In this July 9, 2014 photo, an adult humpback whale breaches in Lynn Canal near Juneau. (Michael Penn | Juneau Empire File)

In this July 9, 2014 photo, an adult humpback whale breaches in Lynn Canal near Juneau. (Michael Penn | Juneau Empire File)

Food chain disruption eyed in Hawaii whale sighting decline

Issue likely caused by warmer ocean temperatures in Alaska

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