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Antarctic Radiocarbon Reservoir: The Case of the Mummified Crabeater Seals (Lobodon Carcinophaga) in Bodman Cape, Seymour Island, Antarctica

Published online by Cambridge University Press:  18 July 2016

Javier Negrete ,
Esteban Soibelzon ,
Eduardo P Tonni ,
Alejandro Carlini ,
Leopoldo H Soibelzon ,
Sebastián Poljak ,
Roberto A Huarte  and
Jorge E Carbonari
Javier Negrete
Affiliation:
Dep. Biología, Mamíferos Marinos, Instituto Antártico Argentino, Cerrito 1248, C1010AAZ-Buenos Aires, Argentina.
Esteban Soibelzon*
Affiliation:
Div. Paleontología Vertebrados, Museo de La Plata, Fac. Cs. Nat. y Museo, UNLP, Paseo del Bosque s/n, 1900 La Plata, Argentina.
Eduardo P Tonni
Affiliation:
Div. Paleontología Vertebrados, Museo de La Plata, Fac. Cs. Nat. y Museo, UNLP, Paseo del Bosque s/n, 1900 La Plata, Argentina.
Alejandro Carlini
Affiliation:
Dep. Biología, Mamíferos Marinos, Instituto Antártico Argentino, Cerrito 1248, C1010AAZ-Buenos Aires, Argentina. Sadly, Dr Carlini died on 20th December 2010. We will remember him as a great person and friend who dedicated his life to the study of wildlife in Antarctica.
Leopoldo H Soibelzon
Affiliation:
Div. Paleontología Vertebrados, Museo de La Plata, Fac. Cs. Nat. y Museo, UNLP, Paseo del Bosque s/n, 1900 La Plata, Argentina.
Sebastián Poljak
Affiliation:
Centro Regional de Estudios Genómicos (UNLP), Av. Calchaquí km 23,5 (1888) Florencio Varela, Buenos Aires, Argentina.
Roberto A Huarte
Affiliation:
Laboratorio de Tritio y Carbono 14, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Buenos Aires, Argentina.
Jorge E Carbonari
Affiliation:
Centro Regional de Estudios Genómicos (UNLP), Av. Calchaquí km 23,5 (1888) Florencio Varela, Buenos Aires, Argentina.
*
Corresponding author. Email: esoibelzon@fcnym.unlp.edu.ar.
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Abstract

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At least 50% of the world's seal population is distributed in the pack-ice region surrounding Antarctica. Among the Antarctic seals, Lobodon carcinophaga (commonly known as “crabeater seals”) are the most abundant. This is a krill-feeding species, subsisting primarily on Euphausia superba. The occurrence of mummified seals has been documented since 1900 in several Antarctic regions, and different hypotheses about age and what happened to them have been proposed. Taking into account the depletion of 14C concentration in marine waters, we dated a recently deceased and a mummified L. carcinophaga along with a mollusk (Nacella concinna) collected alive from different locations around Antarctica. We discuss their relationship in light of the 14C reservoir. The age obtained for the recently deceased crabeater seals suggests a reservoir age of around 1300 yr for these waters, which is in agreement with the correction value for reservoir age obtained for the same species in the area. We applied this reservoir correction value to the conventional age of 1180 14C yr BP obtained for the mummified seal. The results indicate that the death event probably occurred within the last 100 yr. The age obtained for the mollusk specimen confirms that the correction values of the reservoir effect for the Antarctic continent vary according to geographical location and to the type of sample dated.

Type
Methods, Applications, and Developments
Information
Radiocarbon , Volume 53 , Issue 1 , 2011 , pp. 161 - 166
Copyright
Copyright © 2011 The Arizona Board of Regents on behalf of the University of Arizona 

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