Does the hydrodynamic, morphometric and sedimentary environment explain the structure of soft-bottom benthic assemblages in the Eastern Bay of Seine (English Channel)?

Dauvin, Jean–Claude; Lucas, Sabrina; Navon, Maxime; Lesourd, Sandric; Méar, Yann; Poizot, Emmanuel; Alizier, Sandrine

doi:10.1016/j.ecss.2017.03.014

Cited by 20 publications

(13 citation statements)

References 57 publications

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“…Assessing variability in biodiversity along environmental gradients and identifying factors responsible for spatial patterns in macrofaunal assemblages are a central theme in marine benthic ecology [10,11]. Since Petersen's study [12], studies conducted worldwide consider sediment characteristics as a major explanatory factor of benthic macrofauna distribution [13][14][15][16][17][18]. Moreover, at broader spatial scales, other natural environmental factors such as the hydrodynamic conditions (including freshwater outflow and wave action) seems to directly or indirectly control the presence and abundance of macrobenthos [19,20].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution

Foulquier

Baills²,

Arraud³

et al. 2020

Journal of Marine Sciences

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This study assesses the impacts of wave action and freshwater outflow on soft-bottom benthic macrofauna spatial distribution and temporal stability along the highly exposed French Basque coast. Sediment characteristics and macrofauna abundance have been seasonally investigated during two years for nine stations located at the same (6 m) depth and spread over three subtidal sites showing distinct exposure levels. Wave climate has been determined through an operational numerical model. A total of 121 taxa were recorded, gathered in three main faunal assemblages, as revealed by classification and ordination methods. Non-parametric multivariate multiple regression (distance-based linear model) showed that the variations in macrofaunal distribution can be explained by hydrodynamic conditions. Wave exposure strongly linked to estuarine inputs were the most relevant abiotic factors influencing distributional patterns and functional structure as described by biological traits analysis. Despite the influence of these abiotic variables affecting sedimentary dynamics, seasonal stability was observed in macrobenthic assemblages composition suggesting an ability to recover from natural disturbances such as (e.g.) winter storms. In this way, these results provide baseline knowledge for future ecosystem and resource management in shallow subtidal areas strongly exposed to swell and freshwater outflow where soft-bottom macrozoobenthic communities are less frequently studied.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution

Foulquier

Baills²,

Arraud³

et al. 2020

Journal of Marine Sciences

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“…2). Estimates of FP in the Seine nursery were In addition to its stable spatial pattern across the years studied, the macrobenthic community remained remarkably dominated by the same few taxa for 25 years, especially annelids (Dauvin et al 2017). In particular, O. fusiformis was the most abundant species from 1986from -1988from and in 1991from (Thiébaut et al 1997.…”

Section: Food Production: a Temporally Variable But Spatially Stable mentioning

confidence: 88%

“…1). This macrotidal area (the "Seine nursery"), has a tidal range of ~7 m near Le Havre harbor and a mean river flow of ~470 m 3 .s -1 at the entrance of the estuary, with high intra-and inter-annual variations in river discharge (Dauvin et al 2017;Romero et al 2018). The study site covers a subtidal shallow (mean depth = 8.2 m) area of 360 km², characterized by muddy-fine sand sediments and composed mostly of polyhaline waters in the outer estuary and euhaline waters in the bay (Thiébaut et al 1997;Savoye et al 2003).…”

Section: Study Areamentioning

confidence: 99%

“…Over the past three decades, the macroinvertebrate community in the eastern Bay of Seine and the outer Seine estuary has been studied extensively (Ménard et al 1989;Dauvin and Gillet 1991;Thiébaut et al 1997;Mouny et al 1998;Ghertsos et al 2001;Dauvin 2008;Dauvin et al 2017). The spatio-temporal patterns in macrobenthic production (as measured by FP) from 2008-2010 are strongly consistent with those previously reported, even though most studies focused on macrobenthic abundance or biomass.…”

Section: Food Production: a Temporally Variable But Spatially Stable mentioning

confidence: 99%

“…Surprisingly, few studies have attempted to relate spatio-temporal patterns of the macrobenthic community to those of higher trophic levels in the Seine nursery. For instance, the abundance of several macrobenthic species decreased greatly in the eastern Bay of Seine from 2008-2009 (Dauvin et al 2017), but its potential effect on the epibenthic predator community was not investigated. Several trophic models (Ecopath, EwE; Christensen et al 2005) have quantified energy flows between multiple functional groups in the eastern Bay of Seine and the outer Seine estuary, but none focused on the nursery function of this ecosystem.…”

Section: Relating Food Production To Food Consumption By Epibenthic Pmentioning

confidence: 99%

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Food limitation of juvenile marine fish in a coastal and estuarine nursery

Saulnier

Bris

Tableau

et al. 2020

Estuarine, Coastal and Shelf Science

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Despite their importance for species conservation and sound management of exploited living resources, the density-dependent mechanisms that regulate wild populations are among the least understood process in ecology. In many marine fish species, there is strong evidence that regulation occurs at the juvenile stage, when individuals concentrate in spatially restricted nurseries. However, little is known about the underlying mechanisms. Whether competition for food resources determines fish growth and survival is particularly controversial. We investigated whether food supply may have limited juvenile fish production (integrating both growth and survival) in a coastal and estuarine nursery in western Europe. Using a recent bioenergetics-based approach, we calculated annual macrobenthic food production (FP) and annual food consumption (FC) by juvenile fish and predatory invertebrates for three consecutive years (2008)(2009)(2010). We also calculated exploitation efficiency (FC:FP) and used it as an index of food limitation. Results revealed substantial interannual variations in FP (FP ∼2-3 times higher in 2008 and 2010 than in 2009). FC by young-of-the-year fish followed a fairly similar pattern. In addition, predatory invertebrates consumed as much food as juvenile fish, highlighting the need to consider all dominant epibenthic predators when estimating the overall predation pressure on macrobenthic prey. Lastly, exploitation efficiency of the entire epibenthic predator community reached ∼30% in 2009, which is relatively high despite the conservative modeling approach. Overall, these results suggest that food supply may have limited juvenile fish production during the study period, at least in 2009. Nonetheless, further studies based on longer time-series and/or other study sites are required to strengthen these findings.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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Structure of the benthic macrofauna of an anthropogenic influenced area: Skhira Bay (Gulf of Gabès, central Mediterranean Sea)

Boudaya

Mosbahi

Dauvin

et al. 2019

Environ Sci Pollut Res

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Does the hydrodynamic, morphometric and sedimentary environment explain the structure of soft-bottom benthic assemblages in the Eastern Bay of Seine (English Channel)?

Cited by 20 publications

References 57 publications

Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution

Hydrodynamic Conditions Effects on Soft-Bottom Subtidal Nearshore Benthic Community Structure and Distribution

Food limitation of juvenile marine fish in a coastal and estuarine nursery

Structure of the benthic macrofauna of an anthropogenic influenced area: Skhira Bay (Gulf of Gabès, central Mediterranean Sea)

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