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Université de Fribourg

Parasite‐driven replacement of a sexual by a closely related asexual taxon in nature

Lohr, Jennifer N. ; Haag, Christoph R.

In: Ecology, 2020, vol. 101, no. 10, p. -

Asexual species are thought to suffer more from coevolving parasites than related sexuals. Yet a variety of studies do not find the patterns predicted by theory. Here, to shine light on this conundrum, we investigate one such case of an asexual advantage in the presence of parasites. We follow the frequency dynamics of sexual and asexual Daphnia pulex in a natural pond that was initially...

Université de Fribourg

How clonal are clones? A quest for loss of heterozygosity during asexual reproduction in Daphnia magna

Dukić, Marinela ; Berner, Daniel ; Haag, Christoph R. ; Ebert, Dieter

In: Journal of Evolutionary Biology, 2019, vol. 32, no. 6, p. 619–628

Due to the lack of recombination, asexual organisms are predicted to accumulate mutations and show high levels of within‐individual allelic divergence (heterozygosity); however, empirical evidence for this prediction is largely missing. Instead, evidence of genome homogenization during asexual reproduction is accumulating. Ameiotic crossover recombination is a mechanism that could lead to...

Université de Fribourg

The genomic and physiological basis of life history variation in a butterfly metapopulation

Klepsatel, Peter ; Flatt, Thomas

In: Molecular Ecology, 2011, vol. 20, no. 9, p. 1795-1798

Unravelling the mechanisms underlying variation in life history traits is of fundamental importance for our understanding of adaptation by natural selection. While progress has been made in mapping fitness-related phenotypes to genotypes, mainly in a handful of model organisms, functional genomic studies of life history adaptations are still in their infancy. In particular, despite a few...

Université de Fribourg

A Bit of Sex Stabilizes Host+Parasite Dynamics

Flatt, Thomas ; Maire, Nicolas ; Doebeli, Michael

In: Journal of Theoretical Biology, 2001, vol. 212, no. 3, p. 345-354

To date, only a few studies have focused on the effects of sex on population dynamics. Previous models have typically found that sexual reproduction dampens population fluctuations. Although asexual and sexual reproduction are just the two endpoints along a continuum of varying rates of sex, previous work has ignored the effects of intermediate degrees of sex on population dynamics. Here we study...

Consortium of Swiss Academic Libraries

A law of large numbers approximation for Markov population processes with countably many types

Barbour, A. ; Luczak, M.

In: Probability Theory and Related Fields, 2012, vol. 153, no. 3-4, p. 727-757