I first show how Rufous and Allen's hummingbird genomes vary clinally north-south up the Pacific coast, and how Rufous hummingbirds maintain this N/S cline as an E/W cline during migrationpic.twitter.com/ojMlIzs93R
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I first show how Rufous and Allen's hummingbird genomes vary clinally north-south up the Pacific coast, and how Rufous hummingbirds maintain this N/S cline as an E/W cline during migrationpic.twitter.com/ojMlIzs93R
Evidence of hybridization is consistent with this excellent paper which first described the hybrid zone in morphology and behaviorhttps://academic.oup.com/auk/article/136/4/ukz049/5565029 …
I then look at how divergence and diversity vary across the genome, finding consistent patterns of diversity across species. The Z chromosome is an Fst outlier but also has very low diversity, as expected with background selection in low-recombination regions.pic.twitter.com/VxbZjGzXUK
Correlation in the landscape of diversity declines as divergence age increases, suggesting linked selection and a conserved recombination landscape drive genome-wide patterns of diversity after speciation.pic.twitter.com/USwZcCGmM8
Intriguingly, the outlier character of Z chromosome divergence is seen between but not within species (ie not in sasin sasin v sasin sedentarius), which I argue points to more than just background selection acting here.
Read the paper for much more detail on what I think is going on and additional analyses of local tree support, Tajima's D, Z:autosome diversity ratios, and demographic effects.
Thank you to everyone at @UWBiology who helped me along the way and the many natural history museums whose diligence in collecting and curating specimens over many decades made this work possible. @burkemuseum @MSBbirds @alaskamuseum @LSU_MNS @MVZUCB
I'd also like to thank @NSF_BIO for funding this project, and hold a candle for the now defunct DDIG. I hope funders and societies can find a new way to give grad students the independent research support allowing this kind of work in the future.
For those without journal access, you can find the version of this study from my dissertation on my website http://cjbattey.com/papers/selasphorus_ms.pdf … It's almost identical in content but much less pretty and with a few typos.
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