Genomic variation in the American pika: signatures of geographic isolation and implications for conservation
| Autor: | Kelly B. Klingler, Joshua P. Jahner, Thomas L. Parchman, Mary M. Peacock, Chris Ray |
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| Rok vydání: | 2021 |
| Předmět: |
Gene Flow
0106 biological sciences 0301 basic medicine Evolution Range (biology) Climate Population Conservation 010603 evolutionary biology 01 natural sciences Genetic diversity 03 medical and health sciences Genetic drift Genetic variation QH359-425 Animals Pika Sierra Nevada education QH540-549.5 education.field_of_study American pika Geography Ecology biology Genomics Lagomorpha Ochotona princeps General Medicine Alpine biology.organism_classification United States 030104 developmental biology Genetic structure Great basin Metapopulation Genotyping-by-sequencing Rocky Mountains Genome-Wide Association Study Research Article |
| Zdroj: | BMC Ecology and Evolution, Vol 21, Iss 1, Pp 1-19 (2021) BMC Ecology and Evolution |
| ISSN: | 2730-7182 |
| DOI: | 10.1186/s12862-020-01739-9 |
| Popis: | BackgroundDistributional responses by alpine taxa to repeated, glacial-interglacial cycles throughout the last two million years have significantly influenced the spatial genetic structure of populations. These effects have been exacerbated for the American pika (Ochotona princeps), a small alpine lagomorph constrained by thermal sensitivity and a limited dispersal capacity. As a species of conservation concern, long-term lack of gene flow has important consequences for landscape genetic structure and levels of diversity within populations. Here, we use reduced representation sequencing (ddRADseq) to provide a genome-wide perspective on patterns of genetic variation across pika populations representing distinct subspecies. To investigate how landscape and environmental features shape genetic variation, we collected genetic samples from distinct geographic regions as well as across finer spatial scales in two geographically proximate mountain ranges of eastern Nevada.ResultsOur genome-wide analyses corroborate range-wide, mitochondrial subspecific designations and reveal pronounced fine-scale population structure between the Ruby Mountains and East Humboldt Range of eastern Nevada. Populations in Nevada were characterized by low genetic diversity (π = 0.0006–0.0009; θW = 0.0005–0.0007) relative to populations in California (π = 0.0014–0.0019; θW = 0.0011–0.0017) and the Rocky Mountains (π = 0.0025–0.0027; θW = 0.0021–0.0024), indicating substantial genetic drift in these isolated populations. Tajima’sDwas positive for all sites (D = 0.240–0.811), consistent with recent contraction in population sizes range-wide.ConclusionsSubstantial influences of geography, elevation and climate variables on genetic differentiation were also detected and may interact with the regional effects of anthropogenic climate change to force the loss of unique genetic lineages through continued population extirpations in the Great Basin and Sierra Nevada. |
| Databáze: | OpenAIRE |
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