Mapping seasonal migration in a songbird hybrid zone -- heritability, genetic correlations, and genomic patterns linked to speciation

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(18)

Published: April 22, 2024

Seasonal migration is a widespread behavior relevant for adaptation and speciation, yet knowledge of its genetic basis limited. We leveraged advances in tracking sequencing technologies to bridge this gap well-characterized hybrid zone between songbirds that differ migratory behavior. Migration requires the coordinated action many traits, including orientation, timing, wing morphology. used mapping show these traits are highly heritable genetically correlated, explaining how has evolved so rapidly past suggesting future responses climate change may be possible. Many mapped same genomic regions small structural variants indicating same, or tightly linked, genes underlie them. Analyses integrating transcriptomic data indicate cholinergic receptors could control multiple traits. Furthermore, analyses differentiation further suggested underlying help maintain reproductive isolation zone.

Language: Английский

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Thrushes in Love: Extensive Gene Flow, With Differential Resistance and Selection, Obscures and Reveals the Evolutionary History of a Songbird Clade

Molecular Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

ABSTRACT The application of high‐throughput sequencing to phylogenetic analyses is allowing authors reconstruct the true evolutionary history species. This work can illuminate specific mechanisms underlying divergence when combined with gene flow, recombination and selection. We conducted a phylogenomic analysis Catharus , songbird genus considerable potential for variation in migratory behaviour genomic resources. documented discordance among trees constructed mitochondrial, autosomal sex (Z) chromosome partitions. Two were recovered on Z. Both differed from autosomes, one matched mitochondria, other was unique Gene flow species likely generated much this discordance; substantial admixture between ustulatus remaining linked at least two historic events. tree Z reflects ; local same regions reduced recombination. Genes previously connected migration enriched these suggesting transitions non‐migratory states helped generate divergence. Migratory (vs. nonmigratory) formed monophyletic clade subset regions. elevated some adaptive introgression may have occurred, but dominant pattern balancing selection maintaining ancestral polymorphisms important olfaction perhaps, by extension, adaptation temperate climates. illuminates an model speciation demonstrates how differential resistance affect patterns.

Language: Английский

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Seasonally migratory songbirds have different historic population size characteristics than resident relatives

Published: Feb. 13, 2025

Modern genomic methods enable estimation of a lineage’s long-term effective population sizes back to its origins. This ability allows unprecedented opportunities determine how adoption major life-history trait affects lineages’ populations relative those without the trait. We used this novel approach study effects seasonal migration across evolutionary time. Seasonal is common strategy, but on lineages that don’t migrate are largely unknown. Using whole-genome data, we estimated over millions years in closely related seasonally migratory and resident group songbirds. Our main predictions were borne out: associated with larger ( N e ), greater variation , degree initial growth than among lineages. Initial periods remarkably long (0.63-4.29 Myr), paralleling expansion adaptation phases taxon cycles, framework lineage eventual contraction time encompassing biogeography ecology. Heterogeneity noteworthy, despite geographic proximity (including overlap) close relatedness. imbues these fundamentally different size attributes through compared

Language: Английский

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Origins of Nearctic migratory landbird vagrants recorded in Europe revealed by feather isotopic analysis

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: May 2, 2025

Understanding the occurrence of vagrant individuals away from their usual distribution range can shed light on animal navigation systems. In autumn, migratory Nearctic landbirds often occur as far Western Europe, and while link between these occurrences wind conditions over Atlantic Ocean is largely established, drivers natal origins transatlantic vagrants remain elusive. We conducted feather hydrogen isotopic (δ2Hf) analyses 72 representing 26 landbird species captured in Azores (Portugal), Iceland France last century to infer likely origins. While potential several came northeastern populations (e.g., Blackpoll Warbler, Northern Parula), we also found that some originated northwestern American Redstart, Gray-cheeked Thrush) or southern (Yellow-billed Cuckoo) populations. Our results confirm migrating along coast undertaking over-water flights are more be displaced. However, they show even southeast towards eastern North America have displaced across Ocean. Further research needed fully understand vagrancy events determine whether only factor push off intended course. Overall, this study sheds broad geographic transoceanic implications for colonization new regions.

Language: Английский

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The underlying causes of differential migration: assumptions, hypotheses, and predictions

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 10, 2024

Mechanisms governing the migratory decisions of birds have long fascinated ecologists and sparked considerable debate. Identifying factors responsible for variation in migration distance, also known as differential migration, has been a popular approach to understanding mechanisms underlying behaviour more generally. However, research progress slowed by continued testing overlapping, non-mechanistic, circular predictions among small set historically entrenched hypotheses. We highlight body size hypothesis suggest that commonly tested impeded because relationships with distance are made several distinct hypotheses contrasting mechanisms. The cost itself not adequately accounted most hypotheses, we propose two flight efficiency time- energy-minimizing allow individuals mitigate risks inherent longer migrations. advance conceptual versions social dominance based on related minimization food maximization will help clarify role competition driving decisions. Overall, describe refine 12 mechanistic proposed explain (along other special-case hypotheses), seven which limitation past identified this be an important driver migration. thoroughly reviewed 145 publications assess amount support 10 critical assumptions alternative birds. Our review reveals surprisingly few studies explicitly evaluate within context. Generating strong improve our ability differentiate these explanations Additionally, future intraspecific greatest if investigators continue focus rather than demographic classes, previous found differing classes. Interspecifically, thorough comparative analysis seeks species would broaden both regulating current patterns those led evolution Collectively, provide framework that, together advances animal-borne tracking technology, can used causes

Language: Английский

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Seasonally migratory songbirds have different historic population size characteristics than resident relatives

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: Aug. 5, 2023

Abstract Modern genomic methods enable estimation of a lineage’s long-term effective population sizes back to its origins. This ability allows unprecedented opportunities determine how adoption major life-history trait affects lineages’ populations relative those without the trait. We used this novel approach study effects seasonal migration across evolutionary time. Seasonal is common strategy, but on lineages that don’t migrate are largely unknown. Using whole-genome data, we estimated over millions years in closely related seasonally migratory and resident group songbirds. Our main predictions were borne out: associated with larger ( N e ), greater variation , degree initial growth than among lineages. Initial periods remarkably long (0.63-4.29 Myr), paralleling expansion adaptation phases taxon cycles, framework lineage eventual contraction time encompassing biogeography ecology. Heterogeneity noteworthy, despite geographic proximity (including overlap) close relatedness. imbues these fundamentally different size attributes through compared

Language: Английский

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