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Resource partitioning between common bottlenose dolphin (Tursiops truncatus) and the Israeli bottom trawl fishery? Assessment by stomach contents and tissue stable isotopes analysis

Published online by Cambridge University Press:  11 August 2014

A.P. Scheinin*
Affiliation:
Department of Maritime Civilizations, The Leon Recanati Institute for Maritime Studies, The Leon H. Charney School for Marine Sciences, University of Haifa, Mount Carmel, Haifa 31905, Israel IMMRAC (Israel Marine Mammal Research & Assistance Center), University of Haifa, Mount Carmel, Haifa 31905, Israel
D. Kerem
Affiliation:
Department of Maritime Civilizations, The Leon Recanati Institute for Maritime Studies, The Leon H. Charney School for Marine Sciences, University of Haifa, Mount Carmel, Haifa 31905, Israel IMMRAC (Israel Marine Mammal Research & Assistance Center), University of Haifa, Mount Carmel, Haifa 31905, Israel
S. Lojen
Affiliation:
Department of Environmental Sciences, J. Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
J. Liberzon
Affiliation:
Faculty of Civil and Environmental Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
E. Spanier
Affiliation:
Department of Maritime Civilizations, The Leon Recanati Institute for Maritime Studies, The Leon H. Charney School for Marine Sciences, University of Haifa, Mount Carmel, Haifa 31905, Israel
*
Correspondence should be addressed to: A.P. Scheinin, University of Haifa, Mount Carmel, Haifa 31905, Israel email: shani.aviad@gmail.com

Abstract

Common bottlenose dolphin (CBD) and bottom trawlers exploit the same ecological niche. The estimated CBD population along the Israeli coastline consumes roughly 1280 t of prey annually, similar to the mean annual trawl-fishery yield of 1300 t. In the ultra-oligotrophic Levantine Basin, the potential for competition for limited resources therefore exists. We aimed to examine whether the two consumers indeed harvest the same trophic level of the food web and the same members of that level. These questions were addressed by stomach content and stable isotope (δ15N and δ13C) analyses. The database included 26 prey-containing stomachs collected between 1996 and 2008 and muscle tissue samples of 23 dolphins and of 27 species of commercial fish and invertebrates for stable isotopes analysis. The 59.3 kg combined stomach content included at least 754 prey items, 97.3% of which were fish, belonging to 22 identified species. About half (46.4%) of the prey mass had medium-to-high commercial value. The overall similarity of the composition of the pooled biomass and that of the average commercial catch was expressed by a Pianka index of 0.49. Sparidae (sea bream) was the only family important for both consumers. The mean δ15N value of CBD muscle was found to be relatively low compared to other geographical areas and the estimated mean δ15N of its diet fell below that of most commercial species tested. Our findings suggest that CBD and the fisheries only partly share resources, with CBD having an overall minor effect on the bottom trawl fishery, mainly on the Sparidae catch.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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Resource partitioning between common bottlenose dolphin (Tursiops truncatus) and the Israeli bottom trawl fishery? Assessment by stomach contents and tissue stable isotopes analysis
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