Abstract
On 5 February 1986 a humpback whale was photographed near Isla Clarión, in the Revillagigedo Archipelago, Mexico, and again 51 days later near the island of Kauai in the Hawaiian Archipelago. The straight-line distance between the two sightings is approximately 4700km. This resighting constitutes the only known instance in which the same humpback whale has been documented in two discretely different breeding areas within the same season. This finding reinforces the conclusion from other studies that the humpback whale aggregation of the Revillagigedo Archipelago constitutes a separate sub-population from mainland Mexico
Highlights
Humpback whales are found throughout the world’s oceans, and engage in one of the longest-known migrations of any mammal (Stone et al, 1990; Darling et al, 1996; Calambokidis et al, 2001)
Comparison among photographs from different study areas in the North Pacific has resulted in documentation of migratory movement across broad areas
Distribution and movement patterns of North Pacific humpback whales have been studied through satellite telemetry (Mate et al, 1998), acoustic recordings (Helweg et al, 1990; Norris et al, 1999), and genetic analysis (Baker et al, 1998)
Summary
Humpback whales are found throughout the world’s oceans, and engage in one of the longest-known migrations of any mammal (Stone et al, 1990; Darling et al, 1996; Calambokidis et al, 2001). Further analyses, involving systematic effort in all known humpback whale feeding and wintering areas of the North Pacific during five field seasons from 2004 - 2006, are currently underway (Cascadia Research, 2007).
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