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- Title
Speciation in killifish and the role of salt tolerance.
- Authors
Fuller, R. C.; McGhee, K. E.; Schrader, M.
- Abstract
Species pairs whose distributions are tied to environmental conditions provide intriguing candidates for the study of ecological speciation. Here, we examine the role that adaptation to salinity has played in the divergence between two closely related species, Lucania goodei and Lucania parva, whose distributions reflect salinity ( L. goodei– fresh water, L. parva– euryhaline). We first tested whether these two species display local adaptation and, subsequently, tested for ecological, genic and behavioural isolation by performing crosses within and between L. goodei and L. parva and raising offspring under various salinities. We found strong evidence for differential adaptation to salinity and also for behavioural isolation where animals preferentially mated with conspecifics over heterospecifics. However, we found no evidence for F1 hybrid inviability. We discuss the general lack of evidence for genic isolation in teleost fish and whether this is a real phenomenon or simply a reflection of experimental design.
- Subjects
KILLIFISHES; ANIMAL ecology; ECOLOGY; RAINWATER killifish; GOODEIDAE; SALINITY; BIOLOGICAL adaptation; ANIMAL sexual behavior; SEXUAL selection
- Publication
Journal of Evolutionary Biology, 2007, Vol 20, Issue 5, p1962
- ISSN
1010-061X
- Publication type
Article
- DOI
10.1111/j.1420-9101.2007.01368.x