and after the crisis. On the basis of a multi-technique approach to Twitter data (TF-IDF, hierarchical clustering, egocentric networks and principal component analysis) applied to a red tide crisis on Chiloé Island, Chile, in 2016, the most significant red tide in South America ever, we offer a view on the boundaries and dynamics of meaning making in a social-ecological crisis. We conclude that this dynamics shows a permanent reflexive work on elucidating the causes and effects of the crisis that develops according to actors’ commitments, the sequence of events, and political conveniences. In this vein, social media analysis does not replace good qualitative research, it rather opens up supplementary possibilities for capturing meanings from the past that cannot be retrieved otherwise. This is particularly relevant for studying social-ecological crises and supporting collective learning processes that point towards increased resilience capacities and more sustainable trajectories in affected communities.
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