Advances in the Study of Behavior, Vol. 19 by Peter J. B. Slater, Jay S. Rosenblatt, Colin Beer

By Peter J. B. Slater, Jay S. Rosenblatt, Colin Beer

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The logic of the experiment is as follows. Nest predation is the single most important factor reducing reproductive success (see Sections V and VI,A), and the cost of choosing an unsafe nest site may often be even higher than that of choosing an already-mated male. In both cases, however, females may expect a reduction in fitness. In general, pied flycatchers prefer small hole entrances. In a study in deciduous forest (in 1984), females were offered a choice between boxes with entrance sizes of 30, 35, and 40 mm.

Lower survival of females or offspring). However, the finding that secondary females did not produce fewer offspring than monogamous females in the wood warbler makes it difficult to explain polyterritorial polygyny in this species in terms of deception. Instead, Temrin and Arak (1989) suggested that polyterritoriality may confer advantages on males because this spreads the risk of nest predation (see Section VI,B); in the wood warbler case males clearly benefit from being polygynous (Temrin, 1988).

J . BARNARD increase the fitness of a discrimination allele other than by simply providing a guide as to who is likely to share copies of it. It may, for instance, facilitate genetic complementarity (the bringing together of adaptively complementary genotypes) between mates or aggregation in times of danger (see Section III), in which case the discrimination allele spreads through its consequences for the survival and reproductive success of its immediate bearer. Not all forms of kin discrimination, therefore, can be categorized as cobearer discrimination.

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