Increased boat traffic in shallow water is driving humpback whale mothers and their calves farther out into the ocean (via hakaimagazine)
, humpback whales’ habitat is being pinched between increasing inshore vessel traffic and the dangers of deeper water.
Years later, after more was known about humpback habitat preferences, Pack was interested in revisiting and analyzing this data set. He had expected to see similar behavior to that documented in previous research—that the mother-calf pairs would remain closer to shore than whales without calves. “What we found was the direct opposite, which was confusing, and also kind of interesting from a scientific point of view,” says Pack.
Pack says that boats can be very noisy, which interferes with whales’ communications and disturbs the mother-calf pods. The study suggests mother-calf pods are being edged into deeper water during the day by boats, and at night, after the boat pressure has let up, are swimming back inshore. Joe Mobley, a whale researcher at the University of Hawai‘i at Mānoa who was not involved with the study, says it was good that Pack and his team were able to highlight this problem.
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