Comparing Ecoregional Classifications for Natural Areas Management in the Klamath Region, USA

Sarr, Daniel A.; Duff, Andrew A.; Dinger, Eric C.; Shafer, Sarah L.; Wing, Michael G.; Seavy, Nathaniel E.; Alexander, John D.

doi:10.3375/043.035.0301

Cited by 3 publications

(1 citation statement)

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“…We added a 47.7 km buffer to the five polygons defined in the shapefile to also include 95% of the 466 presence records in our dataset (3.2% of the total) that fell outside the original polygons. Ecoregions were adopted from the EPA Level III ecoregionalizations 32,56,57 with a modification by Sarr et al 58 (Fig. 1b).…”

Section: Subdivisionsmentioning

confidence: 99%

Alternatives to genetic affinity as a context for within-species response to climate

et al. 2019

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Background: Distributional responses by alpine taxa to repeated, glacial-interglacial cycles throughout the last two million years have signi cantly in uenced 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 ow 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 ner spatial scales in two geographically proximate mountain ranges of eastern Nevada. Results: Our genome-wide analyses corroborate range-wide, mitochondrial subspeci c designations and reveal pronounced ne-scale population structure between the Ruby Mountains and East Humboldt Range of eastern Nevada. Populations in Nevada were characterized by low genetic diversity (=0.0006-0.0009; W =0.0005-0.0007) relative to populations in California (=0.0014-0.0019; W =0.0011-0.0017) and the Rocky Mountains (=0.0025-0.0027; W =0.0021-0.0024), indicating substantial genetic drift in these isolated populations. Tajima's D was positive for all sites (D=0.240-0.811), consistent with recent contraction in population sizes range-wide. Conclusions: Substantial in uences 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.

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Section: Subdivisionsmentioning

confidence: 99%