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Predation and Food Web Structure along a Habitat Duration Gradient

Daniel W. Schneider
Oecologia
Vol. 110, No. 4 (1997), pp. 567-575
Published by: Springer in cooperation with International Association for Ecology
Stable URL: http://www.jstor.org/stable/4221647
Page Count: 9
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Predation and Food Web Structure along a Habitat Duration Gradient
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Abstract

Food web statistics showed a complex relationship with measures of habitat variability in temporary ponds. Connectance was highest in short-duration, highly variable habitats, and lowest in habitats of intermediate duration and variability. The number of links and links/taxon increased with increasing duration. Much of the variation in the food web statistics could be explained by a strong linear relationship between number of taxa and number of links/taxon and a quadratic relationship of taxa number with the number of links. However, after accounting for this variation, there remained a relationship of duration with links and links/taxon. The relationship between the food web statistics and duration corresponded to experimental evaluations of predation in these habitats that showed an increasing importance of predation in long-duration habitats. The food web statistics, however, missed threshold effects in the relationship between predation and habitat duration. Differences in food web statistics before and after a regional drought could be explained by a decrease in taxa number after the drought. Connectance was the most robust statistic in relation to taxa number, but was also the least sensitive to changes in habitat characteristics.

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