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Natural History, Dec, 2002 by George Cammarota
In "Bird Sees, Bird Sings" ["Samplings," September 2002], Stephan Reebs reports that the reason for the order in which various species of birds begin to sing their dawn chorus is how well they see in low light. No argument there. But I think it is important to distinguish between the reason different species take up the order they do and the reason that an order exists at all.
Order benefits all species of birds, because each one is thereby assured a turn to compete for mates, with a minimum of interspecies conflict. Given the selective pressure favoring order of some kind, disparate sensitivity to low light can then serve as the rule leading to the particular order that all the species follow.
George Cammarota San Jose, California
COPYRIGHT 2002 Natural History Magazine, Inc.
COPYRIGHT 2008 Gale, Cengage Learning
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