Coexistence of two competing corixid species (Heteroptera) in an archipelago of temporary rock pools

Summary Coexistence of Callicorixa producta and Arctocorisa carinata in an archipelago of rock pools appears to be facilitated by division of the environment on the time axis. To test this, a hypothesis is built on r-K theory. As A. carinata is twice the size of C. producta it is expected that the former species is more K-selected living in more permanent pools where food resources are limiting and competition strong. The smaller C. producta is expected to prefer newly refilled pools with abundant food, and thus to be more r-selected. Gathered test data on 17 life history and population ecological features agree with the prediction. It is also shown that the both rock-pool corixids are more r-selected than other species of the family.