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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

Late glacial and Holocene Ostracoda from the Melilla cold-water coral mound field

Pirkenseer, Claudius M. ; Spezzaferri, Silvia ; Stalder, Claudio

In: Swiss Journal of Geosciences, 2018, vol. 111, no. 3, p. 549–560

The ostracod assemblages from sediment core TTR17-401G recovered from the Melilla cold-water coral mound field in the eastern Alboran Sea spanning the last 13 ka are analysed quantitatively, taxonomically and palaeoecologically. The core can be subdivided in three distinct assemblages linked to environmental shifts during the Younger Dryas and the Bølling–Allerød interstadial. A total of...

Université de Fribourg

Invasive alien plants benefit more from clonal integration in heterogeneous environments than natives

Wang, Yong-Jian ; Müller-Schärer, Heinz ; Kleunen, Mark van ; Cai, Ai-Ming ; Zhang, Ping ; Yan, Rong ; Dong, Bi-Cheng ; Yu, Fei-Hai

In: New Phytologist, 2017, vol. 216, no. 4, p. 1072–1078

What confers invasive alien plants a competitive advantage over native plants remains open to debate. Many of the world's worst invasive alien plants are clonal and able to share resources within clones (clonal integration), particularly in heterogeneous environments. Here, we tested the hypothesis that clonal integration benefits invasive clonal plants more than natives and thus confers...

Consortium of Swiss Academic Libraries

Genetic variation and covariation of aphid life-history traits across unrelated host plants

Vorburger, C.

In: Bulletin of Entomological Research, 2008, vol. 98, no. 6, p. 543-553