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

Pasquaud, Stéphanie; Béguer, Mélanie; Larsen, Maja Hjort; Chaalali, Aurélie; Cabral, Henrique N.; Lobry, Jérémy

doi:10.1016/j.ecss.2012.03.021

Cited by 44 publications

(32 citation statements)

References 56 publications

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“…impact of the Blayais nuclear power plant, Service d'Observation en Milieu LITtoral [SOMLIT]). We focused on the middle zone of the Gironde estuary for 2 reasons: it contains the greatest diversity and variations in biological communities including autochthonous, allochthonous and migratory species (Pasquaud et al 2012, Chaalali et al 2013b, and the surveys carried out in this area provide the most abundant and diverse range of data (Chaalali et al 2013a). …”

Section: Time Series Datamentioning

confidence: 99%

“…We included the variables water temperature (T water ), salinity (S), and SPM; parameters that were assumed to have a direct impact on fish species composition and community structure (Selleslagh & Amara 2008, Pasquaud et al 2012. Samples were collected monthly from March to November (1 m below the water surface and 1 m above the bottom, at 3 h intervals during the tidal 1985 and 2014 were regularized using linear methods to fill in missing data, and de-seasonalised using the above described method (Table 1).…”

Section: Physico-chemical Datamentioning

confidence: 99%

“…The annual mean salinity has significantly increased in all sections of the estuary, though the trend is more perceptible in the downstream sections (Chaalali et al 2013c). Consequently, this marinisation has led to a progressive increase in the number of marine fish species in the estuarine area (Pasquaud et al 2012). Recently, Chaalali et al (2013a) analysed an environmental and biological dataset encompassing the period between 1979 and 2009, and suggested that the Gironde estuarine ecosystem has experienced 2 climate-related AESs over the last 3 decades.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have suggested that the Gironde estuary, like many other estuarine ecosystems (Goberville et al 2010), is going through a process of 'marinisation'. First termed by David et al (2007) and later used in several papers (Pasquaud et al 2012, Chaalali et al 2013a, it describes the process whereby marine waters flow far upstream into the Gironde basin, and thus into the continent, due to a drop in river discharge caused by the synergistic effect of reduced precipitation in the catchment area and increased water uptake for irrigated agriculture. The annual mean salinity has significantly increased in all sections of the estuary, though the trend is more perceptible in the downstream sections (Chaalali et al 2013c).…”

Section: Introductionmentioning

confidence: 99%

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Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem

Chevillot¹,

Pierre²,

Rigaud³

et al. 2016

Mar. Ecol. Prog. Ser.

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For decades, global climate change has directly and indirectly affected the structure and function of ecosystems. Abrupt changes in biodiversity have been observed in response to linear or sudden modifications to the environment. These abrupt shifts can cause long-term reorganizations within ecosystems, with communities exhibiting new functional responses to environmental factors. Over the last 3 decades, the Gironde estuary in southwest France has experienced 2 abrupt shifts in both the physical and chemical environments and the pelagic community. Rather than describing these shifts and their origins, we focused on the 3 inter-shift periods, describing the structure of the fish community and its relationship with the environment during these periods. We described fish biodiversity using a limited set of descriptors, taking into account both species composition and relative species abundances. Inter-shift ecosystem states were defined based on the relationship between this description and the hydro-physico-chemical variables and climatic indices defining the main features of the environment. This relationship was described using generalized linear mixed models on the entire time series and for each inter-shift period. Our results indicate that (1) the fish community structure has been significantly modified, (2) environmental drivers influencing fish diversity have changed during these 3 periods, and (3) the fish−environment relationships have been modified over time. From this, we conclude a regime shift has occurred in the Gironde estuary. We also highlight that anthropogenic influences have increased, which re-emphasizes the importance of local management in maintaining fish diversity and associated goods and services within the context of climate change.

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Section: Time Series Datamentioning

confidence: 99%

Section: Physico-chemical Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem

Chevillot¹,

Pierre²,

Rigaud³

et al. 2016

Mar. Ecol. Prog. Ser.

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“…In addition, local stochastic events such as weather extremes (e.g. droughts, floods, heat/cold waves) can induce fluctuations in the conditioning factors, influencing the biological processes and ecosystem development of estuaries (Kantoussan et al, 2012;Pasquaud et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of local and large-scale climate patterns on estuarine resident fishes: The example of Pomatoschistus microps and Pomatoschistus minutus

Nyitrai

Martinho

Dolbeth

et al. 2013

Estuarine, Coastal and Shelf Science

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a b s t r a c tLarge-scale and local climate patterns are known to influence several aspects of the life cycle of marine fish. In this paper, we used a 9-year database (2003e2011) to analyse the populations of two estuarine resident fishes, Pomatoschistus microps and Pomatoschistus minutus, in order to determine their relationships with varying environmental stressors operating over local and large scales. This study was performed in the Mondego estuary, Portugal. Firstly, the variations in abundance, growth, population structure and secondary production were evaluated. These species appeared in high densities in the beginning of the study period, with subsequent occasional high annual density peaks, while their secondary production was lower in dry years. The relationships between yearly fish abundance and the environmental variables were evaluated separately for both species using Spearman correlation analysis, considering the yearly abundance peaks for the whole population, juveniles and adults. Among the local climate patterns, precipitation, river runoff, salinity and temperature were used in the analyses, and North Atlantic Oscillation (NAO) index and sea surface temperature (SST) were tested as large-scale factors. For P. microps, precipitation and NAO were the significant factors explaining abundance of the whole population, the adults and the juveniles as well. Regarding P. minutus, for the whole population, juveniles and adults river runoff was the significant predictor. The results for both species suggest a differential influence of climate patterns on the various life cycle stages, confirming also the importance of estuarine resident fishes as indicators of changes in local and large-scale climate patterns, related to global climate change.

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Climate Change and Fishes in Estuaries

Gillanders¹,

McMillan²,

Patrick³

et al. 2022

Fish and Fisheries in Estuaries

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

Cited by 44 publications

References 56 publications

Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem

Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem

Effects of local and large-scale climate patterns on estuarine resident fishes: The example of Pomatoschistus microps and Pomatoschistus minutus

Climate Change and Fishes in Estuaries

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