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The Journal of Heredity 2001:92(2)
© 2001 The American Genetic Association 92:167-172

Genetic Perspectives on the Natural History of Fish Mating Systems

J. A. DeWoody, and J. C. Avise

From the Department of Genetics, University of Georgia, Athens, Georgia. J. A. DeWoody is currently at the Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907-1159.

Address correspondence to J. Andrew DeWoody at the address above or e-mail: dewoody{at}fnr.purdue.edu.

Molecular analyses of bird and mammal populations have shown that social mating systems must be distinguished from genetic mating systems. This distinction is important in fishes also, where the potential for extrapair spawning and intraspecific brood parasitism is especially great. We review studies on fishes that have used molecular markers to document biological parentage and genetic mating systems in nature, particularly in species with extended parental care of offspring. On average, nest-guarding adults parented about 70–95% of their custodial offspring, and approximately one-third of the nests were cuckolded to some extent. Furthermore, nearly 10% of the assayed nests contained offspring tended by foster fathers either because of nest takeovers or egg thievery. On average, fish that provide parental care on nests spawned with more mates than did fish with internal fertilization and pregnancy. Overall, genetic markers have both confirmed and quantified the incidence of several reproductive and other social behaviors of fishes, and have thereby enhanced our knowledge of piscine natural history.


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