Abstract
A study of island and mainland populations of Drosophila algonquin in Maine was undertaken in order to detect any genetic incompatibility between them. Inbreeding has significant deleterious effects on the egg to adult survival of these flies, but not on their developmental rate. Although island populations probably are descended from a small number of founders and are much smaller than those on the mainland, they manifest no deleterious consequences of inbreeding. In fact, offspring produced by island derived females have significantly faster development than those produced by mainland females. Island and mainland derived flies show no evidence of genetic incompatibility, as the number, developmental time, and sex ratio of progeny produced by island x mainland crosses were not significantly different from those produced by intra-population crosses. Hence, island populations of D. algonquin show no evidence of having undergone genetic revolutions.
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