Evidence for ecological speciation via a host shift in the holly leaf miner,<i>Phytomyza glabricola</i>(Diptera: Agromyzidae)

Hébert, Julie B.; Scheffer, Sonja J.; Hawthorne, David J.

doi:10.1002/ece3.2358

Cited by 8 publications

(4 citation statements)

References 84 publications

(130 reference statements)

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“…), and a recent genome scan suggests that several loci have experienced host‐associated selection (Hebert et al. ). Though a lack of genetic structure among mitochondrial sequences suggests that this shift has been relatively recent (Scheffer and Hawthorne ), attempts to produce hybrid offspring have failed (Hebert et al.…”

Section: Resultsmentioning

confidence: 99%

Revisiting the particular role of host shifts in initiating insect speciation

et al. 2017

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The notion that shifts to new hosts can initiate insect speciation is more than 150 years old, yet widespread conflation with paradigms of sympatric speciation has led to confusion about how much support exists for this hypothesis. Here, we review 85 insect systems and evaluate the relationship between host shifting, reproductive isolation, and speciation. We sort insects into five categories: (1) systems in which a host shift has initiated speciation; (2) systems in which a host shift has made a contribution to speciation; (3) systems in which a host shift has caused the evolution of new reproductive isolating barriers; (4) systems with host-associated genetic differences; and (5) systems with no evidence of host-associated genetic differences. We find host-associated genetic structure in 65 systems, 43 of which show that host shifts have resulted in the evolution of new reproductive barriers. Twenty-six of the latter also support a role for host shifts in speciation, including eight studies that definitively support the hypothesis that a host shift has initiated speciation. While this review is agnostic as to the fraction of all insect speciation events to which host shifts have contributed, it clarifies that host shifts absolutely can and do initiate speciation.

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Section: Resultsmentioning

confidence: 99%

Revisiting the particular role of host shifts in initiating insect speciation

et al. 2017

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“…An alternate, but not mutually exclusive explanation for divergence of Clade B comes from recent studies of coral associated marine taxa. Similar to phytophagus insects that undergo ecological divergence associated with host switching (Berlocher & Feder, 2002; Hébert, Scheffer & Hawthorne, 2016), recent studies from the marine realm demonstrate that changes in coral host taxa can promote lineage divergence, potentially leading to speciation (Simmonds et al, 2018). Samples were not collected in a way that allows us to test this hypothesis, but future studies separating samples by coral host to determine whether individuals from Clades A and B exist in mixed schools in sympatric populations, and if so, whether those schools are associated with different coral hosts.…”

Section: Discussionmentioning

confidence: 99%

Integrating phylogeographic and ecological niche approaches to delimitating cryptic lineages in the blue–green damselfish (Chromis viridis)

Liu

Tuanmu

Rachmawati

et al. 2019

PeerJ

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Species delimitation is challenging in sibling species/cryptic lineages because of the absence of clear diagnostic traits. However, integration of different approaches such as phylogeography and ecological niche comparison offers one potential approach to tease apart recently diverged lineages. In this study, we estimate the ecological niche divergence among lineages in Chromis viridis in a broad-scale phylogeographic framework to test whether the combination of these two approaches can effectively distinguish recently diverged lineages. Results from Cytb and Rag2 analyses identified two cryptic lineages (C. viridis A and C. viridis B) that diverged ∼3 Myr ago. Estimates of ecological niche divergence with 11 environmental parameters across the broad geographic range of these lineages showed overlapping ecological niches and niche conservatism. However, regardless of the incongruence between genetic and ecological niche divergence, the substantial genetic divergence between the two clades of C. viridis in both mtDNA and nuclear loci strong suggest that they are cryptic taxa.

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“…In herbivorous insects, which constitute a large portion of the biodiversity of the planet, speciation is usually associated with host shifts or changes in the width of the ecological niche, e.g., specialization (Hébert et al 2016; Forbes et al 2017). The complexity of this phenomenon, which should involve the simultaneous evolution of genes underlying multiple behavioral and physiological phenotypes with an ultimate impact on reproductive isolation, has long been a major area of research (Forbes et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Genomic islands of divergence betweenDrosophila yakubasubspecies predominantly overlap with chromosomal inversions

Ferreira

Moore

Ogereau

et al. 2022

Preprint

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During the early stages of speciation, genetic differences tend to accumulate at certain regions of the genome leading to the formation of genomic islands of divergence (GIDs). This pattern may be due to selection and/or difference in the rate of recombination. Here, we investigate the possible causes of GIDs in Drosophila yakuba mayottensis, a subspecies of Drosophila yakuba specializing on toxic noni (Morinda citrifolia) fruits on the island of Mayotte. Field collection reconfirmed the association of this subspecies with noni fruits. Population genomics did not find evidence for genetic structure on the island, but fine-scale analysis comparing these sequences to two mainland D. y. yakuba populations identified multiple structured genomic regions. We assembled a new genome for D. y. mayottensis using a combination of long and short reads. We identified six chromosomal inversions in high recombining regions, of which two were unique to D. y. mayottensis. Genome-wide differentiation analyses revealed that 92% of outlier genes overlapped with the inversions. We also compared population genomics sequences of Drosophila sechellia, the only other noni-specialist, to its generalist homosequential relatives of the simulans clade. Although we identified several common outlier genes between D. sechellia and D. y. mayottensis, we did not detect traces of GIDs in this clade. Thus, different genomic architectures can underlie complex convergence in response to common selection in independent lineages, leading to distinct genomic divergence patterns.

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Evidence for ecological speciation via a host shift in the holly leaf miner,Phytomyza glabricola(Diptera: Agromyzidae)

Cited by 8 publications

References 84 publications

Revisiting the particular role of host shifts in initiating insect speciation

Revisiting the particular role of host shifts in initiating insect speciation

Integrating phylogeographic and ecological niche approaches to delimitating cryptic lineages in the blue–green damselfish (Chromis viridis)

Genomic islands of divergence betweenDrosophila yakubasubspecies predominantly overlap with chromosomal inversions

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