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Resident orcas can be divided into at least three distinct communities; northern, southern and southern Alaskan. Southern Alaskan resident orcas are distributed from southeastern Alaska to the Kodiak Archipelago and number over 700 individuals. These whales consist of two interbreeding clans distinguished by acoustic calls and whose ranges ...
The southern resident orcas, also known as the southern resident killer whales (SRKW), are the smallest of four communities of the exclusively fish-eating ecotype of orca in the northeast Pacific Ocean. The southern resident orcas form a closed society with no emigration or dispersal of individuals, and no gene flow with other orca populations. [1]
Southern residents from pod J. The primary range of the Southern resident orcas stretches approximately from the Strait of Juan de Fuca and the south coast of Vancouver Island to the Tacoma Narrows and occasionally Hood Canal, with seasonal ranges encompassing the Pacific coast from British Columbia to Monterey Bay. [3]
The fight lasted for three hours and ended with the whales giving up and swimming away into the fog.
Like other delphinids, orcas are very vocal animals. They produce a variety of clicks and pulsed calls that are used for echolocation and communication. Much of the time, resident orcas in the northeast Pacific are more vocal than Bigg's (transient) orcas living in the same waters.
Residents feed primarily on Chinook and chum salmon, which are insensitive to orca calls (inferred from the audiogram of Atlantic salmon). In contrast, the marine mammal prey of transients hear whale calls well and thus transients are typically silent. [ 125 ]