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Université de Neuchâtel

Evolutionary Ecology of the Prezygotic Stage

Bernasconi, Giorgina ; Ashman, T.-L ; Birkhead, T. R ; Bishop, J. D. D ; Grossniklaus, U ; Kubli, E ; Marshall, D. L ; Schmid, B ; Skogsmyr, I ; Snook, R. R ; Taylor, D ; Till-Bottraud, I ; Ward, P. I ; Zeh, D. W ; Hellriegel, B

In: Science, 2004, vol. 303, no. 5660, p. 971-975

The life cycles of sexually reproducing animals and flowering plants begin with male and female gametes and their fusion to form a zygote. Selection at this earliest stage is crucial for offspring quality and raises similar evolutionary issues, yet zoology and botany use dissimilar approaches. There are striking parallels in the role of prezygotic competition for sexual selection on males,...

Université de Neuchâtel

How does breeding system variation modulate sexual antagonism?

Bedhomme, Stéphanie ; Bernasconi, Giorgina ; Koene, Joris M. ; Lankinen, Åsa ; Arathi, H. S. ; Michiels, Nico K. ; Anthes, Nils

In: Biology Letters, 2009, vol. 23, no. 5, p. 660-662

The study of sexually antagonistic (SA) traits remains largely limited to dioecious (separate sex), mobile animals. However, the occurrence of sexual conflict is restricted neither by breeding system (the mode of sexual reproduction, e.g. dioecy or hermaphroditism) nor by sessility. Here, we synthesize how variation in breeding system can affect the evolution and expression of intra- and...

Université de Neuchâtel

Population size and identity influence the reaction norm of the rare, endemic plant cochlearia bavarica across a gradient of environmental stress

Paschke, Melanie ; Bernasconi, Giorgina ; Schmid, Bernhard

In: Evolution, 2002, vol. 57, no. 3, p. 496-508

Habitat degradation and loss can result in population decline and genetic erosion, limiting the ability of organisms to cope with environmental change, whether this is through evolutionary genetic response (requiring genetic variation) or through phenotypic plasticity (i.e., the ability of a given genotype to express a variable phenotype across environments). Here we address the question whether...

Université de Neuchâtel

Sexual conflict over floral receptivity

Lankinen, Åsa ; Hellriegel, Barbara ; Bernasconi, Giorgina

In: Evolution, 2007, vol. 60, no. 12, p. 2454-2465

In flowering plants, the onset and duration of female receptivity vary among species. In several species the receptive structures wilt upon pollination. Here we explore the hypothesis that postpollination wilting may be influenced by pollen and serve as a general means to secure paternity of the pollen donor at the expense of female fitness. Taking a game-theoretical approach, we examine the...