10.5061/DRYAD.82BR3
Watanabe, Kozo
Leibniz Institute of Freshwater Ecology and Inland Fisheries
Ehime University
Kazama, So
Tohoku University
Omura, Tatsuo
Tohoku University
Monaghan, Michael T.
Leibniz Institute of Freshwater Ecology and Inland Fisheries
Data from: Adaptive genetic divergence along narrow environmental
gradients in four stream insects
Dryad
dataset
2014
outlier loci
amplified fragment length polymorphism (AFLP)
Hydropsyche orientalis
stream invertebrate
2006
Stenopsyche marmorata
encironment
Hydropsyche albicephela
Ephemera japonica
2014-06-12T17:17:44Z
2014-06-12T17:17:44Z
en
https://doi.org/10.1371/journal.pone.0093055
1150505 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
A central question linking ecology with evolutionary biology is how
environmental heterogeneity can drive adaptive genetic divergence among
populations. We examined adaptive divergence of four stream insects from
six adjacent catchments in Japan by combining field measures of habitat
and resource components with genome scans of non-neutral Amplified
Fragment Length Polymorphism (AFLP) loci. Neutral genetic variation was
used to measure gene flow and non-neutral genetic variation was used to
test for adaptive divergence. We identified the environmental
characteristics contributing to divergence by comparing genetic distances
at non-neutral loci between sites with Euclidean distances for each of 15
environmental variables. Comparisons were made using partial Mantel tests
to control for geographic distance. In all four species, we found strong
evidence for non-neutral divergence along environmental gradients at
between 6 and 21 loci per species. The relative contribution of these
environmental variables to each species' ecological niche was
quantified as the specialization index, S, based on ecological data. In
each species, the variable most significantly correlated with genetic
distance at non-neutral loci was the same variable along which each
species was most narrowly distributed (i.e., highest S). These were
gradients of elevation (two species), chlorophyll-a, and ammonia-nitrogen.
This adaptive divergence occurred in the face of ongoing gene flow (Fst =
0.01–0.04), indicating that selection was strong enough to overcome
homogenization at the landscape scale. Our results suggest that adaptive
divergence is pronounced, occurs along different environmental gradients
for different species, and may consistently occur along the narrowest
components of species' niche.
AFLP data of 4 stream insects and environment data in
JapanAFLP_binary_Environment_data_Watanabe et at.2014.xlsx
Japan