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Abstract Detail

Molecular Ecology and Evolution

McGlaughlin, Mitchell E. [1], Helenurm, Kaius [2], Wallace, Lisa [3].

Conflicting Evolutionary Signal Among Genetic Markers in the Endemic Acmispon (Fabaceae) of the California Channel Islands.

Despite the widespread agreement that gene trees may not reflect true species trees, little attention has been paid to how genetic marker choice impacts the accuracy of inferred evolutionary groups. In this study we collected genetic data from two Acmispon (Fabaceae) species endemic to the California Channel Island, A. argophyllus and A. dendroideus, to examine how isolation among islands has impacted species divergence and the recognition of evolutionary groups.  Data was collected from 15 nuclear microsatellite loci, one low copy nuclear gene, and three chloroplast inter-genic spacers, sampling 10-30 individuals per population. Despite clear morphological differences, both nuclear and chloroplast DNA sequence datasets failed to resolve the two Acmispon species as distinct entities, implying significant amounts of incomplete lineage sorting. However, the nuclear microsatellite data clearly resolves A. dendroideus as a distinct unit, and A. argophyllus forming 3 geographically structured groups with unique origins. This research demonstrates how the characteristic of a genetic dataset (i.e. mutation rate) impacts the evolutionary groups resolved by summarizing relationships at different evolutionary time depths.

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1 - University Of Northern Colorado, 501 20th St, Box 92, Greeley, CO, 80639, USA
2 - University Of South Dakota, Department Of Biology, Vermillion, SD, 57069, USA
3 - Mississippi State University, PO Box GY, Mississippi State, MS, 39762, USA

Channel Islands
species tree
gene tree
plastid DNA
nuclear low or single copy genes

Presentation Type: Oral Paper:Papers for Topics
Session: 28
Location: Firs South/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 2:30 PM
Number: 28005
Abstract ID:571
Candidate for Awards:None

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