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Neutral processes forming large clones during colonization of new areas

Artikel i vetenskaplig tidskrift
Författare Marina Rafajlovic
David Kleinhans
C. Gulliksson
Johan Fries
Daniel Johansson
Angelica Ardehed
Lisa Sundqvist
Ricardo. T. Pereyra
Bernhard Mehlig
Per Jonsson
Kerstin Johannesson
Publicerad i Journal of Evolutionary Biology
Volym 30
Nummer/häfte 8
Sidor 1544-1560
ISSN 1010061X
Publiceringsår 2017
Publicerad vid Institutionen för marina vetenskaper
Linnécentrum för marin evolutionsbiologi (CEMEB)
Institutionen för biologi och miljövetenskap, Tjärnö marinbiologiska laboratorium
Institutionen för biologi och miljövetenskap
Institutionen för fysik (GU)
Sidor 1544-1560
Språk en
Länkar dx.doi.org/10.1111/jeb.13124
Ämnesord asexual wave, Fucus radicans, gene surfing, invasive species, long-range dispersal, post-glacial expansion, transient effects
Ämneskategorier Evolutionsbiologi

Sammanfattning

© 2017 The Authors. Journal of Evolutionary Biology Published by John Wiley & Sons ltd on Behalf of European Society for Evolutionary Biology. In species reproducing both sexually and asexually clones are often more common in recently established populations. Earlier studies have suggested that this pattern arises due to natural selection favouring generally or locally successful genotypes in new environments. Alternatively, as we show here, this pattern may result from neutral processes during species’ range expansions. We model a dioecious species expanding into a new area in which all individuals are capable of both sexual and asexual reproduction, and all individuals have equal survival rates and dispersal distances. Even under conditions that favour sexual recruitment in the long run, colonization starts with an asexual wave. After colonization is completed, a sexual wave erodes clonal dominance. If individuals reproduce more than one season, and with only local dispersal, a few large clones typically dominate for thousands of reproductive seasons. Adding occasional long-distance dispersal, more dominant clones emerge, but they persist for a shorter period of time. The general mechanism involved is simple: edge effects at the expansion front favour asexual (uniparental) recruitment where potential mates are rare. Specifically, our model shows that neutral processes (with respect to genotype fitness) during the population expansion, such as random dispersal and demographic stochasticity, produce genotype patterns that differ from the patterns arising in a selection model. The comparison with empirical data from a post-glacially established seaweed species (Fucus radicans) shows that in this case, a neutral mechanism is strongly supported.

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