Presentation Details
| Genomic underpinnings of behavioral courtship display elements in hybridizing Selasphorus hummingbirds Nadje A Najar1, Alan Brelsford2, Christopher Clark2, Brian Myers3, David Rankin2. 1Missouri State University, Springfield, Missouri, USA.2University of California, Riverside, Riverside, California, USA.3Eastern Oregon University, La Grande, Oregon, USA |
Abstract
We compared admixed and non-admixed individuals in a hybridizing hummingbird species with different courtship displays to identify genomic loci associated with these behaviors. Selasphorus courtship displays consist of stereotyped high-speed dives and shuttles and they regularly hybridize where their ranges meet in northern California and southern Oregon. Hybrids have highly variable displays compared with unadmixed individuals, with many hybrids expressing transgressive (exceeding the parental) phenotypes. We used whole genome sequencing and an admixture model that accounts for population structure to map each element of the display to the genome from 377 adult male Allen’s and Rufous Hummingbirds. All courtship display elements, behavioral and morphological, overwhelmingly map to a small 6 Mb region of the Z chromosome. The species-level differences in behavior and morphology correspond to a peak association region spanning only four genes. Despite relative homogenization of the autosome, recombination in this region is not homogeneous, suggesting selection prevents the movement of Z but not autosomal alleles away from the hybrid zone.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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