PMID: 16637498Apr 28, 2006Paper

Inbreeding avoidance and the evolution of gender dimorphism in Wurmbea biglandulosa (Colchicaceae)

Evolution; International Journal of Organic Evolution
Mike RamseyRod Peakall

Abstract

How females establish in populations of cosexuals is central to understanding the evolution of gender dimorphism in angiosperms. Inbreeding avoidance hypotheses propose that females can establish and be maintained if cosexual fitness is reduced because they self-fertilize, and their progeny express inbreeding depression. Here we assess the role of inbreeding avoidance in maintaining sexual system variation in Wurmbea biglandulosa. We estimated costs of self-pollination, mating patterns, and inbreeding depression in gender monomorphic (cosexuals only) and dimorphic (males and females) populations. Costs of selfing, estimated from seed set of experimentally self- and cross-pollinated flowers, were severe in both males and cosexuals (inbreeding depression, sigma = 0.86). In a field experiment, intact males that could self produced fewer seeds than both emasculated males and females, whereas seed set of intact and emasculated cosexuals did not differ. Thus, pollinator-mediated selfing reduces fitness of males but not cosexuals under natural conditions. Outcrossing rates of males revealed substantial selfing (t = 0.68), whereas females and cosexuals were outcrossed (0.92 and 0.97). For males, progeny inbreeding coefficients exceeded...Continue Reading

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Citations

Mar 5, 2008·Evolution; International Journal of Organic Evolution·David E McCauley, Matthew S Olson
Jun 8, 2011·Evolution; International Journal of Organic Evolution·Conchita Alonso, Carlos M Herrera
Sep 5, 2006·Current Biology : CB·Deborah Charlesworth
Apr 10, 2007·Annals of Botany·Thomas R Meagher
Aug 13, 2011·Annals of Botany·Glenda Vaughton, Mike Ramsey
Jun 22, 2019·The New Phytologist·Deborah Charlesworth

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