[MARMAM] Please post: New publication- Resource partitioning between common bottlenose dolphin (Tursiops truncatus) and the Israeli bottom trawl fishery? Assessment by stomach contents and tissue stable isotopes analysis

Aviad Scheinin shani.aviad at gmail.com
Sun Sep 21 08:11:13 PDT 2014


Dear Colleagues,

We are pleased to announce the publication of the following article:

 Resource partitioning between common bottlenose dolphin (Tursiops
truncatus) and the Israeli bottom trawl fishery?   Assessment by stomach
contents and tissue stable isotopes analysis
A.P. Scheinin, D. Kerem, S. Lojen, J. Liberzon and E. Spanier

 *Journal of the Marine Biological Association of the United Kingdom,
volume 94, issue 06, pp. 1203-1220.*

*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 (d15N and d13C) 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 d15N value of CBD muscle
was found to be relatively low compared to other geographical areas and the
estimated mean d15N 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.



The article can be accessed via: http://journals.cambridge.org/repo_A93iEsQ6

or by requesting an electronic reprint from shani.aviad at gmail.com

-- 

__________________________________________________________________
Aviad Scheinin, Ph.D
shani.aviad at gmail.com

The Mediterranean Marine Biodiversity Program coordinator - Hamaarag
(Israel's national nature assessment program) http://www.hamaarag.org.il/


Chairman, IMMRAC - Israel Marine Mammal Research & Assistance center
http://immrac.org/

Home address: Hairusim 33, Nes-Ziona 7408937, Israel

Tel 972-8-9406584 Mobile 052-3571193


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