The distribution pattern of an organism in its niche is one of its most basic ecological attributes, whereas the forces shaping these patterns are far from obvious. Previous theories suggested that competition between species was an integral factor in shaping distribution patterns of tadpoles in ponds. But studies conducted by the author, among others, fail to support this view. The author explains why predation and pond permanence might have more to do with tadpole distributions than competition. The author also shows how being effective at dodging predators imposes certain behavioral and life-history constraints on the tadpoles.
Timing is everything for amphibians living in temporary ponds.
These Australian tadpoles of the genus Crinia did not complete metamorphosis before their pond dried up and have suffered the consequences. The relative permanence of a body of water is but one of the factors shaping the life histories of aquatic animals. Ecologists are coming to understand how the interplay between such forces helps determine which animals dwell in which habitats, and by extension dictates community structure.