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dc.contributor.author
Eder, Elena Beatriz
dc.contributor.author
Muelbert, Mônica M.C.
dc.contributor.author
Hindell, Mark A.
dc.contributor.author
Davis, Randall W.
dc.contributor.author
Rodríguez, Diego Hernán
dc.contributor.author
Lewis, Mirtha Noemi
dc.date.available
2020-06-23T15:29:48Z
dc.date.issued
2019-06
dc.identifier.citation
Eder, Elena Beatriz; Muelbert, Mônica M.C.; Hindell, Mark A.; Davis, Randall W.; Rodríguez, Diego Hernán; et al.; Foraging strategies of female elephant seals from Península Valdés, Patagonia, Inferred from whisker stable isotope signatures of their pups; European Association for Aquatic Mammals; Aquatic Mammals; 45; 1; 6-2019; 1-13
dc.identifier.issn
0167-5427
dc.identifier.uri
http://hdl.handle.net/11336/107925
dc.description.abstract
The foraging strategies of gestating female elephant seals (Mirounga leonina) from Península Valdés, Patagonia, were assessed by analyzing the values of stable isotopes of carbon (C) and nitrogen (N) from whiskers of 60 weanlings as a proxy for maternal spatial niche utilization. The data were combined with isotopic values and at-sea satellite locations of juvenile seals and adult female satellite tracks to provide classifications of the likely foraging strategies of the mothers of the studied pups. Based on at-sea locations during the austral summer, females foraged in oceanic waters while juveniles foraged both in neritic and in oceanic habitats. Weanling isotopic values (n = 60 pups) ranged from -19.9 to -14.8? for C and from 10.6 to 18.9? for N. The degree of variation of spatial niche distribution exhibited individual patterns of habitat use over time and revealed significant intra-population differences. Ten percent of the individuals exhibited neritic maternal for-aging (δ 13 C = -15.6 ± 0.5?, δ 15 N = 17.3 ± 1.1?) and high consistency, thus suggesting specialization (%CV δ 13 C values = 0.3 to 2.2), while 90% of the individuals exhibited oceanic maternal for-aging (δ 13 C = -17.9 ± 0.7?, δ 15 N = 12.4 ± 0.5). Additionally, oceanic maternal foraging could be further classified to distinguish broader individual variability: 58% were specialists (%CV = 0.03 to 2.2), 30% were intermediate specialists-general-ists (%CV = 2.5 to 4.5), and 12% were general-ists (%CV = 5.0 to 7.3). The prevailing strategy for females was oceanic foraging as exhibited by location at sea and the greater extent of oceanic habitats (88%) potentially available for forag-ing. At the population level, the existence of both alternate foraging strategies and high individual variability exhibited by gestating females in a high-quality foraging area such as the oceanic environment of the Argentine Basin may confer an ecological edge to these females to succeed in a less predictable (although fairly rich) environment, thus influencing population trends.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
European Association for Aquatic Mammals
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HABITAT USE
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INDIVIDUAL SPECIALIZATION
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NERITIC/OCEANIC FORAGING STRATEGIES
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STABLE ISOTOPES
dc.subject.classification
Ecología
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Foraging strategies of female elephant seals from Península Valdés, Patagonia, Inferred from whisker stable isotope signatures of their pups
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-06-22T14:21:15Z
dc.journal.volume
45
dc.journal.number
1
dc.journal.pagination
1-13
dc.journal.pais
Países Bajos
dc.description.fil
Fil: Eder, Elena Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Muelbert, Mônica M.C.. Universidade Federal Do Rio Grande.; Brasil. University of Tasmania; Australia
dc.description.fil
Fil: Hindell, Mark A.. University of Tasmania; Australia
dc.description.fil
Fil: Davis, Randall W.. Texas A&M University; Estados Unidos
dc.description.fil
Fil: Rodríguez, Diego Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
dc.description.fil
Fil: Lewis, Mirtha Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
dc.journal.title
Aquatic Mammals
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1578/AM.45.1.2019.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aquaticmammalsjournal.org/index.php?option=com_content&view=article&id=1822:foraging-strategies-of-female-elephant-seals-from-peninsula-valdes-patagonia-inferred-from-whisker-stable-isotope-signatures-of-their-pups&catid=173&Itemid=326
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