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A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems
Alunno-Bruscia, M.; Bourles, Y.; Maurer, D.; Robert, S.; Mazurié, J.; Gangnery, A.; Goulletquer, P.; Pouvreau, S. (2011). A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems. J. Sea Res. 66(4): 340-348. https://dx.doi.org/10.1016/j.seares.2011.07.008
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, meer
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| Trefwoorden |
Aquatic communities > Plankton > Phytoplankton
Coastal environment
Modelling
Bivalvia [WoRMS]; Magallana gigas (Thunberg, 1793) [WoRMS]
Marien/Kust |
| Author keywords |
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| Auteurs | | Top |
- Alunno-Bruscia, M.
- Bourles, Y.
- Maurer, D.
- Robert, S.
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- Mazurié, J.
- Gangnery, A.
- Goulletquer, P.
- Pouvreau, S.
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| Abstract |
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 applied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a generic growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourlès 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-Oléron (2007); Quiberon (1999, 2000, 2001); Brest Harbour (2008); Mont-Saint-Michel Bay (2003); Baie-des-Veys (2002). These different ecosystems offer a wide range of values for the two forcing variables of the model: water temperature (range: 6-24 °C) and phytoplankton concentration (annual average: 110–700 × 103 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. |
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