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Abstract Detail

Conservation Biology

Hasenstab-Lehman, Kristen [1], Guilliams, C. Matt [1].

Conservation Genomics of Dithyrea maritima (Brassicaceae), beach spectaclepod.

Dithyrea maritima (Davidson) Davidson; Brassicaceae), or beach spectaclepod, is a dune specialist endemic to coastal dunes from central California, United States, to northwestern Baja California, Mexico. Individuals of this perennial herb spread by rhizomes, forming a diffuse colony of ramets, each terminating in rosette of 1 to several fleshy leaves. Vegetative ramets appear in the mid-winter to mid-spring months. Flowering typically occurs from April to July, with the apex of the ramet elongating to form a dense raceme or cluster of fragrant flowers. Corollas are white, cream, or sometimes pink to purple tinged. As the common name alludes, the species produces a two-chambered fruit (silicle) that resembles spectacles; each round half of the fruit contains a single seed. It is listed on the California Native Plant Society Rare and Endangered Plant Inventory on list 1B.1 and was listed as Threatened under the California Endangered Species Act. Threats to extant occurrences include OHV activity, marine mammal activity, and non-native plants; it is also among the most threatened of coastal California plants with respect to climate change.Perhaps owing to these threats or some aspect of its life history, studied occurrences of the self-incompatible D. maritima have low seed set in general despite having seemingly adequate pollinator service in some (but not all) locations. Previous studies have shown that manual outcrosses boost seed production substantially, however, suggesting that knowledge of the distribution of genotypes on the landscape could be a critical first step toward any number of recovery actions. In this study, we sample from approximately 30 individuals from each of eleven sampling locations spanning the range of the taxon from Morro Bay, CA, USA to San Quintín, Baja CA, MX. We used double digestion RADseq to prepare libraries for high-throughput sequencing. We used the ipyrad to assemble a dataset with 5092 SNPs, and analyze population genomics of the species. Here we make a first report on our findings, placing the observed population genomic patterns into the context of regional biogeography. We conclude with recommendations for managing the species given the on-going threats of climate change and lack of seed set.

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1 - Santa Barbara Botanic Garden, Department of Conservation and Research, 1200 Mission Canyon Road, Santa Barbara, CA, 93105, USA


Presentation Type: Oral Paper
Session: CB1, Conservation Ecology 1
Location: Tucson B/Starr Pass
Date: Monday, July 29th, 2019
Time: 11:00 AM
Number: CB1012
Abstract ID:666
Candidate for Awards:None

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