10.5061/DRYAD.7TP60
Botero-Delgadillo, Esteban
University of Chile
Quirici, Verónica
University of Chile
Poblete, Yanina
University of Chile
Cuevas, Élfego
University of Chile
Kuhn, Sylvia
Max Planck Institute for Ornithology
Girg, Alexander
Max Planck Institute for Ornithology
Teltscher, Kim
Max Planck Institute for Ornithology
Poulin, Elie
University of Chile
Kempenaers, Bart
Max Planck Institute for Ornithology
Vasquez, Rodrigo A.
University of Chile
Data from: Variation in fine-scale genetic structure and local dispersal
patterns between peripheral populations of a South American passerine bird
Dryad
dataset
2018
Fine-scale genetic structure
capture-mark-recapture
apparent survival
2018-08-07T00:00:00Z
2018-08-07T00:00:00Z
en
https://doi.org/10.1002/ece3.3342
118709 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The distribution of suitable habitat influences natal and breeding
dispersal at small spatial scales, resulting in strong micro-geographic
genetic structure. Although environmental variation can promote
inter-population differences in dispersal behavior and local spatial
patterns, the effects of distinct ecological conditions on within-species
variation in dispersal strategies and in fine-scale genetic structure
remain poorly understood. We studied local dispersal and fine-scale
genetic structure in the thorn-tailed rayadito (Aphrastura spinicauda), a
South American bird that breeds along a wide latitudinal gradient. We
combine capture-mark-recapture data from eight breeding seasons and
molecular genetics to compare two peripheral populations with contrasting
environments in Chile: Navarino Island, a continuous and low density
habitat, and Fray Jorge National Park, a fragmented, densely populated and
more stressful environment. Natal dispersal showed no sex bias in
Navarino, but was female-biased in the more dense population in Fray
Jorge. In the latter, male movements were restricted and some birds seemed
to skip breeding in their first year, suggesting habitat saturation.
Breeding dispersal was limited in both populations, with males being more
philopatric than females. Spatial genetic autocorrelation analyses using
13 polymorphic microsatellite loci confirmed the observed dispersal
patterns: a fine-scale genetic structure was only detectable for males in
Fray Jorge for distances up to 450 m. Furthermore, two-dimensional
autocorrelation analyses and estimates of genetic relatedness indicated
that related males tended to be spatially clustered in this population.
Our study shows evidence for context-dependent variation in natal
dispersal and corresponding local genetic structure in peripheral
populations of this bird. It seems likely that the costs of dispersal are
higher in the fragmented and higher density environment in Fray Jorge,
particularly for males. The observed differences in micro-geographic
genetic structure for rayaditos might reflect the genetic consequences of
population-specific responses to contrasting environmental pressures near
the range limits of its distribution.
GS_LD_Aspinicauda
Navarino Island
Fray Jorge National Park
Northern Chile
Southern Chile