Bowheads are magnificent creatures that may reach 100 tons and spend their long lives in cold northern waters. As discovered by George and others, some bowheads swimming by today may have also been passing this point when Thomas Jefferson slept in the White House.
Few people know as much about Balaena mysticetus as Craig George. He migrated to Barrow in the late 1970s and has studied the creatures since 1980, a time when scientists knew little about bowheads. The animals are so important for northern indigenous cultures that people evolved around using bowhead bodies for food, bowhead oil to light their lamps and bowhead bones to build shelters from the cold and constant wind.
George — tanned, solid and rugged as a walrus — recently completed his doctorate at the University of Alaska Fairbanks. With his 168-page thesis, he has condensed three decades of accompanying Inupiat hunters while they harvested whales and has refined his experiences into insights on bowhead biology. Here are a few highlights, among many:
- Bowheads can go without eating for more than one year (1,000 times longer than a mouse).
- Bowheads can live to 200 years old in part because the whales evolved in cold water without much food. "These stressors may have led to slow growth, delayed maturity and subsequently extended longevity to ensure reproductive success," George wrote.
- So efficient is the bowhead's foot of blubber insulation that bowhead skin temperatures are about equal to the surrounding frigid ocean, while their internal temperature remains about 33.7 degrees Celsius (92.7 degrees F).
- Bowheads have an incredible system for shedding excess heat that involves the flukes of the tail, the roof of the mouth and a bowhead's pickup truck-size tongue. "The body temperatures for pursued whales . . . were not elevated. In fact, the lowest temperature was for the whale pursued (by whale hunters) the longest," George wrote.
Back on the Perch, it is a slow day for bowhead watching. Curtains of fog open and close above the open water through which the bowheads are swimming. George, Pierce and another watcher saw 18 whales yesterday, along with a polar bear that padded within a few dozen feet of the Perch before wandering off. We see neither whales nor bears at the Perch today (though the bears will appear for us later at a pile of whale bones near Point Barrow).
After deciding to dismantle the canvas windbreak material from around the Perch, George scribbles the day's result in his notebook. On ice steps sprinkled with gravel to enhance grip, George and Pierce descend from the Perch for the final time in 2010 (they often complete the spring whale count in late May). Soon, the sea ice that supports it will melt, and that impressive structure will vanish.
In a few hours, George will return to his office north of Barrow and enter his data from another year of routing snowmachine trails through sea ice, building towers from ice blocks, shooing off polar bears and standing in greasy boots alongside village whaling captains as they process their catch. For all his knowledge on bowhead whales, George in his thesis wrote that he would have learned much less without the people whose ancestors were hunting the whales right here when Jesus Christ was still walking the planet.
"The Eskimo whale hunters, captains and crews deserve great credit — perhaps singular credit — as without their support this research would have been impossible. They supported me in the field, fed me maktak (blubber), offered ideas and supported the Department's seemingly esoteric research for 30 years. They taught me more whale biology than I will ever teach them."
Ned Rozell writes the Alaska Science Forum, provided as a public service by the Geophysical Institute at University of Alaska Fairbanks in cooperation with the UAF research community. Rozell is a science writer at the institute.