Abstract
The life tables of Oncopeltus fasciatus from a temperate locality (Ithaca, New York) and O. unifasciatellus from a tropical locality (Cali, Columbia) are compared. When reared under controlled conditions approximating those they experience during the summer in their natural environments, the two species exhibit remarkably similar rates of development and mortality. The temperate species, however, which begins ovipositing sooner and produces more eggs, has a higher instantaneous rate of population increase (r). These results extend some theories advanced to explain latitudinal differences in the clutch size of birds.
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