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More whales moving north through Bering Strait

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Scientists see changes in the way marine mammals use the Bering Strait. Photo courtesy NASA.

Scientists say mitigation needed to protect marine life in the region

Staff Report

FRISCO — American and Russian scientists studying the Bering Strait say that global warming is changing the way marine mammals use the area. Species at home farther south are using the narrow passage to the Arctic Ocean much more often, the researchers said after monitoring the area for three years with underwater microphones.

The recordings show Arctic beluga and bowhead whales migrating seasonally through the region from the Arctic south to spend winter in the Bering Sea. They also detect large numbers of sub-Arctic humpback, fin and killer whales traveling north through the Bering Strait to feed in the biologically rich Chukchi Sea.

“It’s not particularly surprising to those of us who work up in the Arctic,” said Kate Stafford, an oceanographer with the University of Washington’s Applied Physics Laboratory. “The Arctic seas are changing. We are seeing and hearing more species, farther north, more often. And that’s a trend that is going to continue.”

Stafford placed microphones below the water’s surface and recorded in summer and early winter from 2009 to 2012 as part of a U.S.-Russian scientific collaboration. Melodious humpback whale songs showed up regularly on recordings into late fall. Fin and killer whales, which are southern species that seldom travel into Arctic waters, were heard into early November.

“These animals are expanding their range,” Stafford said. “They’re taking advantage of regions in seasons that they may not have previously.”

The recordings also picked up ships using the ice-free summers to travel through two international shipping lanes. This poses an increased risk of collisions between whales and ships, and of noise pollution.

“Marine mammals rely primarily on sound to navigate, to find food and to find mates. Sound is their modality,” Stafford said. “If we increase the ambient sound level, it has the potential to reduce the communication range of cetaceans and all marine mammals.”

A recent paper by Stafford and other scientists includes visual sightings of killer whales, a quieter southern-dwelling whale, just north of the strait in the southern Chukchi Sea. Killer whales are now seen fairly regularly in this area, which is being considered for oil and gas exploration.

“The Arctic areas are changing,” Stafford said. “They are becoming more friendly to sub-Arctic species, and we don’t know how that will impact Arctic whales. Will they be competitors for food? Will they be competitors for habitat? Will they be competitors for acoustic space, for instance these humpbacks yapping all the time in the same frequency band that bowheads use to communicate? We just don’t know.”

Stafford supports the idea of slowing ship speeds in the Bering Strait, reducing motor noise and the chance of ship strikes.

Another suggestion to protect whales builds on tagging work showing that bowhead whales tend to travel up the U.S. side on the way north in the spring and on the Russian side on their way back in the fall. The proposal suggests that ships follow the American coast in the fall and the Russian coast in the spring to reduce interactions between ships and whales.

Still to be explored is whether the increased whale travel through the region is due to rising whale populations, expanded ranges, or both. Logbooks from Soviet whaling ships in the mid-to-late 20th century report sub-Arctic whales in the region, but none were seen from about 1980 to 2010.

“The question is, are these whale populations recovering and so they’re reoccupying former habitat, or are they actually invading the Arctic because they can, because there is less seasonal sea ice?” Stafford said.

Collaborators on the research are Janet Clarke at Leidos Inc. and Sue Moore at the National Oceanic and Atmospheric Administration. The research was funded by the U.S. National Science Foundation, the National Oceanic and Atmospheric Administration, and the Interior Department’s Bureau of Ocean and Energy Management.

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