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14 results for “southern pine beetle”
Herb coverage on southern pine beetle and non-southern pine beetle impacted permanent plots in Coweeta white pine watershed 1 from 2001 to 2003
Percent cover of herb layer species was compared between beetle-impacted and non-beetle-impacted white pine plots in watershed 1.
Seedling regeneration density on southern pine beetle and non-southern pine beetle impacted permanent plots in Coweeta white pine watershed 1 from 2001 to 2003
Seedling density was compared between beetle-impacted and non-beetle-impacted white pine plots on watershed 1.
Photosynthetically active radiation (PAR) on southern pine beetle and non-southern pine beetle impacted permanent plots in Coweeta white pine watershed 1 from 2002 to 2003
Light availability (photosynthetically active radiation, PAR) was compared between beetle-impacted and non-beetle-impacted white pine plots watershed 1.
Percent soil moisture on southern pine beetle and non-southern pine beetle impacted permanent plots in Coweeta white pine watershed 1 from 2002 to 2003
Soil moisture was compared between beetle-impacted and non-beetle-impacted white pine plots in watershed 1.
Weak spatial-genetic structure in a native invasive, the southern pine beetle (Dendroctonus frontalis), across the eastern United States
<p>The southern pine beetle<i>, Dendroctonus frontalis</i>, 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 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 <i>D. frontalis</i> 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 <i>D. frontalis</i>, 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 dynamics in this species using alternate approaches.</p>
Influence of natal host on southern pine beetle host acceptance
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Weak spatial-genetic structure in a native invasive, the southern pine beetle (Dendroctonus frontalis), across the eastern United States
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FIGURE 4 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 4. Antenna of Tomicus species: (a, b) T. yunnanensis, (c) T. piniperda (Linnaeus), (d) T. destruens (Wollaston).
FIGURE 5 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 5. Protibiae of Tomicus species: T. destruens (Wollaston) (left), T. yunnanensis sp. n. (right).
FIGURE 1 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 1. Eytral declivity of Tomicus species: (a, b) T. puellus (Reitter), (c) T. minor (Hartig), (d) T. pilifer (Spessivtsew).
FIGURE 6 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 6. Pronotum of Tomicus species: (a) T. minor (Hartig), (b) T. pilifer (Spessivtsew) (note difference in density of punctures).
FIGURE 2 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 2. Eytral declivity of Tomicus species: (a) brevipilosus (Eggers), (b) T. piniperda (Linnaeus), (c) T. destruens (Wollaston), (d) T. yunnanensis sp. n. (holotype).
FIGURE 3 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 3. Antenna of Tomicus species: (a) T. brevipilosus (Eggers), (b) T. minor (Hartig), (c) T. puellus (Reitter), (d) T. pilifer (Spessivtsew).
FIGURE 7 in Description of the Yunnan shoot borer, Tomicus yunnanensis Kirkendall & Faccoli sp. n. (Curculionidae, Scolytinae), an unusually aggressive pine shoot beetle from southern China, with a key to the species of Tomicus
FIGURE 7. Tomicus yunnanensis sp. n., dorsal and lateral habitus of holotype.
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OpenNeuro
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