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Gallon Et Al 2017 JSR.Pdf Journal of Sea Research 130 (2017) 96–106 Contents lists available at ScienceDirect Journal of Sea Research journal homepage: www.elsevier.com/locate/seares Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database Régis K. Gallon a,b,⁎, Nicolas Lavesque d, Jacques Grall b,c,CélineLabrunee, Antoine Gremare d, Guy Bachelet d, Hugues Blanchet d, Paulo Bonifácio d,e, Vincent M.P. Bouchet f, Jean-Claude Dauvin g, Nicolas Desroy h, Franck Gentil i, Laurent Guerin j, Céline Houbin i, Jérôme Jourde k, Sandrine Laurand c,MichelLeDuffc, Vincent Le Garrec c, Xavier de Montaudouin d, Frédéric Olivier l, Francis Orvain m,Pierre-GuySauriauk, Éric Thiebaut i, Olivier Gauthier b,c a Conservatoire National des Arts et Métiers/INTECHMER – Laboratoire Universitaire des Sciences Appliquées de Cherbourg LUSAC, UNICAEN, 51000 Cherbourg, France b Laboratoire des Sciences de l'Environnement Marin (LEMAR UMR 6539 CNRS UBO IRD IFREMER), Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, 29280 Plouzané, France c Observatoire Marin (UMS 3113 CNRS), Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, 29280 Plouzané, France d Université de Bordeaux, CNRS, UMR 5805, EPOC, Station Marine d'Arcachon, 2 Rue du Professeur Jolyet, 33120 Arcachon, France e Sorbonne Universités, UPMC Univ Paris 6, UMR CNRS/UPMC 8222, LECOB, Observatoire Océanologique, 66650 Banyuls/Mer, France f Université de Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG, Laboratoire d'Océanologie et de Géosciences, F 62930 Wimereux, France g Normandie Univ., UNICAEN,UNIROUEN, Laboratoire Morphodynamique Continentale et Côtière, UMR 6143 M2C, 24 rue des Tilleuls, F14000 Caen, France h LER Bretagne Nord, IFREMER, 38 rue du Port Blanc, 35801 Dinard, France i Sorbonne Universités, UPMC Univ Paris 6, CNRS, Station Biologique de Roscoff, Adaptation et Diversité en Milieu Marin, UMR 7144, Place Georges Teissier, 29680 Roscoff, France j Service des Stations Marines, Muséum National d'Histoire Naturelle, Station Marine de Dinard - CRESCO, 38 rue du Port Blanc, 35801 Dinard, France k Université La Rochelle, UMR CNRS/7266, LIENSs, Bâtiment ILE, 2 rue Olympe de Gouges, 17000 La Rochelle, France l Muséum National d'Histoire Naturelle, Station Marine de Concarneau, UMR CNRS/MNHN/UPMC/UCBN/IRD 7208, BOREA, Esplanade de la Paix, 14032 Caen cedex, France m Normandie Univ., UNICAEN, UMR CNRS/MNHN/UPMC/UCBN/IRD 7208 BOREA, Esplanade de la Paix, 14032 Caen cedex, France article info abstract Article history: This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a Received 18 October 2016 collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated Received in revised form 10 March 2017 patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) sea- Accepted 20 March 2017 boards: English Channel, Bay of Biscay and Mediterranean Sea and 2) 0.5° latitudinal and longitudinal grid. Total ob- Available online 21 March 2017 served richness, rarefaction curves and three incidence-based richness estimators (Chao2, ICE and Jacknife1) were used to compare soft bottom habitats species richness in each seaboard. Overall, the Mediterranean Sea has the Keywords: Zoobenthos highest richness and despite higher sampling effort, the English Channel hosts the lowest number of species. The dis- Species richness tribution of species occurrence within and between seaboards was assessed for each major phylum using Regional pattern constrained rarefaction curves. The Mediterranean Sea hosts the highest number of exclusive species. In pairwise Latitudinal pattern comparisons, it also shares a lower proportion of taxa with the Bay of Biscay (34.1%) or the English Channel Soft-bottom (27.6%) than that shared between these two seaboards (49.7%). Latitudinal species richness patterns along the At- France lantic and English Channel coasts were investigated for each major phylum using partial LOESS regression control- ling for sampling effort. This showed the existence of a bell-shaped latitudinal pattern, highlighting Brittany as a hotspot for macrobenthic richness at the confluence of two biogeographic provinces. © 2017 Elsevier B.V. All rights reserved. 1. Introduction research (Renaud et al., 2009, Vandepitte et al., 2010). It is particularly rel- evant in the context of climate change as the distribution of some crusta- Accurately describing contemporary large-scale patterns of marine ceans (e.g. Pezy and Dauvin, 2016), bivalves (Philippart et al., 2003), macrobenthic diversity is one of the major objectives of marine ecological gastropods (Mieszkowska et al., 2007) and polycheates (Wethey and Woodin, 2008) are reported to move further North following tempera- ture increase. However benthic species response to increasing tempera- ⁎ Corresponding author at: Cnam/Intechmer, LUSAC UNICAEN, Boulevard Collignon, 50100 Cherbourg, France. ture seems to be complex (Hawkins et al., 2009) and slow (Hinz et al., E-mail address: [email protected] (R.K. Gallon). 2011). Indeed, differences in distribution change rates have been reported http://dx.doi.org/10.1016/j.seares.2017.03.011 1385-1101/© 2017 Elsevier B.V. All rights reserved. R.K. Gallon et al. / Journal of Sea Research 130 (2017) 96–106 97 among taxa as well as among life traits (see Pinsky et al., 2013; potentially host high species richness by combining the diversity of the Poloczanska et al., 2013), illustrating differential responses to climate adjoining biogeographic areas and sustaining species not found else- change among marine life compartments (e.g. highly motile vs slightly where (Kark and van Rensburg, 2006). Therefore, the present's objectives motile). Furthermore, global change also includes the introduction of are threefold (1) to compare species richness of soft-bottom communities alien species and anthropogenic pressures to coastal ecosystems, which between the three French seaboards, (2) to investigate species composi- are another major threats for marine biodiversity (Harley et al., 2006; tion and proportions of shared species among these regional species Occhipinti-Ambrogi, 2007)thatmodifies species composition at the re- pools and, (3) to examine latitudinal patterns along French Atlantic gional scale. coasts. This work was conducted using historical and recent data from a While it is still unclear exactly how global change will modify the re- macrobenthic fauna database compiled by the French Réseau des Stations gional distribution of species, it seems likely that these changes will et Observatoires Marins (RESOMAR). This national database was set up occur mostly along latitudinal gradients. In order to track and under- within the context of contemporary efforts leading to the constitution of stand these changes it is necessary to describe and analyze recent and similar large global and regional databases compiling marine biodiversity contemporary macrobenthic diversity patterns in this context. Only in datasets (e.g. OBIS, Macroben, LargeNet). doing so can we address the challenge of proposing plausible proximate and historical causes acting at different scales. Furthermore, the assess- 2. Materials and methods ment of the global distribution of species richness may help to under- stand differences across region in the context of invasive species 2.1. RESOMAR database propagation (Occhipinti-Ambrogi, 2007). French coastlines offer an in- teresting case study to address these questions as they cover a large lat- The RESOMAR Benthos Database (http://resomar-benthos.epoc.u- itudinal gradient including different biogeographical regions from the bordeaux1.fr/) compiles historical and current benthic macrofauna Northern European seas down to the Lusitanian province. datasets collected along the metropolitan France seaboards: English Species richness is the most elementary, easy to interpret and widely Channel, Bay of Biscay and Mediterranean Sea. It currently holds 106 used measure of biodiversity (e.g. Dornelas et al., 2014). It has been datasets for a total of 9990 sampling occasions (or station-date dyads) shown to follow a – generally unimodal – large-scale (N45°) latitudinal over a 50-year time period (1961–2011) (Fig. 1). In the RESOMAR Ben- gradient for marine benthic invertebrates with a peak in equatorial re- thos Database sampling tools are disparate, however N60% of sampling gions (Chaudhary et al., 2016). occasions were sampled by grabs (e.g. Day, Eckman, Hamon, Shipeck, Marine benthic species richness patterns have scarcely been studied Smith McIntyre). Thus we assumed that, at large-scale, the sampling simultaneously on the entirety of French seaboards (from 42°N to tools effect was outweighed by that for the sampling effort. The system- 51°N). Indeed, existing studies either had either limited geographic atic nomenclature of the database was checked following the World scope (e.g. eastern English Channel, Foveau et al., 2013; English Channel Register of Marine Species (WoRMS, http://www.marinespecies.org/). and Bay of Biscay estuaries, Blanchet et al., 2014; Gulf of Lion, Labrune et An Expert Committee composed of French experts in taxonomy from al., 2008), or focused only on single taxonomic groups (e.g. polychaetes, the EC, BB and MS was formed to solve possible misidentification issues. Dauvin et al., 2006; amphipods, Dauvin and Bellan-Santini,
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