Dernière mise à jour le : 26 janvier 2017

Influence of Green Tides in Coastal Nursery Grounds on the Habitat Selection and Individual Performance of Juvenile Fish


Coastal ecosystems, which provide numerous essential ecological functions for fish, are threatened by the proliferation of green macroalgae that significantly modify habitat conditions in intertidal areas. Understanding the influence of green tides on the nursery function of these ecosystems is essential to determine their potential effects on fish recruitment success. In this study, the influence of green tides on juvenile fish was examined in an intertidal sandy beach area, the Bay of Saint-Brieuc (Northwestern France), during two annual cycles of green tides with varying levels of intensity. The responses of three nursery-dependent fish species, the pelagic Sprattus sprattus (L.), the demersal Dicentrarchus labrax (L.) and the benthic Pleuronectes platessa L., were analysed to determine the effects of green tides according to species-specific habitat niche and behaviour. The responses to this perturbation were investigated based on habitat selection and a comparison of individual performance between a control and an impacted site. Several indices on different integrative scales were examined to evaluate these responses (antioxidant defence capacity, muscle total lipid, morphometric condition and growth). Based on these analyses, green tides affect juvenile fish differently according to macroalgal density and species-specific tolerance, which is linked to their capacity to move and to their distribution in the water column. A decreasing gradient of sensitivity was observed from benthic to demersal and pelagic fish species. At low densities of green macroalgae, the three species stayed at the impacted site and the growth of plaice was reduced. At medium macroalgal densities, plaice disappeared from the impacted site and the growth of sea bass and the muscle total lipid content of sprat were reduced. Finally, when high macroalgal densities were reached, none of the studied species were captured at the impacted site. Hence, sites affected by green tides are less favourable nursery grounds for all the studied species, with species-specific effects related to macroalgal density.


keyboard_arrow_right Titre : Influence of Green Tides in Coastal Nursery Grounds on the Habitat Selection and Individual Performance of Juvenile Fish
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Réveillac Elodie, Lebot Clément, Randon Marine, Murillo Laurence, Pape Olivier Le, Luherne Emilie Le
keyboard_arrow_right Auteur(s) organisme(s) : Écologie et santé des écosystèmes (ESE) ; Institut National de la Recherche Agronomique (INRA) - Agrocampus Ouest
keyboard_arrow_right Date de publication : 26 janvier 2017
keyboard_arrow_right Editeur(s) : Public Library of Science
keyboard_arrow_right Tags thématiques : algue, zone côtière, zone intertidale, littoral, marée verte
keyboard_arrow_right Mots-clés libres : algue verte/Antioxidants/écosystème du littoral/Fish physiology/Habitats/Lipids/macroalgue/macroalgues/Marine fish/Morphometry/Otolith/Tides
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1371/journal.pone.0170110
keyboard_arrow_right Collection : PLOS ONE
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