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389 results for “Bark beetle”
FIGURE 10 in New species, new synonymy, taxonomic notes and new records of bark and ambrosia beetles from the southwestern United States and northern Mexico (Coleoptera: Curculionidae: Platypodinae and Scolytinae)
FIGURE 10. Distribution maps. Newly reported records are represented by stars, previously reported records by solid circles. (A) Hylastes mexicanus, (B) Hypothenemus woodi, (C) Ips pilifrons utahensis, (D) Loganius confinis, (E) Loganius fastigius, (F) Micracis ovata.
FIGURE 1 in Laemophloeus souzalimai, a new species of lined flat bark beetle (Coleoptera Cucujoidea, Laemophloeidae) from Southeast Brazil
FIGURE 1. Laemophloeus souzalimai sp. nov.: dorsal and ventral views of the (A–B) holotype male and the (B–C) paratype female. Scale: 0.5 mm.
FIGURE 2 in Laemophloeus souzalimai, a new species of lined flat bark beetle (Coleoptera Cucujoidea, Laemophloeidae) from Southeast Brazil
FIGURE 2. Laemophloeus souzalimai sp. nov.: head and pronotum, and antennomeres 4–6 of the (A–C) holotype male and the (D–F) paratype female. Genitalia of the paratype male: (G) claspers and aedeagus, (H) median lobe and tegmen, showing the X-shaped, basal sclerite of the internal sac, and (I) claspers. Scales: A, D = 0.3 mm; B, E = 200 µm; C, F = 50 µm. SEM images by Maria Oneide Silva de Moraes.
Data from: RNA-Seq reveals adaptive genetic potential of the rare Torrey pine (Pinus torreyana) in the face of Ips bark beetle outbreaks
<p>The ability of tree species to adapt to water stress and increased frequency of bark beetle outbreaks with climate change may increase with population size and standing genetic variation, calling into question the resilience of small, rare plant populations. The Torrey pine (<i>Pinus torreyana</i>) is a rare, genetically depauperate conifer that occurs naturally in a mainland and island population in southern California. Due to recent declines in the mainland population coinciding with drought and <i>Ips paraconfusus</i> bark beetle outbreaks, the species would benefit from an assessment of adaptive genetic diversity. Here, we use RNA-Seq to survey gene-coding diversity across 40 individuals to 1) characterize patterns of genetic diversity in the species and 2) test for genetic differentiation between trees that succumbed to beetle attack or survived following an outbreak. Consistent with previous studies, we found few genetic variants, with most SNPs occurring as fixed differences between populations. However, we found structure within the mainland and polymorphisms segregating in both populations. Interestingly, we found differentiation in genotypes between attacked and surviving trees and 11 SNPs associated with survival status, several of which had defense-related functions. While low diversity suggests limited adaptive capacity, genetic associations with survival in functionally relevant genes suggest adaptive potential for bark beetle defense. This initial study prompts future research to explore the genetic basis of putative resistance and suggests conservation efforts should protect surviving genotypes and the full spectrum of genetic diversity across populations to preserve the evolutionary potential of the species.</p>
FIGURES 11–19 in The strongly dimorphic bark beetle genus Pseudomicracis (Coleoptera, Scolytinae) in Madagascar-an integrated taxonomic revision
FIGURES 11–19. Dorsal, lateral and front view of Pseudomicracis madagascariensis male allotype (11, 14, 17) and female from Marojejy (12, 15, 18); Pseudomicracis difficilis female (13, 16, 19).
FIGURES 45–53 in The strongly dimorphic bark beetle genus Pseudomicracis (Coleoptera, Scolytinae) in Madagascar-an integrated taxonomic revision
FIGURES 45–53. Dorsal, lateral and front view of Pseudomicracis tomicoides female allotype (45, 48, 51); Pseudomicracis dispar female (46, 49, 52); Pseudomicracis pennata female allotype (47, 50, 53).
FIGURES 36–44 in The strongly dimorphic bark beetle genus Pseudomicracis (Coleoptera, Scolytinae) in Madagascar-an integrated taxonomic revision
FIGURES 36–44. Dorsal, lateral and front view of Pseudomicracis tomicoides male holotype (36, 39, 43); Pseudomicracis dispar male (37, 40, 43); Pseudomicracis pennata male holotype (38, 41, 44).
FIGURE 1 in The strongly dimorphic bark beetle genus Pseudomicracis (Coleoptera, Scolytinae) in Madagascar-an integrated taxonomic revision
FIGURE 1. Maximum likelihood tree topology based on nucleotides from five gene fragments. Bootstrap node support above nodes. Parsimony bootsrap support below (if different).
FIGURE 1 in Extant genus of flat bark beetle (Coleoptera: Silvanidae) with a present-day Australian-southern South American disjunction discovered in Eocene Rovno amber
FIGURE 1. Austronausibius aenigmatista sp. nov., holotype, 6816 [MAIG]: A—habitus, dorsal view; B—habitus, ventral view; C—details of left posterior pronotal and anterior elytral sides, black arrow indicates humeral denticle. Scale bars represent 1.0 mm (A, B) or 0.5 mm (C).
FIGURES 9‒12. Xylosandrus geduensis holotype, 2.1 in The bark and ambrosia beetles of Bhutan (Coleoptera: Curculionidae: Scolytinae and Platypodinae): a synopsis with three new species of Scolytinae
FIGURES 9‒12. Xylosandrus geduensis holotype, 2.1 mm. Dorsal, lateral, posterior oblique and anterior views.
FIGURES 5‒8. Euwallacea insolitus holotype, 2.9 in The bark and ambrosia beetles of Bhutan (Coleoptera: Curculionidae: Scolytinae and Platypodinae): a synopsis with three new species of Scolytinae
FIGURES 5‒8. Euwallacea insolitus holotype, 2.9 mm. Dorsal, lateral, posterior oblique and anterior views.
Figure 21. A–H in Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles
Figure 21. A–H, Eurytoma maura: A–G, female; H, male. A, head in frontal view; B, head in dorsal view; C, vertex; D, antenna; E, mesosoma in dorsal view; F, propodeum; G, gaster in lateral view; H, antenna.
Figure 4. A–O in Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles
Figure 4. A–O, Eurytoma laricis (D, F, H, I, J); Eurytoma morio (G, M, N); Eurytoma striolata (A, B, C, L, O). A, back of head; B, postgena; C, postoccipital region; D–E, clypeus; F–G, lower face; H, male scape; I, scape plate with pores (arrows); J, male antenna; K, mesoscutum; L, female propodeum; M, procoxa; N, metacoxa; O, female petiole. Abbreviations: ATP, anterior tentorial pits; GC, genal carina; LFP, lateral formaminal plate; PGG, postgenal groove, PGL, postgenal lamina; PTP, posterior tentorial pits.
Figure 23. A–D in Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles
Figure 23. A–D, male Eurytoma morio: A, head and mesosoma in lateral view; B, propodeum; C, antenna; D, scape.
Figure 11. A–H in Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles
Figure 11. A–H, female of Eurytoma aloifilippoi: A, head in frontal view; B, head in dorsal view; C, antenna; D, mesosoma in dorsal view; E, propodeum; F, base of forewing; G, apical venation; H, gaster in lateral view.
Data from: Rocky Mountain forests are poised to recover following bark beetle outbreaks, but with altered composition
<ol> <li>Amplified by warming temperatures and drought, recent outbreaks of native bark beetles (Curculionidae: Scolytinae) have caused extensive tree mortality throughout Europe and North America. Despite their ubiquitous nature and important effects on ecosystems, forest recovery following such disturbances is poorly understood, particularly across regions with varying abiotic conditions and outbreak effects.</li> <li>To better understand post-outbreak recovery across a topographically complex region, we synthesized data from 16 field studies spanning subalpine forests in the Southern Rocky Mountains, USA. From 1997 to 2019, these forests were heavily affected by outbreaks of three native bark beetle species (<em>Dendroctonus ponderosae</em>, <em>Dendroctonus rufipennis</em>, and <em>Dryocoetes confusus</em>). We compared pre- and post-outbreak forest conditions and developed region-wide predictive maps of post-outbreak (1) live basal areas, (2) juvenile densities, and (3) height growth rates for the most abundant tree species – aspen (<em>Populus</em> <em>tremuloides</em>), Engelmann spruce (<em>Picea</em> <em>engelmannii</em>), lodgepole pine (<em>Pinus</em> <em>contorta</em>), and subalpine fir (<em>Abies</em> <em>lasiocarpa</em>).</li> <li>Beetle-caused tree mortality reduced the average diameter of live trees by 28.4% (5.6 cm), and species dominance was altered on 27.8% of field plots with shifts away from pine and spruce. However, most plots (82.1%) are likely to recover towards pre-outbreak tree densities without any additional regeneration. Region-wide maps indicated that fir and aspen, non-host species for bark beetle species with the most severe effects (i.e., <em>Dendroctonus</em> spp.), will benefit from outbreaks through greater post-outbreak basal areas and higher juvenile densities. After accounting for individual size, height growth rates for all conifer species were more rapid in sites with low winter precipitation and high outbreak severity.</li> <li> <em>Synthesis</em>: In subalpine forests of the US Rocky Mountains, recent outbreaks of three bark beetle species have driven reductions in tree sizes and shifts in species composition. While eventual recovery of the pre-outbreak <em>forest structure</em> is likely in most places, shifts in <em>species composition</em> may persist for decades. Still, forest communities following bark beetle outbreaks are widely variable due to differences in pre-outbreak conditions, outbreak severity, and abiotic gradients. This regional variability has critical implications for ecosystem services and susceptibility to future disturbances.</li> </ol>
Number of gallery arms for oviposition by the tree-killing bark beetle Polygraphus proximus (Coleoptera: Curculionidae: Scolytinae)
<p><em>Polygraphus</em> <em>proximus</em> Blandford (Coleoptera: Curculionidae: Scolytinae) is a non-aggressive monogynous bark beetle. It has caused mass mortality in fir (<em>Abies</em> spp.) forests in the past decade. Although gallery structures made by polygynous beetles may influence their reproductive success, the gallery structure and the number of eggs laid by the monogynous tree-killing bark beetle <em>P</em>. <em>proximus</em> have not been investigated in detail in the natural setting of their native range. We, therefore, investigated the length of mother galleries of <em>P</em>. <em>proximus</em> and the number of eggs oviposited by the beetles in relation to gallery systems with different numbers of arms in Japan. The number of eggs oviposited in two-armed galleries was significantly greater than that observed in one-armed galleries. Additionally, the length of one- or two-armed galleries with no oviposition was significantly shorter than that in galleries consisting of more than two arms. Our results suggest that the optimal number of arms in a gallery system (in terms of the number of eggs oviposited) was two.</p>
Structural and functional dynamics of soil microbes following bark beetle infestation
<p>Provided are the bacterial and fungal phyloseq objects for Structural and functional dynamics of soil microbes following spruce beetle infestation". Authored by: Gordon Custer, Dr. Linda van Diepen, and Dr. William Stump. All of the University of Wyoming</p>
FIGURES 80–85. G in Re-descriptions of larvae of mature larvae of two predatory species of Nudobius and Gabrius associated with bark beetle galleries (Coleoptera: Staphylinidae)
FIGURES 80–85. G. splendidulus (80, 82, 84), N. lentus (81, 83, 85). 80, 81, apical portion of maxillary palp; 82, 83, apical portion of labial palp; 84, 85, apical portion of ligula.
FIGURES 1–12. G in Re-descriptions of larvae of mature larvae of two predatory species of Nudobius and Gabrius associated with bark beetle galleries (Coleoptera: Staphylinidae)
FIGURES 1–12. G. splendidulus (1–3, 7–10), N. lentus (4–6, 11, 12), mature larva. 1–6, habitus in dorsal (1, 4), lateral (2, 5) and ventral (3, 6) aspect; 7–12, seta on pronotum (7), abdominal tergite I (8), abdominal tergite VIII (9), mid femur (10) and abdominal tergite II (11, 12).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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OpenNeuro
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