Spatial distribution of crustacean demersal assemblages in trawl grounds off Galician and Cantabrian shelf

Abstract

Event Abstract Back to Event Spatial distribution of crustacean demersal assemblages in trawl grounds off Galician and Cantabrian shelf Esther Abad1*, Julio Valeiras1, Eva Velasco2, Alberto Serrano3 and Antonio Punzon Merino3 1 Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, Spain 2 Instituto Español de Oceanografia, Centro Oceanográfico de Gijon, Spain 3 Instituto Español de Oceanografia, Centro Oceanográfico de Santander, Spain Studies on the spatial distribution patterns of decapods crustacens in the Galician and Cantabrian continental shelf are scarce. Decapods are the second group in abundance after fish in the area, and it is a target group in fisheries. In the framework of the Ecosystem approach fisheries management, it is necessary to increase knowledge on the ecological aspects of these species at a regional scale. The study area includes the Galician and Cantabrian continental shelf and slope. Data come from IEO surveys carried out on the oceanographic vessel “Cornide de Saavedra” from 2007 to 2014 in autumn. A total of 800 trawling hauls were sampled. Sampler used was an otter trawl “Baca” type (mesh size of 60 mm in the net and 20 mm in the cod end). The sampling unit was a 30-minute haul during daytime at a speed of 3 knots in a randomly stratified scheme by depth with 3 strata among 70 and 500 m (special hauls higher than 500 m have also been included). Crustacean abundance data were fourth-root transformed and subjected to cluster analysis using the Bray-Curtis similarity index to characterize crustacean assemblages in soft bottoms. SIMPER analysis was use to identify species typifying each group and a non-metric multidimensional scaling analysis was carried out. Ecological indices per cluster group were also obtained. As a result of a hierarchical classification analysis three assemblages were detected: I) Shelf assemblage with a medium depth of 135 m. II) Upper slope assemblage with a medium depth of 235 m. III) Middle slope assemblage with a medium depth of 525 m. Depth appears to be the most important factor in structuring assemblages, just like in the entire demersal and epibenthic communities in the study area. Keywords: distribution, Crustacea, Decapoda, Fisheries, Ecology Conference: XIX Iberian Symposium on Marine Biology Studies, Porto, Portugal, 5 Sep - 9 Sep, 2016. Presentation Type: Poster Presentation Topic: 4. FISHERIES, AQUACULTURE AND BIOTECHNOLOGY Citation: Abad E, Valeiras J, Velasco E, Serrano A and Punzon Merino A (2016). Spatial distribution of crustacean demersal assemblages in trawl grounds off Galician and Cantabrian shelf. Front. Mar. Sci. Conference Abstract: XIX Iberian Symposium on Marine Biology Studies. doi: 10.3389/conf.FMARS.2016.05.00126 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 15 May 2016; Published Online: 03 Sep 2016. * Correspondence: PhD. Esther Abad, Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, Vigo, 36390, Spain, esther.abad@vi.ieo.es Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Esther Abad Julio Valeiras Eva Velasco Alberto Serrano Antonio Punzon Merino Google Esther Abad Julio Valeiras Eva Velasco Alberto Serrano Antonio Punzon Merino Google Scholar Esther Abad Julio Valeiras Eva Velasco Alberto Serrano Antonio Punzon Merino PubMed Esther Abad Julio Valeiras Eva Velasco Alberto Serrano Antonio Punzon Merino Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.