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Abstract Detail

Hybrids and Hybridization

Ormond, Rhys A [1], Theiss, Kathryn E [1], Kephart, Susan R [1], Culley, Theresa [2].

Hybridization in Camassia: A Synthetic Approach Using Geometric Morphometrics, Microsatellites, and Morphology.

Hybridization in plants often results in novel phenotypes, particularly in terms of floral morphology, and closely related species can show distinct phenotypic differences.  Species in the genus Camassia (Agavoideae; Asparagaceae) often co-occur in wet meadows, providing an important resource for spring pollinators. Previously assumed to not hybridize with each other, the radially symmetrical C. leichtlinii ssp. suksdorfii and the bilaterally symmetric C. quamash ssp. maxima actually form evident hybrid zones that gradate from one species to the other at some locations. We used geometric morphometric analysis, a technique only relatively recently applied to botany, to quantify differences in shape and symmetry between sympatric and allopatric populations of these two camas species and their putative hybrids. Principal component analysis revealed distinct species separation between parental types in all populations, but also evidence of hybridity. Results from geometric morphometric analysis of over 200 floral images were combined with traditional morphology to assess hybridity, and compared against microsatellite data. We found that hybrid individuals were identifiable in the field based on both floral symmetry and other morphological characters. Putatively unhybridized parental individuals showed evidence of gene flow between species. We also observed several transgressive phenotypes among hybrid individuals. These data suggest that geometric morphometrics can effectively identify detect not only species boundaries, but also hybridization and its potential effect on evolutionary patterns.

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1 - WILLAMETTE UNIVERSITY, Department Of Biology, SALEM, OR, 97301, USA
2 - University Of Cincinnati, Department Of Biological Sciences, 614 Rieveschl Hall, Cincinnati, OH, 45221-0006, USA

geometric morphometrics
hybrid zone
species boundaries.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PHB004
Abstract ID:703
Candidate for Awards:None

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