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title The cephalopod prey of the Weddell seal, Leptonychotes weddellii, a biological sampler of the Antarctic marine ecosystem
authors Negri, A; Daneri, GA; Ceia, F; Vieira, R; Cherel, Y; Coria, NR; Corbalan, A; Xavier, JC
author full name Negri, A.; Daneri, G. A.; Ceia, F.; Vieira, R.; Cherel, Y.; Coria, N. R.; Corbalan, A.; Xavier, J. C.
title The cephalopod prey of the Weddell seal, Leptonychotes weddellii, a biological sampler of the Antarctic marine ecosystem
nationality internacional
language English
document type Article
author keywords Antarctica; Leptonychotes weddellii; Diet; Cephalopods; Stable isotopes
abstract Weddell seals, Leptonychotes weddellii, are important apex predators in the food web of the Antarctic marine ecosystem. However, detailed information on their trophic relationships with cephalopods is scarce. Moreover, cephalopods play a key role in the marine environment, but knowledge of their feeding habits is limited by lack of data. Here, we have combined the use of this seal as a biological sampler together with measurements of the stable isotopic signature of the beaks of their cephalopod prey. Thus, the aims of the present study were: (1) to examine in detail the cephalopod portion of the diet of Weddell seals by means of scat analysis and (2) to assess the habitat use and trophic level of the different cephalopod prey taxa identified. From January to February 2009, a total of 48 faecal droppings were collected at Hope Bay, Antarctic Peninsula. Cephalopods were mainly represented by beaks (n = 83) which were identified to the lowest possible taxonomic level. Furthermore, subsamples of beaks were separated for further isotopic analysis. Relative abundance of stable isotopes of carbon (delta C-13) and nitrogen (delta N-15) was determined by continuous-flow isotope-ratio mass spectrometry. Cephalopods were represented uniquely by octopods of the subfamily Eledoninae. Pareledone turqueti was the dominant prey species followed by the papillated Pareledone species group and Adelieledone polymorpha. We conclude that Weddell seals preyed primarily on benthic prey resources. Furthermore, the relatively similar delta C-13 and delta N-15 values in beaks of the three octopod prey taxa suggest that these share the same type of habitat and occupy similar trophic level positions.
author address [Negri, A.; Daneri, G. A.] Museo Arg Cs Nat B Rivadavia, Div Mastozool, Ave A Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina; [Negri, A.; Coria, N. R.; Corbalan, A.] Inst Antartico Argentino, Dept Predadores Tope, Cerrito 1248,C1010AAZ, Buenos Aires, DF, Argentina; [Ceia, F.; Vieira, R.; Xavier, J. C.] Univ Coimbra, Inst Marine Res IMAR, Coimbra, Portugal; [Cherel, Y.] CNRS, Ctr Etud Biol Chize, UPR 1934, F-79360 Villiers En Bois, France; [Xavier, J. C.] British Antarctic Survey, NERC, Cambridge, England
reprint address Negri, A (reprint author), Museo Arg Cs Nat B Rivadavia, Div Mastozool, Ave A Gallardo 470,C1405DJR, Buenos Aires, DF, Argentina.; Negri, A (reprint author), Inst Antartico Argentino, Dept Predadores Tope, Cerrito 1248,C1010AAZ, Buenos Aires, DF, Argentina.
e-mail address agunegri136@gmail.com; gdaneri@macn.gov.ar
researcherid number Ceia, Filipe/A-2196-2012
orcid number Ceia, Filipe/0000-0002-5470-5183
funding agency and grant number Direccion Nacional del Antartico; Agencia Nacional de Promocion Cientifica y Tecnologica [36054]; Foundation for Science and Technology (Portugal); Portuguese Polar Program PROPOLAR
funding text This work received financial support from the Direccion Nacional del Antartico and the Agencia Nacional de Promocion Cientifica y Tecnologica (Grant: PICTO No. 36054). It was also partly funded by the Foundation for Science and Technology (Portugal) and within the Portuguese Polar Program PROPOLAR.
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cited reference count 33
publisher SPRINGER
publisher city NEW YORK
publisher address 233 SPRING ST, NEW YORK, NY 10013 USA
issn 0722-4060
29-character source abbreviation POLAR BIOL
iso source abbreviation Polar Biol.
publication date MAR
year published 2016
volume 39
issue 3
beginning page 561
ending page 564
digital object identifier (doi) 10.1007/s00300-015-1794-9
page count 4
web of science category Biodiversity Conservation; Ecology
subject category Biodiversity & Conservation; Environmental Sciences & Ecology
document delivery number DF8WD
unique article identifier WOS:000371640300013
CESAM authors