Data from: Landscape genetics identifies streams and drainage infrastructure as dispersal corridors for an endangered wetland bird
van Rees, Charles B., Tufts University
Reed, J. Michael, Tufts University
Wilson, Robert E., United States Fish and Wildlife Service
Underwood, Jared G., United States Fish and Wildlife Service
Sonsthagen, Sarah A., U. S. Geological SurveyAlaska Science Center Anchorage Alaska
Published Jun 28, 2019 on Dryad.
Cite this dataset
van Rees, Charles B. et al. (2019). Data from: Landscape genetics identifies streams and drainage infrastructure as dispersal corridors for an endangered wetland bird [Dataset]. Dryad. https://doi.org/10.5061/dryad.p90b87p
Anthropogenic alterations to landscape structure and composition can have significant impacts on biodiversity, potentially leading to species extinctions. Population-level impacts of landscape change are mediated by animal behaviors, in particular dispersal behavior. Little is known about the dispersal habits of rails (Rallidae) due to their cryptic behavior and tendency to occupy densely vegetated habitats. The effects of landscape structure on the movement behavior of waterbirds in general are poorly studied due to their reputation for having high dispersal abilities. We used a landscape genetic approach to test hypotheses of landscape effects on dispersal behavior of the Hawaiian gallinule (Gallinula galeata sandvicensis), an endangered subspecies endemic to the Hawaiian Islands. We created a suite of alternative resistance surfaces representing biologically plausible a-priori hypotheses of how gallinules might navigate the landscape matrix, and ranked these surfaces by their ability to explain observed patterns in genetic distance among 12 populations on the island of O`ahu. We modeled effective distance among wetland locations on all surfaces using both cumulative least-cost-path and resistance-distance approaches, and evaluated relative model performance using Mantel tests, a causal modeling approach, and the mixed-model maximum-likelihood population-effects framework. Across all genetic markers, simulation methods, and model comparison metrics, surfaces that treated linear water features like streams, ditches, and canals as corridors for gallinule movement outperformed all other models. This is the first landscape-genetics study on the movement behavior of any waterbird species to our knowledge. Our results indicate that lotic water features, including drainage infrastructure previously thought to be of minimal habitat value, contribute to habitat connectivity in this listed subspecies.
Genetic distance information between all pairs of sampled subpopulations of Hawaiian gallinules on Oahu
Resistance surface ASCII layers used to generate effective distances between populations of Hawaiian gallinules on Oahu
Resistance distances between all sampled Hawaiian gallinule populations on Oahu. Calculated using Circuitscape.
Least-cost-path effective distances between all sampled populations of Hawaiian gallinules on Oahu. Calculated using Gdistance package in R.