Abstract
Male beaugregory damselfish ( Stegastes leucostictus Muller & Troschel) were provided with artificial breeding sites to minimize environmental variability that might influence reproductive success. Of the two types of artificial sites, males defending “open sites” had twice the reproductive success of those males defending “closed sites”. When given a choice, males preferred to defend the open sites. Males defending open sites received more eggs and also had a larger proportion survive to hatching age than those defending closed sites. Egg survival appeared dependent on clutch size; males that received large initial clutches also attracted other females to lay eggs within their sites. Small clutches disappeared before reaching hatching age. The large variability in males defending the same types of sites suggests that females were selecting mates based on male quality. However, no correlation existed between male size and reproductive success.
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