2021
DOI: 10.1002/ece3.7785
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Influence of the large‐Z effect during contact between butterfly sister species

Abstract: Recently diverged butterfly populations in North America have been found to exhibit high levels of divergence on the Z chromosome relative to autosomes, as measured by fixation index, Fst. The pattern of divergence appears to result from accumulation of incompatible alleles, obstructing introgression on the Z chromosome in hybrids (i.e., the large‐Z effect); however, it is unknown whether this mechanism is sufficient to explain the data. Here, we simulate the effects of hybrid incompatibility on interbreeding … Show more

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Cited by 3 publications
(2 citation statements)
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“…Since our models are not too different, larger values of N µ should lead to larger numbers of species in our model, while increasing d max should lead to fewer species. In this work, I have used a conservative value for F , however, a smaller value, such as F = 0.2, might also be considered reasonable [28], and would lead to a noticeable increase in ν t>N (but also to noisier trajectories for ν(t)). According to the data for butterflies, f is often larger than 0.01 for incipient species, which would lead to a lower estimate for µ via Eq.…”
Section: Discussionmentioning
confidence: 99%
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“…Since our models are not too different, larger values of N µ should lead to larger numbers of species in our model, while increasing d max should lead to fewer species. In this work, I have used a conservative value for F , however, a smaller value, such as F = 0.2, might also be considered reasonable [28], and would lead to a noticeable increase in ν t>N (but also to noisier trajectories for ν(t)). According to the data for butterflies, f is often larger than 0.01 for incipient species, which would lead to a lower estimate for µ via Eq.…”
Section: Discussionmentioning
confidence: 99%
“…to partition the sampled genomes by genetic distance. The clustering algorithm iteratively divides a sample into increasing numbers of clusters, and I select the partitioning with the largest number of clusters subject to the condition that the fixation index, F , a widely used measure of distance between genome clusters, satisfies F > F for all pairs of clusters in the partitioning, where F ∼ > 0.25, consistent with incipient species in natural populations[16,17,28] (later below, I demonstrate that this condition leads to very reasonable results for within species and between species genetic distances). The general behavior of the model as a function Fig.1of population density, population size, and time is qualitatively similar to the models studied by de Aguiar et al However, I find that persistent species occur only on narrow landscapes as realistic values of N and µ are approached.…”
mentioning
confidence: 99%