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Artículo

Holocene changes in the trophic ecology of an apex marine predator in the South Atlantic Ocean

Vales, Damián GustavoIcon ; Cardona, Luis; Zangrando, Atilio Francisco JavierIcon ; Borella, FlorenciaIcon ; Saporiti, Fabiana; Prosser Goodall, Rae Natalie; Rosa de Oliveira, Larissa; Crespo, Enrique AlbertoIcon
Fecha de publicación: 02/2017
Editorial: Springer
Revista: Oecologia
ISSN: 0029-8549
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Predators may modify their diets as a result of both anthropogenic and natural environmental changes. Stable isotope ratios of nitrogen and carbon in bone collagen have been used to reconstruct the foraging ecology of South American fur seals (Arctocephalus australis) in the southwestern South Atlantic Ocean since the Middle Holocene, a region inhabited by hunter-gatherers by millennia and modified by two centuries of whaling, sealing and fishing. Results suggest that the isotopic niche of fur seals from Patagonia has not changed over the last two millennia (average for the period: δ13C2200-0BP = −13.4 ± 0.5‰, δ15N2200-0BP = 20.6 ± 1.1‰). Conversely, Middle Holocene fur seals fed more pelagically than their modern conspecifics in the Río de la Plata region (δ13C7000BP = −15.9 ± 0.6‰ vs. δ13CPRESENT = −13.5 ± 0.8‰) and Tierra del Fuego (δ13C6400-4300BP = −15.4 ± 0.5‰ vs. δ13CPRESENT = −13.2 ± 0.7‰). In the latter region, Middle Holocene fur seals also fed at a higher trophic level than their modern counterparts (δ15N6400-4300BP = 20.5 ± 0.5‰ vs. δ15NPRESENT = 19.0 ± 1.6‰). Nevertheless, a major dietary shift was observed in fur seals from Tierra del Fuego during the nineteenth century (δ13C100BP = −17.2 ± 0.3‰, δ15N100BP = 18.6 ± 0.7‰), when marine primary productivity plummeted and the fur seal population was decimated by sealing. Disentangling the relative roles of natural and anthropogenic factors in explaining this dietary shift is difficult, but certainly the trophic position of fur seals has changed through the Holocene in some South Atlantic regions.
Palabras clave: Arctocephalus Australis , Environmental Changes , Fur Seals , Historical Ecology , Hunter-Gatherers , Sealing , Stable Isotopes
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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URI: http://hdl.handle.net/11336/39111
URL: http://link.springer.com/article/10.1007%2Fs00442-016-3781-4
DOI: http://dx.doi.org/10.1007/s00442-016-3781-4
Colecciones
Articulos(INCUAPA)
Articulos de INVESTIGACIONES ARQUEOLOGICAS Y PALEONTOLOGICAS DEL CUATERNARIO PAMPEANO
Articulos(CESIMAR)
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Citación
Vales, Damián Gustavo; Cardona, Luis; Zangrando, Atilio Francisco Javier; Borella, Florencia; Saporiti, Fabiana; et al.; Holocene changes in the trophic ecology of an apex marine predator in the South Atlantic Ocean; Springer; Oecologia; 183; 2; 2-2017; 555-570
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