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Effect of phytoplankton and temperature on the reproduction of the Pacific oyster Crassostrea gigas: Investigation through DEB theory
Bernard, I.; de Kermoysan, G.; Pouvreau, S. (2011). Effect of phytoplankton and temperature on the reproduction of the Pacific oyster Crassostrea gigas: Investigation through DEB theory. J. Sea Res. 66(4): 349-360. hdl.handle.net/10.1016/j.seares.2011.07.009
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101, more
Peer reviewed article  

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Keywords
    Gametogenesis; Crassostrea gigas (Thunberg, 1793) [WoRMS]; Marine
Author keywords
    DEB model; Reproductive effort; Spawning date; Functional response

Authors  Top | Dataset 
  • Bernard, I.
  • de Kermoysan, G.
  • Pouvreau, S.

Abstract
    DEB theory can be used to obtain a detailed description of energy allocation in organisms and the control of this allocation by temperature and food concentration. In this study, we modified the model of Bourlès et al. (2009) developed for the Pacific oyster, Crassostrea gigas, to improve the description of reproductive effort. The model was amended in two ways: a new set of parameters was incorporated and a full description of gonad construction in spring was added, with a new state variable. The application of this model to a dataset for oyster growth measured in four bays over two years showed that this model better described reproductive effort, without modifying overall growth dynamics. We then explored the reproductive responses of oysters to their environment in greater detail, by applying this new version of the model with the theoretical forcing variables of phytoplankton concentration and temperature. Spawning time was found to be driving principally by yearly mean temperature, and reproductive effort was found to depend mostly on the half-saturation coefficient of the functional response. These results highlight the importance of the half-saturation coefficient and provide additional support for field research on the food preferences of oysters.

Dataset
  • REPHY: Network Monitoring phytoplankton, more

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