Migration and species diversity in the tropics.
If the young of a dominant species are subjected to disproportionately heavy predation, this, together with a limitation on food, can promote a high species diversity. This is seen among tropical birds, which are simultaneously exposed to both conditions to a far greater degree than are Temperate Zone species. Migration to the Temperate Zones during the spring provides a release from these restraints, while also precluding breeding in the Tropics.
Zoology Department, Duke University, Durham, North Carolina 27706.
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Klopfer
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Rubenstein
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Ridgely
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Barnett