10.5061/DRYAD.4PQ11
MacGregor, Hannah E. A.
University of Tasmania
University of Oxford
While, Geoffrey M.
University of Tasmania
University of Oxford
Barrett, Jade
University of Oxford
PĂ©rez i de Lanuza, Guillem
University of Porto
Carazo, Pau
University of Valencia
Michaelides, Sozos
University of Oxford
Uller, Tobias
Lund University
University of Oxford
Data from: Experimental contact zones reveal causes and targets of sexual
selection in hybridizing lizards
Dryad
dataset
2017
male-male competition
Podarcis
2017-08-31T00:00:00Z
2017-08-31T00:00:00Z
en
https://doi.org/10.1111/1365-2435.12767
101086 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Divergence in sexually selected traits in allopatry should affect the
degree and direction of hybridization. However, few studies have
established the causes and targets of sexual selection during secondary
contact. Common wall lizards (Podarcis muralis) from north-central Italy
have highly exaggerated male sexual traits compared to populations in
Western Europe. Using experimental populations, we show that this creates
asymmetries in male dominance, spatial habitat use and reproductive
success upon secondary contact. Hybridization occurred almost exclusively
between males of the Italian lineage and females of the Western European
lineage. We provide evidence to suggest stronger ongoing selection on male
sexual traits within the dominant Italian lineage. However, these same
characters did not predict hybridization, and hybrid matings contributed
little to variance in male reproductive success. Instead, most hybrid
offspring were sired by Italian males displaying phenotypes associated
with lower within-lineage reproductive success. Thus, highly directional
hybridization arises because some Italian males are out-competed within
their own lineage but remain competitive relative to males of the other
lineage. This pattern of hybridization is consistent with the direction of
introgression in natural contact zones, but our data suggest that sexual
selection acting through hybridization may be weak at the leading edge of
natural hybrid zones.
MacGregoretal_Traits&Genotypes_FE-2016