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MARINE MAMMAL SCIENCE, 10(4):484485 (October 1994) 0 1994 by the Society for Marine Mammalogy
 

Summary: MARINE MAMMAL SCIENCE, 10(4):484485 (October 1994)
0 1994 by the Society for Marine Mammalogy
FIRST RECORD OF A SEA LION,
ZALOPHUS CALIFORNIANUS, AT
ISLA DEL COCO, COSTA RICA
This note reports the first sighting of a sea lion (Zalophus californianus) at
Isla de1 Coca (05"33'N, 87"3O'W), Costa Rica, about 730 km northeast of the
Galapagos Islands. Isla de1 Coca is a small (24 km2), isolated, and uninhabited
island in the eastern `tropical Pacific Ocean, approximately 500 km SW of the
Pacific coast of Costa Rica.
From February to August 1993, marine mammals occurring around the
island were recorded as part of a larger field study on dolphin behavior. The
sea lion was sighted once, on 10 February 1993 at 1100. The individual was
determined to be a young male based on a photograph showing the development
of a cranial sagittal crest (Orr et al. 1970). The animal was moving north within
10 m of the east coast of Manuelita, an islet 500 m north of Isla de1 Coca,
where the animal was last seen. The nearest sea lion population to Isla de1 Coca
is at the Galapagos Islands (OO"N, 9 low>, where the Galapagos sea lion (Z.
c. wollebaeki) breeds (Eibl-Eibesfeldt 1984). The California sea lion population
(Z. c. californianus) migrates primarily to the north (Bartholomew and Hubbs

  

Source: Acevedo, Alejandro - Department of Biology, Western Washington University

 

Collections: Environmental Sciences and Ecology