Stomach content analysis: Comparison amongst different sources of sampling in the study of the diet of sea lions in Argentina

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY
Ana Harrington , Gustavo A. Daneri , Esperanza A. Varela , Adriana Farias , Mariana Descalzo , Alejandra V. Volpedo
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引用次数: 0

Abstract

The South American sea lion, Otaria flavescens, has proven to be an excellent biological sampler of the marine biodiversity since it is possible, through the examination of its diet, to determinate the distribution and abundance of marine resources in the northern Patagonian ecosystem. There are different methods to analyze the diet of pinnipeds, such as the use of scats, stomach contents, fatty acids and stable isotopes. The aim of the present study was to compare the type of information obtained from stomach contents analysis according to different sources of sampling (1- stomach contents from animals found dead on the coast, 2- natural regurgitations and 3- stomach lavage of previously anesthetized individuals). Between 2005 and 2022 a total of 48 stomach contents of O. flavescens were obtained at the sea lions rookeries of Punta Bermeja (41°09′S, 63°05′ W), Promontorio Belén (41° 09′S; 63° 48′W) and Caleta de los Loros (41°02′ S 64°10′ W) (San Matías gulf, Argentina). These three sources of sampling provided different dietary information. Stomach contents from dead animals presented more diverse prey than those coming from the two other sources. Overall, the fish species Raneya brasiliensis was the main prey item found, followed by cephalopods and crustaceans, coinciding with previous dietary reports based on scat analysis. The results obtained suggest that scat analysis is still the most appropriate method for monitoring the diet of sea lions on a temporal and spatial basis, being stomach content analysis a good complementary source of information.

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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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