Palmer, C.A. & S. Edmands. (2000). Mate choice in the face of both inbreeding and outbreeding depression in the intertidal copepod Tigriopus californicus. Marine Biology, Berlin 136(4):693-698.

106829

Palmer, C.A. & S. Edmands

2000

136(4):693-698.

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In species vulnerable to both inbreeding and outbreeding depression, individuals might be expected to choose mates at intermediate levels of genetic related- ness. Previous work on the intertidal copepod Tigriopus californicus has repeatedly shown that crosses between populations result in either no e?ect or hybrid vigor in the ®rst generation, and hybrid breakdown in the second generation. Previous work also shows that mating be- tween full siblings results in inbreeding depression. The present study again found inbreeding depression, with full sibling mating causing signi®cant ®tness declines in two of the three populations assayed. In the mate choice assays, a single female was combined with two males. Despite the costs of both inbreeding and outbreeding, mate choice showed clear inbreeding avoidance but no clear pattern of outbreeding avoidance. This lack of outbreeding avoidance may be attributed either to the temporary increase in ®tness in the F1 generation or to the absence of selection for premating isolation in wholly allopatric populations with infrequent migration. If this inability to avoid unwise matings is common to other taxa, it may contribute to the problem of out- breeding depression when allopatric populations are mixed together.

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