Alternation of clear-cut colour patterns in<i>Corvus</i>crow evolution accords with learning-dependent social selection against unusual-looking conspecifics

Londei, Tiziano

doi:10.1111/ibi.12074

Cited by 10 publications

(17 citation statements)

References 15 publications

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“…1a). Color divergence is believed to contribute to prezygotic isolation by means of social and sexual selection promoting speciation 19 . The genetic basis of plumage variation and its contribution to population divergence has been investigated in much detail using single-nucleotide polymorphism (SNP) data in the Corvus (corone) spp.…”

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confidence: 99%

Discovery and population genomics of structural variation in a songbird genus

et al. 2020

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Structural variation (SV) constitutes an important type of genetic mutations providing the raw material for evolution. Here, we uncover the genome-wide spectrum of intra-and interspecific SV segregating in natural populations of seven songbird species in the genus Corvus. Combining short-read (N = 127) and long-read re-sequencing (N = 31), as well as optical mapping (N = 16), we apply both assembly-and read mapping approaches to detect SV and characterize a total of 220,452 insertions, deletions and inversions. We exploit sampling across wide phylogenetic timescales to validate SV genotypes and assess the contribution of SV to evolutionary processes in an avian model of incipient speciation. We reveal an evolutionary young (~530,000 years) cis-acting 2.25-kb LTR retrotransposon insertion reducing expression of the NDP gene with consequences for premating isolation. Our results attest to the wealth and evolutionary significance of SV segregating in natural populations and highlight the need for reliable SV genotyping.

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confidence: 99%

Discovery and population genomics of structural variation in a songbird genus

et al. 2020

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“…Here, we investigate the interplay between phenotypic divergence in mating traits, its genetic basis and mating preferences for the well-studied hybrid zone between all-black carrion and grey-coated hooded crows (Corvus (corone) corone and C. (c.) cornix) that presumably arose by secondary contact in the early Holocene approximately 12,000 years (or 2,000 crow generations) ago (Mayr, 1942;Meise, 1928;Parkin et al, 2003;Vijay et al, 2016;Kopp et al, 2018). In this system, there is only limited evidence for post-zygotic, natural selection against hybrids (Saino, 1990;Saino and Bolzern, 1992;Saino and Villa, 1992), but multiple support for plumage-based assortative mating (Meise, 1928;Randler, 2007a) and social marginalization of minority phenotypes (Saino and Scatizzi, 1991;Londei, 2013). The narrow morphological cline between the two taxa is thus believed to be mainly driven by prezygotic isolation mediated by assortative mating based on cues encoded in plumage pigmentation patterns (Brodin et al, 2013;Kryukov and Blinov, 1994;Meise, 1928;Vijay et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…An ecological contribution to the hybridzone dynamics exceeding local effects can almost certainly be excluded (Haas et al, 2010;Randler, 2007b;Rolando and Laiolo, 1994;Saino et al, 1998). The exact mechanism underlying assortative mate choice-imprinting or selfreferent phenotype matching-remains elusive for the crows system, yet both seem plausible (Brodin and Haas, 2006;Londei, 2013).…”

Section: Introductionmentioning

confidence: 99%

Assortative mate choice and epistatic mating-trait architecture induce complex movement of the crow hybrid zone

Metzler

Knief

Peñalba

et al. 2020

Preprint

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Hybrid zones provide a window into the evolutionary processes governing species divergence. While the role of postzygotic isolation has been extensively characterized, the contribution of prezygotic isolation is less well explored. In particular, the effect of mate choice mediated by preference learning such as self-recognition or imprinting remains largely elusive. Here, we present model-based simulations investigating the influence of the preference function, the genetic architecture of the mating trait and the role of sexual selection on spatio-temporal hybrid zone dynamics. The model is parameterized with empirical data from the hybrid zone between all-black carrion and grey-coated hooded crows allowing qualitative and quantitative inference in a natural setting. The best-fit model resulted in narrow clines for the mating trait loci coding for color polymorphism maintained by a moderate degree of assortative mating. Epistasis induced hybrid zone movement in favor of dark alleles followed by a shift in the opposite direction ∼1,200 generations after secondary contact. Unlinked neutral loci diffused near-unimpeded across the zone. This study demonstrates that assortative mating can explain steep transitions in mating trait loci without generalizing to genome-wide reproductive isolation. It further emphasizes the importance of mating trait architecture for spatiotemporal hybrid zone dynamics.

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“…1a). Popularized by Mayr in the mid 20th century23, it has become a textbook example for incipient speciation involving a sexually selected trait2425 that evolved independently in other species of the genus (see supplementary figure 1 in ref. 17).…”

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confidence: 99%

Evolution of heterogeneous genome differentiation across multiple contact zones in a crow species complex

et al. 2016

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Uncovering the genetic basis of species diversification is a central goal in evolutionary biology. Yet, the link between the accumulation of genomic changes during population divergence and the evolutionary forces promoting reproductive isolation is poorly understood. Here, we analysed 124 genomes of crow populations with various degrees of genome-wide differentiation, with parallelism of a sexually selected plumage phenotype, and ongoing hybridization. Overall, heterogeneity in genetic differentiation along the genome was best explained by linked selection exposed on a shared genome architecture. Superimposed on this common background, we identified genomic regions with signatures of selection specific to independent phenotypic contact zones. Candidate pigmentation genes with evidence for divergent selection were only partly shared, suggesting context-dependent selection on a multigenic trait architecture and parallelism by pathway rather than by repeated single-gene effects. This study provides insight into how various forms of selection shape genome-wide patterns of genomic differentiation as populations diverge.

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Alternation of clear-cut colour patterns inCorvuscrow evolution accords with learning-dependent social selection against unusual-looking conspecifics

Cited by 10 publications

References 15 publications

Discovery and population genomics of structural variation in a songbird genus

Discovery and population genomics of structural variation in a songbird genus

Assortative mate choice and epistatic mating-trait architecture induce complex movement of the crow hybrid zone

Evolution of heterogeneous genome differentiation across multiple contact zones in a crow species complex

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