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Abstract:

Population size and distribution of Otaria flavescens in central and southern Chubut, Patagonia were determined by aerial censuses conducted during the breeding season in 1989 and 1995 and outside the season. Pup numbers were corrected by means of a linear regression between pup and adult male (AM) numbers obtained from terrestrial censuses carried out in 1994 and 1996. During the 1989 breeding season, 10,557 sea lions occurred at 29 locations; 2,800 (26.3%) were pups. During the 1995 breeding season, 14,887 animals were censused at 32 sites; 3,311 (22.2%) were pups. The corrected pup number increased to 4,852, indicating that around 32% is lost when counting from photographs. The corrected total number increased to 16,483; this fell to less than one half between breeding seasons (November 1990 and 1995). The 1995 breeding season census represents the highest number since 1972 (8,800) and the widest historical dispersion (37 sites year round contrasting with 13 in the late 1940s and 1972). However, the present number is about one half of the 33,000 censused about 50 yr ago. Using a correction factor developed for the north Patagonian population (1.8 x censused number) the present population size in the area can be estimated at around 29,669 individuals.

Registro:

Documento: Artículo
Título:Distribution and population size of the southern sea lion (Otaria flavescens) in central and southern Chubut, Patagonia, Argentina
Autor:Reyes, L.M.; Crespo, E.A.; Szapkievich, V.
Filiación:Lab. de Mamíferos Marinos, Centro Nacional Patagónico, Universidad Nacional de la Patagonia, Boulevard Brown s/n, 9120 Puerto Madryn, Chubut, Argentina
Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Abundance; Chubut; Otaria flavescens; Patagonia; Pup number estimation; Southern sea lion; pinniped; population size; spatial distribution; Argentina; Chubut; Patagonia; Animalia; Otaria flavescens; Otaria flavescens; Otariidae; Panthera leo; Pinnipedia
Año:1999
Volumen:15
Número:2
Página de inicio:478
Página de fin:493
DOI: http://dx.doi.org/10.1111/j.1748-7692.1999.tb00814.x
Título revista:Marine Mammal Science
Título revista abreviado:Mari. Mamm. Sci.
ISSN:08240469
CODEN:MMSCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08240469_v15_n2_p478_Reyes

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Citas:

---------- APA ----------
Reyes, L.M., Crespo, E.A. & Szapkievich, V. (1999) . Distribution and population size of the southern sea lion (Otaria flavescens) in central and southern Chubut, Patagonia, Argentina. Marine Mammal Science, 15(2), 478-493.
http://dx.doi.org/10.1111/j.1748-7692.1999.tb00814.x
---------- CHICAGO ----------
Reyes, L.M., Crespo, E.A., Szapkievich, V. "Distribution and population size of the southern sea lion (Otaria flavescens) in central and southern Chubut, Patagonia, Argentina" . Marine Mammal Science 15, no. 2 (1999) : 478-493.
http://dx.doi.org/10.1111/j.1748-7692.1999.tb00814.x
---------- MLA ----------
Reyes, L.M., Crespo, E.A., Szapkievich, V. "Distribution and population size of the southern sea lion (Otaria flavescens) in central and southern Chubut, Patagonia, Argentina" . Marine Mammal Science, vol. 15, no. 2, 1999, pp. 478-493.
http://dx.doi.org/10.1111/j.1748-7692.1999.tb00814.x
---------- VANCOUVER ----------
Reyes, L.M., Crespo, E.A., Szapkievich, V. Distribution and population size of the southern sea lion (Otaria flavescens) in central and southern Chubut, Patagonia, Argentina. Mari. Mamm. Sci. 1999;15(2):478-493.
http://dx.doi.org/10.1111/j.1748-7692.1999.tb00814.x