Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database

Gallon, Régis; Lavesque, Nicolas; Grall, Jacques; Labrune, Céline; Grémare, Antoine; Bachelet, Guy; Blanchet, Hugues; Bonifácio, Paulo; Bouchet, Vincent M. P.; Dauvin, Jean–Claude; Desroy, Nicolas; Gentil, Franck; Guérin, Laurent; Houbin, Céline; Jourde, Jérôme; Laurand, Sandrine; Duff, Michel Le; Garrec, Vincent Le; Montaudouin, Xavier de; Olivier, Frédéric; Orvain, Francis; Sauriau, Pierre-Guy; Thiébaut, Éric; Gauthier, Olivier

doi:10.1016/j.seares.2017.03.011

Cited by 13 publications

(12 citation statements)

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“…The inner stations had the highest level of diversity for meroplankton. This likely reflects the influence of larval export from the bays, which hosts abundant and highly diverse benthic communities (Chauvaud et al, 2000;Gallon et al, 2017). In addition, groups that are known for their coastal affiliations (e.g.…”

Section: High Spatial Heterogeneity In the Mesozooplankton Community From The Nearshore To Offshorementioning

confidence: 99%

Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales

Brandão

Comtet

Pouline³

et al. 2021

ICES Journal of Marine Science

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The coastal oceans can be highly variable, especially near ocean fronts. The Ushant Front is the dominant oceanographic feature in the Iroise Sea (NE Atlantic) during summer, separating warm stratified offshore waters from cool vertically-mixed nearshore waters. Mesozooplankton community structure was investigated over an annual cycle to examine relationships with oceanographic conditions. DNA metabarcoding of COI and 18S genes was used in communities from six sites along two cross-shelf transects. Taxonomic assignments of 380 and 296 OTUs (COI and 18S, respectively) identified 21 classes across 13 phyla. Meroplankton relative abundances peaked in spring and summer, particularly for polychaete and decapod larvae, respectively, corresponding to the reproductive periods of these taxa. Meroplankton was most affected by season, while holoplankton varied most by shelf position. Copepods with a mixed feeding strategy were associated with the most offshore sites, especially in the presence of the front, while filter-feeding or carnivorous copepods were associated with nearshore sites. In sum, mesozooplankton communities in well-mixed coastal waters were distinct from those found in the Ushant Front (high thermal stratification and chlorophyll-a). Furthermore, the benthic compartment, through its partial life cycle in the water column, contributed to high heterogeneity in planktonic communities over short temporal and spatial scales.

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Section: High Spatial Heterogeneity In the Mesozooplankton Community From The Nearshore To Offshorementioning

confidence: 99%

Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales

Brandão

Comtet

Pouline³

et al. 2021

ICES Journal of Marine Science

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“…This study provides a comprehensive view of the extent and drivers of Zostera marina trait variation across Brittany. This region's 500‐km coast is a highly diverse environmental mosaic (Boyé et al., 2017; Gallon et al., 2017). Although its macrotidal shores (Whitfield & Elliott, 2012) span a limited thermal gradient, generally lying within a suitable range for Z. marina growth (Table ; Figure ; Lee et al., 2007; Nejrup & Pedersen, 2008; Wilson & Lotze, 2019), this region is representative of the diversity of Z. marina intertidal habitats in the North‐East Atlantic in terms of substrate, salinity and hydrodynamic conditions (Hily et al., 2003; Moore & Short, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…To fill this gap, we study the phenotypic responses of intertidal Z . marina across a region (a) that is a highly diverse environmental mosaic (Gallon et al., 2017), covering most of the intertidal habitats of Z. marina in the North‐East Atlantic (Hily et al., 2003), and (b) was shown to support high genetic and phenotypic diversity for Z. marina (Becheler et al., 2010). We use a regional monitoring of eight intertidal Z .…”

Section: Introductionmentioning

confidence: 99%

Drivers and limits of phenotypic responses in vulnerable seagrass populations:Zostera marinain the intertidal

et al. 2021

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Intertidal seagrass meadows are exposed to both marine and terrestrial environmental constraints. Seagrass vulnerability to climate changes in these highly dynamic and thermally stressful environments is concerning. Using broadscale monitoring data covering contrasted intertidal environments, this study aims to provide a comprehensive view of the extent, drivers and potential limits of Zostera marina phenotypic responses. The links between phenotypic and reproductive strategies are also explored. Across 500 km of coastline, Z. marina exhibited extensive variations of density, morphology, above‐ and below‐ground biomass and rates of clonality. Variance partitioning of phenotypic traits confirmed the strong link between intertidal seagrass populations and broadscale climate variability. However, it also highlighted a non‐negligible role of local factors such as exposure regime, substrate and tidal cycles. In its response to the environment, Z. marina displayed a trade‐off between the density and size of shoots, leading to two distinct phenotypic types: high densities and low above‐ to below‐ground biomass ratios (Type 1) in response to both high hydrodynamic and temperature stress, and low densities, high above‐ground biomass per shoot and developed leaves and sheaths (Type 2) in the most stable and less stressful intertidal environments. We argue that Type 1 maximizes self‐facilitation whereas Type 2 minimizes intraspecific competition, and that their occurrence matches predictions from the stress‐gradient hypothesis (SGH). Building on the SGH, we propose a generalized response of seagrass to environmental changes and discuss the role of light as a potential limiting resource for intertidal meadows. Synthesis. Here, we show how the SGH can explain seagrass phenotypic responses, drawing on previous experimental results to provide relevant predictions across different stress gradients. We also show that Zostera marina responds to strong hydrodynamics and thermal constraints, both likely to increase in the intertidal with climate changes, with a facilitation‐maximizing phenotypic type (Type 1). This strategy appears incompatible with the competition‐minimizing Type 2 found when seagrass face resource limitation, such as light limitation induced by water quality degradation. This potential limit to the resilience of intertidal seagrass populations in the face of cumulative stressors raises concern about their vulnerability regarding future climate scenarios.

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“…The Iroise Sea, west of Brittany, is reported as a biogeographical transition zone for a number of benthic, intertidal, and marine species (Gallon et al 2017). Multiple crustaceans (Ingle and Clark 2008;Dauvin 2009;Deli et al 2019), nudibranchs (Grall et al 2015), and key commercially important species, such as the Green Ormer, Haliotis tuberculata (Roussel and Van Wormhoudt 2017), have a northern limit on the coast of Brittany or the Channel Isles.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the successful arrival or recruitment of C. erythropus larvae to the UK appears to be rare, having been observed only twice in the last 60 years. Understanding the processes that facilitated or limited the species' arrival could inform us on the processes that allow range expansion across the English Channel, allowing predictions for other species' distributions in the future-particularly those with populations around the Iroise Sea, a noted biogeographic transition zone (Gallon et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The range expansion of Clibanarius erythropus to the UK suggests that other range-shifting intertidal species may not follow

2022

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The ranges of species are shifting as a consequence of anthropogenic climate change. In the marine realm biogeographic transition zones could form barriers to dispersal and inhibit range-shift, but little is known about this potential effect. The hermit crab Clibanarius erythropus appeared in the UK in 2016 with the nearest reproducing population being on the northern coast of Brittany. This raises questions of which conditions may have permitted C. erythropus to cross the English Channel (7.25°W, 49.00°N) and whether this barrier could be overcome by other intertidal species. Dispersal simulations suggest the larvae of C. erythropus arrived in 2014, originated from North Brittany, experienced a mean temperature of around 16 °C, and took longer than 20 days to be transported across the channel. The transportation of larvae from Brittany to the southwest UK appears to be rare and driven by occasional, unusual ocean currents. The English Channel may continue to prevent species with pelagic larvae that settle within 20 days, such as many species of gastropod, annelids, and macroalgae, from successfully range expanding to the UK. North Brittany was the only landmass from which it is feasible the UK population of C. erythropus could have originated. Therefore, species with long-lived pelagic larvae but without reproducing populations in North Brittany may not appear in the southwest UK until the species are established in North Brittany. The English Channel could continue to limit the ability of many intertidal species to shift their range with climate change.

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Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database

Cited by 13 publications

References 92 publications

Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales

Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales

Drivers and limits of phenotypic responses in vulnerable seagrass populations:Zostera marinain the intertidal

The range expansion of Clibanarius erythropus to the UK suggests that other range-shifting intertidal species may not follow

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