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Unprecedented Records of Guadalupe and Juan Fernández Fur Seals in the Galapagos Archipelago
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Unprecedented Records of Guadalupe and Juan Fernández Fur Seals in the Galapagos Archipelago
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Journal Article
Unprecedented Records of Guadalupe and Juan Fernández Fur Seals in the Galapagos Archipelago
2020
Overview
Páez-Rosas et al discuss the unprecedented records of Guadalupe and Juan Fernández fur seals in the Galapagos Archipelago. The Guadalupe fur seal (GFS) and Juan Fernández fur seal (JFFS) have a restricted distribution to islands in the North and South Pacific Ocean, respectively. GFS only breeds in Mexico, concentrating its population on Guadalupe and the San Benito Islands with a regional abundance of around 40,000 individuals while JFFS is limited to the Juan Fernández Archipelago in Chile with an estimated population of 20,000 animals. Both species were considered extinct by the end of the 1800s because of intense commercial hunting. However, a small number of GFS and JFFS were discovered breeding on Guadalupe Island in 1954 and Alejandro Selkirk Island in 1965, respectively. These populations grew slowly and colonized other nearby islands over time surviving in caves or on inaccessible beaches, thereby maintaining their populations and probably facilitating the increase of their genetic diversity. Here, the extralimital records of GFS and JFFS in the Eastern Tropical Pacific which occurred during the incidence of seasonal Humboldt Current near the Galapagos Archipelago when the proliferation of nutrients increases at the base of the region's food marine web is reported.
