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Title

Increase of marine juvenile fish abundances in the middle Gironde estuary related to warmer and more saline waters, due to global changes

Publication Year

2012

Author(s)
  • Pasquaud, Stephanie
  • Beguer, Melanie
  • Larsen, Maja Hjort
  • Chaalali, Aurelie
  • Cabral, Henrique
  • Lobry, Jeremy
Source
ESTUARINE COASTAL AND SHELF SCIENCE Volume: 104 Pages: 46-53 Published: 2012
ISSN
0272-7714
Abstract

Estuaries have an essential ecological function for several marine fish species, that use these systems as nurseries. Previous studies in the Gironde estuary have reported an increase in water temperature and an extended seawater intrusion associated to global changes. In this study, we evaluated whether these changes impact the nursery function in the middle part of the system, based on the analyses of long-term data series (1991-2009) collected in that area. Trend analysis, correlations and generalized additive models (GAM) were computed in order to study the influence of water temperature and salinity changes on marine juveniles occurrence/densities. Results showed that densities of all the studied species (i.e. Engraulis encrasicolus, Sprattus sprattus, Dicentrarchus labrax, Solea solea, Argyrosomus regius, Merlangius merlangus) significantly increased over the period considered. Changes in water temperature and seawater intrusion contributed to explain the variability in presence/absence and in densities of the majority of these species. However, the deviance explained by GAM and the relevance of these two explanatory variables differed considerably according to species. For most species, it was suggested that the interaction of these two factors, and their effects on other variables, may explain the increase in abundance in the middle part of the Gironde. The effects of global changes in this estuarine system may favour its nursery function for marine juveniles, but some evidence of effects at a wider scale (community and ecosystem levels) may alter the structure and functioning of this system. (C) 2012 Elsevier Ltd. All rights reserved.

Author Keyword(s)
  • nursery function
  • marine fish
  • estuarine system
  • temperature increase
  • saline intrusion
  • long-term series
KeyWord(s) Plus
  • EASTERN CONTINENTAL-SHELF
  • NORTH-ATLANTIC OCEAN
  • SOLE SOLEA-SOLEA
  • CLIMATE-CHANGE
  • TAGUS ESTUARY
  • RECRUITMENT VARIABILITY
  • BRISTOL CHANNEL
  • SW FRANCE
  • COMMUNITY
  • COASTAL
ESI Discipline(s)
  • Geosciences
  • Plant & Animal Science
Web of Science Category(ies)
  • Marine & Freshwater Biology
  • Oceanography
Adress(es)

[Pasquaud, Stephanie; Cabral, Henrique] Univ Lisbon, Fac Ciencias, Ctr Oceanog, P-1749016 Lisbon, Portugal; [Pasquaud, Stephanie; Beguer, Melanie; Larsen, Maja Hjort; Lobry, Jeremy] Irstea, Unite Ecosyst Estuariens & Poissons Migrateurs Am, F-33612 Cestas, France; [Chaalali, Aurelie] Univ Bordeaux 1, Lab Oceanog Biol, UMR CNRS 5805, F-33405 Talence, France

Reprint Adress

Pasquaud, S (reprint author), Univ Lisbon, Fac Ciencias, Ctr Oceanog, P-1749016 Lisbon, Portugal.

Country(ies)
  • France
  • Portugal
CNRS - Adress(es)
  • Environnements et paléoenvironnements océaniques et continentaux (EPOC), UMR5805
Accession Number
WOS:000305381200004
uid:/7FH8QZHK
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