Pollen limitation and its influence on natural selection through seed set.

Autor: Bartkowska MP; Department of Biology, Life Sciences Centre, Dalhousie University, Halifax, NS, Canada., Johnston MO; Department of Biology, Life Sciences Centre, Dalhousie University, Halifax, NS, Canada.
Jazyk: angličtina
Zdroj: Journal of evolutionary biology [J Evol Biol] 2015 Nov; Vol. 28 (11), pp. 2097-105. Date of Electronic Publication: 2015 Sep 21.
DOI: 10.1111/jeb.12741
Abstrakt: Stronger pollen limitation should increase competition among plants, leading to stronger selection on traits important for pollen receipt. The few explicit tests of this hypothesis, however, have provided conflicting support. Using the arithmetic relationship between these two quantities, we show that increased pollen limitation will automatically result in stronger selection (all else equal) although other factors can alter selection independently of pollen limitation. We then tested the hypothesis using two approaches. First, we analysed the published studies containing information on both pollen limitation and selection. Second, we explored how natural selection measured in one Ontario population of Lobelia cardinalis over 3 years and two Michigan populations in 1 year relates to pollen limitation. For the Ontario population, we also explored whether pollinator-mediated selection is related to pollen limitation. Consistent with the hypothesis, we found an overall positive relationship between selection strength and pollen limitation both among species and within L. cardinalis. Unexpectedly, this relationship was found even for vegetative traits among species, and was not found in L. cardinalis for pollinator-mediated selection on nearly all trait types.
(© 2015 European Society For Evolutionary Biology. Journal of Evolutionary Biology © 2015 European Society For Evolutionary Biology.)
Databáze: MEDLINE
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