Postzygotic Isolation Evolves before Prezygotic Isolation between Fresh and Saltwater Populations of the Rainwater Killifish,Lucania parva
| Autor: | Beatrice L. Colon, Genevieve M. Kozak, Arthur B. Rudolph, Rebecca C. Fuller |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
0106 biological sciences
0303 health sciences education.field_of_study Natural selection Article Subject biology Ecology Population Hybrid inviability Reproductive isolation Euryhaline biology.organism_classification 010603 evolutionary biology 01 natural sciences 6. Clean water 03 medical and health sciences parasitic diseases Killifish Adaptation education Lucania parva Research Article 030304 developmental biology |
| Zdroj: | International Journal of Evolutionary Biology |
| ISSN: | 2090-052X 2090-8032 |
| DOI: | 10.1155/2012/523967 |
| Popis: | Divergent natural selection has the potential to drive the evolution of reproductive isolation. The euryhaline killifishLucania parvahas stable populations in both fresh water and salt water.Lucania parvaand its sister species, the freshwaterL. goodei, are isolated by both prezygotic and postzygotic barriers. To further test whether adaptation to salinity has led to the evolution of these isolating barriers, we tested for incipient reproductive isolation withinL. parvaby crossing freshwater and saltwater populations. We found no evidence for prezygotic isolation, but reduced hybrid survival indicated that postzygotic isolation existed betweenL. parvapopulations. Therefore, postzygotic isolation evolved before prezygotic isolation in these ecologically divergent populations. Previous work on these species raised eggs with methylene blue, which acts as a fungicide. We found this fungicide distorts the pattern of postzygotic isolation by increasing fresh water survival inL. parva, masking species/population differences, and underestimating hybrid inviability. |
| Databáze: | OpenAIRE |
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