What can the shell tell about the scallop? Using growth trajectories along latitudinal and bathymetric gradients to reconstruct physiological history with DEB theory

• Published in: Journal of Sea Research
• Main Authors: Lavaud, Romain, Jolivet, Aurelie, Rannou, Eric, Jean, Fred, Strand, Oivind, Flye-Sainte-Marie, Jonathan
• Other Authors: Fisheries and Oceans Canada (DFO), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mathématiques de Bretagne Atlantique (LMBA), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institute of Marine Research Bergen (IMR), University of Bergen (UiB)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: feeding-activity; Environmental reconstruction; Dynamic Energy Budget; Bathymetric gradient; energy budget model; Modeling; Sclerochronology; crassostrea-gigas; pecten-maximus; food; ACL; Pecten maximus; coastal waters; sea; Growth; bivalve; phytoplankton; great scallop; Latitudinal gradient; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Crassostrea gigas
• Online Access: https://hal.archives-ouvertes.fr/hal-02871386; https://doi.org/10.1016/j.seares.2018.04.001

WOS:000453497600019 The great scallop, Pecten maximus, presents a strong variability of growth and reproductive patterns along its spatial distribution range. Such differences in life history traits result from complex interactions between organisms and environmental conditions that can be apprehended through the study of energy dynamics. As the determination of accurate food proxy can be a limitation for modeling bioenergetic, recent work by Lavaud et al. (accepted, this issue), based on the DEB theory, provided a new approach consisting of using temperature and growth time series to reconstruct the required assimilated energy to support observed growth. In this study we present an application of this method to growth trajectories of the great scallop P. maximus used to elucidate: (1) life history traits patterns and (2) the choice of food availability proxies. The inverted DEB model was used to reconstruct the functional response (f) for different age classes of P. maximus in 10 locations of its spatial distribution range. We especially explored the patterns of reconstructed f along latitudinal and bathymetric gradients. Average reconstructed f as well as its maximum value were found to increase with latitude. The variability off, although increasing, did not show a significant relationship with the geographical position. Along the bathymetric gradient strong positive relationships were found between the mean f or its variability and depth. Ontogeny had low effect on the reconstructed f. Furthermore, as the inverted DEB model allows the reconstruction of physiological variables and energy fluxes, we explored the potential differences in reserve and maintenance fluxes dynamics from great scallops living in these contrasting environments. For one of the study sites, comparisons of f with field measurements of 11 food indicators (chlorophyll-a from the pelagic/benthic domains, phytoplankton cell counts, etc.) highlighted the complexity of the functional response and the diet of P. maximus. Pelagic or benthic ...