A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems

Autor: Stephane Robert, Stephane Pouvreau, Marianne Alunno-Bruscia, Yves Bourles, Joseph Mazurie, Daniele Maurer, Aline Gangnery, Philippe Goulletquer
Rok vydání: 2011
Předmět:
Zdroj: Journal Of Sea Research (1385-1101) (Elsevier Science Bv), 2011-11, Vol. 66, N. 4, P. 340-348
ISSN: 1385-1101
Popis: Many studies based on bioenergetics growth models have investigated the effects of environmental factors on oyster (Crassostrea gigas) growth and physiology. However, most of these models are site-specific and cannot be app lied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a gen eric growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourles et al. 2009) for the stimulation of C. gigas growth in different cohorts (spats and adults) at major shellfish culture sites in France, in several years: Arcachon (1993-1994); Marennes-Oleron (2007); Quiberon (1999, 2000, 2001); Rade de B rest (2008); Baie du Mont-Saint-Michel (2003); Baie-des-Veys (2002). These different ecosystems offer a w ide range of values for the two forcing variables of the model: water temperature (range: 6-24 °C) and phytoplankton concentration (annual average: 110-700 x 10 3 cell.l -1 ). The validation data (dry flesh mass of C. gigas) were obtained from various growth surveys carried out by IFREMER. The oyster-DEB model simulated the oyster growth dynamics of both spat and adult stages of C. gigas accurately over time at the various culture sites. The model captures: i) the active spring growth; ii) the timing and amplitude of spawning events; and iii) the lean periods (i.e. loss of dry flesh mass) in autumn and winter. The half-saturation coefficient Xk is the only model parameter that varied between sites and years. This environment-specific coefficient reflects variability in the food of the oysters: quantitative and qualitative effects of the inorganic material and of the phytoplankton species on the feeding response of C. gigas. With a single set of parameters (other than for Xk), this is thus the first bio-energetic growth model for C. gigas robust enough and of a sufficiently generic nature for the accurate simulation of oyster growth in different Atlantic ecosystems. Highlights ► A generic growth model of the oyster Crassostrea gigas that is suitable for a generic application, i.e. with a constant set of parameters, in contrasting Atlantic environments and for different cohorts (spats and adults) was developed. ► The resulting oyster-DEB model simulated the oyster growth dynamics of both spat and adult stages of C. gigas accurately over time at the various culture sites. The model captures: i) the active spring growth; ii) the timing and amplitude of spawning events; and iii) the loss of dry flesh mass in autumn and winter. ► The half-saturation coefficient Xk is the only model parameter that varied between sites and years. This environment-specific coefficient reflects variability in the food of the oysters.
Databáze: OpenAIRE
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