Evol Ecol Res 8: 1475-1486 (2006)     Full PDF if your library subscribes.

Evolution of ‘maleness’ and outcrossing in a population of the self-fertilizing killifish, Kryptolebias marmoratus

Bruce J. Turner,1* Michael T. Fisher,1‡ D. Scott Taylor,2 William P. Davis3 and Bambi L. Jarrett1

1Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061,  2Brevard County Environmentally Endangered Lands Program, Melbourne, FL 32940 and  3USEPA Environmental Research Laboratory, Gulf Breeze, FL 32561, USA

Author to whom all correspondence should be addressed.
e-mail: fishgen@vt.edu


Question: Does the persistently high frequency of males in the Twin Cays population of Kryptolebias (formerly Rivulus) mamoratus (Pisces: Rivulidae), a self-fertilizing, androdioecious species, result from ecophenotypic effects or genetic divergence from other populations?

Hypothesis: Because males are easily produced in the laboratory by temperature manipulations of embryos or juveniles, their frequency in this population is environmentally induced.

Methods: Common garden experiment, two generations.

Conclusions: Genetic differences exist between the Twin Cays population and other populations in the tendency to produce males. Since males likely induce androdioecious outcrossing, and the Twin Cays population is not ancestral to others, this genetic difference may indicate a shift from predominant selfing to outcrossing, a direction not predicted by current theory.

Keywords: Atherinomorpha, clonal reproduction, Cyprinodontiformes, hermaphroditism, mating system, Rivulidae, Rivulus.

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