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Abstract Detail

Population Genetics/Genomics

Galland, Lanie [1], Bisbing, Sarah [2], Parchman, Thomas [3].

The role of history and environment in shaping fragmented distributions of the emblematic serotinous pines of the coastal Pacific Slope.

Pinus attenuata (knobcone pine), P. muricata (Bishop pine), and P. radiata (Monterey pine) comprise a monophyletic group of serotinous pines with fragmented distributions along the west coast of North America. In contrast to the wide distributions characterizing most pine species, these occupy restricted ranges and strongly isolated populations, making them particularly susceptible to the negative effects of warming temperatures as small, rare populations could further constrict with insufficient range expansion. To characterize the historical context of divergence and the spatial genetic structure within each species, we sampled 543 individuals across 32 populations covering the natural distributions from northern California south through Baja, Mexico. Using high throughput sequencing of reduced representation libraries (ddRADseq), we generated genotypic data for ~15,000 genome-wide single nucleotide polymorphisms (SNPs). Despite often occurring in small isolated populations, nucleotide diversity values indicate moderate levels of genetic diversity within populations. Population genetic analyses reveal pronounced spatial genetic structure across the range of each species, with populations from different regions often characterized by marked genetic differentiation. Further, remarkable patterns of genetic differentiation are apparent among discrete stands of P. muricata on Santa Cruz Island, and similarly among discrete stands of P. radiata on Cedros Island. We are currently applying genetic environment association (GEA) analyses to evaluate the influence of specific environmental variables on shaping spatial genetic variation and driving local adaptation. This work should eventually result in a basic perspective on the association of environmental variation with local adaptation in rare, range-restricted conifers, and provide an applied perspective on genetic diversity and the potential of these populations to respond to environmental change.

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1 - University of Nevada, Reno, Biology, 1664 N. Virginia St. MS 0314, Reno, NV, 89557, United States
2 - University of Nevada, Reno, Natural Resources and Environmental Science, 1664 N. Virginia St. MS 0314, Reno, NV, 89557, United States
3 - University of Nevada, Reno, 1664 N. Virginia St. MS 0314, Reno, NV, 89557, United States

none specified

Presentation Type: Oral Paper
Session: PGG1, Population Genetics and Genomics I
Location: /
Date: Tuesday, July 20th, 2021
Time: 3:00 PM(EDT)
Number: PGG1001
Abstract ID:404
Candidate for Awards:None

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