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Title: Biodiversity in the by-catch communities of the pelagic ecosystem in the Western Indian Ocean
Authors: Lezama-Ochoa, N.; Murua, H.; Chust, G.; Ruiz, J.; Chavance, P.; Delgado de Molina, A.; Caballero, A.; Sancristobal, I.
Citation: BIODIVERSITY AND CONSERVATION, 2015, 24, 2647-2671
Abstract: Diversity in the by-catch communities from the pelagic ecosystem in the tropical tuna purse seine fishery has been poorly studied. This study uses different biodiversity measures to compare drifting fish aggregating devices (FADs) and Free School sets (sets made on schools of tuna) of the Western Indian Ocean. Data was collected from observer programs carried out by the European Union between 2003 and 2010 on board Spanish and French fleets. Alpha (species diversity of a particular area) and Beta diversity (difference in species composition between different areas) was analyzed to assess differences in the number of species, abundances and the species composition between areas and fishing modes. Generalized additive models were undertaken to explore which geographical/environmental variables explain the distribution of species richness index and Shannon diversity index in both fishing modes. Results showed that by-catch species in FAD communities may be used as observatories of surface pelagic biodiversity in combination with Free School communities. FAD communities were more diverse with higher number of species (74 species) and evenly distributed than Free School communities (56 species). However, environmental variables played a more important role in Free School communities. Somalia area and Mozambique Channel were the areas with highest biodiversity rates in both fishing modes. This work contributed for the future implementation of the EAFM to manage the pelagic ecosystem in a holistic and more integrated way.
Keywords: By-catch; Diversity; Purse seine fishery; Western Indian Ocean; Ecosystem Approach to Fisheries Management; SPECIES RICHNESS ESTIMATORS; AGGREGATING DEVICES FADS; LONGLINE FISHERY; POINT HYPOTHESIS; ATLANTIC-OCEAN; DIVERSITY; IMPLEMENTATION; DISTRIBUTIONS; MANAGEMENT; ABUNDANCE
Issue Date: 2015
Publisher: SPRINGER
Type: Article
Language: English
DOI: 10.1007/s10531-015-0951-3
URI: http://dspace.azti.es/handle/24689/214
ISSN: 0960-3115
E-ISSN: 1572-9710
Funder: AZTI-Tecnalia, Institut de Recherche pour le Developpement (IRD)
Instituto Espanol de Oceanografia (IEO) through the EU \[1543/2000, 1639/2001, 1581/2004]
Inaki Goenaga (FCT grant)
Appears in Publication types:Artículos científicos



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