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Impact of environmental variability on Pinctada margaritifera life-history traits: A full life cycle deb modeling approach

Author

Listed:
  • Sangare, Nathanaël
  • Lo-Yat, Alain
  • Moullac, Gilles Le
  • Pecquerie, Laure
  • Thomas, Yoann
  • Lefebvre, Sébastien
  • Gendre, Romain Le
  • Beliaeff, Benoît
  • Andréfouët, Serge

Abstract

The black-lipped pearl oyster (Pinctada margaritifera) is extensively farmed in French Polynesia to produce black pearls. For a sustainable management of marine resources, studying interactions between organisms and environment, and the associated factors and processes that will impact their life cycle and thus modulate population dynamics is a major research priority. Here, we describe black-lipped pearl oyster energy acquisition and use, and its control by temperature and food concentration within the Dynamic Energy Budget (DEB) theory framework. The model parametrization was based on literature data and a specific laboratory experiment. Model validation was carried out thanks to historical in-situ datasets and a dedicated field survey. Three theoretical environmental scenarios were built to investigate the response of the pearl oyster to environmental variations. We successfully modeled a wide range of life-stage-specific traits and processes, especially the delayed acceleration of growth after settlement. Applying the model on field data collected at three different culture sites required only one free-fitted parameter, the half saturation coefficient Xk, which controls how ingestion depends on food density. Xk integrates all variations linked to the trophic environment. Analysis of the kinetics of energy fluxes under theoretical environmental scenarios suggests that temperature variations induce seasonality of reproduction in a species thought to spawn opportunistically throughout the whole year. The major influence of food concentration fluctuations on growth rate and reproductive effort is highlighted. The model showed the lower performances associated with recovery time between food-rich and starvation periods. The implications of these findings in the context of black pearl farming in a changing environment are discussed.

Suggested Citation

  • Sangare, Nathanaël & Lo-Yat, Alain & Moullac, Gilles Le & Pecquerie, Laure & Thomas, Yoann & Lefebvre, Sébastien & Gendre, Romain Le & Beliaeff, Benoît & Andréfouët, Serge, 2020. "Impact of environmental variability on Pinctada margaritifera life-history traits: A full life cycle deb modeling approach," Ecological Modelling, Elsevier, vol. 423(C).
  • Handle: RePEc:eee:ecomod:v:423:y:2020:i:c:s0304380020300788
    DOI: 10.1016/j.ecolmodel.2020.109006
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    1. Johann D. Bell & Alexandre Ganachaud & Peter C. Gehrke & Shane P. Griffiths & Alistair J. Hobday & Ove Hoegh-Guldberg & Johanna E. Johnson & Robert Le Borgne & Patrick Lehodey & Janice M. Lough & Rich, 2013. "Mixed responses of tropical Pacific fisheries and aquaculture to climate change," Nature Climate Change, Nature, vol. 3(6), pages 591-599, June.
    2. Péter K. Molnár & Andrew E. Derocher & Tin Klanjscek & Mark A. Lewis, 2011. "Predicting climate change impacts on polar bear litter size," Nature Communications, Nature, vol. 2(1), pages 1-8, September.
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    1. Hilsenroth, Jana & Grogan, Kelly A. & Frazer, Thomas K., 2021. "Assessing the effects of increasing surface seawater temperature on black pearl production in French Polynesia: A bioeconomic simulation," Ecological Economics, Elsevier, vol. 181(C).
    2. Raapoto, H. & Monaco, C.J. & Van Wynsberge, S. & Le Gendre, R. & Le Luyer, J., 2024. "Assessing regional connectivity patterns of bivalvia in fragmented archipelagos: Insights from biophysical modeling in French Polynesia," Ecological Modelling, Elsevier, vol. 489(C).
    3. Laure Vaitiare André & Simon Van Wynsberge & Mireille Chinain & Clémence Mahana Iti Gatti & Vetea Liao & Serge Andréfouët, 2022. "Spatial Solutions and Their Impacts When Reshuffling Coastal Management Priorities in Small Islands with Limited Diversification Opportunities," Sustainability, MDPI, vol. 14(7), pages 1-24, March.

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