Data From: Broad- and fine-scale structure across the distribution of the Relict Dace (Relictus solitarius) in the Great Basin Desert, USA

The Relict Dace is a small cyprinid and the only species in its genus,
Relictus. It is naturally distributed in four drainage basins of central
Nevada - Butte Valley, Ruby Valley, Steptoe Valley and Goshute Valley. The
species has experienced periods of isolation and connection within these
four basins since the late Pliocene, with the last 100 years characterized
by anthropogenic disturbance. To better inform conservation actions, we
investigated range-wide and intra-basin genetic structure and diversity
and conducted Fst outlier tests using RAD-sequencing. We found high levels
of genetic structure and four main lineages on a broad scale corresponding
primarily to geography, and on a very fine scale (<1km) within
drainage basins. Signatures of selection in the form of outlier loci were
documented in multiple locations across the range.  Our results
provide baseline data for conservation efforts and highlight the degree of
fine-scale genetic structuring that may be present in fishes of the Great
Basin that are now restricted to small, isolated habitats, particularly
wetland complexes. We caution against assuming that geographic distance is
a proxy for genetic similarity in Great Basin fishes, encourage thorough
genetic sampling, and note that broad-scale genetic surveys can overlook
fine-scale genetic structure.