Spawning Mediated Responses Of Pacific Oyster Crassostrea Gigas
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Spawning Mediated Responses Of Pacific Oyster Crassostrea Gigas To Environmental Stress
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Author : Yan Li
language : en
Publisher:
Release Date : 2008
Spawning Mediated Responses Of Pacific Oyster Crassostrea Gigas To Environmental Stress written by Yan Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Crassostrea categories.
Spawning Mediated Responses Of Pacific Oyster Crassostrea Gigas
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Author : Yan Li
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2009-11
Spawning Mediated Responses Of Pacific Oyster Crassostrea Gigas written by Yan Li and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-11 with categories.
Oyster mortality in summer is a global concern for the aquaculture industry. This issue can be getting worse and worse with global warming. Yan investigated the synergetic effect of spawning, food supply, pathogen and temperature on oyster morality in the laboratory and field. The results demonstrate that energy depletion during spawning compromises the metabolic and health status of oysters, leading to a possible mortality in summer for post-spawning oysters. This research contributes to our understanding of the mechanism of oyster mass mortality, and the results can be applied to the management and development of oyster aquaculture in Australia and overseas.
Ocean Acidification Influences On Physiology And Epigenetics In The Pacific Oyster Crassostrea Gigas
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Author : Yaamini Ranjani Venkataraman
language : en
Publisher:
Release Date : 2021
Ocean Acidification Influences On Physiology And Epigenetics In The Pacific Oyster Crassostrea Gigas written by Yaamini Ranjani Venkataraman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
As ocean acidification continues to impact marine ecosystems at unprecedented rates, phenotypicplasticity may allow organisms to withstand more stressful conditions. Genomic methods can elucidate molecular mechanisms that contribute to phenotypic plasticity, allowing for a deeper understanding of how physiological processes will be impacted by low pH. My dissertation examines the effects of ocean acidification on the Pacific oyster (Crassostrea gigas) stress response and reproduction; elucidate how exposure history impacts phenotype; and explore the role of functional role DNA methylation in somatic and reproductive tissue. I investigated the effect of regional environmental variation on the molecular physiology of C. gigas outplanted at five different estuarine sites (four in Puget Sound, one in Willapa Bay) in Washington, USA using gel-free proteomic methods. While there was no difference in survival, or any protein abundances due to pH differences between sites, C. gigas outplanted at the site with the highest temperature had significantly higher abundances of antioxidant enzymes and molecular chaperones, elucidating the molecular underpinnings of thermotolerance. In a hatchery setting, I explored the impact of ocean acidification on reproductive maturity and output. A seven week low pH exposure did not affect sex ratio or maturation stage; however, it did significantly affect survival of larvae. Even though adult oysters spent four months in ambient pH conditions between low pH exposure and strip spawning, larvae from females that experienced low pH conditions had significantly higher mortality. Finally, I conducted the first investigations examining the effect of ocean acidification in C. gigas methylomes. To investigate the role of environmentally-responsive methylation in reproductive tissue, I analyzed gonad methylomes of female C. gigas exposed to low pH. A total of 1,599 differentially methylated loci (DML) were found in gene bodies. The genic DML were associated with cilium movement, development, and cytoskeletal processes, implying a need to regulate cellular growth in the gonad in response to low pH. I then explored the influence of low pH on the somatic tissue methylome using diploid and triploid oyster ctenidia. Differences in ploidy status yielded 154 DML. These ploidy-DML were associated with cell-cell adhesion and dephosphorlylation processes, which are not commonly associated with methylome changes in organisms that undergo natural polyploidization. The 178 pH-DML were associated with processes commonly observed in oysters exposed to ocean acidification, including apoptosis, protein ubiquitination, zinc ion binding, and cytoskeletal processes. In both reproductive and somatic tissue, the enrichment of DML in genes with multiple transcripts could indicate a role for methylation to regulate gene expression via alternative splicing. Investigating the molecular underpinnings of responses to ocean acidification in C. gigas will provide a thorough understanding of this global aquaculture product’s ability to withstand future ocean conditions.
The Physiological And Molecular Response Of Aquatic Animals To Environmental Stresses
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Author : Lingling Wang
language : en
Publisher: Frontiers Media SA
Release Date : 2022-10-06
The Physiological And Molecular Response Of Aquatic Animals To Environmental Stresses written by Lingling Wang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-06 with Science categories.
The Behaviour Of The Pacific Oyster Crassostrea Gigas In Polluted And Unpolluted Environments
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Author : Wilfredo A. Almarzah G.
language : en
Publisher:
Release Date : 1992
The Behaviour Of The Pacific Oyster Crassostrea Gigas In Polluted And Unpolluted Environments written by Wilfredo A. Almarzah G. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Pacific oyster categories.
Biology Of Oysters
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Author : Brian Leicester Bayne
language : en
Publisher: Academic Press
Release Date : 2017-05-12
Biology Of Oysters written by Brian Leicester Bayne and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-12 with Science categories.
Biology of Oysters offers scientific insights into the structure and function of oysters. Written by an expert in the field of shellfish research, this book presents more than 50 years of empirical research literature. It provides an understanding of the edible oysters, in order to equip students and researchers with the background needed to undertake further investigations on this model marine invertebrate. Presents empirical research findings in context with the relevant theory and its expression in computer models Includes information on studies of other bivalve species such as mussels and clams Offers a description of the whole organism to provide a frame of reference for further research Includes research developments in the phylogeny, physiology and ecology of oysters
Molecular Physiology In Molluscs Of Economic Or Ecological Importance
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Author : Xiaotong Wang
language : en
Publisher: Frontiers Media SA
Release Date : 2019-10-24
Molecular Physiology In Molluscs Of Economic Or Ecological Importance written by Xiaotong Wang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-24 with categories.
As the largest marine phylum, molluscs comprise ~23% of all named marine organisms. Many molluscs have economic or ecological importance. With the development of molecular biology and omics techniques, significant gains have been made for molecular physiology in molluscs of economic or ecological importance.
Oceanic Abstracts
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Author :
language : en
Publisher:
Release Date : 1997-10
Oceanic Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-10 with Marine biology categories.
The Sexual Cycle Of The Pacific Oyster Crassostrea Gigas In Southern Ireland
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Author : Susan Steele
language : en
Publisher:
Release Date : 1998
The Sexual Cycle Of The Pacific Oyster Crassostrea Gigas In Southern Ireland written by Susan Steele and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Oysters categories.
A study was conducted from April 1996 to December 1997 on Crassostrea gigas grown in two sites on the south coast of Ireland. Gametogenesis was examined by histology, and related to parasite loading, condition index and environmental parameters of available food (Chlorophyll a) and water temperature. In site 1 (Dungarvan) oysters spawned in the summer of both years of the study. Oysters were infested with the parasitic copepod Mytilicola orientalis and the polychaete Polydora sp. In site 2 (Cork Harbour), oysters did not spawn in either year of the study. Oysters were infested with Polydora sp. and also showed shell blistering indicative of the influence of the pollutant tributyl tin. There were no significant differences in environmental parameters between the two sites leading to the conclusion that failure to spawn may have been pollution related. There was a possibility that difference in reproductive biology was possible genetic because due to disease transfer fears, oysters studied were from two different hatcheries. However, allozyme variation was examined and no significant difference was found between the two sites. Gametogenesis is related to the level of storage substrates in the body. In order to see the effects of spawning and resorbtion of gonad in oysters, protein glycogen and lipid levels were examined in selected tissue. When the oysters in site 2 did not spawn, they started a process of gamatic degeneration and resorbtion. This process has not proviously been fully described in Crassostrea gigas. The process of resorbtion of gametes was described and females, was examined ultrastructurally.
Biological Invasions In Changing Ecosystems
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Author : João Canning-Clode
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2015-01-01
Biological Invasions In Changing Ecosystems written by João Canning-Clode and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-01-01 with Science categories.
When organisms are deliberately or accidentally introduced into a new ecosystem a biological invasion may take place. These so-called ‘invasive species’ may establish, spread and ecologically alter the invaded community. Biological invasions by animals, plants, pathogens or vectors are one of the greatest environmental and economic threats and, along with habitat destruction, a leading cause of global biodiversity loss. In this book, more than 50 worldwide invasion scientists cover our current understanding of biological invasions, its impacts, patterns and mechanisms in both aquatic and terrestrial systems.