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dc.contributor.author
Ciancio Blanc, Javier Ernesto
dc.contributor.author
Yorio, Pablo Martin
dc.contributor.author
Buratti, Claudio César
dc.contributor.author
Alvarez Colombo, Gustavo Luis
dc.contributor.author
Frere, Esteban
dc.date.available
2022-08-17T15:53:34Z
dc.date.issued
2021-07
dc.identifier.citation
Ciancio Blanc, Javier Ernesto; Yorio, Pablo Martin; Buratti, Claudio César; Alvarez Colombo, Gustavo Luis; Frere, Esteban; Isotopic niche plasticity in a marine top predator as indicator of a large marine ecosystem food web status; Elsevier Science; Ecological Indicators; 126; 107687; 7-2021; 1-9
dc.identifier.issn
1470-160X
dc.identifier.uri
http://hdl.handle.net/11336/165851
dc.description.abstract
As marine ecosystems are harvested or modified by anthropogenic or natural factors, there is an increasing demand for indicators of trophic web health or status. The Magellanic Penguin (Spheniscus magellanicus) is a widely distributed species that forages in the Patagonian Shelf. During breeding, this species is a central-place forager that feeds mainly on schooling fish, with Argentine anchovy (Engraulis anchoita) being the dominant prey in the north and Fuegian sprat (Sprattus fuegensis) in the south of the Argentine Patagonian distribution (40–55°S). Like most forage fish, both prey species display large natural interannual recruitment fluctuations. We used stable isotope analysis of adult Magellanic penguin blood obtained at twelve colonies along its Patagonian latitudinal range to assess changes in isotopic niche and in trophic level as a response to interannual changes in abundance and spatial segregation of forage fish size classes, respectively. Magellanic penguins showed large isotopic niche fluctuations among breeding seasons, explained by the contribution of forage fish in their diet. Furthermore, the size of the isotopic niche negatively correlated with forage fish biomass estimated from acoustic surveys and with their contribution in penguin diet. We defined an isotopic niche size threshold that indicates low abundance of forage fish in nearby feeding grounds. In addition, the trophic level of Magellanic penguins increased with latitude, which corresponds to the size-distribution of both main forage fish species, showing that penguins from different colonies target different size classes of their main prey. We present here a simple and easy to implement indicator to monitor the status of the base of the food web in one of the most productive marine areas in the world, which constitutes the feeding ground of a diverse group of high trophic level predators and sustains large-scale fisheries.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
FORAGE FISH
dc.subject
MAGELLANIC PENGUIN
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MARINE SENTINELS
dc.subject
STABLE ISOTOPES
dc.subject.classification
Ecología
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Isotopic niche plasticity in a marine top predator as indicator of a large marine ecosystem food web status
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-16T18:02:25Z
dc.journal.volume
126
dc.journal.number
107687
dc.journal.pagination
1-9
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Ciancio Blanc, Javier Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil
Fil: Yorio, Pablo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.description.fil
Fil: Buratti, Claudio César. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina
dc.description.fil
Fil: Alvarez Colombo, Gustavo Luis. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina
dc.description.fil
Fil: Frere, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral. Unidad Académica Caleta Olivia. Centro de Investigaciones Puerto Deseado; Argentina
dc.journal.title
Ecological Indicators
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.ecolind.2021.107687
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1470160X21003526
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