Long-distance dispersal of spruce budworm (Choristoneura fumiferana Clemens) in Minnesota (USA) and Ontario (Canada) via the atmospheric pathway

Sturtevant, Brian R.; Achtemeier, Gary L.; Charney, Joseph J.; Anderson, Dean P.; Cooke, Barry J.; Townsend, Philip A.

doi:10.1016/j.agrformet.2012.09.008

Cited by 49 publications

(64 citation statements)

References 57 publications

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“…to adapt and thrive in these local conditions. It is also possible that this region has arisen through linked selection via genetic drift or background selection, and the associated loci are not necessarily relevant to population divergence (Wolf & Ellegren, 2017 (2011) and Sturtevant et al (2013) in the Border Lakes region of Ontario and Minnesota, just east of the Manitoba-Ontario border. This region of the chromosome may be a genomic outlier region, also coined "island of genomic differentiation" or "speciation island," containing a barrier locus (or loci) that contributes to reproductive isolation (Trevoy et al, 2019;Turner, Hahn, & Nuzhdin, 2005;Wolf & Ellegren, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…This region of the chromosome may be a genomic outlier region, also coined "island of genomic differentiation" or "speciation island," containing a barrier locus (or loci) that contributes to reproductive isolation (Trevoy et al, 2019;Turner, Hahn, & Nuzhdin, 2005;Wolf & Ellegren, 2017). Additional simulations yielded a broader range of dispersal directions, yet still with no dispersal to the west (Sturtevant et al, 2013). Using modelling methods, they found adult dispersal patterns to be strongly directional from northwest to southeast throughout an entire dispersal season (Anderson & Sturtevant, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)

Lumley

Pouliot

Laroche

et al. 2020

Ecology and Evolution

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The spruce budworm, Choristoneura fumiferana, is presumed to be panmictic across vast regions of North America. We examined the extent of panmixia by genotyping 3,650 single nucleotide polymorphism (SNP) loci in 1975 individuals from 128 collections across the continent. We found three spatially structured subpopulations:Western (Alaska, Yukon), Central (southeastern Yukon to the Manitoba-Ontario border), and Eastern (Manitoba-Ontario border to the Atlantic). Additionally, the most diagnostic genetic differentiation between the Central and Eastern subpopulations was chromosomally restricted to a single block of SNPs that may constitute an island of differentiation within the species. Geographic differentiation in the spruce budworm parallels that of its principal larval host, white spruce (Picea glauca), providing evidence that spruce budworm and spruce trees survived in the Beringian refugium through the Last Glacial Maximum and that at least two isolated spruce budworm populations diverged with spruce/fir south of the ice sheets. Gene flow in the spruce budworm may also be affected by mountains in western North America, habitat isolation in West Virginia, regional adaptations, factors related to dispersal, and proximity of other species in the spruce budworm species complex. The central and eastern geographic regions contain individuals that assign to Eastern and Central subpopulations, respectively, indicating that these barriers are not complete.Our discovery of previously undetected geographic and genomic structure in the spruce budworm suggests that further population modelling of this ecologically important insect should consider regional differentiation, potentially co-adapted blocks of genes, and gene flow between subpopulations. K E Y W O R D SChoristoneura, comparative phylogeography, genotyping-by-sequencing, Picea glauca | 915 LUMLEY Et aL.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)

Lumley

Pouliot

Laroche

et al. 2020

Ecology and Evolution

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“…Long‐distance dispersal is episodic and depends on atmospheric processes (Sturtevant et al . ), local population density (Royama ), the condition of host trees (Régnière & Nealis ) and outbreak progression (Royama ).…”

Section: Introductionmentioning

confidence: 99%

Life‐stage differences in spatial genetic structure in an irruptive forest insect: implications for dispersal and spatial synchrony

et al. 2015

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Dispersal determines the flux of individuals, energy and information and is therefore a key determinant of ecological and evolutionary dynamics. Yet, it remains difficult to quantify its importance relative to other factors. This is particularly true in cyclic populations in which demography, drift and dispersal contribute to spatio-temporal variability in genetic structure. Improved understanding of how dispersal influences spatial genetic structure is needed to disentangle the multiple processes that give rise to spatial synchrony in irruptive species. In this study, we examined spatial genetic structure in an economically important irruptive forest insect, the spruce budworm (Choristoneura fumiferana) to better characterize how dispersal, demography and ecological context interact to influence spatial synchrony in a localized outbreak. We characterized spatial variation in microsatellite allele frequencies using 231 individuals and seven geographic locations. We show that (i) gene flow among populations is likely very high (Fst ≈ 0); (ii) despite an overall low level of genetic structure, important differences exist between adult (moth) and juvenile (larvae) life stages; and (iii) the localized outbreak is the likely source of moths captured elsewhere in our study area. This study demonstrates the potential of using molecular methods to distinguish residents from migrants and for understanding how dispersal contributes to spatial synchronization. In irruptive populations, the strength of genetic structure depends on the timing of data collection (e.g. trough vs. peak), location and dispersal. Taking into account this ecological context allows us to make more general characterizations of how dispersal can affect spatial synchrony in irruptive populations.

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“…Moths have limited, if any, choice as to where they land. So the extent to which large-scale patterns are the result of moth dispersal remains controversial in theory (Royama et al 2005) and problematic in practise (Sturtevant et al 2013) because the net effect of observed dispersal activity in a given location is not obvious. What is clear, however, is that the capacity and inclination for moths to migrate long distances is a phylogenetic trait common to all Choristoneura which adds significant potential for stochastic influence on local rates of change and results in a meta-population structure of sustained and synchronised outbreaks over a regional scale for all species ( Fig.…”

Section: Dispersal Of Moths and Recruitment Of Eggsmentioning

confidence: 99%

Comparative ecology of conifer-feeding spruce budworms (Lepidoptera: Tortricidae)

Nealis

2015

Can Entomol

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Abstract-The comparative ecology of conifer-feeding budworms in the genus Choristoneura Lederer (Lepidoptera: Tortricidae) in Canada is reviewed with emphasis on publications since 1980. Systematics and life history are updated and historical outbreak patterns and their current interpretation summarised. Recent evidence is analysed in the context of ecological interactions among three trophic levels; host plant, budworm herbivore, and natural enemies. The influence of weather and climate are viewed as modulating factors. The population behaviour of budworms is interpreted as the result of tri-trophic interactions that vary at different scales. The result of these multi-scale interactions is that despite shared phylogenetic constraints and common adaptations, different budworm species display different population behaviour because of specific ecological relationships with their respective hosts and natural enemies.

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Long-distance dispersal of spruce budworm (Choristoneura fumiferana Clemens) in Minnesota (USA) and Ontario (Canada) via the atmospheric pathway

Cited by 49 publications

References 57 publications

Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)

Continent‐wide population genomic structure and phylogeography of North America’s most destructive conifer defoliator, the spruce budworm (Choristoneura fumiferana)

Life‐stage differences in spatial genetic structure in an irruptive forest insect: implications for dispersal and spatial synchrony

Comparative ecology of conifer-feeding spruce budworms (Lepidoptera: Tortricidae)

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