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The evolutionary theory of aging predicts that pelagic seabirds, which have low extrinsic mortality, should show exceptional longevity. These taxa appear to show the lowest rates of actuarial senescence among birds yet display declining reproductive performance at advanced ages. We have studied survival and reproduction of Nazca boobies (Sula granti) in the remote Galapagos Islands since 1984. We...
The evolutionary theory of aging predicts that self-maintenance functions, such as immunity, will be selectively maintained in old age when extrinsic sources of mortality are low relative to instrinsic sources. Long-lived seabirds may provide an animal model for testing this prediction. We measured serum immunoglobulin G (IgG) levels across the lifespan, especially the oldest individuals, of a wild...
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