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Integrating the effects of salinity on the physiology of the eastern oyster, Crassostrea virginica, in the northern Gulf of Mexico through a Dynamic Energy Budget model

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  • Lavaud, Romain
  • La Peyre, Megan K.
  • Casas, Sandra M.
  • Bacher, Cédric
  • La Peyre, Jérôme F.

Abstract

We present a Dynamic Energy Budget (DEB) model for the eastern oyster, Crassostrea virginica, which enables the inclusion of salinity as a third environmental variable, on top of the standard foodr and temperature variables. Salinity changes have various effects on the physiology of oysters, potentially altering filtration and respiration rates, and ultimately impacting growth, reproduction and mortality. We tested different hypotheses as to how to include these effects in a DEB model for C. virginica. Specifically, we tested two potential mechanisms to explain changes in oyster shell growth (cm), tissue dry weight (g) and gonad dry weight (g) when salinity moves away from the ideal range: 1) a negative effect on filtration rate and 2) an additional somatic maintenance cost. Comparative simulations of shell growth, dry tissue biomass and dry gonad weight in two monitored sites in coastal Louisiana experiencing salinity from 0 to 28 were statistically analyzed to determine the best hypothesis. Model parameters were estimated through the covariation method, using literature data and a set of specifically designed ecophysiological experiments. The model was validated through independent field studies in estuaries along the northern Gulf of Mexico. Our results suggest that salinity impacts C. virginica’s energy budget predominantly through effects on filtration rate. With an overwhelming number of environmental factors impacting organisms, and increasing exposure to novel and extreme conditions, the mechanistic nature of the DEB model with its ability to incorporate more than the standard food and temperature variables provides a powerful tool to verify hypotheses and predict individual organism performance across a range of conditions.

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  • Lavaud, Romain & La Peyre, Megan K. & Casas, Sandra M. & Bacher, Cédric & La Peyre, Jérôme F., 2017. "Integrating the effects of salinity on the physiology of the eastern oyster, Crassostrea virginica, in the northern Gulf of Mexico through a Dynamic Energy Budget model," Ecological Modelling, Elsevier, vol. 363(C), pages 221-233.
  • Handle: RePEc:eee:ecomod:v:363:y:2017:i:c:p:221-233
    DOI: 10.1016/j.ecolmodel.2017.09.003
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    References listed on IDEAS

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    1. Piñeiro, Gervasio & Perelman, Susana & Guerschman, Juan P. & Paruelo, José M., 2008. "How to evaluate models: Observed vs. predicted or predicted vs. observed?," Ecological Modelling, Elsevier, vol. 216(3), pages 316-322.
    2. Wang, Hongqing & Huang, Wenrui & Harwell, Mark A. & Edmiston, Lee & Johnson, Elijah & Hsieh, Ping & Milla, Katherine & Christensen, John & Stewart, Jessica & Liu, Xiaohai, 2008. "Modeling oyster growth rate by coupling oyster population and hydrodynamic models for Apalachicola Bay, Florida, USA," Ecological Modelling, Elsevier, vol. 211(1), pages 77-89.
    3. Saraiva, S. & van der Meer, J. & Kooijman, S.A.L.M. & Sousa, T., 2011. "Modelling feeding processes in bivalves: A mechanistic approach," Ecological Modelling, Elsevier, vol. 222(3), pages 514-523.
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    1. Yurek, Simeon & Eaton, Mitchell J. & Lavaud, Romain & Laney, R. Wilson & DeAngelis, Donald L. & Pine, William E. & La Peyre, Megan & Martin, Julien & Frederick, Peter & Wang, Hongqing & Lowe, Michael , 2021. "Modeling structural mechanics of oyster reef self-organization including environmental constraints and community interactions," Ecological Modelling, Elsevier, vol. 440(C).
    2. Venolia, Celeste T. & Lavaud, Romain & Green-Gavrielidis, Lindsay A. & Thornber, Carol & Humphries, Austin T., 2020. "Modeling the Growth of Sugar Kelp (Saccharina latissima) in Aquaculture Systems using Dynamic Energy Budget Theory," Ecological Modelling, Elsevier, vol. 430(C).
    3. Lavaud, Romain & Ullman, David S. & Venolia, Celeste & Thornber, Carol & Green-Gavrielidis, Lindsay & Humphries, Austin, 2023. "Production potential of seaweed and shellfish integrated aquaculture in Narragansett Bay (Rhode Island, U.S.) using an ecosystem model," Ecological Modelling, Elsevier, vol. 481(C).
    4. Lavaud, Romain & La Peyre, Megan K & Couvillion, Brady & Beseres Pollack, Jennifer & Brown, Vincent & Palmer, Terence A & Keim, Barry, 2024. "Predicting restoration and aquaculture potential of eastern oysters through an eco-physiological mechanistic model," Ecological Modelling, Elsevier, vol. 489(C).

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