Ecological and genetic distinctiveness of socially hybridogenetic lineages of Pogonomyrmex harvester ants at regional and local scales

Cahan, Sara Helms; Goodman, Pace; Grauer, Jennifer A.

doi:10.1007/s10682-023-10241-9

Evol Ecol

2023

DOI: 10.1007/s10682-023-10241-9

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Ecological and genetic distinctiveness of socially hybridogenetic lineages of Pogonomyrmex harvester ants at regional and local scales

Sara Helms Cahan

Pace Goodman

Jennifer A. Grauer

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2024

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“…If speciation is advanced, hybridization across contact zones may be very limited or even non-existent (Wu et al, 2023). If divergence between overlapping populations is low, hybridization may involve multiple generations of hybrid offspring that can backcross to one or both parental populations, allowing genetic exchange (introgression) between divergent forms (Cahan et al, 2023).…”

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confidence: 99%

Reproductive isolation in a three‐way contact zone

Dean,

Whiting,

Jones

et al. 2024

Molecular Ecology

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Contact zones between divergent forms within a species provide insight into the role of gene flow in adaptation and speciation. Previous work has focused on contact zones involving only two divergent forms, but in nature, many more than two populations may overlap simultaneously and experience gene flow. Patterns of introgression in wild populations are, therefore, likely much more complicated than is often assumed. We begin to address this gap in current knowledge by investigating patterns of divergence and introgression across a complex natural contact zone. We use phenotypic and genomic data to confirm the existence of a three‐way contact zone among divergent freshwater resident, saltwater resident and saltwater migratory three‐spined stickleback (Gasterosteus aculeatus) on the island of North Uist, Scottish Western Isles. We find evidence for hybridization, mostly between saltwater resident and saltwater migratory forms. Despite hybridization, genomic analyses reveal pairwise islands of divergence between all forms that are maintained across the contact zone. Genomic cline analyses also provide evidence for selection and/or hybrid incompatibilities in divergent regions. Divergent genomic regions occur across multiple chromosomes and involve many known adaptive loci and several chromosomal inversions. We also identify distinct immune gene expression profiles between forms, but no evidence for transgressive expression in hybrids. Our results suggest that reproductive isolation is maintained in this three‐way contact zone, despite some hybridization, and that reduced recombination in chromosomal inversions may play an important role in maintaining this isolation.

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mentioning

confidence: 99%

Reproductive isolation in a three‐way contact zone

Dean,

Whiting,

Jones

et al. 2024

Molecular Ecology

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Ecological and genetic distinctiveness of socially hybridogenetic lineages of Pogonomyrmex harvester ants at regional and local scales

Cited by 1 publication

References 58 publications

Reproductive isolation in a three‐way contact zone

Reproductive isolation in a three‐way contact zone

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