10.5061/DRYAD.45058JQ
Sobel, James M.
Binghamton University
Stankowski, Sean
University of Oregon
Streisfeld, Matthew A.
University of Oregon
Data from: Variation in ecophysiological traits might contribute to
ecogeographic isolation and divergence between parapatric ecotypes of
Mimulus aurantiacus
Dryad
dataset
2019
Ecogeographic isolation
anthocyanins
allocation strategies
incipient speciation
geranylflavonone
clinal variation
Mimulus aurantiacus
dehydration avoidance
National Science Foundation
https://ror.org/021nxhr62
DEB-1258199
2019-03-25T19:44:44Z
2019-03-25T19:44:44Z
en
https://doi.org/10.1111/jeb.13442
163220 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Many forms of reproductive isolation contribute to speciation, and early
acting barriers may be especially important, because they have the first
opportunity to limit gene flow. Ecogeographic isolation occurs when
intrinsic traits of taxa contribute to disjunct geographic distributions,
reducing the frequency of inter‐taxon mating. Characterizing this form of
isolation requires knowledge of both the geographic arrangement of
suitable habitats in nature and the identification of phenotypes involved
in shaping geographic distributions. In Mimulus aurantiacus, red‐ and
yellow‐flowered ecotypes are incompletely isolated by divergent selection
exerted by different pollinators. However, these emerging taxa are largely
isolated spatially, with a hybrid zone occurring along a narrow region of
contact. In order to assess whether responses to abiotic conditions
contribute to the parapatric distribution of ecotypes, we measured a
series of ecophysiological traits from populations along a transect,
including drought sensitivity, leaf area, and the concentrations of
vegetative flavonoids. In contrast to the abrupt transitions in floral
phenotypes, we found that ecophysiological traits exhibited a continuous
geographic transition that largely mirrors variation in climatological
variables. These traits may impede gene flow across a continuous
environmental gradient, but they would be unlikely to result in ecotypic
divergence alone. Nevertheless, we found a genetic correlation between
vegetative and floral traits, providing a potential link between the two
forms of isolation. Although neither barrier appears sufficient to cause
divergence on its own, the combined impacts of local adaptation to abiotic
conditions and regional adaptation to pollinators may interact to drive
discontinuous variation in the face of gene flow in this system.
drought_scores_rawThese are raw drought scores from the terminal drought
experiment described in M&M section 2.3.droughtdata_mainThis file
contains the drought sensitivity metric calculated from raw drought scores
as described in M&M section 2.3 (both untransformed and
transformed). It also contains leaf area measurements for each individual
(untransformed and transformed).leaf_traits_mainThis file contains leaf
ecophysiology traits, vegetative anthocyanin and resin in both stressed
and unstressed treatments. Untransformed data are included for all
variables, and transformed for those required. See M&M section
2.4.ecophys_traits_by_familyThis file contains summarized drought, leaf
area, vegetative anthocyanin and resin data, with individual replicates
averaged by family. See M&M section 2.5.pairwise_fstThis data file
contains a square matrix of Fst values between each population in the
ecophys experiments. See M&M section 2.5. These data were
originally estimated and presented in Stankowski et al 2015 (Evolution
69:3054-3068).population_climateThis data file contains population level
information about climatological variables collected from WORLDCLIM. See
M&M section 2.5.biomassThis data file contains above and
below-ground biomass data. See M&M section
2.6.myb2_antho_cosegregationThis data file contains myb2 genotypes, and
visible stem and leaf anthocyanins for a population of f2's from a
cross between red and yellow parents.
Southwestern United States
California
San Diego County