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Guo S, Li J, Yang X, Qin Y, Zhao Y, Wei J, Ma H, Yu Z, Zhao L, Zhang Y. Resistance of an intertidal oyster(Saccostrea mordax)to marine heatwaves and the implication for reef building. Sci Total Environ 2024; 928:172474. [PMID: 38621527 DOI: 10.1016/j.scitotenv.2024.172474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 02/01/2024] [Accepted: 04/12/2024] [Indexed: 04/17/2024]
Abstract
Marine heatwaves (MHWs) have a significant impact on intertidal bivalves and the ecosystems they sustain, causing the destruction of organisms' original habitats. Saccostrea mordax mainly inhabits the intertidal zone around the equator, exhibiting potential tolerance to high temperatures and maybe a species suitable for habitat restoration. However, an understanding about the tolerance mechanism of S. mordax to high temperatures is unclear. It is also unknown the extent to which S. mordax can tolerate repeated heatwaves of increasing intensity and frequency. Here, we simulated the effects of two scenarios of MHWs and measured the physiological and biochemical responses and gene expression spectrum of S. mordax. The predicted responses varied greatly across heatwaves, and no heatwave had a significant impact on the survival of S. mordax. Specifically, there were no statistically significant changes apparent in the standard metabolic rate and the activities of enzymes of the oyster during repeated heatwaves. S. mordax exposed to high-intensity heatwaves enhanced their standard metabolic rate to fuel essential physiological maintenance and increasing activity of SOD and expression of HSP70/90. These strategies are presumably at the expense of functions related to immunity and growth, as best exemplified by significant depressions in activities of enzymes (NaK, CaMg, T-ATP, and AKP) and expression levels of genes (Rab, eEF-2, HMGR, Rac1, SGK, Rab8, etc.). The performance status of S. mordax tends to improve by implementing a suite of less energy-costly compensatory mechanisms at various levels of biological organization when re-exposed to heatwaves. The adaptive abilities shown by S. mordax indicate that they can play a crucial role in the restoration of oyster reefs in tropical seas.
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Affiliation(s)
- Shuming Guo
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Jun Li
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Xiaogang Yang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Yanping Qin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Yuexin Zhao
- Dalian Ocean University, Dalian 116023, China
| | - Jinkuan Wei
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Haitao Ma
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Ziniu Yu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China
| | - Liqiang Zhao
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Guangdong Ocean University, Zhangjiang 524088, China.
| | - Yuehuan Zhang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Science, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; Hainan Provincial Key Laboratory of Tropical Marine Biology Technology, Sanya Marine Eco-environment Engineering Research Institute, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572024, China.
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Funesto EGM, Lewis AM, Turner AD, Cameron TC, Steinke M. Immediate and delayed effects of a heatwave and Prorocentrum lima ((Ehrenberg) Stein 1878) bloom on the toxin accumulation, physiology, and survival of the oyster Magallana gigas (Thunberg, 1793). Sci Total Environ 2023; 892:164485. [PMID: 37257593 DOI: 10.1016/j.scitotenv.2023.164485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/04/2023] [Accepted: 05/24/2023] [Indexed: 06/02/2023]
Abstract
Warming could facilitate the intensification of toxic algal blooms, two important stressors for marine organisms that are predicted to co-occur more frequently in the future. We investigated the immediate and delayed effects of a heatwave and a simulated bloom (3 × 106 cells L-1) of the diarrhetic shellfish toxin (DST)-producing benthic dinoflagellate Prorocentrum lima on the survival, physiology (oxygen consumption rate, condition index, immune parameters), and toxin accumulation in the Pacific rock oyster Magallana (Crassostrea) gigas. Oysters exposed to both stressors contained higher mean DST concentrations (mean ± 1 SE: 173.3 ± 19.78 μg kg-1 soft tissue) than those exposed to P. lima bloom alone (120.4 ± 20.90 μg kg-1) and exceeded the maximum permitted levels for human consumption. Exposure to individual stressors and their combination modified the physiology of M. gigas. Oysters exposed to heatwave alone had significantly higher oxygen consumption rates (0.7 ± 0.06 mg O2 h-1 g-1) than the control (0.3 ± 0.06 mg O2 h-1 g-1). However, this was not observed in oysters exposed to both heatwave and P. lima (0.5 ± 0.06 mg O2 h-1 g-1). This alteration of the metabolic response to warming in the presence of P. lima may affect the ability of rock oysters to adapt to environmental stressors (i.e., a heatwave) to ensure survival. Immunomodulation, through changes in total hemocyte count, was observed in oysters exposed to P. lima alone and in combination with warming. Individual stressors and their combination did not influence the condition index, but one mortality was recorded in oysters exposed to both stressors. The findings of this study highlight the vulnerability of rock oysters to the predicted increased frequency of heatwaves and toxic algal blooms, and the increased likelihood of shellfish containing higher than regulatory levels of DST in warming coasts.
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Affiliation(s)
- Ellen Grace M Funesto
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom; Department of Biology and Environmental Science, College of Science, University of the Philippines Cebu, Gorordo Avenue, Lahug, Cebu City 6000, Philippines.
| | - Adam M Lewis
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, United Kingdom
| | - Andrew D Turner
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, United Kingdom
| | - Tom C Cameron
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom
| | - Michael Steinke
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom
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Smith RS, Cheng SL, Castorani MCN. Meta-analysis of ecosystem services associated with oyster restoration. Conserv Biol 2023; 37:e13966. [PMID: 35686509 PMCID: PMC10087230 DOI: 10.1111/cobi.13966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 05/03/2022] [Accepted: 05/30/2022] [Indexed: 04/13/2023]
Abstract
Restoration of foundation species promises to reverse environmental degradation and return lost ecosystem services, but a lack of standardized evaluation across projects limits understanding of recovery, especially in marine systems. Oyster reefs are restored to reverse massive global declines and reclaim valuable ecosystem services, but the success of these projects has not been systematically and comprehensively quantified. We synthesized data on ecosystem services associated with oyster restoration from 245 pairs of restored and degraded reefs and 136 pairs of restored and reference reefs across 3500 km of U.S. Gulf of Mexico and Atlantic coastlines. On average, restoration was associated with a 21-fold increase in oyster production (mean log response ratio = 3.08 [95% confidence interval: 2.58-3.58]), 34-97% enhancement of habitat provisioning (mean community abundance = 0.51 [0.41-0.61], mean richness = 0.29 [0.19-0.39], and mean biomass = 0.69 [0.39-0.99]), 54% more nitrogen removal (mean = 0.43 [0.13-0.73]), and 89-95% greater sediment nutrients (mean = 0.67 [0.27-1.07]) and organic matter (mean = 0.64 [0.44-0.84]) relative to degraded habitats. Moreover, restored reefs matched reference reefs for these ecosystem services. Our results support the continued and expanded use of oyster restoration to enhance ecosystem services of degraded coastal systems and match many functions provided by reference reefs.
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Affiliation(s)
- Rachel S Smith
- Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA
| | - Selina L Cheng
- Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA
| | - Max C N Castorani
- Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA
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Shih YJ, Chen JS, Chen YJ, Yang PY, Kuo YJ, Chen TH, Hsu BM. Impact of heavy precipitation events on pathogen occurrence in estuarine areas of the Puzi River in Taiwan. PLoS One 2021; 16:e0256266. [PMID: 34398929 PMCID: PMC8366992 DOI: 10.1371/journal.pone.0256266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 08/03/2021] [Indexed: 12/03/2022] Open
Abstract
Pathogen populations in estuarine areas are dynamic, as they are subject to multiple natural and anthropogenic challenges. Heavy rainfall events bring instability to the aquatic environment in estuaries, causing changes in pathogen populations and increased environmental sanitation and public health concerns. In this study, we investigated the effects of heavy precipitation on the occurrence of pathogens in the Puzi River estuary, which is adjacent to the largest inshore oyster farming area in Taiwan. Our results indicated that Vibrio parahaemolyticus and adenovirus were the most frequently detected pathogens in the area. There was a significant difference (Mann-Whitney U test, p < 0.01) in water quality parameters, including total coliform, Escherichia coli, water temperature, turbidity, salinity, and dissolved oxygen, between groups with and without V. parahaemolyticus. In addition, the detection rate was negatively correlated with the average daily rainfall (r2 > 0.8). There was no significant difference between water quality parameters and the presence/absence of adenovirus, but a positive correlation was observed between the average daily rainfall and the detection rate of adenovirus (r2 ≥ 0.75). We conclude that heavy precipitation changes estuarine water quality, causing variations in microbial composition, including pathogens. As extreme weather events become more frequent due to climate change, the potential impacts of severe weather events on estuarine environments require further investigation.
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Affiliation(s)
- Yi-Jia Shih
- Fujian Provincial Key Laboratory of Marine Fishery Resources and Eco-environment, Fisheries College, Jimei University, Xiamen, China
- Department of Earth and Environmental Sciences, National Chung Cheng University, Chiayi, Taiwan
| | - Jung-Sheng Chen
- Department of Earth and Environmental Sciences, National Chung Cheng University, Chiayi, Taiwan
- Department of Medical Research, E-Da Hospital, Kaohsiung, Taiwan
| | - Yi-Jen Chen
- Department of Chest Division, Internal Medicine, Ditmanson Medical Foundation Chiayi Christian Hospital, Chiayi, Taiwan
| | - Pei-Yu Yang
- Department of Laboratory, Show Chwan Memorial Hospital, Changhua, Taiwan
- Department of Kinesiology, Health and Leisure, Chienkuo Technology University, Changhua City, Taiwan
| | - Yi-Jie Kuo
- Department of Orthopedic Surgery, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Tsung-Hsien Chen
- Department of Internal Medicine, Ditmanson Medical Foundation Chiayi Christian Hospital, Chiayi, Taiwan
| | - Bing-Mu Hsu
- Department of Earth and Environmental Sciences, National Chung Cheng University, Chiayi, Taiwan
- Center for Innovative on Aging Society (CIRAS), National Chung Cheng University, Chiayi, Taiwan
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5
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Pereira RRC, Scanes E, Gibbs M, Byrne M, Ross PM. Can prior exposure to stress enhance resilience to ocean warming in two oyster species? PLoS One 2020; 15:e0228527. [PMID: 32275675 PMCID: PMC7147797 DOI: 10.1371/journal.pone.0228527] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/13/2020] [Indexed: 11/17/2022] Open
Abstract
Securing economically and ecologically significant molluscs, as our oceans warm due to climate change, is a global priority. South eastern Australia receives warm water in a strengthening East Australia Current and so resident species are vulnerable to elevated temperature and marine heat waves. This study tested whether prior exposure to elevated temperature can enhance resilience of oysters to ocean warming. Two Australian species, the flat oyster, Ostrea angasi, and the Sydney rock oyster, Saccostrea glomerata, were obtained as adults and "heat shocked" by exposure to a dose of warm water in the laboratory. Oysters were then transferred to elevated seawater temperature conditions where the thermal outfall from power generation was used as a proxy to investigate the impacts of ocean warming. Shell growth, condition index, lipid content and survival of flat oysters and condition of Sydney rock oysters were all significantly reduced by elevated seawater temperature in the field. Flat oysters grew faster than Sydney rock oysters at ambient temperature, but their growth and survival was more sensitive to elevated temperature. "Stress inoculation" by heat shock did little to ameliorate the negative effects of increased temperature, although the survival of heat-shocked flat oysters was greater than non-heat shocked oysters. Further investigations are required to determine if early exposure to heat stress can enhance resilience of oysters to ocean warming.
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Affiliation(s)
- Roberta R. C. Pereira
- School of Life and Environmental Science, The University of Sydney, Camperdown, NSW, Australia
| | - Elliot Scanes
- School of Life and Environmental Science, The University of Sydney, Camperdown, NSW, Australia
| | - Mitchell Gibbs
- School of Life and Environmental Science, The University of Sydney, Camperdown, NSW, Australia
| | - Maria Byrne
- School of Life and Environmental Science, The University of Sydney, Camperdown, NSW, Australia
- School of Medical Sciences, The University of Sydney, Camperdown, NSW, Australia
| | - Pauline M. Ross
- School of Life and Environmental Science, The University of Sydney, Camperdown, NSW, Australia
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Sakalauskaite J, Plasseraud L, Thomas J, Albéric M, Thoury M, Perrin J, Jamme F, Broussard C, Demarchi B, Marin F. The shell matrix of the european thorny oyster, Spondylus gaederopus: microstructural and molecular characterization. J Struct Biol 2020; 211:107497. [PMID: 32220629 DOI: 10.1016/j.jsb.2020.107497] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/20/2020] [Accepted: 03/22/2020] [Indexed: 11/18/2022]
Abstract
Molluscs, the largest marine phylum, display extraordinary shell diversity and sophisticated biomineral architectures. However, mineral-associated biomolecules involved in biomineralization are still poorly characterised. We report the first comprehensive structural and biomolecular study of Spondylus gaederopus, a pectinoid bivalve with a peculiar shell texture. Used since prehistoric times, this is the best-known shell of Europe's cultural heritage. We find that Spondylus microstructure is very poor in mineral-bound organics, which are mostly intercrystalline and concentrated at the interface between structural layers. Using high-resolution liquid chromatography tandem mass spectrometry (LC-MS/MS) we characterized several shell protein fractions, isolated following different bleaching treatments. Several peptides were identified as well as six shell proteins, which display features and domains typically found in biomineralized tissues, including the prevalence of intrinsically disordered regions. It is very likely that these sequences only partially represent the full proteome of Spondylus, considering the lack of genomics data for this genus and the fact that most of the reconstructed peptides do not match with any known shell proteins, representing consequently lineage-specific sequences. This work sheds light onto the shell matrix involved in the biomineralization in spondylids. Our proteomics data suggest that Spondylus has evolved a shell-forming toolkit, distinct from that of other better studied pectinoids - fine-tuned to produce shell structures with high mechanical properties, while limited in organic content. This study therefore represents an important milestone for future studies on biomineralized skeletons and provides the first reference dataset for forthcoming molecular studies of Spondylus archaeological artifacts.
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Affiliation(s)
- Jorune Sakalauskaite
- Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Turin, Italy; Biogeosciences, UMR CNRS 6282, University of Burgundy-Franche-Comté (UBFC), 6 Boulevard Gabriel, 21000 Dijon, France.
| | - Laurent Plasseraud
- Institute of Molecular Chemistry, ICMUB UMR CNRS 6302, University of Burgundy-Franche-Comté (UBFC), 9 Avenue Alain Savary, 21000 Dijon, France
| | - Jérôme Thomas
- Biogeosciences, UMR CNRS 6282, University of Burgundy-Franche-Comté (UBFC), 6 Boulevard Gabriel, 21000 Dijon, France
| | - Marie Albéric
- Laboratoire Chimie de la Matière Condensée de Paris, UMR, CNRS 7574, Sorbonne Université, Place Jussieu 4, 75252 Paris, France
| | - Mathieu Thoury
- IPANEMA, CNRS, ministère de la Culture, UVSQ, USR3461, Université Paris-Saclay, F-91192 Gif-sur-Yvette, France
| | - Jonathan Perrin
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
| | - Frédéric Jamme
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
| | - Cédric Broussard
- 3P5 Proteomic Platform, University of Paris, Cochin Institute, INSERM, U1016, CNRS, UMR8104, F-75014 Paris, France
| | - Beatrice Demarchi
- Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Turin, Italy
| | - Frédéric Marin
- Biogeosciences, UMR CNRS 6282, University of Burgundy-Franche-Comté (UBFC), 6 Boulevard Gabriel, 21000 Dijon, France.
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7
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Ewere EE, Reichelt-Brushett A, Benkendorff K. Imidacloprid and formulated product impacts the fatty acids and enzymatic activities in tissues of Sydney rock oysters, Saccostrea glomerata. Mar Environ Res 2019; 151:104765. [PMID: 31353171 DOI: 10.1016/j.marenvres.2019.104765] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 07/19/2019] [Accepted: 07/21/2019] [Indexed: 06/10/2023]
Abstract
The use of imidacloprid (IMI) and its formulated products in agriculture is a risk to aquatic organisms due to deposition into waterways from runoff and aerial spraying. However, there is limited information on the potential effects of this pesticide on commercially important shellfish, such as oysters. We investigated the impacts of IMI and Spectrum 200SC (IMI formulation) on the activity of the enzymes Glutathione-S-transferase (GST), Catalase (CAT) and Acetylcholinesterase (AChE), in different oyster tissues including the gill, adductor muscle and digestive gland. We also investigated the condition index and fatty acid composition of the flesh of oysters after 2 weeks exposure. The concentrations of IMI in the different tissues was assessed using Liquid Chromatography-Mass Spectrometry (LC-MS) after QuEChERS extraction. Higher concentrations of IMI residues were detected in the adductor muscle of the oysters, followed by the gills and with the lowest amounts recovered from the digestive gland across all the concentrations tested. IMI and Spectrum 200SC significantly affected the gill AChE activity at 2 mg/L, but digestive gland CAT, and gill and digestive gland GST were impacted at environmentally relevant concentrations (0.01 and 0.05 mg/L). In the whole oyster, 2 weeks exposure to IMI (≥0.01 mg/L) resulted in a proportional increase in saturated fatty acids (SFA), altered the polyunsaturated fatty acid (PUFA) to SFA ratio and altered the omega 3 fatty acids (n-3) to omega 6 fatty acids (n-6) ratio, but there were no effects on the condition index of the oyster. Although the oysters responded differently to the formulated product, there was no consistent difference in the sublethal effects of analytical IMI and Spectrum 200SC. This study showed that exposure to IMI and Spectrum 200SC can significantly affect the biochemical processes and metabolites in oysters, with implications for food quality and safety.
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Affiliation(s)
- Endurance E Ewere
- Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia; Department of Animal and Environmental Biology, Faculty of Life Sciences, University of Benin, Benin City, Nigeria
| | - Amanda Reichelt-Brushett
- Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia
| | - Kirsten Benkendorff
- Marine Ecology Research Centre, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia.
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8
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Checa AG, Yáñez-Ávila ME, González-Segura A, Varela-Feria F, Griesshaber E, Schmahl WW. Bending and branching of calcite laths in the foliated microstructure of pectinoidean bivalves occurs at coherent crystal lattice orientation. J Struct Biol 2019; 205:7-17. [PMID: 30576768 DOI: 10.1016/j.jsb.2018.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 12/10/2018] [Accepted: 12/12/2018] [Indexed: 11/19/2022]
Abstract
Foliated calcite is widely employed by some important pteriomorph bivalve groups as a construction material. It is made from calcite laths, which are inclined at a low angle to the internal shell surface, although their arrangement is different among the different groups. They are strictly ordered into folia in the anomiids, fully independent in scallops, and display an intermediate arrangement in oysters. Pectinids have particularly narrow laths characterized by their ability to change their growth direction by bending or winding, as well as to bifurcate and polyfurcate. Electron backscatter analysis indicates that the c-axes of laths are at a high, though variable, angle to the growth direction, and that the laths grow preferentially along the projection of an intermediate axis between two a-axes, although they can grow in any intermediate direction. Their main surfaces are not particular crystallographic faces. Analyses done directly on the lath surfaces demonstrate that, during the bending/branching events, all crystallographic axes remain invariant. The growth flexibility of pectinid laths makes them an excellent space-filling material, well suited to level off small irregularities of the shell growth surface. We hypothesize that the exceptional ability of laths to change their direction may be promoted by the mode of growth of biogenic calcite, from a precursor liquid phase induced by organic molecules.
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Affiliation(s)
- Antonio G Checa
- Departamento de Estratigrafía y Paleontología, Universidad de Granada, 18071 Granada, Spain; Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, 18100 Armilla, Spain.
| | - María E Yáñez-Ávila
- Departamento de Estratigrafía y Paleontología, Universidad de Granada, 18071 Granada, Spain
| | | | - Francisco Varela-Feria
- Centro de Investigación, Tecnología e Innovación, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Erika Griesshaber
- Department für Geo- und Umweltwissenschaften, Ludwig-Maximilians-Universität München, 80333 München, Germany
| | - Wolfgang W Schmahl
- Department für Geo- und Umweltwissenschaften, Ludwig-Maximilians-Universität München, 80333 München, Germany
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9
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Liu Z, Yu P, Chen M, Cai M, Fan B, Lv W, Huang Y, Li Y, Zhao Y. Macrobenthic community characteristics and ecological health of a constructed intertidal oyster reef in the Yangtze Estuary, China. Mar Pollut Bull 2018; 135:95-104. [PMID: 30301120 DOI: 10.1016/j.marpolbul.2018.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/02/2018] [Accepted: 07/04/2018] [Indexed: 06/08/2023]
Abstract
Development of substrate organisms (oysters, barnacles) and the health of a monitored oyster reef were investigated in the Yangtze Estuary. Very low salinity suppressed oyster survival. Nevertheless, middle- to high-salinity significantly increased the abundance and biomass of substrate organisms, and macrobenthos species and diversity. Long-term variation in substrate organisms was steady after a major fluctuation, yet the macrobenthic community structure lagged behind that of oysters. Overall, the oyster reef was in a healthy state. The M-AMBI results showed that its ecological status under high-salinity was better than medium-salinity conditions. Redundancy analysis indicated these results were associated with changes in water salinity and substrate factors. Taken together, our results suggest this constructed intertidal oyster reef has had a positive effect on the community and health status of macrobenthos in the Yangtze Estuary. Further, these ecological benefits increased going from medium- to high-salinity waters, but were generally absent under low salinity.
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Affiliation(s)
- Zhiquan Liu
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Ping Yu
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Minghai Chen
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Mingqi Cai
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Bin Fan
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Weiwei Lv
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agriculture Sciences, Shanghai 201403, China
| | - Youhui Huang
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Yiming Li
- School of Life Science, East China Normal University, Shanghai 200241, China
| | - Yunlong Zhao
- School of Life Science, East China Normal University, Shanghai 200241, China.
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10
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Scanes E, Parker LM, O'Connor WA, Gibbs MC, Ross PM. Copper and ocean acidification interact to lower maternal investment, but have little effect on adult physiology of the Sydney rock oyster Saccostrea glomerata. Aquat Toxicol 2018; 203:51-60. [PMID: 30077126 DOI: 10.1016/j.aquatox.2018.07.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 07/26/2018] [Accepted: 07/26/2018] [Indexed: 06/08/2023]
Abstract
It remains unknown how molluscs will respond to oceans which are increasingly predicted to be warmer, more acidic, and heavily polluted. Ocean acidification and trace metals will likely interact to increase the energy demands of marine organisms, especially oysters. This study tested the interactive effect of exposure to elevated pCO2 and copper on the energetic demands of the Sydney rock oyster (Saccostrea glomerata) during reproductive conditioning and determined whether there were any positive or negative effects on their offspring. Oysters were exposed to elevated pCO2 (1000 μatm) and elevated copper (Cu 50 μg L-1 [0.787 μM]) in an orthogonal design for eight weeks during reproductive conditioning. After eight weeks, energetic demands on oysters were measured including standard metabolic rate (SMR), nitrogen excretion, molar oxygen to nitrogen (O:N) ratio, and pHe of adult oysters as well as the size and total lipid content of their eggs. To determine egg viability, the gametes were collected and fertilised from adult oysters, the percentage of embryos that had reached the trochophore stage after 24 h was recorded. Elevated pCO2 caused a lower extracellular pH and there was a greater O:N ratio in adult oysters exposed to copper. While the two stressors did not interact to cause significant effects on adult physiology, they did interact to reduce the size and lipid content of eggs indicating that energy demand on adult oysters was greater when both elevated pCO2 and copper were combined. Despite the lower energy, there were no negative effects on early embryonic development. In conclusion, elevated pCO2 can interact with metals and cause greater energetic demands on oysters; in response oysters may lower maternal investment to offspring.
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Affiliation(s)
- Elliot Scanes
- The University of Sydney, School of Life and Environmental Sciences, Camperdown, NSW, 2006, Australia; Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, NSW, 2316, Australia.
| | - Laura M Parker
- The University of Sydney, School of Life and Environmental Sciences, Camperdown, NSW, 2006, Australia
| | - Wayne A O'Connor
- Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, NSW, 2316, Australia
| | - Mitchell C Gibbs
- The University of Sydney, School of Life and Environmental Sciences, Camperdown, NSW, 2006, Australia
| | - Pauline M Ross
- The University of Sydney, School of Life and Environmental Sciences, Camperdown, NSW, 2006, Australia
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11
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Watts JC, Carroll JM, Munroe DM, Finelli CM. Examination of the potential relationship between boring sponges and pea crabs and their effects on eastern oyster condition. Dis Aquat Organ 2018; 130:25-36. [PMID: 30154269 DOI: 10.3354/dao03257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The eastern oyster Crassostrea virginica provides a number of ecosystem services and is an important commercial fishery species along the US East and Gulf Coasts. Oyster populations have declined dramatically due to overharvesting, habitat loss, and disease. As restoration efforts and aquaculture of oysters continue to increase throughout their range, it is important to consider the impacts of a number of potential oyster pests, including the boring sponge Cliona spp. and the pea crab Zaops (Pinnotheres) ostreum, on oyster populations. Both of these have been demonstrated to reduce oyster growth, condition, and in some instances, reproductive output. Boring sponges in particular are a major concern for oyster growers and managers. Our monitoring efforts have suggested that pea crabs might be more prevalent in sponge-infested oysters; we therefore conducted an observational study to determine if there was any relationship between pea crab prevalence and sponge presence, and to examine whether the presence of both pests had synergistic effects on oyster condition. At 2 very different sample sites, North Carolina and New Jersey, oysters with 1 pest (i.e. boring sponge) were significantly more likely to have the second pest (i.e. pea crab) than the background population. Furthermore, sponge presence negatively affected oyster condition in North Carolina only, while pea crabs significantly reduced condition at both locations. When sponges and pea crabs were present together, the effects on oyster condition were additive. This study provides further evidence that interactions between an individual and a fouling/pest organism can alter oyster susceptibility to other parasites.
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Affiliation(s)
- Jessica C Watts
- Department of Biology and Marine Biology, University of North Carolina Wilmington, NC 28403, USA
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12
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Jia Y, Yang B, Dong W, Liu Z, Lv Z, Jia Z, Qiu L, Wang L, Song L. A serotonin receptor (Cg5-HTR-1) mediating immune response in oyster Crassostrea gigas. Dev Comp Immunol 2018; 82:83-93. [PMID: 29305167 DOI: 10.1016/j.dci.2017.12.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 12/27/2017] [Accepted: 12/30/2017] [Indexed: 06/07/2023]
Abstract
Serotonin receptors, including ligand-gated ion channel (LGICs) and G protein-coupled receptors (GPCR), play vital roles in modulating physiological processes and immunoreaction. In the present study, a homologue of serotonin (5-HT) receptor was identified from oyster Crassostrea gigas (designated Cg5-HTR-1). Its open reading frame (ORF) was of 1239 bp, encoding a polypeptide of 412 amino acids with a seven transmembrane region. Cg5-HTR-1 shared high similarity with the 5-HTRs from other animals. The cAMP contents in HEK293T cells decreased significantly after Cg5-HTR-1 transfection and 5-HT incubation (p < .05), while blocking Cg5-HTR-1 with specific receptor antagonist reversed this downtrend. The intracellular Ca2+ concentrations increased significantly (p < .05) after cell transfection and 5-HT incubation, and the antagonist treatment also arrested this process. Cg5-HTR-1 transcripts were widely distributed in various tissues, with the highest level in hepatopancreas and lowest level in mantle and gill. The mRNA expression of Cg5-HTR-1 in hemocyte increased significantly after lipopolysaccharide (LPS) stimulation and reached the peak level (6.47-fold, p < .05) at 6 h post treatment. The inhibition of Cg5-HTR-1 significantly reduced the expression of tumor necrosis factor (TNF) mRNA in hemocyte, down-regulated the superoxide dismutase (SOD) activity in serum, and induced the apoptosis of hemocyte (p < .05). These results suggested that Cg5-HTR-1 was a novel member of 5-HT1 receptor family and it mediated serotonergic immunomodulation on both cellular and humoral immune responses.
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Affiliation(s)
- Yunke Jia
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bin Yang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenjing Dong
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhaoqun Liu
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China
| | - Zhao Lv
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhihao Jia
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Limei Qiu
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Lingling Wang
- Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China; Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China.
| | - Linsheng Song
- Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China; Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China
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13
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Song X, Xin X, Dong M, Wang W, Wang L, Song L. The ancient role for GATA2/3 transcription factor homolog in the hemocyte production of oyster. Dev Comp Immunol 2018; 82:55-65. [PMID: 29317231 DOI: 10.1016/j.dci.2018.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 01/05/2018] [Accepted: 01/05/2018] [Indexed: 06/07/2023]
Abstract
Hemocytes, the cellular component of invertebrate hemolymph, are essential for invertebrate immunity, but the hematopoiesis and regulation mechanism are still largely unknown. In the present study, a conserved hematopoietic transcription factor Cg-GATA2/3 was identified in Pacific oyster Crassotrea gigas, which was evolutionarily close to the vertebrate GATA1/2/3. Cg-GATA2/3 was mainly distributed in the immune organs, such as gill, hemocytes, and mantle. After Cg-GATA2/3 was interferenced by dsRNA, the mRNA expressions of hemocytes specific gene (EcSOD) and hematopoietic transcription factor (C-Myb) were all significant down-regulated, and the hemocyte renewal rates also decreased both in hemolymph and gill. During the larval developmental stages, the mRNA transcripts of Cg-GATA2/3 increased immediately after fertilization and kept a high level during blastula and early trochophore larvae stage (4-10 hpf, hours post fertilization), then decreased sharply in early D-veliger larvae stage (15 hpf). Whole-mount immunofluorescence assay further revealed that the abundant immunoreactivity of Cg-GATA2/3 was distributed in the whole body of blastula and gastrula embryos, while specialized gradually to a ring structure around the dorsal region in trochophore larvae. In the D-veliger and umbo larvae, scattered positive signals appeared in the specific sinus structure on the dorsal side and velum region. These results demonstrated that Cg-GATA2/3 was a hematopoietic lineage-specific transcription factor to regulate the hemocyte production, and it could also be used as hematopoietic specific marker to trace potential developmental events of hematopoiesis during ontogenesis of oyster.
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Affiliation(s)
- Xiaorui Song
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China
| | - Xiaoyu Xin
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China
| | - Miren Dong
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China
| | - Weilin Wang
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China
| | - Lingling Wang
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China
| | - Linsheng Song
- Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China; Laboratory of Marine Fisheries Science and Food Production Process, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian 116023, China.
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14
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Stapp LS, Parker LM, O'Connor WA, Bock C, Ross PM, Pörtner HO, Lannig G. Sensitivity to ocean acidification differs between populations of the Sydney rock oyster: Role of filtration and ion-regulatory capacities. Mar Environ Res 2018; 135:103-113. [PMID: 29428529 DOI: 10.1016/j.marenvres.2017.12.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/13/2017] [Accepted: 12/17/2017] [Indexed: 06/08/2023]
Abstract
Understanding mechanisms of intraspecific variation in resilience to environmental drivers is key to predict species' adaptive potential. Recent studies show a higher CO2 resilience of Sydney rock oysters selectively bred for increased growth and disease resistance ('selected oysters') compared to the wild population. We tested whether the higher resilience of selected oysters correlates with an increased ability to compensate for CO2-induced acid-base disturbances. After 7 weeks of exposure to elevated seawater PCO2 (1100 μatm), wild oysters had a lower extracellular pH (pHe = 7.54 ± 0.02 (control) vs. 7.40 ± 0.03 (elevated PCO2)) and increased hemolymph PCO2 whereas extracellular acid-base status of selected oysters remained unaffected. However, differing pHe values between oyster types were not linked to altered metabolic costs of major ion regulators (Na+/K+-ATPase, H+-ATPase and Na+/H+-exchanger) in gill and mantle tissues. Our findings suggest that selected oysters possess an increased systemic capacity to eliminate metabolic CO2, possibly through higher and energetically more efficient filtration rates and associated gas exchange. Thus, effective filtration and CO2 resilience might be positively correlated traits in oysters.
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Affiliation(s)
- Laura S Stapp
- Integrative Ecophysiology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany; University of Bremen, NW2, Leobener Strasse, 28359 Bremen, Germany.
| | - Laura M Parker
- School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia
| | - Wayne A O'Connor
- NSW Department of Primary Industries, Port Stephens Fisheries Centre, Taylors Beach, New South Wales 2316, Australia
| | - Christian Bock
- Integrative Ecophysiology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Pauline M Ross
- School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia
| | - Hans O Pörtner
- Integrative Ecophysiology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany; University of Bremen, NW2, Leobener Strasse, 28359 Bremen, Germany
| | - G Lannig
- Integrative Ecophysiology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
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15
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Abstract
Norovirus is a major cause of viral gastroenteritis, with shellfish consumption being identified as one potential norovirus entry point into the human population. Minimising shellfish norovirus levels is therefore important for both the consumer’s protection and the shellfish industry’s reputation. One method used to reduce microbiological risks in shellfish is depuration; however, this process also presents additional costs to industry. Providing a mechanism to estimate norovirus levels during depuration would therefore be useful to stakeholders. This paper presents a mathematical model of the depuration process and its impact on norovirus levels found in shellfish. Two fundamental stages of norovirus depuration are considered: (i) the initial distribution of norovirus loads within a shellfish population and (ii) the way in which the initial norovirus loads evolve during depuration. Realistic assumptions are made about the dynamics of norovirus during depuration, and mathematical descriptions of both stages are derived and combined into a single model. Parameters to describe the depuration effect and norovirus load values are derived from existing norovirus data obtained from U.K. harvest sites. However, obtaining population estimates of norovirus variability is time-consuming and expensive; this model addresses the issue by assuming a ‘worst case scenario’ for variability of pathogens, which is independent of mean pathogen levels. The model is then used to predict minimum depuration times required to achieve norovirus levels which fall within possible risk management levels, as well as predictions of minimum depuration times for other water-borne pathogens found in shellfish. Times for Escherichia coli predicted by the model all fall within the minimum 42 hours required for class B harvest sites, whereas minimum depuration times for norovirus and FRNA+ bacteriophage are substantially longer. Thus this study provides relevant information and tools to assist norovirus risk managers with future control strategies.
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Affiliation(s)
- Paul McMenemy
- Computing Science and Mathematics, Faculty of Natural Sciences, University of Stirling, United Kingdom
- Epidemiology Team, CEFAS, Weymouth, United Kingdom
- * E-mail:
| | - Adam Kleczkowski
- Computing Science and Mathematics, Faculty of Natural Sciences, University of Stirling, United Kingdom
| | | | | | - Nick Taylor
- Epidemiology Team, CEFAS, Weymouth, United Kingdom
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16
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Parker LM, O'Connor WA, Byrne M, Dove M, Coleman RA, Pörtner HO, Scanes E, Virtue P, Gibbs M, Ross PM. Ocean acidification but not warming alters sex determination in the Sydney rock oyster, Saccostrea glomerata. Proc Biol Sci 2018; 285:20172869. [PMID: 29445023 PMCID: PMC5829212 DOI: 10.1098/rspb.2017.2869] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 01/26/2018] [Indexed: 11/12/2022] Open
Abstract
Whether sex determination of marine organisms can be altered by ocean acidification and warming during this century remains a significant, unanswered question. Here, we show that exposure of the protandric hermaphrodite oyster, Saccostrea glomerata to ocean acidification, but not warming, alters sex determination resulting in changes in sex ratios. After just one reproductive cycle there were 16% more females than males. The rate of gametogenesis, gonad area, fecundity, shell length, extracellular pH and survival decreased in response to ocean acidification. Warming as a sole stressor slightly increased the rate of gametogenesis, gonad area and fecundity, but this increase was masked by the impact of ocean acidification at a level predicted for this century. Alterations to sex determination, sex ratios and reproductive capacity will have flow on effects to reduce larval supply and population size of oysters and potentially other marine organisms.
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Affiliation(s)
- Laura M Parker
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Wayne A O'Connor
- Port Stephens Fisheries Institute, NSW Department of Primary Industries, Taylors Beach, NSW 2316, Australia
| | - Maria Byrne
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
- School of Medical Science, The University of Sydney, Sydney, NSW 2006, Australia
| | - Michael Dove
- Port Stephens Fisheries Institute, NSW Department of Primary Industries, Taylors Beach, NSW 2316, Australia
| | - Ross A Coleman
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Hans-O Pörtner
- Alfred Wegener Institute for Polar and Marine Research in the Hermann von Helmholtz Association of National Research Centres e. V. (HGF), Am Handelshafen 12, Bremerhaven, Germany
| | - Elliot Scanes
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Patti Virtue
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia
| | - Mitchell Gibbs
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
| | - Pauline M Ross
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia
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17
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Abstract
There is an increasing concern that anthropogenic noise could have a significant impact on the marine environment, but there is still insufficient data for most invertebrates. What do they perceive? We investigated this question in oysters Magallana gigas (Crassostrea gigas) using pure tone exposures, accelerometer fixed on the oyster shell and hydrophone in the water column. Groups of 16 oysters were exposed to quantifiable waterborne sinusoidal sounds in the range of 10 Hz to 20 kHz at various acoustic energies. The experiment was conducted in running seawater using an experimental flume equipped with suspended loudspeakers. The sensitivity of the oysters was measured by recording their valve movements by high-frequency noninvasive valvometry. The tests were 3 min tone exposures including a 70 sec fade-in period. Three endpoints were analysed: the ratio of responding individuals in the group, the resulting changes of valve opening amplitude and the response latency. At high enough acoustic energy, oysters transiently closed their valves in response to frequencies in the range of 10 to <1000 Hz, with maximum sensitivity from 10 to 200 Hz. The minimum acoustic energy required to elicit a response was 0.02 m∙s-2 at 122 dBrms re 1 μPa for frequencies ranging from 10 to 80 Hz. As a partial valve closure cannot be differentiated from a nociceptive response, it is very likely that oysters detect sounds at lower acoustic energy. The mechanism involved in sound detection and the ecological consequences are discussed.
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Affiliation(s)
- Mohcine Charifi
- University of Bordeaux, EPOC, UMR 5805, Arcachon, France
- CNRS, EPOC, UMR 5805, Talence, France
- Unit of Research on Biological Rhythms, Neuroscience and Environment, Faculty of Science, Mohammed V-Agdal University, Rabat, Morocco
| | - Mohamedou Sow
- University of Bordeaux, EPOC, UMR 5805, Arcachon, France
- CNRS, EPOC, UMR 5805, Talence, France
| | - Pierre Ciret
- University of Bordeaux, EPOC, UMR 5805, Arcachon, France
- CNRS, EPOC, UMR 5805, Talence, France
| | - Soumaya Benomar
- Unit of Research on Biological Rhythms, Neuroscience and Environment, Faculty of Science, Mohammed V-Agdal University, Rabat, Morocco
| | - Jean-Charles Massabuau
- University of Bordeaux, EPOC, UMR 5805, Arcachon, France
- CNRS, EPOC, UMR 5805, Talence, France
- * E-mail:
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18
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Sarkar A, Bhagat J, Saha Sarker M, Gaitonde DCS, Sarker S. Evaluation of the impact of bioaccumulation of PAH from the marine environment on DNA integrity and oxidative stress in marine rock oyster (Saccostrea cucullata) along the Arabian sea coast. Ecotoxicology 2017; 26:1105-1116. [PMID: 28755287 DOI: 10.1007/s10646-017-1837-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/08/2017] [Indexed: 06/07/2023]
Abstract
Marine pollution due to oil spills is of great concern globally for their impact on the health of marine ecosystems. We assessed the genotoxic effects and oxidative stress due to genotoxic pollutants accumulated from the ambient marine environment in the tissues of marine rock oyster, Saccostrea cucullata along the Arabian Sea coast around Goa, India. The extent of DNA damage in S. cucullata was determined by comet assay as variation of comet parameter: mean % tail DNA along the coast with respect to that at the reference site (Tiracol, Goa, India). In addition, the oxidative stress responses of rock oysters exposed to marine pollutants such as polycyclic aromatic hydrocarbons (PAHs) were assessed as a function of variation in antioxidant enzyme activities such as glutathione-s-transferase (GST), catalase (CAT) and superoxide dismutase (SOD) along the coast. Spearman correlation analysis showed significant correlation between different components of PAHs (viz., 2-3-PAH, 4-6-PAH and oxy-PAH) in the tissues of the rock oysters and the antioxidant enzyme activities. The antioxidant enzyme activities in S. cucullata increased with increasing concentrations of PAHs in tissues in the following order of sampling sites: Tiracol < Arambol < Betul < Velsao. Among the PAHs, oxy-PAH was found to be most predominant in causing DNA damage in S. cucullata. These results provide an insight into environmental genotoxicity and oxidative stress induced by PAHs along the Arabian Sea coast, India.
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Affiliation(s)
- A Sarkar
- Chemical Oceanographic Division, CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
- Global Enviro-Care, Caranzalem, Kevnem, Goa, 403002, India.
| | - Jacky Bhagat
- Chemical Oceanographic Division, CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India
| | - Munmun Saha Sarker
- Global Enviro-Care, Caranzalem, Kevnem, Goa, 403002, India
- Rabindra Bharati University, Emerald Bower Campus, Kolkata, West Bengal, 700 050, India
| | - Dipak C S Gaitonde
- Global Enviro-Care, Caranzalem, Kevnem, Goa, 403002, India
- Department of Environmental Science, Government Polytechnic College, Panaji, Goa, 403001, India
| | - Subhodeep Sarker
- Clinical Division of Fish Medicine, University of Veterinary Medicine, Veterinaerplatz 1, 1210, Vienna, Austria.
- Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, The University of Sydney, Sydney, New South Wales, 2006, Australia.
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19
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Wasson K, Hughes BB, Berriman JS, Chang AL, Deck AK, Dinnel PA, Endris C, Espinoza M, Dudas S, Ferner MC, Grosholz ED, Kimbro D, Ruesink JL, Trimble AC, Vander Schaaf D, Zabin CJ, Zacherl DC. Coast-wide recruitment dynamics of Olympia oysters reveal limited synchrony and multiple predictors of failure. Ecology 2017; 97:3503-3516. [PMID: 27912012 DOI: 10.1002/ecy.1602] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 09/21/2016] [Indexed: 11/07/2022]
Abstract
Recruitment of new propagules into a population can be a critical determinant of adult density. We examined recruitment dynamics in the Olympia oyster (Ostrea lurida), a species occurring almost entirely in estuaries. We investigated spatial scales of interannual synchrony across 37 sites in eight estuaries along 2,500 km of Pacific North American coastline, predicting that high vs. low recruitment years would coincide among neighboring estuaries due to shared exposure to regional oceanographic factors. Such synchrony in recruitment has been found for many marine species and some migratory estuarine species, but has never been examined across estuaries in a species that can complete its entire life cycle within the same estuary. To inform ongoing restoration efforts for Olympia oysters, which have declined in abundance in many estuaries, we also investigated predictors of recruitment failure. We found striking contrasts in absolute recruitment rate and frequency of recruitment failure among sites, estuaries, and years. Although we found a positive relationship between upwelling and recruitment, there was little evidence of synchrony in recruitment among estuaries along the coast, and only limited synchrony of sites within estuaries, suggesting recruitment rates are affected more strongly by local dynamics within estuaries than by regional oceanographic factors operating at scales encompassing multiple estuaries. This highlights the importance of local wetland and watershed management for the demography of oysters, and perhaps other species that can complete their entire life cycle within estuaries. Estuaries with more homogeneous environmental conditions had greater synchrony among sites, and this led to the potential for estuary-wide failure when all sites had no recruitment in the same year. Environmental heterogeneity within estuaries may thus buffer against estuary-wide recruitment failure, analogous to the portfolio effect for diversity. Recruitment failure was correlated with lower summer water temperature, higher winter salinity, and shorter residence time: all indicators of stronger marine influence on estuaries. Recruitment failure was also more common in estuaries with limited networks of nearby adult oysters. Large existing oyster networks are thus of high conservation value, while estuaries that lack them would benefit from restoration efforts to increase the extent and connectivity of sites supporting oysters.
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Affiliation(s)
- Kerstin Wasson
- Elkhorn Slough National Estuarine Research Reserve, 1700 Elkhorn Road, Royal Oaks, California, 95064, USA
- Department of Ecology and Evolutionary Biology, University of California, 100 Shaffer Road, Santa Cruz, California, 95060, USA
| | - Brent B Hughes
- Department of Ecology and Evolutionary Biology, University of California, 100 Shaffer Road, Santa Cruz, California, 95060, USA
- Division of Marine Science and Conservation, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, 28516, USA
| | - John S Berriman
- Schmid College of Science and Technology, Department of Biological Sciences, Chapman University, Orange, California, 92866-1005, USA
- Department of Biological Science (MH-282), California State University, P.O. Box 6850, Fullerton, California, 92834-6850, USA
| | - Andrew L Chang
- Smithsonian Environmental Research Center, 3152 Paradise Drive, Tiburon, California, 94920, USA
- San Francisco Bay National Estuarine Research Reserve, 3152 Paradise Drive, Tiburon, California, 94920, USA
- Department of Environmental Science and Policy, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - Anna K Deck
- San Francisco Bay National Estuarine Research Reserve, 3152 Paradise Drive, Tiburon, California, 94920, USA
- Department of Environmental Science and Policy, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - Paul A Dinnel
- Skagit County Marine Resources Committee, 1800 Continental Place, Mount Vernon, Washington, 98273, USA
| | - Charlie Endris
- Elkhorn Slough National Estuarine Research Reserve, 1700 Elkhorn Road, Royal Oaks, California, 95064, USA
| | - Michael Espinoza
- Department of Biological Science (MH-282), California State University, P.O. Box 6850, Fullerton, California, 92834-6850, USA
| | - Sarah Dudas
- Vancouver Island University, 900 Fifth Street, Nanaimo, British Columbia, V9R 5S5, USA
| | - Matthew C Ferner
- San Francisco Bay National Estuarine Research Reserve, 3152 Paradise Drive, Tiburon, California, 94920, USA
| | - Edwin D Grosholz
- Department of Environmental Science and Policy, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - David Kimbro
- Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, Nahant, Massachusetts, 01908, USA
| | - Jennifer L Ruesink
- Department of Biology, University of Washington, Seattle, Washington, 98195-1800, USA
| | - Alan C Trimble
- Department of Biology, University of Washington, Seattle, Washington, 98195-1800, USA
| | - Dick Vander Schaaf
- The Nature Conservancy, 821 SE 14th Avenue, Portland, Oregon, 97214, USA
| | - Chela J Zabin
- Smithsonian Environmental Research Center, 3152 Paradise Drive, Tiburon, California, 94920, USA
- Department of Environmental Science and Policy, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - Danielle C Zacherl
- Department of Biological Science (MH-282), California State University, P.O. Box 6850, Fullerton, California, 92834-6850, USA
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20
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Yingprasertchai T, Yu RMK, O'Connor WA, Hopwood T, MacFarlane GR. Acclimatory processes are likely responsible for metal tolerance in oyster embryos. Mar Environ Res 2017; 127:49-61. [PMID: 28372811 DOI: 10.1016/j.marenvres.2017.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/17/2017] [Accepted: 03/21/2017] [Indexed: 06/07/2023]
Abstract
We aimed to determine if offspring of oysters from contaminated locations were more tolerant to metals, and whether this tolerance could be attributed to acclimation. Oysters from 10 estuaries were sampled, representing a gradient in metal contamination. Tolerance to metals of the F1 offspring from adults residing in these estuaries was assessed. Then, adults from these estuaries were translocated to a single estuary and their offspring tolerance reassessed. No linear relationship was found between the Cu concentrations of adults and their offspring's tolerance to Cu. A positive linear relationship was found between the Zn concentration of adults and the Zn EC50's of their offspring. Zn tolerance was lost after translocation. Zn EC50 values of offspring from transplanted adults bore no relation to the Zn EC50's of their location of origin. Thus the initial tolerance observed could be attributed to acclimation transferred to the F1 generation.
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Affiliation(s)
- Thanvapon Yingprasertchai
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia; Faculty of Science and Technology, Kanchanaburi Rajabhat University, Muang District, Kanchanaburi, 7100 Thailand
| | - Richard Man Kit Yu
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Wayne A O'Connor
- New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach, NSW 2316, Australia
| | - Tegan Hopwood
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Geoff R MacFarlane
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia.
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21
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Blomberg BN, Lebreton B, Palmer TA, Guillou G, Beseres Pollack J, Montagna PA. Does reef structure affect oyster food resources? A stable isotope assessment. Mar Environ Res 2017; 127:32-40. [PMID: 28336052 DOI: 10.1016/j.marenvres.2017.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 03/02/2017] [Accepted: 03/10/2017] [Indexed: 06/06/2023]
Abstract
As ecosystem engineers, oysters create and maintain structured habitat and can influence trophodynamics and benthic-pelagic coupling in the surrounding landscape. The physical reef structure and associated biotic parameters can affect the availability of food resources for oysters. Oysters and potential composite food sources - suspended particulate organic matter (SPOM) and surface sediment organic matter (SSOM) - were assessed using a dual stable isotope (δ13C, δ15N) approach at three reef types (natural, restored, and unconsolidated) seasonally for two years to determine if changes in physical and/or biotic parameters affected the relative availability and/or use of food resources by oysters. SPOM was more depleted in 13C (-24.2 ± 0.6‰, mean ± SD) than SSOM (-21.2 ± 0.8‰). SPOM composition is likely dominated by autochthonous phytoplankton production, while SSOM includes trapped phytoplankton and benthic microalgae. SSOM was used by oysters in increasing proportions relative to SPOM over time at all reef types. This temporal trend is likely due to increased oyster biomass over time, promoting enhanced microphytobenthos growth through feedback effects related to oyster biodeposits. Structural differences between reef types observed in this study had no effect on food resource availability and use by oysters, indicating strong bentho-pelagic coupling likely due to shallow depths as well as strong and consistent winds. This study provides insights for restoration of oyster reefs as it highlights that food resources used by oysters remain similar among reef types despite changes in abiotic and biotic parameters among habitats and over time.
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Affiliation(s)
- Brittany N Blomberg
- Harte Research Institute for Gulf of Mexico Studies, Texas A&M University - Corpus Christi, 6300 Ocean Drive, Unit 5869, Corpus Christi, TX 78412-5869, USA.
| | - Benoit Lebreton
- Institut du Littoral et de l'Environnement, Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
| | - Terence A Palmer
- Harte Research Institute for Gulf of Mexico Studies, Texas A&M University - Corpus Christi, 6300 Ocean Drive, Unit 5869, Corpus Christi, TX 78412-5869, USA.
| | - Gaël Guillou
- Institut du Littoral et de l'Environnement, Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
| | - Jennifer Beseres Pollack
- Department of Life Sciences, Texas A&M University - Corpus Christi, 6300 Ocean Drive, Unit 5800, Corpus Christi, TX 78412-5800, USA.
| | - Paul A Montagna
- Harte Research Institute for Gulf of Mexico Studies, Texas A&M University - Corpus Christi, 6300 Ocean Drive, Unit 5869, Corpus Christi, TX 78412-5869, USA.
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Rodriguez-Iruretagoiena A, Rementeria A, Zaldibar B, de Vallejuelo SFO, Gredilla A, Arana G, de Diego A. Is there a direct relationship between stress biomarkers in oysters and the amount of metals in the sediments where they inhabit? Mar Pollut Bull 2016; 111:95-105. [PMID: 27449829 DOI: 10.1016/j.marpolbul.2016.07.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/13/2016] [Accepted: 07/16/2016] [Indexed: 06/06/2023]
Abstract
The effects exerted by metals in oysters are still a matter of debate and require more detailed studies. In this work we have investigated whether the health status of oysters are affected by the amount of metals present in the sediments of their habitat. Sediments and oysters were collected in the tidal part of the estuary of the Oka River (Basque Country), representative of other mesotidal, well mixed and short estuaries of the European Atlantic coast. The concentrations of 14 elements were determined in all the samples. Several biomarkers were also measured in the soft tissues of oysters. According to the concentrations found, the sediments were classified as non-toxic or slightly toxic. In good agreement, the histological alterations observed in oysters were not severe. Interestingly, in those sampling sites where the sediments showed relatively high metal concentrations, the metallic content in oysters was lower, and vice versa.
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Affiliation(s)
- A Rodriguez-Iruretagoiena
- Department of Analytical Chemistry, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain.
| | - A Rementeria
- Department of Zoology & Animal Cell Biology, Cell Biology & Histology Lab, School of Science & Technology, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
| | - B Zaldibar
- Department of Zoology & Animal Cell Biology, Cell Biology & Histology Lab, School of Science & Technology, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
| | - S Fdez-Ortiz de Vallejuelo
- Department of Analytical Chemistry, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
| | - A Gredilla
- Department of Analytical Chemistry, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
| | - G Arana
- Department of Analytical Chemistry, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
| | - A de Diego
- Department of Analytical Chemistry, University of the Basque Country UPV/EHU, PO BOX 644, E-48080 Bilbao, Basque Country, Spain
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Raftos DA, Melwani AR, Haynes PA, Muralidharan S, Birch GF, Amaral V, Thompson EL, Taylor DA. The biology of environmental stress: molecular biomarkers in Sydney rock oysters (Saccostrea glomerata). Environ Sci Process Impacts 2016; 18:1129-1139. [PMID: 27548823 DOI: 10.1039/c6em00322b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This review describes our recent work on environmental stress in Sydney rock oysters, focusing on the identification of molecular biomarkers for ecotoxicological analysis. We begin by describing the environmental pressures facing coastal estuaries in Australia, with particular reference to Sydney Harbour. After providing that context, we summarise our transcriptional and proteomic analyses of Sydney rock oysters responding to chemical contamination and other forms of environmental stress. This work has shown that the intracellular processes of oysters are highly responsive to environmental threats. Our data agree with the broader literature, which suggests that there is a highly conserved intracellular stress response in oysters involving a limited number of biological processes. We conclude that many effective molecular markers for environmental biomonitoring are likely to lie within these biological pathways.
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Affiliation(s)
- D A Raftos
- Department of Biological Sciences, Macquarie University, Sydney Institute of Marine Science, North Ryde, 2109, NSW, Australia.
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Abstract
Theory predicts that monogamy is adaptive in resource-specialist symbiotic crustaceans inhabiting relatively small and morphologically simple hosts in tropical environments where predation risk away from hosts is high. We tested this prediction in Pontonia manningi, a hyper-symbiotic shrimp that dwells in the mantle cavity of the Atlantic winged oyster Pteria colymbus that, in turn, infects gorgonians from the genus Pseudopterogorgia in the Caribbean Sea. In agreement with theory, P. manningi were found dwelling as heterosexual pairs in oysters more frequently than expected by chance alone. Males and females also inhabited the same host individual independent of the female gravid condition or of the developmental stage of brooded embryos. While the observations above argue in favor of monogamy in P. manningi, there is evidence to suggest that males of the studied species are moderately promiscuous. That females found living solitary in oysters most often brooded embryos, and that males allocated more to weaponry (major claw size) than females at any given size suggest that males might be roaming among host individuals in search of and, fighting for, receptive females. All available information depicts a rather complex mating system in P. manningi: primarily monogamous but with moderately promiscuous males.
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Affiliation(s)
- J. Antonio Baeza
- Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, United States of America
- Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, Florida 34949, United States of America
- Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile
- * E-mail:
| | - Lunden Simpson
- Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, United States of America
| | - Louis J. Ambrosio
- Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, United States of America
| | - Rodrigo Guéron
- Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo - Campus Alegre, Espírito Santo, Brasil
| | - Nathalia Mora
- Departamento de Biología, Facultad de Ciencias, Universidad del Valle, Cali 760032, Colombia
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Sussarellu R, Suquet M, Thomas Y, Lambert C, Fabioux C, Pernet MEJ, Le Goïc N, Quillien V, Mingant C, Epelboin Y, Corporeau C, Guyomarch J, Robbens J, Paul-Pont I, Soudant P, Huvet A. Oyster reproduction is affected by exposure to polystyrene microplastics. Proc Natl Acad Sci U S A 2016; 113:2430-5. [PMID: 26831072 PMCID: PMC4780615 DOI: 10.1073/pnas.1519019113] [Citation(s) in RCA: 882] [Impact Index Per Article: 110.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Plastics are persistent synthetic polymers that accumulate as waste in the marine environment. Microplastic (MP) particles are derived from the breakdown of larger debris or can enter the environment as microscopic fragments. Because filter-feeder organisms ingest MP while feeding, they are likely to be impacted by MP pollution. To assess the impact of polystyrene microspheres (micro-PS) on the physiology of the Pacific oyster, adult oysters were experimentally exposed to virgin micro-PS (2 and 6 µm in diameter; 0.023 mg·L(-1)) for 2 mo during a reproductive cycle. Effects were investigated on ecophysiological parameters; cellular, transcriptomic, and proteomic responses; fecundity; and offspring development. Oysters preferentially ingested the 6-µm micro-PS over the 2-µm-diameter particles. Consumption of microalgae and absorption efficiency were significantly higher in exposed oysters, suggesting compensatory and physical effects on both digestive parameters. After 2 mo, exposed oysters had significant decreases in oocyte number (-38%), diameter (-5%), and sperm velocity (-23%). The D-larval yield and larval development of offspring derived from exposed parents decreased by 41% and 18%, respectively, compared with control offspring. Dynamic energy budget modeling, supported by transcriptomic profiles, suggested a significant shift of energy allocation from reproduction to structural growth, and elevated maintenance costs in exposed oysters, which is thought to be caused by interference with energy uptake. Molecular signatures of endocrine disruption were also revealed, but no endocrine disruptors were found in the biological samples. This study provides evidence that micro-PS cause feeding modifications and reproductive disruption in oysters, with significant impacts on offspring.
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Affiliation(s)
- Rossana Sussarellu
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Marc Suquet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Yoann Thomas
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Christophe Lambert
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Caroline Fabioux
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Marie Eve Julie Pernet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Nelly Le Goïc
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Virgile Quillien
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Christian Mingant
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Yanouk Epelboin
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Charlotte Corporeau
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Julien Guyomarch
- Centre de Documentation de Recherche d'Expérimentations, 29218 Brest, France
| | - Johan Robbens
- Instituut poor Landbouw en Visserijonderzoek, 8400 Ostend, Belgium
| | - Ika Paul-Pont
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Philippe Soudant
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Arnaud Huvet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France;
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26
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Sussarellu R, Suquet M, Thomas Y, Lambert C, Fabioux C, Pernet MEJ, Le Goïc N, Quillien V, Mingant C, Epelboin Y, Corporeau C, Guyomarch J, Robbens J, Paul-Pont I, Soudant P, Huvet A. Oyster reproduction is affected by exposure to polystyrene microplastics. Proc Natl Acad Sci U S A 2016. [PMID: 26831072 DOI: 10.1073/pnas.1519019113/-/dcsupplemental] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
Plastics are persistent synthetic polymers that accumulate as waste in the marine environment. Microplastic (MP) particles are derived from the breakdown of larger debris or can enter the environment as microscopic fragments. Because filter-feeder organisms ingest MP while feeding, they are likely to be impacted by MP pollution. To assess the impact of polystyrene microspheres (micro-PS) on the physiology of the Pacific oyster, adult oysters were experimentally exposed to virgin micro-PS (2 and 6 µm in diameter; 0.023 mg·L(-1)) for 2 mo during a reproductive cycle. Effects were investigated on ecophysiological parameters; cellular, transcriptomic, and proteomic responses; fecundity; and offspring development. Oysters preferentially ingested the 6-µm micro-PS over the 2-µm-diameter particles. Consumption of microalgae and absorption efficiency were significantly higher in exposed oysters, suggesting compensatory and physical effects on both digestive parameters. After 2 mo, exposed oysters had significant decreases in oocyte number (-38%), diameter (-5%), and sperm velocity (-23%). The D-larval yield and larval development of offspring derived from exposed parents decreased by 41% and 18%, respectively, compared with control offspring. Dynamic energy budget modeling, supported by transcriptomic profiles, suggested a significant shift of energy allocation from reproduction to structural growth, and elevated maintenance costs in exposed oysters, which is thought to be caused by interference with energy uptake. Molecular signatures of endocrine disruption were also revealed, but no endocrine disruptors were found in the biological samples. This study provides evidence that micro-PS cause feeding modifications and reproductive disruption in oysters, with significant impacts on offspring.
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Affiliation(s)
- Rossana Sussarellu
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Marc Suquet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Yoann Thomas
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Christophe Lambert
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Caroline Fabioux
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Marie Eve Julie Pernet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Nelly Le Goïc
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Virgile Quillien
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Christian Mingant
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Yanouk Epelboin
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Charlotte Corporeau
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Julien Guyomarch
- Centre de Documentation de Recherche d'Expérimentations, 29218 Brest, France
| | - Johan Robbens
- Instituut poor Landbouw en Visserijonderzoek, 8400 Ostend, Belgium
| | - Ika Paul-Pont
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Philippe Soudant
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France
| | - Arnaud Huvet
- Laboratoire des Sciences de l'Environnement Marin, UMR 6539 UBO-CNRS-Institute Français de Recherche pour l'Exploitation de la Mer-Institute de Recherche pour le Développement, 29280 Plouzané, France;
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27
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Hopkins GA, Prince M, Cahill PL, Fletcher LM, Atalah J. Desiccation as a mitigation tool to manage biofouling risks: trials on temperate taxa to elucidate factors influencing mortality rates. Biofouling 2016; 32:1-11. [PMID: 26691450 DOI: 10.1080/08927014.2015.1115484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The desiccation tolerance of biofouling taxa (adults and early life-stages) was determined under both controlled and 'realistic' field conditions. Adults of the ascidian Ciona spp. died within 24 h. Mortality in the adult blue mussel Mytilus galloprovincialis occurred within 11 d under controlled conditions, compared with 7 d when held outside. The Pacific oyster Crassostrea gigas was the most desiccation-tolerant taxon tested (up to 34 d under controlled conditions). Biofouling orientated to direct sunlight showed faster mortality rates for all the taxa tested. Mortality in Mytilus juveniles took up to 24 h, compared with 8 h for Ciona, with greater survival at the higher temperature (18.5°C) and humidity (~95% RH) treatment combination. This study demonstrated that desiccation can be an effective mitigation method for a broad range of fouling taxa, especially their early life-stages. Further work is necessary to assess risks from other high-risk species such as algae and cyst forming species.
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Affiliation(s)
- Grant A Hopkins
- a Coastal & Freshwater Group , Cawthron Institute , Nelson , New Zealand
| | - Madeleine Prince
- b School of Geography, Earth and Environmental Sciences , University of Birmingham , Birmingham , UK
| | - Patrick L Cahill
- a Coastal & Freshwater Group , Cawthron Institute , Nelson , New Zealand
| | - Lauren M Fletcher
- a Coastal & Freshwater Group , Cawthron Institute , Nelson , New Zealand
| | - Javier Atalah
- a Coastal & Freshwater Group , Cawthron Institute , Nelson , New Zealand
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Guo X, He Y, Zhang L, Lelong C, Jouaux A. Immune and stress responses in oysters with insights on adaptation. Fish Shellfish Immunol 2015; 46:107-119. [PMID: 25989624 DOI: 10.1016/j.fsi.2015.05.018] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Revised: 05/08/2015] [Accepted: 05/09/2015] [Indexed: 06/04/2023]
Abstract
Oysters are representative bivalve molluscs that are widely distributed in world oceans. As successful colonizers of estuaries and intertidal zones, oysters are remarkably resilient against harsh environmental conditions including wide fluctuations in temperature and salinity as well as prolonged air exposure. Oysters have no adaptive immunity but can thrive in microbe-rich estuaries as filter-feeders. These unique adaptations make oysters interesting models to study the evolution of host-defense systems. Recent advances in genomic studies including sequencing of the oyster genome have provided insights into oyster's immune and stress responses underlying their amazing resilience. Studies show that the oyster genomes are highly polymorphic and complex, which may be key to their resilience. The oyster genome has a large gene repertoire that is enriched for immune and stress response genes. Thousands of genes are involved in oyster's immune and stress responses, through complex interactions, with many gene families expanded showing high sequence, structural and functional diversity. The high diversity of immune receptors and effectors may provide oysters with enhanced specificity in immune recognition and response to cope with diverse pathogens in the absence of adaptive immunity. Some members of expanded immune gene families have diverged to function at different temperatures and salinities or assumed new roles in abiotic stress response. Most canonical innate immunity pathways are conserved in oysters and supported by a large number of diverse and often novel genes. The great diversity in immune and stress response genes exhibited by expanded gene families as well as high sequence and structural polymorphisms may be central to oyster's adaptation to highly stressful and widely changing environments.
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Affiliation(s)
- Ximing Guo
- Haskin Shellfish Research Laboratory, Department of Marine and Coastal Sciences, Rutgers University, Port Norris, NJ 08345, USA.
| | - Yan He
- Ministry of Education Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong 266003, China
| | - Linlin Zhang
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
| | - Christophe Lelong
- UMR BOREA, "Biologie des Organismes et Ecosystèmes Aquatiques", MNHN, UPMC, UCBN, CNRS-7208, IRD, Université de Caen Basse-Normandie, Esplanade de la Paix, 14032 Caen, France; Centre de Référence sur l'Huître (CRH), Université de Caen Basse Normandie, Esplanade de la Paix, 14032 Caen, France
| | - Aude Jouaux
- UMR BOREA, "Biologie des Organismes et Ecosystèmes Aquatiques", MNHN, UPMC, UCBN, CNRS-7208, IRD, Université de Caen Basse-Normandie, Esplanade de la Paix, 14032 Caen, France; Centre de Référence sur l'Huître (CRH), Université de Caen Basse Normandie, Esplanade de la Paix, 14032 Caen, France
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Farrell H, Seebacher F, O'Connor W, Zammit A, Harwood DT, Murray S. Warm temperature acclimation impacts metabolism of paralytic shellfish toxins from Alexandrium minutum in commercial oysters. Glob Chang Biol 2015; 21:3402-3413. [PMID: 26032975 DOI: 10.1111/gcb.12952] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 03/24/2015] [Indexed: 06/04/2023]
Abstract
Species of Alexandrium produce potent neurotoxins termed paralytic shellfish toxins and are expanding their ranges worldwide, concurrent with increases in sea surface temperature. The metabolism of molluscs is temperature dependent, and increases in ocean temperature may influence both the abundance and distribution of Alexandrium and the dynamics of toxin uptake and depuration in shellfish. Here, we conducted a large-scale study of the effect of temperature on the uptake and depuration of paralytic shellfish toxins in three commercial oysters (Saccostrea glomerata and diploid and triploid Crassostrea gigas, n = 252 per species/ploidy level). Oysters were acclimated to two constant temperatures, reflecting current and predicted climate scenarios (22 and 27 °C), and fed a diet including the paralytic shellfish toxin-producing species Alexandrium minutum. While the oysters fed on A. minutum in similar quantities, concentrations of the toxin analogue GTX1,4 were significantly lower in warm-acclimated S. glomerata and diploid C. gigas after 12 days. Following exposure to A. minutum, toxicity of triploid C. gigas was not affected by temperature. Generally, detoxification rates were reduced in warm-acclimated oysters. The routine metabolism of the oysters was not affected by the toxins, but a significant effect was found at a cellular level in diploid C. gigas. The increasing incidences of Alexandrium blooms worldwide are a challenge for shellfish food safety regulation. Our findings indicate that rising ocean temperatures may reduce paralytic shellfish toxin accumulation in two of the three oyster types; however, they may persist for longer periods in oyster tissue.
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Affiliation(s)
- Hazel Farrell
- School Plant Functional Ecology and Climate Change Cluster (C3), University of Technology Sydney, Ultimo, NSW, 2007, Australia
- Sydney Institute of Marine Sciences, Chowder Bay Rd, Mosman, NSW, 2088, Australia
- NSW Food Authority, 6 Avenue of the Americas, Newington, NSW, 2127, Australia
| | - Frank Seebacher
- Integrative Physiology, School of Biological Sciences, The University of Sydney, Heydon Laurence Building A08, Sydney, NSW, 2006, Australia
| | - Wayne O'Connor
- Department of Primary Industries, Port Stephens Fisheries Institute, Locked Bag 1, Nelson Bay, NSW, 2315, Australia
| | - Anthony Zammit
- NSW Food Authority, 6 Avenue of the Americas, Newington, NSW, 2127, Australia
| | - D Tim Harwood
- Cawthron Institute, Private Bag 2, Nelson, 7010, New Zealand
| | - Shauna Murray
- School Plant Functional Ecology and Climate Change Cluster (C3), University of Technology Sydney, Ultimo, NSW, 2007, Australia
- Sydney Institute of Marine Sciences, Chowder Bay Rd, Mosman, NSW, 2088, Australia
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Parker LM, O’Connor WA, Raftos DA, Pörtner HO, Ross PM. Persistence of Positive Carryover Effects in the Oyster, Saccostrea glomerata, following Transgenerational Exposure to Ocean Acidification. PLoS One 2015; 10:e0132276. [PMID: 26147612 PMCID: PMC4493068 DOI: 10.1371/journal.pone.0132276] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 06/11/2015] [Indexed: 11/19/2022] Open
Abstract
Ocean acidification (OA) is predicted to have widespread implications for marine organisms, yet the capacity for species to acclimate or adapt over this century remains unknown. Recent transgenerational studies have shown that for some marine species, exposure of adults to OA can facilitate positive carryover effects to their larval and juvenile offspring that help them to survive in acidifying oceanic conditions. But whether these positive carryover effects can persist into adulthood or the next generation is unknown. Here we tested whether positive carryover effects found in larvae of the oyster, Saccostrea glomerata following transgenerational exposure to elevated CO2, could persist into adulthood and whether subsequent transgenerational exposure of adults to elevated CO2 would facilitate similar adaptive responses in the next generation of larvae and juveniles. Following our previous transgenerational exposure of parental adults and first generation (F1) larvae to ambient (385 μatm) and elevated (856 μatm) CO2, newly settled F1 juveniles were transferred to the field at ambient CO2 for 14 months, until they reached reproductive maturity. At this time, the F1 adults were returned to the laboratory and the previous transgenerational CO2 exposure was repeated to produce F2 offspring. We found that the capacity of adults to regulate extracellular pH at elevated CO2 was improved if they had a prior history of transgenerational exposure to elevated CO2. In addition, subsequent transgenerational exposure of these adults led to an increase in the resilience of their larval and juvenile offspring. Offspring with a history of transgenerational exposure to elevated CO2 had a lower percentage abnormality, faster development rate, faster shell growth and increased heart rate at elevated CO2 compared with F2 offspring with no prior history of exposure to elevated CO2. Our results suggest that positive carryover effects originating during parental and larval exposure will be important in mediating some of the impacts of OA for later life-history stages and generations.
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Affiliation(s)
- Laura M. Parker
- School of Science and Health, University of Western Sydney, Hawkesbury K12, Locked Bag 1797, Penrith South DC 2751, Sydney, New South Wales, Australia
| | - Wayne A. O’Connor
- NSW Department of Primary Industries, Port Stephens Fisheries Centre, Taylors Beach, New South Wales, Australia
| | - David A. Raftos
- Department of Biological Sciences, Macquarie University, North Ryde, New South Wales, Australia
| | - Hans-Otto Pörtner
- Alfred Wegener Institute for Polar and Marine Research in the Hermann von Helmholtz Association of National Research Centres e. V. (HGF), Am Handelshafen 12, Bremerhaven, Germany
| | - Pauline M. Ross
- School of Science and Health, University of Western Sydney, Hawkesbury K12, Locked Bag 1797, Penrith South DC 2751, Sydney, New South Wales, Australia
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Anderson K, Taylor DA, Thompson EL, Melwani AR, Nair SV, Raftos DA. Meta-analysis of studies using suppression subtractive hybridization and microarrays to investigate the effects of environmental stress on gene transcription in oysters. PLoS One 2015; 10:e0118839. [PMID: 25768438 PMCID: PMC4358831 DOI: 10.1371/journal.pone.0118839] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 01/15/2015] [Indexed: 12/29/2022] Open
Abstract
Many microarray and suppression subtractive hybridization (SSH) studies have analyzed the effects of environmental stress on gene transcription in marine species. However, there have been no unifying analyses of these data to identify common stress response pathways. To address this shortfall, we conducted a meta-analysis of 14 studies that investigated the effects of different environmental stressors on gene expression in oysters. The stressors tested included chemical contamination, hypoxia and infection, as well as extremes of temperature, pH and turbidity. We found that the expression of over 400 genes in a range of oyster species changed significantly after exposure to environmental stress. A repeating pattern was evident in these transcriptional responses, regardless of the type of stress applied. Many of the genes that responded to environmental stress encoded proteins involved in translation and protein processing (including molecular chaperones), the mitochondrial electron transport chain, anti-oxidant activity and the cytoskeleton. In light of these findings, we put forward a consensus model of sub-cellular stress responses in oysters.
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Affiliation(s)
- Kelli Anderson
- Sydney Institute of Marine Science, Chowder Bay, NSW, Australia
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Daisy A. Taylor
- Sydney Institute of Marine Science, Chowder Bay, NSW, Australia
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Emma L. Thompson
- Sydney Institute of Marine Science, Chowder Bay, NSW, Australia
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Aroon R. Melwani
- Sydney Institute of Marine Science, Chowder Bay, NSW, Australia
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Sham V. Nair
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - David A. Raftos
- Sydney Institute of Marine Science, Chowder Bay, NSW, Australia
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
- * E-mail:
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Yamamoto T, Kim KH, Shirono K. A pilot study on remediation of sediments enriched by oyster farming wastes using granulated coal ash. Mar Pollut Bull 2015; 90:54-59. [PMID: 25480153 DOI: 10.1016/j.marpolbul.2014.11.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 11/10/2014] [Accepted: 11/17/2014] [Indexed: 06/04/2023]
Abstract
In order to evaluate the ability of granulated coal ash (GCA), a byproduct of coal thermal electric power stations, to remove hydrogen sulfide from organically enriched sediments, a pilot study was carried out at oyster farming sites, where sediments were enriched with oyster feces and dead oysters. Concentration of hydrogen sulfide in the interstitial water of the sediment decreased to nearly zero in both experimental sites, whereas it remained over 0.2mg/l in the control site. Concentration of acid volatile sulfide (AVS) in the sediment also decreased significantly in both experimental sites, while remained over 0.4 mg/g in the control site. Increases were observed in both the number of benthic microalgae species and the individual number of benthic animals in the surface sediments. This may have been due to the decrease in hydrogen sulfide.
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Affiliation(s)
- T Yamamoto
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan
| | - K H Kim
- Department of Ocean Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
| | - K Shirono
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan
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33
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Mineur F, Le Roux A, Maggs CA, Verlaque M. Positive feedback loop between introductions of non-native marine species and cultivation of oysters in Europe. Conserv Biol 2014; 28:1667-1676. [PMID: 25047099 DOI: 10.1111/cobi.12363] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2012] [Accepted: 03/14/2014] [Indexed: 06/03/2023]
Abstract
With globalization, agriculture and aquaculture activities are increasingly affected by diseases that are spread through movement of crops and stock. Such movements are also associated with the introduction of non-native species via hitchhiking individual organisms. The oyster industry, one of the most important forms of marine aquaculture, embodies these issues. In Europe disease outbreaks affecting cultivated populations of the naturalized oyster Crassostrea gigas caused a major disruption of production in the late 1960s and early 1970s. Mitigation procedures involved massive imports of stock from the species' native range in the northwestern Pacific from 1971 to 1977. We assessed the role stock imports played in the introduction of non-native marine species (including pathogens) from the northwestern Pacific to Europe through a methodological and critical appraisal of record data. The discovery rate of non-native species (a proxy for the introduction rate) from 1966 to 2012 suggests a continuous vector activity over the entire period. Disease outbreaks that have been affecting oyster production since 2008 may be a result of imports from the northwestern Pacific, and such imports are again being considered as an answer to the crisis. Although successful as a remedy in the short and medium terms, such translocations may bring new diseases that may trigger yet more imports (self-reinforcing or positive feedback loop) and lead to the introduction of more hitchhikers. Although there is a legal framework to prevent or reduce these introductions, existing procedures should be improved.
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Affiliation(s)
- Frederic Mineur
- School of Biological Sciences/Institute for Global Food Security, Queen's University of Belfast, Belfast, BT9 7BL, United Kingdom; Phycology Research Group, Ghent University, 9000 Gent, Belgium.
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Gong PH, Li J, Guan CT, Li MJ, Liu C. [Estimation and experiment of carbon sequestration by oysters attached to the enhancement artificial reefs in Laizhou Bay, Shandong, China]. Ying Yong Sheng Tai Xue Bao 2014; 25:3032-3038. [PMID: 25796916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Through sampling investigation of fouling organisms on the enhancement artificial reefs set up in Laizhou Bay, it was proved that oyster (Ostrea plicatula) was the dominant fouling species. Therefore the dry mass of shell (Ms), total fresh mass (Mt) and thickness (T) of oyster attached on the reefs were analyzed. The results showed that the Mt and Ms presented seasonal variation (P < 0.01), that is, the values were the lowest in April and the highest in December. The reef age and the length of the time the enhancement reefs placed in the sea had significant effect on Mt, Ms and T. With the increment of reef ages, all indices increased obviously. The carbon sinks of oysters attaching to the tube enhancement reefs constructed in 2009, 2010 and 2011 in Laizhou Bay were 17.61, 16.33 and 10.45 kg · m(-3), respectively. The oysters on the enhancement reefs of Jincheng marine ranch with an area of 64.25 hm2 had fixed carbon of 297.5 t C (equivalent to 1071 t of CO2) from 2009 to 2013 in Laizhou Bay. To capture and store the same amount of CO2 would cost about 1.6 x 10(5)-6.4 x 10(5) US dollars. Therefore, oysters attaching to the enhancement reefs bring about remarkable ecological benefits.
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Uchimura Y, Yamashita H, Kuramoto M, Ishihara K, Sugimoto M, Nakajima N. Damage to Cultivated Japanese Pearl Oysters by Oxidative Stress That Was Related to “Mass Mortality”. Biosci Biotechnol Biochem 2014; 67:2470-3. [PMID: 14646212 DOI: 10.1271/bbb.67.2470] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Increased blood-DNA breakage was observed in diseased pearl oysters. They showed significant formation of 8-hydroxydeoxyguanosine (8-OHdG) and malondialdehyde (MDA), whereas the oysters that had a low mortality rate from the disease had high activity of superoxide dismutase (SOD) and low amounts of 8-OHdG and MDA. These results suggest that radical damage had occurred only in the diseased pearl oysters with the cytolysis of their haemocytes, which was related to the mass mortality of the Japanese pearl oysters.
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Affiliation(s)
- Yuushi Uchimura
- Ehime Prefectural Fisheries Experimental Station., Uwajima, Ehime, Japan
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36
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Park K, Powers SP, Bosarge GS, Jung HS. Plugging the leak: barrier island restoration following Hurricane Katrina enhances larval retention and improves salinity regime for oysters in Mobile Bay, Alabama. Mar Environ Res 2014; 94:48-55. [PMID: 24369962 DOI: 10.1016/j.marenvres.2013.12.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 11/09/2013] [Accepted: 12/09/2013] [Indexed: 06/03/2023]
Abstract
Changes in geomorphology of estuaries are common following major perpetuations such as hurricanes and may have profound impacts on biological systems. Hurricane Katrina in 2005 created a new pass, called Katrina Cut, halving Dauphin Island in Mobile Bay, Alabama. Significant decline in oyster population at Cedar Point Reef, the primary oyster harvest grounds in Mobile Bay, had persisted since then until the Cut was artificially closed in 2010. A bio-physical model for hydrodynamics and oyster larval transport was used to evaluate two potential mechanisms responsible for oyster population declines: salinity changes in the context of oyster habitat suitability and retention of oyster larvae. The model results revealed that when open Katrina Cut increased salinity at Cedar Point Reef. During high freshwater discharge, in particular, water exchange through Katrina Cut increased the bottom salinity from <5 psu to well over 15 (sometimes >20) psu during the tropic tides. Elevated salinities are associated with greater predation on oysters and higher disease incidence. The presence of the Katrina Cut also reduced larval retention in the spawning area regardless of tidal or river discharge conditions. We conclude that closing the Cut likely improved conditions for oysters within Mobile Bay and eastern Mississippi Sound and that these improved conditions have contributed to increased oyster landings.
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Affiliation(s)
- Kyeong Park
- Department of Marine Sciences, University of South Alabama, Dauphin Island Sea Lab, 101 Bienville Blvd., Dauphin Island, AL 36528, USA.
| | - Sean P Powers
- Department of Marine Sciences, University of South Alabama, Dauphin Island Sea Lab, 101 Bienville Blvd., Dauphin Island, AL 36528, USA
| | - George S Bosarge
- Department of Marine Sciences, University of South Alabama, Dauphin Island Sea Lab, 101 Bienville Blvd., Dauphin Island, AL 36528, USA
| | - Hoon-Shin Jung
- The Water Institute of the Gulf, 301 N. Manin St., Ste. 2000, Baton Rouge, LA 70825, USA
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Pernet F, Lagarde F, Jeannée N, Daigle G, Barret J, Le Gall P, Quere C, D’orbcastel ER. Spatial and temporal dynamics of mass mortalities in oysters is influenced by energetic reserves and food quality. PLoS One 2014; 9:e88469. [PMID: 24551106 PMCID: PMC3925110 DOI: 10.1371/journal.pone.0088469] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 01/08/2014] [Indexed: 11/18/2022] Open
Abstract
Although spatial studies of diseases on land have a long history, far fewer have been made on aquatic diseases. Here, we present the first large-scale, high-resolution spatial and temporal representation of a mass mortality phenomenon cause by the Ostreid herpesvirus (OsHV-1) that has affected oysters (Crassostrea gigas) every year since 2008, in relation to their energetic reserves and the quality of their food. Disease mortality was investigated in healthy oysters deployed at 106 locations in the Thau Mediterranean lagoon before the start of the epizootic in spring 2011. We found that disease mortality of oysters showed strong spatial dependence clearly reflecting the epizootic process of local transmission. Disease initiated inside oyster farms spread rapidly beyond these areas. Local differences in energetic condition of oysters, partly driven by variation in food quality, played a significant role in the spatial and temporal dynamics of disease mortality. In particular, the relative contribution of diatoms to the diet of oysters was positively correlated with their energetic reserves, which in turn decreased the risk of disease mortality.
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Affiliation(s)
- Fabrice Pernet
- Ifremer, Laboratoire Environnement Ressource du Languedoc Roussillon, Bd Jean Monnet, Sète, France
- UMR LEMAR Ifremer/CNRS/UBO/IRD, Technopole de Brest-Iroise, Plouzané, France
- * E-mail:
| | - Franck Lagarde
- Ifremer, Laboratoire Environnement Ressource du Languedoc Roussillon, Bd Jean Monnet, Sète, France
| | | | - Gaetan Daigle
- Université Laval, Département de mathématiques et de statistique, Pavillon Alexandre-Vachon, Québec, Québec, Canada
| | - Jean Barret
- Ifremer, Laboratoire Environnement Ressource du Languedoc Roussillon, Bd Jean Monnet, Sète, France
| | - Patrik Le Gall
- Ifremer, Laboratoire Environnement Ressource du Languedoc Roussillon, Bd Jean Monnet, Sète, France
| | - Claudie Quere
- UMR LEMAR Ifremer/CNRS/UBO/IRD, Technopole de Brest-Iroise, Plouzané, France
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Wilberg MJ, Wiedenmann JR, Robinson JM. Sustainable exploitation and management of autogenic ecosystem engineers: application to oysters in Chesapeake Bay. Ecol Appl 2013; 23:766-776. [PMID: 23865228 DOI: 10.1890/12-0563.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Autogenic ecosystem engineers are critically important parts of many marine and estuarine systems because of their substantial effect on ecosystem services. Oysters are of particular importance because of their capacity to modify coastal and estuarine habitats and the highly degraded status of their habitats worldwide. However, models to predict dynamics of ecosystem engineers have not previously included the effects of exploitation. We developed a linked population and habitat model for autogenic ecosystem engineers undergoing exploitation. We parameterized the model to represent eastern oyster (Crassostrea virginica) in upper Chesapeake Bay by selecting sets of parameter values that matched observed rates of change in abundance and habitat. We used the model to evaluate the effects of a range of management and restoration options including sustainability of historical fishing pressure, effectiveness of a newly enacted sanctuary program, and relative performance of two restoration approaches. In general, autogenic ecosystem engineers are expected to be substantially less resilient to fishing than an equivalent species that does not rely on itself for habitat. Historical fishing mortality rates in upper Chesapeake Bay for oysters were above the levels that would lead to extirpation. Reductions in fishing or closure of the fishery were projected to lead to long-term increases in abundance and habitat. For fisheries to become sustainable outside of sanctuaries, a substantial larval subsidy would be required from oysters within sanctuaries. Restoration efforts using high-relief reefs were predicted to allow recovery within a shorter period of time than low-relief reefs. Models such as ours, that allow for feedbacks between population and habitat dynamics, can be effective tools for guiding management and restoration of autogenic ecosystem engineers.
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Affiliation(s)
- Michael J Wilberg
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, P.O. Box 38, Solomons, Maryland 20688, USA.
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Froelich B, Oliver JD. The interactions of Vibrio vulnificus and the oyster Crassostrea virginica. Microb Ecol 2013; 65:807-816. [PMID: 23280497 DOI: 10.1007/s00248-012-0162-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 12/11/2012] [Indexed: 06/01/2023]
Abstract
The human bacterial pathogen, Vibrio vulnificus, is found in brackish waters and is concentrated by filter-feeding molluscan shellfish, especially oysters, which inhabit those waters. Ingestion of raw or undercooked oysters containing virulent strains of V. vulnificus can result in rapid septicemia and death in 50 % of victims. This review summarizes the current knowledge of the environmental interactions between these two organisms, including the effects of salinity and temperature on colonization, uptake, and depuration rates of various phenotypes and genotypes of the bacterium, and host-microbe immunological interactions.
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Affiliation(s)
- Brett Froelich
- The University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell Street, Morehead City, NC 28557, USA.
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40
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Dineshram R, Wong KKW, Xiao S, Yu Z, Qian PY, Thiyagarajan V. Analysis of Pacific oyster larval proteome and its response to high-CO2. Mar Pollut Bull 2012; 64:2160-7. [PMID: 22921897 DOI: 10.1016/j.marpolbul.2012.07.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 06/17/2012] [Accepted: 07/25/2012] [Indexed: 05/20/2023]
Abstract
Most calcifying organisms show depressed metabolic, growth and calcification rates as symptoms to high-CO(2) due to ocean acidification (OA) process. Analysis of the global expression pattern of proteins (proteome analysis) represents a powerful tool to examine these physiological symptoms at molecular level, but its applications are inadequate. To address this knowledge gap, 2-DE coupled with mass spectrophotometer was used to compare the global protein expression pattern of oyster larvae exposed to ambient and to high-CO(2). Exposure to OA resulted in marked reduction of global protein expression with a decrease or loss of 71 proteins (18% of the expressed proteins in control), indicating a wide-spread depression of metabolic genes expression in larvae reared under OA. This is, to our knowledge, the first proteome analysis that provides insights into the link between physiological suppression and protein down-regulation under OA in oyster larvae.
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Affiliation(s)
- R Dineshram
- The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Hong Kong
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Andrew-Priestley MN, O'Connor WA, Dunstan RH, Van Zwieten L, Tyler T, Kumar A, MacFarlane GR. Estrogen mediated effects in the Sydney rock oyster, Saccostrea glomerata, following field exposures to sewage effluent containing estrogenic compounds and activity. Aquat Toxicol 2012; 120-121:99-108. [PMID: 22673404 DOI: 10.1016/j.aquatox.2012.03.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 03/26/2012] [Accepted: 03/27/2012] [Indexed: 06/01/2023]
Abstract
The Sydney rock oyster, Saccostrea glomerata, has been demonstrated as a useful biomonitor of estrogenic compounds following laboratory exposures, yet its utility in the assessment of estrogenic exposure and effects under field conditions requires investigation. To achieve this aim, S. glomerata were deployed in Newcastle, Australia in the effluent receiving marine waters of Burwood Beach WWTP (Burwood Beach "near", <50 m from outfall and Burwood Beach "far", 100-150 m from outfall) and reference locations (Redhead, Fingal Island 1 and Fingal Island 2) at depths of 4, 8 and 12 m for six weeks. Effluent receiving waters of Burwood Beach WWTP were found to be a suitable impact location, demonstrated via measurement of estrogenic compounds and activity throughout the deployment. Estrogenic compounds were detected (average of combined solids and liquid fractions) at average concentrations of: 1.42 ng/L for estrone, 0.69 ng/L for 17β estradiol, 3.83 ng/L for estriol (E3), 0.56 ng/L for 17α-ethynylestradiol, 64.2 ng/L for bisphenol A, 7.51 ng/L for 4-nonylphenol and 5.93 ng/L for 4-tert-octylphenol. Total estrogenic activity was estimated at 4.48 ng/L EEQ via the Yeast Estrogen Screen (YES(®)) assay (average of combined solid and liquid fractions). Female vitellogenin gene expression was highest at Burwood Beach locations, yet no significant differences were detected among locations for either sex. Vitellogenin protein was significantly higher (p<0.05) in S. glomerata at Burwood Beach Near compared to reference locations for the 4 and 12 m depths. Increased proportions of females were found at Burwood Beach Near, at 4m depth (p<0.05). Both Burwood Beach locations had higher proportions of mature female gonadal development stages compared to reference locations (p<0.05). Oocyte area was highest at both Burwood Beach locations, but no significant differences were detected among locations. Findings provided further evidence that female S. glomerata may be a suitable candidate species for assessment of effects of estrogenic compounds in Australian waters.
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Hughes AR, Rooker K, Murdock M, Kimbro DL. Predator cue and prey density interactively influence indirect effects on basal resources in intertidal oyster reefs. PLoS One 2012; 7:e44839. [PMID: 22970316 PMCID: PMC3436757 DOI: 10.1371/journal.pone.0044839] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Accepted: 08/13/2012] [Indexed: 12/01/2022] Open
Abstract
Predators can influence prey abundance and traits by direct consumption, as well as by non-consumptive effects of visual, olfactory, or tactile cues. The strength of these non-consumptive effects (NCEs) can be influenced by a variety of factors, including predator foraging mode, temporal variation in predator cues, and the density of competing prey. Testing the relative importance of these factors for determining NCEs is critical to our understanding of predator-prey interactions in a variety of settings. We addressed this knowledge gap by conducting two mesocosm experiments in a tri-trophic intertidal oyster reef food web. More specifically, we tested how a predatory fish (hardhead catfish, Ariopsis felis) directly influenced their prey (mud crabs, Panopeus spp.) and indirectly affected basal resources (juvenile oysters, Crassostrea virginica), as well as whether these direct and indirect effects changed across a density gradient of competing prey. Per capita crab foraging rates were inversely influenced by crab density, but they were not affected by water-borne predator cues. As a result, direct consumptive effects on prey foraging rates were stronger than non-consumptive effects. In contrast, predator cue and crab density interactively influenced indirect predator effects on oyster mortality in two experiments, with trait-mediated and density-mediated effects of similar magnitude operating to enhance oyster abundance. Consistent differences between a variable predator cue environment and other predator cue treatments (no cue and constant cue) suggests that an understanding of the natural risk environment experienced by prey is critical to testing and interpreting trait-mediated indirect interactions. Further, the prey response to the risk environment may be highly dependent on prey density, particularly in prey populations with strong intra-specific interactions.
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Affiliation(s)
- A Randall Hughes
- Coastal and Marine Laboratory, Florida State University, St Teresa, Florida, United States of America.
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Evans TG, Hofmann GE. Defining the limits of physiological plasticity: how gene expression can assess and predict the consequences of ocean change. Philos Trans R Soc Lond B Biol Sci 2012; 367:1733-45. [PMID: 22566679 PMCID: PMC3350660 DOI: 10.1098/rstb.2012.0019] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Anthropogenic stressors, such as climate change, are driving fundamental shifts in the abiotic characteristics of marine ecosystems. As the environmental aspects of our world's oceans deviate from evolved norms, of major concern is whether extant marine species possess the capacity to cope with such rapid change. In what many scientists consider the post-genomic era, tools that exploit the availability of DNA sequence information are being increasingly recognized as relevant to questions surrounding ocean change and marine conservation. In this review, we highlight the application of high-throughput gene-expression profiling, primarily transcriptomics, to the field of marine conservation physiology. Through the use of case studies, we illustrate how gene expression can be used to standardize metrics of sub-lethal stress, track organism condition in natural environments and bypass phylogenetic barriers that hinder the application of other physiological techniques to conservation. When coupled with fine-scale monitoring of environmental variables, gene-expression profiling provides a powerful approach to conservation capable of informing diverse issues related to ocean change, from coral bleaching to the spread of invasive species. Integrating novel approaches capable of improving existing conservation strategies, including gene-expression profiling, will be critical to ensuring the ecological and economic health of the global ocean.
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Affiliation(s)
- Tyler G Evans
- Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106-9620, USA.
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Abstract
Co-occurring foundation species can determine biological community structure via facilitation cascades. We examined the density dependencies of facilitation cascades, including how the density of a basal foundation species influences the density of secondary foundation species, and how the density of secondary foundation species influences community structure. The system in which we assessed density dependencies was a temperate mangrove forest in which pneumatophores trap the fucoid alga Hormosira banksii and provide substrate for the oyster, Saccostrea glomerata. The alga and oyster in turn determine benthic community structure. In the field, algal biomass was positively correlated with pneumatophore density. Oysters, by contrast, were highly over-dispersed and correlated with the presence/absence of pneumatophores. Epifaunal abundance and species richness were positively correlated with algal and oyster abundance, but their effects were independent. The positive effect of pneumatophore density on epifauna was primarily an indirect effect of trapping more algae. Pneumatophores did not directly influence invertebrate communities. Experiments revealed that, at very low pneumatophore densities, algal retention was insufficient to facilitate epifauna above that found on pneumatophores alone. At higher densities, however, increasing the density of pneumatophores increased algal retention, and the density and diversity of associated invertebrates. Shading by the mangrove canopy reduced algal biomass but did not modify the density-dependent nature of the cascade. Our results extend facilitation theory by showing that the density of both basal and secondary foundation species can be critical in triggering facilitation cascades. Our study also reveals that, where foundation species co-occur, multiple, independent cascades may arise from a single basal facilitator. These findings enhance our understanding of the role of density-dependent facilitation cascades in community assembly.
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Affiliation(s)
- Melanie J Bishop
- Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109, Australia.
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Burge CA, Friedman CS. Quantifying Ostreid herpesvirus (OsHV-1) genome copies and expression during transmission. Microb Ecol 2012; 63:596-604. [PMID: 21935610 DOI: 10.1007/s00248-011-9937-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Accepted: 08/26/2011] [Indexed: 05/03/2023]
Abstract
Understanding the pathogenic potential of a new pathogen strain or a known pathogen in a new locale is crucial for management of disease in both wild and farmed animals. The Ostreid herpesvirus-1 (OsHV-1), a known pathogen of early-life-stage Pacific oysters, Crassostrea gigas, has been associated with mortalities of juvenile oysters in many locations around the world including Tomales Bay, California. In two trials, the California OsHV-1 strain was transmitted from infected juvenile C. gigas to naïve C. gigas larvae. Survival of control larvae was high throughout both trials (97-100%) and low among those exposed to OsHV-1. No OsHV-1-exposed larvae survived to day 9 in trial 1, while trial 2 was terminated at day 7 when survival was 36.90 ± 8.66%. To assess the amount of OsHV-1 DNA present, we employed quantitative polymerase chain reaction (qPCR) assays based on the A fragment and OsHV-1 catalytic subunit of a DNA polymerase δ (DNA pol) gene. Viral genome copy numbers based on qPCR assays peaked between 3 and 5 days. To measure the presence of viable and actively transcribing virus, the DNA pol gene qPCR assay was optimized for RNA analysis after being reverse transcribed (RT-qPCR). A decline in virus gene expression was measured using RT-qPCR: relative to earlier experimental time points copy numbers were significantly lower on day 9, trial 1 (p < 0.05) and day 7, trial 2 (p < 0.05). Peaks in copies of active virus per genome occurred during two periods in trial 1 (days 1 and 5/7, p < 0.05) and one period in trial 2 (day 1, p < 0.05). Transmission electron microscopy confirmed OsHV-1 infection; herpesvirus-like nucleocapsids, capsids, and extracellular particles were visualized. We demonstrated the ability to transmit OsHV-1 from infected juvenile oysters to naïve larvae, which indicates the spread of OsHV-1 between infected hosts in the field and between commercial farms is possible. We also developed an important tool (OsHV-1-specific RT-qPCR for an active virus gene) for use in monitoring for active virus in the field and in laboratory based transmission experiments.
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Affiliation(s)
- Colleen A Burge
- School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA.
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Akcha F, Spagnol C, Rouxel J. Genotoxicity of diuron and glyphosate in oyster spermatozoa and embryos. Aquat Toxicol 2012; 106-107:104-13. [PMID: 22115909 DOI: 10.1016/j.aquatox.2011.10.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 10/21/2011] [Accepted: 10/25/2011] [Indexed: 05/31/2023]
Abstract
We investigated the effects of genotoxicant exposure in gametes and embryos to find a possible link between genotoxicity and reproduction/developmental impairment, and explore the impact of chemical genotoxicity on population dynamics. Our study focused on the genotoxic effects of two herbicides on oyster gametes and embryos: glyphosate (both as an active substance and in the Roundup formulation) and diuron. France is Europe's leading consumer of agrochemical substances and as such, contamination of France's coastal waters by pesticides is a major concern. Glyphosate and diuron are among the most frequently detected herbicides in oyster production areas; as oyster is a specie with external reproduction, its gametes and embryos are in direct contact with the surrounding waters and are hence particularly exposed to these potentially dangerous substances. In the course of this study, differences in genotoxic and embryotoxic responses were observed in the various experiments, possibly due to differences in pollutant sensitivity between the tested genitor lots. Glyphosate and Roundup had no effect on oyster development at the concentrations tested, whereas diuron significantly affected embryo-larval development from the lowest tested concentration of 0.05 μg L⁻¹, i.e. an environmentally realistic concentration. Diuron may therefore have a significant impact on oyster recruitment rates in the natural environment. Our spermiotoxicity study revealed none of the tested herbicides to be cytotoxic for oyster spermatozoa. However, the alkaline comet assay showed diuron to have a significant genotoxic effect on oyster spermatozoa at concentrations of 0.05 μg L⁻¹ upwards. Conversely, no effects due to diuron exposure were observed on sperm mitochondrial function or acrosomal membrane integrity. Although our initial results showed no negative effect on sperm function, the possible impact on fertilization rate and the consequences of the transmission of damaged DNA for oyster development and physiological performances, requires further investigation. A likely hypothesis to explain the embryotoxic and genotoxic effects of diuron is that it may act via causing oxidative stress.
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Affiliation(s)
- F Akcha
- Ifremer, Department of Biogeochemistry and Ecotoxicology, Laboratory of Ecotoxicology, Rue de l'Ile d'Yeu, BP 21105, 44311 Nantes Cedex 03, France.
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Humphries AT, La Peyre MK, Decossas GA. The effect of structural complexity, prey density, and "predator-free space" on prey survivorship at created oyster reef mesocosms. PLoS One 2011; 6:e28339. [PMID: 22145037 PMCID: PMC3228732 DOI: 10.1371/journal.pone.0028339] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 11/06/2011] [Indexed: 11/30/2022] Open
Abstract
Interactions between predators and their prey are influenced by the habitat they occupy. Using created oyster (Crassostrea virginica) reef mesocosms, we conducted a series of laboratory experiments that created structure and manipulated complexity as well as prey density and “predator-free space” to examine the relationship between structural complexity and prey survivorship. Specifically, volume and spatial arrangement of oysters as well as prey density were manipulated, and the survivorship of prey (grass shrimp, Palaemonetes pugio) in the presence of a predator (wild red drum, Sciaenops ocellatus) was quantified. We found that the presence of structure increased prey survivorship, and that increasing complexity of this structure further increased survivorship, but only to a point. This agrees with the theory that structural complexity may influence predator-prey dynamics, but that a threshold exists with diminishing returns. These results held true even when prey density was scaled to structural complexity, or the amount of “predator-free space” was manipulated within our created reef mesocosms. The presence of structure and its complexity (oyster shell volume) were more important in facilitating prey survivorship than perceived refugia or density-dependent prey effects. A more accurate indicator of refugia might require “predator-free space” measures that also account for the available area within the structure itself (i.e., volume) and not just on the surface of a structure. Creating experiments that better mimic natural conditions and test a wider range of “predator-free space” are suggested to better understand the role of structural complexity in oyster reefs and other complex habitats.
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Affiliation(s)
- Austin T Humphries
- School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, Louisiana, United States of America.
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Sow M, Durrieu G, Briollais L, Ciret P, Massabuau JC. Water quality assessment by means of HFNI valvometry and high-frequency data modeling. Environ Monit Assess 2011; 182:155-170. [PMID: 21229302 DOI: 10.1007/s10661-010-1866-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Accepted: 12/21/2010] [Indexed: 05/30/2023]
Abstract
The high-frequency measurements of valve activity in bivalves (e.g., valvometry) over a long period of time and in various environmental conditions allow a very accurate study of their behaviors as well as a global analysis of possible perturbations due to the environment. Valvometry uses the bivalve's ability to close its shell when exposed to a contaminant or other abnormal environmental conditions as an alarm to indicate possible perturbations in the environment. The modeling of such high-frequency serial valvometry data is statistically challenging, and here, a nonparametric approach based on kernel estimation is proposed. This method has the advantage of summarizing complex data into a simple density profile obtained from each animal at every 24-h period to ultimately make inference about time effect and external conditions on this profile. The statistical properties of the estimator are presented. Through an application to a sample of 16 oysters living in the Bay of Arcachon (France), we demonstrate that this method can be used to first estimate the normal biological rhythms of permanently immersed oysters and second to detect perturbations of these rhythms due to changes in their environment. We anticipate that this approach could have an important contribution to the survey of aquatic systems.
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Affiliation(s)
- Mohamedou Sow
- CNRS UMR 5805 EPOC, University of Bordeaux 1, Place du Dr Peyneau, 33120 Arcachon, France
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Abstract
Animal fertilization is governed by the interaction (binding) of proteins on the surfaces of sperm and egg. In many examples presented herein, fertilization proteins evolve rapidly and show the signature of positive selection (adaptive evolution). This review describes the molecular evolution of fertilization proteins in sea urchins, abalone, and oysters, animals with external fertilization that broadcast their gametes into seawater. Theories regarding the selective forces responsible for the rapid evolution driven by positive selection seen in many fertilization proteins are discussed. This strong selection acting on divergence of interacting fertilization proteins might lead to prezygotic reproductive isolation and be a significant factor in the speciation process. Since only a fraction of all eggs are fertilized and only an infinitesimal fraction of male gametes succeed in fertilizing an egg, gametes are obviously a category of entities subjected to intense selection. It is curious that this is never mentioned in the literature dealing with selection, perhaps because we know so little about fitness differences among gametes. (Ernst Mayr, 1997).
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Affiliation(s)
- Victor D Vacquier
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0202, USA.
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Choi UK, Lee OH, Kim YC. Effect of calcinated oyster shell powder on growth, yield, spawn run, and primordial formation of king oyster mushroom (Pleurotus eryngii). Molecules 2011; 16:2313-22. [PMID: 21394076 PMCID: PMC6259746 DOI: 10.3390/molecules16032313] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 02/26/2011] [Accepted: 03/09/2011] [Indexed: 11/16/2022] Open
Abstract
This study was conducted to evaluate the calcium (Ca) absorption efficacy of king oyster mushroom (Pleurotus eryngii) grown on sawdust medium supplemented with Ca-sources, including oyster shell powder, and to determine the efficacy of oyster shell powder as a calcium supplement on growth, yield, spawn run and primordial formation of P. eryngii. Optimum calcination of oyster shell powder was achieved at the temperature of 620.56 °C. A 1% supplementation of oyster shell powder in sawdust medium did not suppress the mycelial growth of P. eryngii. Also the supplementation of 2% calcinated oyster shell powder to sawdust medium potentially increased the calcium content up to a level of 315.7 ± 15.7 mg/100 g in the fruiting body of P. eryngii, without extension of duration of spawn run and the retardation of the days to primordial formation. These results suggest that the shellfish by-products, including oyster shell powder, can be utilized to develop calcium enriched king oyster mushrooms.
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Affiliation(s)
- Ung-Kyu Choi
- School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689, Korea; E-Mail: (U.-K.C.)
| | - Ok-Hwan Lee
- Department of Food Science and Biotechnology, Kangwon National University, Chuncheon 200, Korea
- Authors to whom correspondence should be addressed; E-Mails: (Y.-C.K.); (O.-H.L.); Tel.: +82-31-780-9145 (Y.-C.K.); +82-33-250-6454 (O.-H.L.); Fax: +82-31-780-9312 (Y.-C.K.); +82-33-241-0508 (O.-H.L.)
| | - Young-Chan Kim
- Institute of Korea Food Research, Seongnam, Kyonggi 463, Korea
- Authors to whom correspondence should be addressed; E-Mails: (Y.-C.K.); (O.-H.L.); Tel.: +82-31-780-9145 (Y.-C.K.); +82-33-250-6454 (O.-H.L.); Fax: +82-31-780-9312 (Y.-C.K.); +82-33-241-0508 (O.-H.L.)
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