Dietary changes of Mediterranean ShagsPhalacrocorax aristotelis desmarestiibetween the breeding and post-breeding seasons in the upper Adriatic Sea

Autor:	Barbara Cimador, Mauro Cosolo, Nicoletta Privileggi, Stefano Sponza
Rok vydání:	2011
Předmět:	Mediterranean climate Biomass (ecology) education Atherina boyeri Gobius niger Biology biology.organism_classification Demersal zone Predation Fishery Regurgitated food Seasonal breeder Ecology Evolution Behavior and Systematics Nature and Landscape Conservation
Zdroj:	Bird Study. 58:461-472
ISSN:	1944-6705 0006-3657
DOI:	10.1080/00063657.2011.603290
Popis:	Capsule Shags move between breeding and non-breeding areas and this is associated with a significant change in diet. Aims To determine whether the diet of Shags nesting on islets off the Croatian coast is the same as their diet after the post-breeding move to the Gulf of Trieste. Methods Diet was determined by the analysis of 611 regurgitated food pellets. Results A total of 23 988 prey items were identified in the sample of pellets. Post-breeding Shags in the Gulf of Trieste focused on demersal and relatively immobile Gobiidae (81.5% by number, 87.1% by biomass). The most frequent prey species was Gobius niger (70.8% by number). In the breeding season at Oruda island, Croatia, the diet was more varied. Breeding Shags fed on bentho-pelagic, mobile prey such as Atherina boyeri (28.4% in frequency), Serranus hepatus (16.1%) and Crenilabrus tinca (12.0%), while Gobiidae had a dietary frequency of only 18.1%. With respect to biomass the most important prey were Crenilabrus tinca (19.0%) and Serranus hepatus (...
Databáze:	OpenAIRE
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