Domestication is associated with increased interspecific hybrid compatibility in landfowl (order: Galliformes)
Summary
Ingested 2026-04-21. 3 findings extracted and verified.
Findings worth citing
Finding 1 — In Galliformes, domestication is significantly associated with reduced reproductive isolation after phylogenetic correction, though the effect is small relative to divergence time.
we found a significant relationship between domestication and reproductive compatibility after correcting for phylogeny, removing extreme values, and addressing potential biases (F 1,7 4 = 5.43, R 2 = 0.06, P-value = 0.02) — p. 1
Why this is citable: This is the paper’s central novel claim — that domestication increases interspecific hybrid compatibility — and would be cited by work on domestication syndrome, speciation reversal, or hybridization in managed species.
Counter / limitation: The R² is only 0.06, the analysis is correlational (cannot distinguish whether reproductively labile species are preferentially domesticated), and the domestication index relies on text-mining of a single aviculture magazine as a proxy.
Topics: domestication_genomics, sex_chromosome_evolution
Finding 2 — In Galliformes, domestication is significantly associated with reduced reproductive isolation after phylogenetic correction, though the effect is small relative to divergence time.
we found a significant relationship between domestication and reproductive compatibility after correcting for phylogeny, removing extreme values, and addressing potential biases (F 1,7 4 = 5.43, R 2 = 0.06, P-value = 0.02) — p. 1
Why this is citable: This is the paper’s central novel claim — that domestication increases interspecific hybrid compatibility — and would be cited by work on domestication syndrome, speciation reversal, or hybridization in managed species.
Counter / limitation: The R² is only 0.06, the analysis is correlational (cannot distinguish whether reproductively labile species are preferentially domesticated), and the domestication index relies on text-mining of a single aviculture magazine as a proxy.
Topics: domestication, reproductive_isolation, avian_hybridization, Galliformes
Finding 3 — Among birds, the inter-family hybrids between helmeted guineafowl and Phasianidae species at ~51 MY divergence represent the most diverged known avian hybrids, all producing sterile offspring.
The five inter-family hybridizations all involved the helmeted guineafowl (N. meleagris) hybridizing with species from Phasianidae; these pairs had the maximum divergence time, 51 MY, and had sterile offspring. — p. 3
Why this is citable: Establishes the empirical upper bound of avian hybridization distance within the Galliformes dataset (51 MY, inter-family crosses involving helmeted guineafowl × Phasianidae), useful as a data point for comparative studies on the accumulation of postzygotic isolation in birds. Note that the Introduction mentions a range of 51–65 MY for this cross, attributing the upper figure to Alfieri et al. 2023, while the Results section reports 51 MY from TimeTree.
Counter / limitation: The paper itself cites Alfieri et al. 2023 as having genomically refuted at least one guineafowl × Phasianidae hybrid record; the remaining five inter-family records in this dataset lack molecular verification, so the 51 MY figure rests on literature-sourced hybrid reports that have not been independently confirmed at the genomic level.
Topics: reproductive_isolation, avian_hybridization, Galliformes, postzygotic_isolation