Mechanistic insights into landscape genetic structure of two tropical amphibians using field-derived resistance surfaces

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dc.contributor.authorNowakowski, A. Justin
dc.contributor.authorDeWoody, J. Andrew
dc.contributor.authorFagan, Matthew E.
dc.contributor.authorWilloughby, Janna R.
dc.contributor.authorDonnelly, Maureen A.
dc.date.accessioned2021-05-21T20:11:26Z
dc.date.available2021-05-21T20:11:26Z
dc.date.issued2014-12-23
dc.description.abstractConversion of forests to agriculture often fragments distributions of forest species and can disrupt gene flow. We examined effects of prevalent land uses on genetic connectivity of two amphibian species in northeastern Costa Rica. We incorporated data from field surveys and experiments to develop resistance surfaces that represent local mechanisms hypothesized to modify dispersal success of amphibians, such as habitat-specific predation and desiccation risk. Because time lags can exist between forest conversion and genetic responses, we evaluated landscape effects using land-cover data from different time periods. Populations of both species were structured at similar spatial scales but exhibited differing responses to landscape features. Litter frog population differentiation was significantly related to landscape resistances estimated from abundance and experiment data. Model support was highest for experiment-derived surfaces that represented responses to microclimate variation. Litter frog genetic variation was best explained by contemporary landscape configuration, indicating rapid population response to land-use change. Poison frog genetic structure was strongly associated with geographic isolation, which explained up to 45% of genetic variation, and long-standing barriers, such as rivers and mountains. However, there was also partial support for abundance- and microclimate response-derived resistances. Differences in species responses to landscape features may be explained by overriding effects of population size on patterns of differentiation for poison frogs, but not litter frogs. In addition, pastures are likely semi-permeable to poison frog gene flow because the species is known to use pastures when remnant vegetation is present, but litter frogs do not. Ongoing reforestation efforts will probably increase connectivity in the region by increasing tree cover and reducing area of pastures.en_US
dc.description.sponsorshipWe thank M. Veiman for help in the field and laboratory andmembers of the DeWoody laboratory for valuable feedbackand assistance. We are grateful to S. Spear, A. Storfer and J.Watling for comments that improved the analyses and qualityof the manuscript, to the Costa Rican government (MINAE-SINAC) for permits and to The Organization for TropicalStudies for logistical support. AJN was supported by FloridaInternational University Dissertation Evidence Acquisition andDissertation Year Fellowships, as well as by grants from OTS, Tinker Foundation, ASIH, NCHS, and Idea Wild. All experi-mental protocols received IACUC approval (#s 09-007, 10-023,& 12-003). This is contribution number 295 to the programmein Tropical Biology at Florida International University.en_US
dc.description.urihttps://onlinelibrary.wiley.com/doi/abs/10.1111/mec.13052en_US
dc.format.extent2 filesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2vyb3-mx75
dc.identifier.citationNowakowski, A. Justin; DeWoody, J. Andrew; Fagan, Matthew E.; Willoughby, Janna R.; Donnelly, Maureen A.; Mechanistic insights into landscape genetic structure of two tropical amphibians using field-derived resistance surfaces; Molecular Ecology 24,3 (2015); https://onlinelibrary.wiley.com/doi/abs/10.1111/mec.13052en_US
dc.identifier.urihttps://doi.org/10.1111/mec.13052
dc.identifier.urihttp://hdl.handle.net/11603/21601
dc.language.isoen_USen_US
dc.publisherWiley Online Libraryen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Geography and Environmental Systems Department Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleMechanistic insights into landscape genetic structure of two tropical amphibians using field-derived resistance surfacesen_US
dc.typeTexten_US

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