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Gerardo Zuniga - One of the best experts on this subject based on the ideXlab platform.
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revealing the gut bacteriome of Dendroctonus bark beetles curculionidae scolytinae diversity core members and co evolutionary patterns
Scientific Reports, 2017Co-Authors: Juan Alfredo Hernandezgarcia, Carlos Ivan Brionesroblero, Flor N Riveraorduna, Gerardo ZunigaAbstract:Dendroctonus bark beetles comprise 20 taxonomically recognized species, which are one of the most destructive pine forest pests in North and Central America, and Eurasia. The aims of this study were to characterize the gut bacterial diversity, to determine the core bacteriome and to explore the ecological association between these bacteria and bark beetles. A total of five bacterial phyla were identified in the gut of 13 Dendroctonus species; Proteobacteria was the most abundant, followed by Firmicutes, Fusobacteria, Actinobacteria and Deinococcus-Thermus. The α-diversity was low as demonstrated in previous studies and significant differences in β-diversity were observed. The core bacteriome was composed of Enterobacter, Pantoea, Pseudomonas, Rahnella, Raoultella, and Serratia. The tanglegram between bacteria and bark beetles suggests that members of bacterial community are acquired from the environment, possibly from the host tree. These findings improve the knowledge about the bacterial community composition, and provide the bases to study the metabolic functions of these bacteria, as well as their interaction with these bark beetles.
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The Current Status of the Distribution Range of the Western Pine Beetle, Dendroctonus brevicomis (Curculionidae: Solytinae) in Northern Mexico.
Journal of insect science (Online), 2017Co-Authors: O. Valerio-mendoza, Francisco Armendáriz-toledano, Gerardo Cuéllar-rodríguez, Jose F. Negron, Gerardo ZunigaAbstract:Abstract The distribution range of the western pine beetle Dendroctonus brevicomis LeConte (Coleoptera: Curculionidae) is supported only by scattered records in the northern parts of Mexico, suggesting that its populations may be marginal and rare in this region. In this study, we review the geographical distribution of D. brevicomis in northern Mexico and perform a geometric morphometric analysis of seminal rod shape to evaluate its reliability for identifying this species with respect to other members of the Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae) complex. Our results provide 30 new records, with 26 distributed in the Sierra Madre Occidental and 4 in the Sierra Madre Oriental. These records extend the known distribution range of D. brevicomis to Durango and Tamaulipas states in northern Mexico. Furthermore, we find high geographic variation in size and shape of the seminal rod, with conspicous differences among individuals from different geographical regions, namely west and east of the Great Basin and between mountain systems in Mexico. Key words: seminal rod shape, geometric morphometry, Dendroctonus frontalis complex
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illustrated key to species of genus Dendroctonus coleoptera curculionidae occurring in mexico and central america
Journal of Insect Science, 2017Co-Authors: Francisco Armendariztoledano, Gerardo ZunigaAbstract:We provide an illustrated key of species of Dendroctonus Erichson from Mexico and Central America based on characters of the male genitalia and external morphology. The key incorporates newly identified diagnostic characters for this genus that enhance discrimination of particularly difficult sibling species.
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phylogeny of Dendroctonus bark beetles coleoptera curculionidae scolytinae inferred from morphological and molecular data
Systematic Entomology, 2016Co-Authors: Javier Víctor, Gerardo ZunigaAbstract:Bark beetles in the genus Dendroctonus may attack and kill several species of coniferous trees, some of them causing major economic losses in temperate forests throughout North and Central America. For this reason, they have been widely studied. However, various aspects of the taxonomy and evolutionary history of the group remain contentious. The genus has been subdivided in species groups according to morphological, biological, karyological or molecular attributes, but the evolutionary affinities among species and species groups within the genus remain uncertain. In this study, phylogenetic relationships among Dendroctonus species were reassessed through parsimony-based cladistic analysis of morphological and DNA sequence data. Phylogenetic inference was based on 36 morphological characters and on mitochondrial DNA sequences of the cytochrome oxidase I (COI) gene. Analyses were carried out for each dataset, as well as for the combined data analysed simultaneously, under equal and implied weights. According to the combined analysis, the genus Dendroctonus is a monophyletic group defined by at least three synapomorphic characters and there are four main lineages of varied composition and diversity within the genus. Within these lineages, several monophyletic groups match, to some extent, species groups defined by previous authors, but certain groups proposed by those authors are polyphyletic or paraphyletic.
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a new species of bark beetle Dendroctonus mesoamericanus sp nov curculionidae scolytinae in southern mexico and central america
Annals of The Entomological Society of America, 2015Co-Authors: Francisco Armendariztoledano, Alicia Niño, Brian T Sullivan, Lawrence R. Kirkendall, Gerardo ZunigaAbstract:The bark beetle Dendroctonus mesoamericanus sp. nov. is described from a population in Parque Nacional Lagunas de Montebello, La Trinitaria, Chiapas, Mexico. This species belongs to the D. frontalis complex, which includes D. adjunctus Blandford 1897, D. approximatus Dietz 1890, D. bre- vicomis LeConte 1876, D. frontalis Zimmermann 1868, D. mexicanus Hopkins 1905, and D. vitei Wood 1975. The new species can be distinguished from closely related species D. frontalis, D. mexicanus, and D. vitei by four diagnostic morphological characters: the presence of striations on the preepisternal area of the prothorax (anterolateral pronotum) in both sexes, seminal rod with an approximately linear poste- rior margin of the dorsal process (in lateral view), irregularly sized ornamentations on the distal edge of squamiform plates present on the eighth abdominal tergite in females, and an inconspicuous pronotal callus in females. Furthermore, the karyotype of D. mesoamericanus sp. nov. (5AAþXyp / XX) differs from that of its sister speciesD. frontalis (7AA þ Xyp / XX).Dendroctonus mesoamericanus sp. nov. is dis- tributed in Belize, Guatemala, El Salvador, Honduras, Nicaragua, and in the Michoacan, Oaxaca, and Chiapas states in Mexico. In these countries, this species has been collected at elevations above from 311 to 2600 m on six pine species, and it commonly occurs in syntopy withD. frontalis.
Venkateswara B Rao - One of the best experts on this subject based on the ideXlab platform.
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a chiron approach to 1r 2r 5s 7s 2 hydroxy exo brevicomin a component of the volatiles produced by the male mountain pine beetle Dendroctonus ponderosae
Tetrahedron-asymmetry, 2005Co-Authors: Naveen D Kumar, Venkateswara B Rao, G S RamanjaneyuluAbstract:Abstract A chiron approach for the synthesis of (1 R ,2 R ,5 S ,7 S )-2-hydroxy- exo -brevicomin 1 , a component of the volatiles obtained from male mountain pine beetles, Dendroctonus ponderosae has been achieved. Our synthesis started with commercially available d -ribose and involves a Wittig olefination, an acid catalyzed one pot hydrogenation and the internal acetalization as key steps.
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a chiron approach to 1r 2r 5s 7r 2 hydroxy exo brevicomin a component of the volatiles produced by the male mountain pine beetle Dendroctonus ponderosae
Tetrahedron Letters, 2004Co-Authors: Naveen D Kumar, Venkateswara B RaoAbstract:Abstract A chiron approach to a synthesis of (1 R ,2 R ,5 S ,7 R )-2-hydroxy- exo -brevicomin 1 , a component of the volatiles obtained from male mountain pine beetles, Dendroctonus ponderosae has been achieved. Our synthesis started with commercially available d -mannitol and involved Wittig olefination, acid catalysed one-pot hydrogenation and internal acetalization as key steps.
Maria Li - One of the best experts on this subject based on the ideXlab platform.
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frontalin pheromone biosynthesis in the mountain pine beetle Dendroctonus ponderosae and the role of isoprenyl diphosphate synthases
Proceedings of the National Academy of Sciences of the United States of America, 2013Co-Authors: Christopher I Keeling, Maria Li, Christine C Chiu, Tidiane Aw, Hannah Henderson, Claus Tittiger, Hongbiao Weng, Gary J Blomquist, Joerg BohlmannAbstract:The mountain pine beetle (Dendroctonus ponderosae Hopkins) is the most destructive pest of western North American pine forests. Adult males produce frontalin, an eight-carbon antiaggregation pheromone, via the mevalonate pathway, as part of several pheromones that initiate and modulate the mass attack of host trees. Frontalin acts as a pheromone, attractant, or kairomone in most Dendroctonus species, other insects, and even elephants. 6-Methylhept-6-en-2-one, a frontalin precursor, is hypothesized to originate from 10-carbon geranyl diphosphate (GPP), 15-carbon farnesyl diphosphate (FPP), or 20-carbon geranylgeranyl diphosphate (GGPP) via a dioxygenase- or cytochrome P450-mediated carbon–carbon bond cleavage. To investigate the role of isoprenyl diphosphate synthases in pheromone biosynthesis, we characterized a bifunctional GPP/FPP synthase and a GGPP synthase in the mountain pine beetle. The ratio of GPP to FPP produced by the GPP/FPP synthase was highly dependent on the ratio of the substrates isopentenyl diphosphate and dimethylallyl diphosphate used in the assay. Transcript levels in various tissues and life stages suggested that GGPP rather than GPP or FPP is used as a precursor to frontalin. Reduction of transcript levels by RNA interference of the isoprenyl diphosphate synthases identified GGPP synthase as having the largest effect on frontalin production, suggesting that frontalin is derived from a 20-carbon isoprenoid precursor rather than from the 10- or 15-carbon precursors.
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draft genome of the mountain pine beetle Dendroctonus ponderosae hopkins a major forest pest
Genome Biology, 2013Co-Authors: Christopher I Keeling, Roderick T Docking, Macaire M S Yuen, Nancy Y Liao, Simon K Chan, Greg Taylor, Shaun D Jackman, Anh Nguyen, Donald L. Palmquist, Maria LiAbstract:Background The mountain pine beetle, Dendroctonus ponderosae Hopkins, is the most serious insect pest of western North American pine forests. A recent outbreak destroyed more than 15 million hectares of pine forests, with major environmental effects on forest health, and economic effects on the forest industry. The outbreak has in part been driven by climate change, and will contribute to increased carbon emissions through decaying forests.
Naveen D Kumar - One of the best experts on this subject based on the ideXlab platform.
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a chiron approach to 1r 2r 5s 7s 2 hydroxy exo brevicomin a component of the volatiles produced by the male mountain pine beetle Dendroctonus ponderosae
Tetrahedron-asymmetry, 2005Co-Authors: Naveen D Kumar, Venkateswara B Rao, G S RamanjaneyuluAbstract:Abstract A chiron approach for the synthesis of (1 R ,2 R ,5 S ,7 S )-2-hydroxy- exo -brevicomin 1 , a component of the volatiles obtained from male mountain pine beetles, Dendroctonus ponderosae has been achieved. Our synthesis started with commercially available d -ribose and involves a Wittig olefination, an acid catalyzed one pot hydrogenation and the internal acetalization as key steps.
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a chiron approach to 1r 2r 5s 7r 2 hydroxy exo brevicomin a component of the volatiles produced by the male mountain pine beetle Dendroctonus ponderosae
Tetrahedron Letters, 2004Co-Authors: Naveen D Kumar, Venkateswara B RaoAbstract:Abstract A chiron approach to a synthesis of (1 R ,2 R ,5 S ,7 R )-2-hydroxy- exo -brevicomin 1 , a component of the volatiles obtained from male mountain pine beetles, Dendroctonus ponderosae has been achieved. Our synthesis started with commercially available d -mannitol and involved Wittig olefination, acid catalysed one-pot hydrogenation and internal acetalization as key steps.
Christophe J Fettig - One of the best experts on this subject based on the ideXlab platform.
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efficacy of splat verb for protecting individual pinus contorta pinus ponderosa and pinus lambertiana from mortality attributed to Dendroctonus ponderosae
Journal of the Entomological Society of British Columbia, 2017Co-Authors: Christophe J Fettig, Steven A Munson, Brytten E Steed, Beverley M Bulaon, Leif A Mortenson, Robert A Progar, Clifford A Bradley, Agenor MafranetoAbstract:We evaluated the efficacy of a newly registered formulation of (-)-verbenone for protecting individual lodgepole pines, Pinus contorta Dougl. ex Loud., ponderosa pines, P . ponderosa Dougl. ex Laws., and sugar pines, P . lambertiana Dougl., from mortality attributed to mounatin pine beetle, Dendroctonus ponderosae Hopkins.
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© Birkhäuser Verlag, Basel, 2007 DOI 10.1007/s00049-007-0378-8
2014Co-Authors: William P. Shepherd, Steven J. Seybold, Dezene P. W. Huber, Christophe J FettigAbstract:Antennal responses of the western pine beetle, Dendroctonus brevicomis (Coleoptera: Curculionidae), to stem volatiles of its primary host, Pinus ponderosa, and nine sympatric nonhost angiosperms and conifer
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climate change and bark beetles of the western united states and canada direct and indirect effects
BioScience, 2010Co-Authors: Barbara J. Bentz, Christophe J Fettig, Matthew E Hansen, Jose F. Negron, Jacques Regniere, Jane L Hayes, Jeffrey A Hicke, Rick G Kelsey, Steven J. SeyboldAbstract:Climatic changes are predicted to significantly affect the frequency and severity of disturbances that shape forest ecosystems. We provide a synthesis of climate change effects on native bark beetles, important mortality agents of conifers in western North America. Because of differences in temperature-dependent life-history strategies, including cold-induced mortality and developmental timing, responses to warming will differ among and within bark beetle species. The success of bark beetle populations will also be influenced indirectly by the effects of climate on community associates and host-tree vigor, although little information is available to quantify these relationships. We used available population models and climate forecasts to explore the responses of two eruptive bark beetle species. Based on projected warming, increases in thermal regimes conducive to population success are predicted for Dendroctonus rufipennis (Kirby) and Dendroctonus ponderosae Hopkins, although there is considerable spatial and temporal variability. These predictions from population models suggest a movement of temperature suitability to higher latitudes and elevations and identify regions with a high potential for bark beetle outbreaks and associated tree mortality in the coming century.
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effectiveness of bifenthrin onyx and carbaryl sevin sl for protecting individual high value conifers from bark beetle attack coleoptera curculionidae scolytinae in the western united states
Journal of Economic Entomology, 2006Co-Authors: Christophe J Fettig, Kurt K Allen, Robert R Borys, John Christopherson, Christopher P Dabney, Thomas J Eager, Kenneth E Gibson, Elizabeth G Hebertson, Daniel F Long, Steven A MunsonAbstract:High-value trees, such as those located in residential, recreational, or administrative sites, are particularly susceptible to bark beetle (Coleoptera: Curculionidae: Scolytinae) attack as a result of increased amounts of stress associated with drought, soil compaction, mechanical injury, or vandalism. Tree losses in these unique environments generally have a substantial impact. The value of these individual trees, cost of removal, and loss of esthetics may justify protection until the main thrust of a bark beetle infestation subsides. This situation emphasizes the need for ensuring that effective insecticides are available for individual tree protection. In this study, we assess the efficacy of bifenthrin (Onyx) and carbaryl (Sevin SL) for protecting: ponderosa pine, Pinus ponderosa Dougl. ex. Laws., from western pine beetle, Dendroctonus brevicomis LeConte, in California; mountain pine beetle, Dendroctonus ponderosae Hopkins in South Dakota; and Ips spp. in Arizona; lodgepole pine, Pinus contorta Dougl. ex Loud., from D. ponderosae in Montana; pinyon, Pinus edulis Engelm. in Colorado and Pinus monophylla Torr. & Frem. in Nevada from pinyon ips, Ips confusus (LeConte); and Engelmann spruce, Picea engelmannii Parry ex. Engelm. from spruce beetle, Dendroctonus rufipennis (Kirby) in Utah. Few trees were attacked by Ips spp. in Arizona and that study was discontinued. Sevin SL (2.0%) was effective for protecting P. ponderosa, P. contorta, and P. monophylla for two field seasons. Estimates of efficacy could not be made during the second field season in P. edulis and P. engelmannii due to insufficient mortality in untreated, baited control trees. Two field seasons of efficacy was demonstrated in P. ponderosa/D. brevicomis and P. monophylla for 0.06% Onyx. We conclude that Onyx is an effective individual tree protection tool, but repeated annual applications may be required in some systems if multiyear control is desired.