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Are assortative mating and genital divergence driven by reinforcement?

Artikel i vetenskaplig tidskrift
Författare J. Hollander
M. Montano-Rendon
G. Bianco
X. Yang
A. M. Westram
L. Duvaux
D. G. Reid
Roger Butlin
Publicerad i Evolution Letters
Volym 2
Nummer/häfte 6
Sidor 557-566
ISSN 2056-3744
Publiceringsår 2018
Publicerad vid Institutionen för marina vetenskaper
Sidor 557-566
Språk en
Länkar dx.doi.org/10.1002/evl3.85
Ämnesord genitalia, gene-flow, reinforcement, reproductive character displacement, speciation, Littorinidae, species gastropoda, speciation, patterns, evolution, displacement, littorinidae, coevolution, morphology, selection, support
Ämneskategorier Utvecklingsbiologi, Marin ekologi

Sammanfattning

The evolution of assortative mating is a key part of the speciation process. Stronger assortment, or greater divergence in mating traits, between species pairs with overlapping ranges is commonly observed, but possible causes of this pattern of reproductive character displacement are difficult to distinguish. We use a multidisciplinary approach to provide a rare example where it is possible to distinguish among hypotheses concerning the evolution of reproductive character displacement. We build on an earlier comparative analysis that illustrated a strong pattern of greater divergence in penis form between pairs of sister species with overlapping ranges than between allopatric sister-species pairs, in a large clade of marine gastropods (Littorinidae). We investigate both assortative mating and divergence in male genitalia in one of the sister-species pairs, discriminating among three contrasting processes each of which can generate a pattern of reproductive character displacement: reinforcement, reproductive interference and the Templeton effect. We demonstrate reproductive character displacement in assortative mating, but not in genital form between this pair of sister species and use demographic models to distinguish among the different processes. Our results support a model with no gene flow since secondary contact and thus favor reproductive interference as the cause of reproductive character displacement for mate choice, rather than reinforcement. High gene flow within species argues against the Templeton effect. Secondary contact appears to have had little impact on genital divergence.

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