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Intraspecific variation in feeding strategies of Galapagos sea lions: A case of trophic specialization

PloS one, 2017-10, Vol.12 (10), p.e0185165-e0185165 [Tạp chí có phản biện]

COPYRIGHT 2017 Public Library of Science ;COPYRIGHT 2017 Public Library of Science ;This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1932-6203 ;EISSN: 1932-6203 ;DOI: 10.1371/journal.pone.0185165 ;PMID: 29059188

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Nhan đề:
Intraspecific variation in feeding strategies of Galapagos sea lions: A case of trophic specialization
Tác giả: Páez-Rosas, Diego ; Villegas-Amtmann, Stella ; Costa, Daniel
Chiaradia, André
Chủ đề: Analysis ; Animal behavior ; Animal feeding and feeds ; Animals ; Behavior ; Biological evolution ; Biology and Life Sciences ; Comparative analysis ; Competition ; Diving ; Diving behavior ; Earth Sciences ; Ecological monitoring ; Ecology ; Ecology and Environmental Sciences ; Ecosystems ; Ecuador ; Feeding ; Feeding Behavior ; Flexibility ; Food and nutrition ; Forages ; Foraging behavior ; Galápagos sea lion ; Global positioning systems ; GPS ; Marine mammals ; National parks ; Otariidae ; Phocarctos hookeri ; Predators ; Prey ; Principal Component Analysis ; Remote Sensing Technology ; Resource availability ; Satellite navigation systems ; Sea lions ; Sea Lions - physiology ; Specialization ; Species ; Species Specificity ; Studies ; Telemetry ; Trophic levels ; Zalophus californianus ; Zalophus wollebaeki
Là 1 phần của: PloS one, 2017-10, Vol.12 (10), p.e0185165-e0185165
Mô tả: The trophic behavior of marine predators varies according to the level of competition to which they are exposed. In general, populations that inhabit lower productivity systems face a strong intraspecific competition, which contributes to the development of different foraging strategies to maximize nutritional efficiency. Given the high trophic flexibility of Zalophus wollebaeki, this species is considered appropriate for the analysis of such behavior. Furthermore, this trophic flexibility has allowed them to persist in a seemingly marginal ecosystem. In this study, we used a comparative analysis of variables (diet and dive behavior) related to Z. wollebaeki trophic niche plasticity to better understand their foraging ecology, using techniques such scat analysis, satellite telemetry and complementarily an isotopic analysis. Scat analysis revealed intra-population variation in their diet, represented by prey from different environments (epipelagic and benthic). These results are supported by the animals' locations at sea and diving profiles. Global Positioning System (GPS) and time-depth recorder (TDR) records showed the existence of two groups, with differing feeding areas and diving behavior. Also the δ15N values showed differences in the trophic level at which the species fed. These results constitute a relevant finding in the evolutionary behavior of the species, showing that Z. wollebaeki has developed a high degree of foraging flexibility, thus increasing its survival rate in an ecosystem that is highly demanding in terms of resource availability.
Nơi xuất bản: United States: Public Library of Science
Ngôn ngữ: English
Số nhận dạng: ISSN: 1932-6203
EISSN: 1932-6203
DOI: 10.1371/journal.pone.0185165
PMID: 29059188
Nguồn: PLoS (Open access)
Geneva Foundation Free Medical Journals at publisher websites
MEDLINE
PubMed Central
ProQuest Central
DOAJ Directory of Open Access Journals

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Intraspecific variation in feeding strategies of Galapagos sea lions: A case of trophic specialization

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