Inferring Ancestry and Divergence Events in a Forest Pest Using Low-Density Single-Nucleotide Polymorphisms

Janes, Jasmine K.; Worth, James R. P.; Batista, Philip D.; Sperling, Felix A. H.

doi:10.1093/isd/ixy019

Cited by 8 publications

(4 citation statements)

References 77 publications

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“…mating systems (Janes et al 2016), trophic interactions (de Vere et al 2017), migration (Chapuis et al 2009)); demography (e.g. effective population sizes (Janes et al 2018)); and subsequent population-level changes (Gloss et al 2016). Where possible, better integration of genetic approaches with traditional surveys could greatly advance our knowledge of insect biodiversity and biology (e.g.…”

Section: Cost-efficient Genetic Toolsmentioning

confidence: 99%

Moving On from the Insect Apocalypse Narrative: Engaging with Evidence-Based Insect Conservation

2019

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Recent studies showing temporal changes in local and regional insect populations received exaggerated global media coverage. Confusing and inaccurate science communication on this important issue could have counterproductive effects on public support for insect conservation. The insect apocalypse narrative is fuelled by a limited number of studies that are restricted geographically (predominantly the United Kingdom, Europe, the United States) and taxonomically (predominantly some bees, macrolepidoptera, and ground beetles). Biases in sampling and analytical methods (e.g., categorical versus continuous time series, different diversity metrics) limit the relevance of these studies as evidence of generalized global insect decline. Rather, the value of this research lies in highlighting important areas for priority investment. We summarize research, communication, and policy priorities for evidence-based insect conservation, including key areas of knowledge to increase understanding of insect population dynamics. Importantly, we advocate for a balanced perspective in science communication to better serve both public and scientific interests.

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Section: Cost-efficient Genetic Toolsmentioning

confidence: 99%

Moving On from the Insect Apocalypse Narrative: Engaging with Evidence-Based Insect Conservation

2019

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“…, Elshire et al, 2011 ) could reveal subtle fine-scale spatial-genetic structure. For example, compared to inferences from microsatellites, SNPs have identified additional structure in the mountain pine beetle, D. ponderosae ( Batista et al, 2016 ; Janes et al, 2018 ). That said, although only 4 × to 12 × more bi-allelic SNPs than multi-allelic microsatellite loci might offer comparable resolution of population structure ( e.g.…”

Section: Discussionmentioning

confidence: 99%

Weak spatial-genetic structure in a native invasive, the southern pine beetle (Dendroctonus frontalis), across the eastern United States

Garrick

Arantes

Stubbs

et al. 2021

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The southern pine beetle, Dendroctonus frontalis, is a native pest of pine trees that has recently expanded its range into the northeastern United States. Understanding its colonization, dispersal, and connectivity will be critical for mitigating negative economic and ecological impacts in the newly invaded areas. Characterization of spatial-genetic structure can contribute to this; however, previous studies have reached different conclusions about regional population genetic structure, with one study reporting a weak east-west pattern, and the most recent reporting an absence of structure. Here we systematically assessed several explanations for the absence of spatial-genetic structure. To do this, we developed nine new microsatellite markers and combined them with an existing 24-locus data matrix for the same individuals. We then reanalyzed this full dataset alongside datasets in which certain loci were omitted with the goal of creating more favorable signal to noise ratios. We also partitioned the data based on the sex of D. frontalis individuals, and then employed a broad suite of genotypic clustering and isolation-by-distance (IBD) analyses. We found that neither inadequate information content in the molecular marker set, nor unfavorable signal-to-noise ratio, nor insensitivity of the analytical approaches could explain the absence of structure. Regardless of dataset composition, there was little evidence for clusters (i.e., distinct geo-genetic groups) or clines (i.e., gradients of increasing allele frequency differences over larger geographic distances), with one exception: significant IBD was repeatedly detected using an individual-based measure of relatedness whenever datasets included males (but not for female-only datasets). This is strongly indicative of broad-scale female-biased dispersal, which has not previously been reported for D. frontalis, in part owing to logistical limitations of direct approaches (e.g., capture-mark-recapture). Weak spatial-genetic structure suggests long-distance connectivity and that gene flow is high, but additional research is needed to understand range expansion and outbreak dynamics in this species using alternate approaches.

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“…For example, MPB patterns were consistent with isolation-by-distance at a continental scale, but more recent expansion signals and single-source populations could not be identified (Cullingham et al 2012a). More recent studies using genome-wide SNPs (Dowle et al 2017;Janes et al 2018) have found similar patterns, demonstrating that both single-and multimarker phylogeographic inferences have limitations in irruptive forest insect species. In contrast, phylogeographic methods proved particularly useful in identifying variation in fungal symbionts.…”

Section: Phylogeographymentioning

confidence: 93%

The contribution of genetics and genomics to understanding the ecology of the mountain pine beetle system

et al. 2019

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Environmental change is altering forest insect dynamics worldwide. As these systems change, they pose significant ecological, social, and economic risk through, for example, the loss of valuable habitat, green space, and timber. Our understanding of such systems is often limited by the complexity of multiple interacting taxa. As a consequence, studies assessing the ecology, physiology, and genomics of each key organism in such systems are increasingly important for developing appropriate management strategies. Here we summarize the genetic and genomic contributions made by the TRIA project — a long-term study of the mountain pine beetle (Dendroctonus ponderosae Hopkins) system encompassing beetle, fungi, and pine. Contributions include genetic and genomic resources for species identification, sex determination, detection of selection, functional genetic analysis, mating system confirmation, hybrid stability tests, and integrated genetic studies of multiple taxa. These resources and subsequent findings have accelerated our understanding of the mountain pine beetle system, facilitating improved management strategies (e.g., enhancements to stand susceptibility indices and predictive models) and highlighting mechanisms for promoting resilient forests. Further, work from the TRIA project serves as a model for the increasing number and severity of invasive and native forest insect outbreaks globally (e.g., Dutch elm disease and thousand cankers disease).

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Inferring Ancestry and Divergence Events in a Forest Pest Using Low-Density Single-Nucleotide Polymorphisms

Cited by 8 publications

References 77 publications

Moving On from the Insect Apocalypse Narrative: Engaging with Evidence-Based Insect Conservation

Moving On from the Insect Apocalypse Narrative: Engaging with Evidence-Based Insect Conservation

Weak spatial-genetic structure in a native invasive, the southern pine beetle (Dendroctonus frontalis), across the eastern United States

The contribution of genetics and genomics to understanding the ecology of the mountain pine beetle system

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