Fellows in the News

How much death can a species tolerate? Researchers have estimated the number of North Atlantic right whales that could be killed every year while still maintaining a stable population. “That number is 0.9,” says Sarah Sharp, from the International Fund for Animal Welfare. Six have died this month alone. “The species cannot sustain these kinds of losses. We’re seriously worried that extinction is in the all-too-near future.”

Aside from Punctuation, it’s still unclear why the other five whales died. Wolverine’s necropsy was inconclusive, and the other four have yet to be examined. Natural causes are unlikely: None of these individuals were anywhere close to the species’ estimated life span of 80 to 100 years. And just last week, Sharp and her colleagues published a paper that analyzed the deaths of 70 North Atlantic right whales since 2003. In the 43 cases where the team could determine a cause of death, 38 were due to just two causes—ship strikes, and entanglements.

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