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Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea

Understanding the ecological and anthropogenic drivers of population dynamics requires detailed studies on habitat selection and spatial distribution. Although small pelagic fish aggregate in large shoals and usually exhibit important spatial structure, their dynamics in time and space remain unpred...

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Autores principales: Saraux, Claire, Fromentin, Jean-Marc, Bigot, Jean-Louis, Bourdeix, Jean-Hervé, Morfin, Marie, Roos, David, Van Beveren, Elisabeth, Bez, Nicolas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4222880/
https://www.ncbi.nlm.nih.gov/pubmed/25375656
http://dx.doi.org/10.1371/journal.pone.0111211
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author Saraux, Claire
Fromentin, Jean-Marc
Bigot, Jean-Louis
Bourdeix, Jean-Hervé
Morfin, Marie
Roos, David
Van Beveren, Elisabeth
Bez, Nicolas
author_facet Saraux, Claire
Fromentin, Jean-Marc
Bigot, Jean-Louis
Bourdeix, Jean-Hervé
Morfin, Marie
Roos, David
Van Beveren, Elisabeth
Bez, Nicolas
author_sort Saraux, Claire
collection PubMed
description Understanding the ecological and anthropogenic drivers of population dynamics requires detailed studies on habitat selection and spatial distribution. Although small pelagic fish aggregate in large shoals and usually exhibit important spatial structure, their dynamics in time and space remain unpredictable and challenging. In the Gulf of Lions (north-western Mediterranean), sardine and anchovy biomasses have declined over the past 5 years causing an important fishery crisis while sprat abundance rose. Applying geostatistical tools on scientific acoustic surveys conducted in the Gulf of Lions, we investigated anchovy, sardine and sprat spatial distributions and structures over 10 years. Our results show that sardines and sprats were more coastal than anchovies. The spatial structure of the three species was fairly stable over time according to variogram outputs, while year-to-year variations in kriged maps highlighted substantial changes in their location. Support for the McCall's basin hypothesis (covariation of both population density and presence area with biomass) was found only in sprats, the most variable of the three species. An innovative method to investigate species collocation at different scales revealed that globally the three species strongly overlap. Although species often co-occurred in terms of presence/absence, their biomass density differed at local scale, suggesting potential interspecific avoidance or different sensitivity to local environmental characteristics. Persistent favourable areas were finally detected, but their environmental characteristics remain to be determined.
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spelling pubmed-42228802014-11-13 Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea Saraux, Claire Fromentin, Jean-Marc Bigot, Jean-Louis Bourdeix, Jean-Hervé Morfin, Marie Roos, David Van Beveren, Elisabeth Bez, Nicolas PLoS One Research Article Understanding the ecological and anthropogenic drivers of population dynamics requires detailed studies on habitat selection and spatial distribution. Although small pelagic fish aggregate in large shoals and usually exhibit important spatial structure, their dynamics in time and space remain unpredictable and challenging. In the Gulf of Lions (north-western Mediterranean), sardine and anchovy biomasses have declined over the past 5 years causing an important fishery crisis while sprat abundance rose. Applying geostatistical tools on scientific acoustic surveys conducted in the Gulf of Lions, we investigated anchovy, sardine and sprat spatial distributions and structures over 10 years. Our results show that sardines and sprats were more coastal than anchovies. The spatial structure of the three species was fairly stable over time according to variogram outputs, while year-to-year variations in kriged maps highlighted substantial changes in their location. Support for the McCall's basin hypothesis (covariation of both population density and presence area with biomass) was found only in sprats, the most variable of the three species. An innovative method to investigate species collocation at different scales revealed that globally the three species strongly overlap. Although species often co-occurred in terms of presence/absence, their biomass density differed at local scale, suggesting potential interspecific avoidance or different sensitivity to local environmental characteristics. Persistent favourable areas were finally detected, but their environmental characteristics remain to be determined. Public Library of Science 2014-11-06 /pmc/articles/PMC4222880/ /pubmed/25375656 http://dx.doi.org/10.1371/journal.pone.0111211 Text en © 2014 Saraux et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Saraux, Claire
Fromentin, Jean-Marc
Bigot, Jean-Louis
Bourdeix, Jean-Hervé
Morfin, Marie
Roos, David
Van Beveren, Elisabeth
Bez, Nicolas
Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title_full Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title_fullStr Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title_full_unstemmed Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title_short Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea
title_sort spatial structure and distribution of small pelagic fish in the northwestern mediterranean sea
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4222880/
https://www.ncbi.nlm.nih.gov/pubmed/25375656
http://dx.doi.org/10.1371/journal.pone.0111211
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