Genetic incompatibilities in killifish and the role of environment

Research output: Contribution to journalArticlepeer-review

Abstract

Measuring reproductive isolation across multiple generations and environments is a key endeavor in speciation research because it indicates which isolating barriers currently prevent introgression and the extent to which they are intrinsic versus environmentally dependent. Here, I present data from several crosses (parental crosses, F1s, F2s, back-crosses) between two species of killifish (Lucania goodei and L. parva) that have diverged along a salinity gradient (L. goodei - freshwater, L. parva - euryhaline). Offspring were raised under high and low salinity to test for (1) extrinsic isolation, (2) intrinsic isolation manifested through genetic incompatibilities, and (3) environmentally dependent genetic incompatibilities. I found evidence for both intrinsic and extrinsic isolation, but no evidence for environmentally dependent genetic incompatibilities. The presence of extrinsic and intrinsic isolation varied among fitness measures, and all forms of reproductive isolation were asymmetric. Early egg survival was independent of salinity, but demonstrated pronounced intrinsic isolation. Both extrinsic and intrinsic isolation existed for egg hatching and survival of fry to the eating stage. Unfortunately, the order in which extrinsic and intrinsic isolation arose is unresolved. Understanding the extent to which adaptation to salinity creates multiple forms of reproductive isolation is critical for understanding diversification in many fish taxa.

Original languageEnglish (US)
Pages (from-to)3056-3068
Number of pages13
JournalEvolution
Volume62
Issue number12
DOIs
StatePublished - Dec 2008

Keywords

  • Epistasis
  • F2 breakdown
  • Fundulidae
  • Genetic incompatibility
  • Joint scaling analysis
  • Line cross analysis
  • Osmoregulation
  • Reproductive isolation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

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