Southern elephant seals north of the antarctic polar front.

LEWIS, M.; CAMPAGNA, C.; MARIN, M R; FERNÁNDEZ, T

ANTARCTIC SCIENCE

CAMBRIDGE UNIV PRESS

Año: 2006 vol. 18 p. 1 - 9

0954-1020

This paper reports on sightings and dispersion of individual southern elephant seals (Mirounga leonina) along the Atlantic and Pacific coasts of South America based on reports of tagged/marked sealsfrom Patagonia and of animals of unknown origin. From 154 sightings, encompassing at least 354individuals, we found that individuals dispersed to subequatorial latitudes on both sides of the continent, andto more temperate sites, in the Magellanic region of Tierra del Fuego. Nineteen sites were visited by taggedseals from the established colony of Península Valdés (PV, Argentina). PV and the smaller seal population ofthe Falklands/Malvinas were regularly connected by adults of both sexes. There were more sightings of males than females. No incipient new breeding colonies were found along the Atlantic coast of South America. Some observations coincided with places where elephant seals had been recorded or exploited in the seventeenth and eighteenth centuries. A shortage of suitable habitat for expansion and proximity to predictable food could act as a stabilizing process preventing colonization of new areas from PV. Dispersion data, coherent with population genetics, support a Patagonian elephant seal stock.This paper reports on sightings and dispersion of individual southern elephant seals (Mirounga leonina) along the Atlantic and Pacific coasts of South America based on reports of tagged/marked sealsfrom Patagonia and of animals of unknown origin. From 154 sightings, encompassing at least 354individuals, we found that individuals dispersed to subequatorial latitudes on both sides of the continent, andto more temperate sites, in the Magellanic region of Tierra del Fuego. Nineteen sites were visited by taggedseals from the established colony of Península Valdés (PV, Argentina). PV and the smaller seal population ofthe Falklands/Malvinas were regularly connected by adults of both sexes. There were more sightings of males than females. No incipient new breeding colonies were found along the Atlantic coast of South America. Some observations coincided with places where elephant seals had been recorded or exploited in the seventeenth and eighteenth centuries. A shortage of suitable habitat for expansion and proximity to predictable food could act as a stabilizing process preventing colonization of new areas from PV. Dispersion data, coherent with population genetics, support a Patagonian elephant seal stock.