A test of the sympatric host race formation hypothesis in
            <i>Neodiprion</i>
            (Hymenoptera: Diprionidae)

Linnen, Catherine R.; Farrell, Brian D.

doi:10.1098/rspb.2010.0577

Cited by 38 publications

(66 citation statements)

References 71 publications

(95 reference statements)

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“…Previous analyses at both the inter- and intraspecific levels indicate that changes in host use are associated with population differentiation and speciation in this genus [25, 35]. In this study, we investigated a potential causal relationship between adaptation to different hosts and reproductive isolation.…”

Section: Discussionmentioning

confidence: 97%

“…Because these species have been diverging for up to several million years [25, 80], they have had time to accumulate many differences and barriers to reproduction, which will make it difficult to determine which reproductive barriers arose first. To get at this question, we can examine other Neodiprion species and populations at different stages along the “speciation continuum” [81].…”

Section: Discussionmentioning

confidence: 99%

“…Several lines of evidence support the hypothesis that changes in host use are an important driver of ecological speciation in insects, including: (1) phylogenetic studies that show elevated rates of diversification among lineages of phytophagous insects compared to non-phytophagous insects [21–23], (2) comparative studies that demonstrate an association between changes in host use and speciation [11, 24, 25] (but see [26]), and (3) a growing list of empirical case studies that have confirmed key predictions of ecological speciation (reviewed in [8, 27–29]). However, while evidence supporting ecological speciation in insects is strong, the contribution of EPI remains unknown.…”

Section: Introductionmentioning

confidence: 99%

“…Population genomic data from a single species, N. lecontei , indicate that divergence in host use contributes to population differentiation [35], and comparative data from multiple species indicate that host-associated population differentiation occasionally progresses to speciation [25]. However, the mechanisms linking divergent host use to population differentiation and RI have not been identified.…”

Section: Introductionmentioning

confidence: 99%

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Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly species

2017

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BackgroundAlthough empirical data indicate that ecological speciation is prevalent in nature, the relative importance of different forms of reproductive isolation and the traits generating reproductive isolation remain unclear. To address these questions, we examined a pair of ecologically divergent pine-sawfly species: while Neodiprion pinetum specializes on a thin-needled pine (Pinus strobus), N. lecontei utilizes thicker-needled pines. We hypothesized that extrinsic postzygotic isolation is generated by oviposition traits. To test this hypothesis, we assayed ovipositor morphology, oviposition behavior, and host-dependent oviposition success in both species and in F1 and backcross females.ResultsCompared to N. lecontei, N. pinetum females preferred P. strobus more strongly, had smaller ovipositors, and laid fewer eggs per needle. Additionally, we observed host- and trait-dependent reductions in oviposition success in F1 and backcross females. Hybrid females that had pinetum-like host preference (P. strobus) and lecontei-like oviposition traits (morphology and egg pattern) fared especially poorly.ConclusionsTogether, these data indicate that maladaptive combinations of oviposition traits in hybrids contribute to extrinsic postzygotic isolation between N. lecontei and N. pinetum, suggesting that oviposition traits may be an important driver of divergence in phytophagous insects.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-017-0872-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly species

2017

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“…These analyses complement data indicating that purely sympatric speciation requires special conditions only occasionally met (Bolnick ; Wagner et al ; Martin and Wainwright ). For instance, most lake cichlids do not produce endemic radiations (Seehausen ); and even monophagous, host‐shifting insects, proposed as prime candidates for sympatric speciation by Mayr (, ), do not provide ready examples (Feder et al ; Linnen and Farrell ).…”

Section: Intrinsic Versus Extrinsic Postzygotic Isolation and Speciationmentioning

confidence: 99%

ON THE COYNE AND ORR-IGIN OF SPECIES: EFFECTS OF INTRINSIC POSTZYGOTIC ISOLATION, ECOLOGICAL DIFFERENTIATION, X CHROMOSOME SIZE, AND SYMPATRY ONDROSOPHILASPECIATION

2014

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Coyne and Orr found that mating discrimination (premating isolation) evolves much faster between sympatric than allopatric Drosophila species pairs. Their meta-analyses established that this pattern, expected under reinforcement, is common and that Haldane’s rule is ubiquitous in Drosophila species divergence. We examine three possible contributors to the reinforcement pattern: intrinsic postzygotic isolation, dichotomized as to whether hybrid males show complete inviability/sterility; host-plant divergence, as a surrogate for extrinsic postzygotic isolation; and X chromosome size, whether roughly 20% or 40% of the genome is X-linked. We focus on “young” species pairs with overlapping ranges, contrasted with allopatric pairs. Using alternative criteria for “sympatry” and tests that compare either level of prezygotic isolation in sympatry or frequency of sympatry, we find no statistically significant effects associated with X chromosome size or our coarse quantifications of intrinsic postzygotic isolation or ecological differentiation. Although sympatric speciation seems very rare in animals, the pervasiveness of the reinforcement pattern and the commonness of range overlap for close relatives indicate that speciation in Drosophila is often not purely allopatric. It remains to determine whether increased premating isolation with sympatry results from secondary contact versus parapatric speciation and what drives this pattern.

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Evolution of five environmentally responsive gene families in a pine‐feeding sawfly, Neodiprion lecontei (Hymenoptera: Diprionidae)

Vertacnik,

Herrig,

Godfrey

et al. 2023

Ecology and Evolution

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A central goal in evolutionary biology is to determine the predictability of adaptive genetic changes. Despite many documented cases of convergent evolution at individual loci, little is known about the repeatability of gene family expansions and contractions. To address this void, we examined gene family evolution in the redheaded pine sawfly Neodiprion lecontei, a noneusocial hymenopteran and exemplar of a pine‐specialized lineage evolved from angiosperm‐feeding ancestors. After assembling and annotating a draft genome, we manually annotated multiple gene families with chemosensory, detoxification, or immunity functions before characterizing their genomic distributions and molecular evolution. We find evidence of recent expansions of bitter gustatory receptor, clan 3 cytochrome P450, olfactory receptor, and antimicrobial peptide subfamilies, with strong evidence of positive selection among paralogs in a clade of gustatory receptors possibly involved in the detection of bitter compounds. In contrast, these gene families had little evidence of recent contraction via pseudogenization. Overall, our results are consistent with the hypothesis that in response to novel selection pressures, gene families that mediate ecological interactions may expand and contract predictably. Testing this hypothesis will require the comparative analysis of high‐quality annotation data from phylogenetically and ecologically diverse insect species and functionally diverse gene families. To this end, increasing sampling in under‐sampled hymenopteran lineages and environmentally responsive gene families and standardizing manual annotation methods should be prioritized.

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A test of the sympatric host race formation hypothesis in Neodiprion (Hymenoptera: Diprionidae)

Cited by 38 publications

References 71 publications

Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly species

Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly species

ON THE COYNE AND ORR-IGIN OF SPECIES: EFFECTS OF INTRINSIC POSTZYGOTIC ISOLATION, ECOLOGICAL DIFFERENTIATION, X CHROMOSOME SIZE, AND SYMPATRY ONDROSOPHILASPECIATION

Evolution of five environmentally responsive gene families in a pine‐feeding sawfly, Neodiprion lecontei (Hymenoptera: Diprionidae)

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