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A set of experiments is described that tests the general hypothesis that sympatric speciation is genetically feasible whenever reproductive isolation evolves indirectly as a correlated character. We specifically test the hypothesis that disruptive selection on habitat preference can lead to sympatric speciation when individuals mate locally within their selected habitat. Drosophila melanogaster was used as a model system. A 35-generation experiment using a complex habitat maze led to complete reproductive isolation between subpopulations using different spatiotemporal habitats. The reproductive isolation that developed over the course of the experiment was a result ofoffspring returning to mate in the habitat type selected by their parents, i.e., a gradual breakdown in migration between habitats.

Introductory remarks The stimulus to hunt The hunting process .. Selection of hunting site Searching rate Kind of prey attacked The rate of capture by an individual predator Percent time spent hunting ......... Frequency of attacks Percentage of successful attacks Responses to changes in prey density Responses of predators to changes in their density Interspecific relations between predators Mathematical descriptions of predation Resume METHODS 113 114 Tests of the experimental procedure Measurement of searching rate RESULTS .... Searching rate Rate of capture Percent of time spent hunting Frequency and success of attacks The stimulus to attack Responses to changes in prey density Responses to changes in their own density Predation rate Rate of increase Woodruffia-Paramecium cycles DISCUSSION Woodruffia as a predator Comparison of the Woodruffia results with cepted generalizations Hunger as a stimulus for hunting Searching rate .

An experimental investigation of the roles of predator density, prey density, and their interaction in the control of the capture rate by the predator was conducted, with Didinium nasutum as the predator and Paramecium aurelia as the prey. An analysis of variance of the results revealed that both predator densityand prey density were potential controls and that the latter was stronger than the former. The interaction effect was not significant. It is postulated that these two controls are alternates, that the capture rate is set by whichever is the more restrictive, and that the prey density control is probably a fixed internal control. The character of the predator density control remains to be determined.

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