绪论 虎鲸类型和种群(第6/8 页)

the North Atlantic， and sightings bee less frequent further east. However， a small year-round population exists in the Strait of Gibraltar， which numbered around 39 in 2011. Distinct populations may also exist off the west coast of tropical Africa， which have generalized diets.

The northwest Atlantic population is found year-round around Labrador and Newfoundland， while some individuals seasonally travel to the waters of the eastern Canadian Arctic when the ice has melted. Sightings of these whales have been documented as far south as Cape Cod and Long Island. This population is possibly continuous with orcas sighted off Greenland. Orcas are sighted year-round in the Caribbean Sea， and an estimated 267 (as of 2020) is documented in the northern Gulf of Mexico.

North Indian Ocean

Over 50 individual whales have been cataloged in the northern Indian Ocean， including two individuals that were sighted in the Persian Gulf in 2008 and off Sri Lanka in

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