10.5061/DRYAD.JDFN2Z379
Hedh, Linus
0000-0003-0483-3512
Lund University
Hedenström, Anders
0000-0002-1757-0945
Lund University
The migration pattern of a monogamous shorebird challenges existing
hypotheses explaining the evolution of differential migration
Dryad
dataset
2019
differential migration
Charadrius hiaticula
Sweden
Swedish Research Council
https://ror.org/03zttf063
621-2012-3585
Swedish Research Council
https://ror.org/03zttf063
2016-03625
Swedish Research Council
https://ror.org/03zttf063
349-2007-8690
BirdLife Sverige
No number
2019-12-11T00:00:00Z
2019-12-11T00:00:00Z
en
11306 bytes
6
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Differential migration by sex, where one sex migrates further than the
other, occurs in many bird species. How this pattern evolves is however
little understood. The first aim of this study was to investigate the
extent of differential migration in the common ringed plover Charadrius
hiaticula, breeding in southeast Sweden, and test three main hypotheses
(the social dominance, body size and arrival time hypothesis) regarding
the evolution of differential migration. Geolocators were used to derive
spatiotemporal data and morphometrics were collected from the studied
population. Males migrated 800 km farther compared to females, were
marginally larger and there was no statistical difference in spring
arrival between the sexes. In contrast to other studies none of the
previously proposed hypotheses could account for the observed pattern. An
additional finding was that both sexes arrive up to 1.5 months before egg
laying, but males initiate territorial behaviour upon arrival. Based on
these observations we suggest that males have a higher energetic demand,
and challenges to meet those, early in the breeding season. Therefore we
hypothesise that males arrive to the breeding site with residual fuel
reserves accumulated at the wintering site to cover at least parts of
these demands .Based on this hypothesis we present a simple model to
explain the longer migration by males. The model is contingent on a
trade-off between site specific fuelling rates (which we assume to
increase with decreasing latitude), cost of the extra migration distance
and predation risk during fuelling. This framework may be applicable to
other cases of differential migration, especially in temperate breeding
species which exhibit long pre-egg laying periods.
This data was used to compare migratory behaviour between males and
females common ringed plover Charadrisu hiaticula breeding in Ottenby,
southeast Sweden, and to test hypotheses regarding evolution of
differential migration. Data on migratory behavior was collected with
light level geolocators. Parameters such as departure and arrival days,
and migration distance were derived using R programme GeoLight (version
2.0.1). Data on morphology (wing length, total head length [bill + head]
and tarsus length) was collected within the studied population. The data
were further analyzed for sex differences in R (version 3.3.2.)
S2.crp.diff.migration.csv - contains data on migratory behaviour and
individual meta data. S3.crp.diff.migration.csv - contains data on
morphology measured for the whole population.
S4.crp.diff.migration.Rcode.txt - contains the R code for descriptive
statistics and tests. README.S2_S3.crp.migration.txt - contains column
annotations for S2 and S3.