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MARINE MAMMAL SCIENCE, 11(4):554-560 (October 1995) 0 1995 by the Society for Marine Mammalogy
 

Summary: Notes
MARINE MAMMAL SCIENCE, 11(4):554-560 (October 1995)
0 1995 by the Society for Marine Mammalogy
FIRST RECORDS OF HUMPBACK WHALES
INCLUDING CALVES AT GOLFO DULCE AND
ISLA DEL COCO, COSTA RICA, SUGGESTING
GEOGRAPHICAL OVERLAP OF NORTHERN AND
SOUTHERN HEMISPHERE POPULATIONS
We present the first documented records of humpback whales (Megaptera
novaeangliae), including mothers with calves, in Golfo Dulce and at Isla del
Coco, Costa Rica. These sightings suggest a possible overlap in the spatial
distribution of southern and northern hemisphere humpback whales near Costa
Rica.
Results of biopsy studies indicate that transoceanic genetic exchange has
occurred among North Pacific and Southern Ocean populations of humpback
whales. This is based on similarities in mitochondrial DNA sequence (Baker et
al. 1993, 1994). Baker et al. (1993) hypothesized that equatorial waters of
the eastern Pacific Ocean are a likely route for such interbreeding of northern
and southern hemisphere humpbacks. However, direct observational evidence
of spatial or temporal overlap of northern and southern hemisphere humpbacks

  

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

 

Collections: Environmental Sciences and Ecology