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More things are dying more often

from Bloomberg Businessweek

Biologists came up with the idea of a "portfolio effect" more than 15 years ago, as a useful model — borrowed from finance — to explain the relationship between diversity and stability in living systems. The more species there are in an ecosystem, the more stable it should be. A finance analogy is also helpful because animal populations sometimes crash like stock prices do. Now, a new paper in the Proceedings of the National Academy of Sciences may make it easier to investigate why these ecosystem crashes happen, by amassing into one place 75 years of data about fish, marine mammals, birds, reptiles and others. more

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