Abstract
Larval individuals from six anisopteran species were added to artificial ponds so that each pond contained an equal number and size distribution of each species. Half of these ponds were exposed to an additional anisopteran, Anax junius. Interodonate predation in Anax—free ponds was size dependent, with the smallest species, Perithemis tenera, experiencing the highest mortality. Predation in ponds containing Anax was not size dependent, but was species dependent. Plathemis lydia individuals were not significantly affected by Anax, probably due to the tendency of Plathemis to dig deeply into the sediment. Pe. tenera was shown to have a different allometric relationship between head width and body volume than the other six dragonfly species. We postulate that this is correlated with its small size and is an adaptation to increase the range of prey available to it.
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