دورية أكاديمية
Feeding behavior and trophic interaction of three shark species in the Galapagos Marine Reserve
| العنوان: | Feeding behavior and trophic interaction of three shark species in the Galapagos Marine Reserve |
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| المؤلفون: | Páez-Rosas, Diego, Insuasti-Zarate, Paul, Riofrío-Lazo, Marjorie, Galván-Magaña, Felipe |
| المساهمون: | Universidad San Francisco de Quito (USFQ) in Ecuador, Centro Interdisciplinario de Ciencias Marinas (CICIMAR) in Mexico |
| المصدر: | PeerJ ; volume 6, page e4818 ; ISSN 2167-8359 |
| بيانات النشر: | PeerJ |
| سنة النشر: | 2018 |
| المجموعة: | PeerJ (E-Journal - via CrossRef) |
| الوصف: | There is great concern about the future of sharks in Ecuador because of the lack of biological knowledge of most species that inhabit the region. This paper analyzes the feeding behavior of the pelagic thresher shark ( Alopias pelagicus ), the blue shark ( Prionace glauca ) and the silky shark ( Carcharhinus falciformis ) through the use of stable isotopes of carbon and nitrogen ( δ 13 C and δ 15 N), with the aim of determining the degree of interaction between these species in the Galapagos Marine Reserve. No interspecific differences were found in use of oceanic vs. inshore feeding areas ( δ 13 C: Kruskal–Wallis test, p = 0.09). The position in the hierarchy of the food web where A. pelagicus feeds differed from that of the other species ( δ 15 N: Kruskal–Wallis test, p = 0.01). There were no significant differences in δ 13 C and δ 15 N values between males and females of the three species (Student’s t -test, p > 0.05), which suggests that both sexes have a similar feeding behavior. A specialist strategy was observed in P. glauca (trophic niche breadth TNB = 0.69), while the other species were found to be generalist ( A. pelagicus TNB = 1.50 and C. falciformis TNB = 1.09). The estimated trophic level (TL) varied between the three species. C. falciformis occupied the highest trophic level (TL = 4.4), making it a quaternary predator in the region. The results of this study coincide with the identified behavior in these predators in other areas of the tropical Pacific (Colombia and Mexico), and suggest a pelagic foraging strategy with differential consumption of prey between the three species. These ecological aspects can provide timely information when implementing in conservation measures for these shark species in the Tropical Pacific and Galapagos Marine Reserve. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.7717/peerj.4818 |
| الإتاحة: | https://doi.org/10.7717/peerj.4818Test https://peerj.com/articles/4818.pdfTest https://peerj.com/articles/4818.xmlTest https://peerj.com/articles/4818.htmlTest |
| حقوق: | http://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: | edsbas.D0FA1D74 |
| قاعدة البيانات: | BASE |
| DOI: | 10.7717/peerj.4818 |
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