10.5061/DRYAD.30QT0
Harrison, Xavier A.
University of Exeter
Young, Andrew J.
University of Exeter
York, Jennifer E.
University of Exeter
Data from: Population genetic structure and direct observations reveal
sex-reversed patterns of dispersal in a cooperative bird
Dryad
dataset
2014
cooperative breeding
population genetic structure
Plocepasser mahali
spatial autocorrelation analysis
2014-10-23T23:53:29Z
2014-10-23T23:53:29Z
en
https://doi.org/10.1111/mec.12978
266635 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Sex-biased dispersal is pervasive and has diverse evolutionary
implications, but the fundamental drivers of dispersal sex biases remain
unresolved. This is due in part to limited diversity within taxonomic
groups in the direction of dispersal sex biases, which leaves hypothesis
testing critically dependent upon identifying rare reversals of taxonomic
norms. Here we use a combination of observational and genetic data to
demonstrate a rare reversal of the avian sex-bias in dispersal in the
cooperatively breeding white-browed sparrow weaver (Plocepasser mahali).
Direct observations revealed that i) natal philopatry was rare, with both
sexes typically dispersing locally to breed, and ii), unusually for birds,
males bred at significantly greater distances from their natal group than
females. Population genetic analyses confirmed these patterns, as i)
corrected Assignment index (AIc), FST tests and isolation-by-distance
metrics were all indicative of longer dispersal distances among males than
females, and ii) spatial autocorrelation analysis indicated stronger
within-group genetic structure among females than males. Examining the
spatial scale of extra-group mating highlighted that the resulting ‘sperm
dispersal’ could have acted in concert with individual dispersal to
generate these genetic patterns, but gamete dispersal alone cannot account
entirely for the sex differences in genetic structure observed. That
leading hypotheses for the evolution of dispersal sex biases cannot
readily account for these sex-reversed patterns of dispersal in
white-browed sparrow-weavers, highlights the continued need for attention
to alternative explanations for this enigmatic phenomenon. We highlight
the potential importance of sex differences in the distances over which
dispersal opportunities can be detected.
33 Birds Final Dispersal TableRaw Data File of Dispersal Distances by
Sex185 Birds Genalex Analysis by SexMicrosatellite data from 185 birds,
split by sex and group, for Genalex analysisSeparate Sex Analysis Final
For Paper.xlsxSparrow Weaver Group CoordinatesGroup Coordinates for
Dispersal Bias Correction Simulationssparrow weaver group
coords.txtDistCalc FunctionR Function to calculate euclidean distance
between groupsSex-Biased Dispersal R CodeR Code for: 1) Sex-Biased
Dispersal Analysis, and 2) Simulations to Correct Observed Sex Bias for
DetectabilityMonitored Study Bounds DataCoordinates to Construct Polygon
delineating monitored spatial area for Dispersal Bias Correction
Simulations R Script
Kalahari Desert
South Africa