The adaptive significance of population differentiation in offspring size of the least killifish, Heterandria formosa

TitelThe adaptive significance of population differentiation in offspring size of the least killifish, Heterandria formosa
MedientypJournal Article
Jahr der Veröffentlichung2013
AutorenLeips, J., F. Rodd, and J. Travis
JournalEcology and evolution
Volume3
Seitennummerierung948-60
Veröffentlichungsdatum04
Zusammenfassung

We tested the hypothesis that density-dependent competition influences the evolution of offspring size. We studied two populations of the least killifish (Heterandria formosa) that differ dramatically in population density; these populations are genetically differentiated for offspring size, and females from both populations produce larger offspring when they experience higher social densities. To look at the influences of population of origin and relative body size on competitive ability, we held females from the high-density population at two different densities to create large and small offspring with the same genetic background. We measured the competitive ability of those offspring in mesocosms that contained either pure or mixed population treatments at either high or low density. High density increased competition, which was most evident in greatly reduced individual growth rates. Larger offspring from the high-density population significantly delayed the onset of maturity of fish from the low-density population. From our results, we infer that competitive conditions in nature have contributed to the evolution of genetically based interpopulation differences in offspring size as well as plasticity in offspring size in response to conspecific density.

The adaptive significance of population differentiation in offspring size of the least killifish, Heterandria formosa (PDF Download Available). Available from: https://www.researchgate.net/publication/236267512_The_adaptive_signific... [accessed Sep 26, 2017].




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