R. A. Beaver

ORCID: 0000-0003-1932-3208
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About
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Research Areas
  • Forest Insect Ecology and Management
  • Insect and Pesticide Research
  • Insect and Arachnid Ecology and Behavior
  • Forest Ecology and Biodiversity Studies
  • Coleoptera Taxonomy and Distribution
  • Coleoptera: Cerambycidae studies
  • Insect-Plant Interactions and Control
  • Plant and animal studies
  • Entomopathogenic Microorganisms in Pest Control
  • Insect Pest Control Strategies
  • Animal Ecology and Behavior Studies
  • Ecology and Vegetation Dynamics Studies
  • Insect behavior and control techniques
  • Fossil Insects in Amber
  • Insect Resistance and Genetics
  • Scarabaeidae Beetle Taxonomy and Biogeography
  • Plant Parasitism and Resistance
  • Hymenoptera taxonomy and phylogeny
  • Insect Utilization and Effects
  • Plant Pathogens and Fungal Diseases
  • Forensic Entomology and Diptera Studies
  • Biological Control of Invasive Species
  • Plant and Biological Electrophysiology Studies
  • Study of Mite Species
  • Date Palm Research Studies

Shoklo Malaria Research Unit
2015-2025

Chiang Mai University
1972-2024

Colegio de Postgraduados
2015

University of the South Pacific
1985-2008

Finnish Environment Institute
1991

University of Zambia
1978-1980

Universiti Sains Malaysia
1975-1976

University College of the North
1969-1973

Bangor University
1969-1973

As part of an ongoing revision the Southeast Asian fauna two distinct species groups were identified and hypothesized as new genera. These monophyletic evidenced by a Bayesian analysis DNA sequences from four genes for 181 xyleborine taxa augmented 18 newly included in this phylogenetic analysis. The discovered demonstrated unique combinations diagnostic characters levels sequence difference commensurable to other taxa. Hence, genera three described: Fraudatrix gen. n., Tricosa cattienensis...

10.11646/zootaxa.4722.6.2 article EN Zootaxa 2020-01-17

Xyleborini currently consists of more than 1168 species in 36 genera, nearly all which were described Xyleborus (Hulcr et al. 2015; Smith 2017). The tribe has been the focus considerable taxonomic attention over last decade resulting phylogenetically based revisions and erection new genera (e.g. Hulcr 2007, Cognato 2010). However Old World these efforts have largely restricted to faunas particular countries such as Taiwan (Beaver Liu 2010), Thailand 2014), Papua New Guinea 2008). region's...

10.11646/zootaxa.4394.1.9 article EN Zootaxa 2018-03-12

Ambrosia beetles of the Euwallacea fornicatus (Eichhoff, 1868) species complex are emerging tree pests, responsible for significant damage to orchards and ecosystems around world. The comprises seven described species, all which nearly identical. Given that morphology-defined boundaries have been ambiguous, historically, there has much disagreement on validity, was compounded by presumed loss type series E. fornicatus. recently reviewed using morphometrics associate specimens clades...

10.3390/insects10090261 article EN cc-by Insects 2019-08-22

Three new species from China (Yunnan), Scolytoplatypus costatus Gebhardt Beaver, S. geminus Beaver and peniculatus are described compared with related of the genus. The male prosternum Asian shows species-specific characters, frequently bears a pair processes on or close to anterior margin. We comment here for first time movement their likely functions, survey occurrence in Scolytoplatypus.

10.11646/zootaxa.5082.5.6 article EN Zootaxa 2021-12-20

Trophic relations of 95 insect-dominated food webs from seven habitat categories are examined and discussed in relation to current ecological theory. We identify 13 salient patterns, which fewer than half have been reported previously other food-web studies. (1) Analysis trophic links the 61 community-type corroborate well-known trend that diversity insects has increased over evolutionary time. (2) Numbers saprophages animal parasites follow a continuum ranging grazer-based systems...

10.1086/285185 article EN The American Naturalist 1991-05-01

units or ecological 'islands' scattered through other habitats. Communities develop within them that are characterized by the absence of green plants and presence a diverse fauna arthropods as well multitudinous microorganisms. These communities have at their disposal limited amount energy, which is gradually used up activities community members. The successional changes take place in these usually rapid, occurring on scale days (or even hours) rather than years. largely results organisms...

10.2307/3640 article EN Journal of Animal Ecology 1977-10-01

The present state of knowledge the scolytine ambrosia beetles Thailand is summarised to provide a basis for future studies fauna and its economic importance in forestry, timber production crop tree plantations. A checklist provided with information on local world distribution, host trees, biology taxonomy. Six faunal elements based geographical altitudinal preferences species are discussed. One hundred sixty-one recorded from Thailand, 67 them first time. following new synonym proposed:...

10.11646/zootaxa.3875.1.1 article EN Zootaxa 2014-10-21

The following 13 new combinations are given: Ambrosiophilus osumiensis (Murayama, 1934), Ancipitis machili (Niisima, 1910), Cyclorhipidion bispinum (Nobuchi, 1981), japonicum laetum 1909), misatoense miyazakiense 1936), okinosenense 1961), takinoyense 1953), Debus defensus (Blandford, 1894), Immanus permarginatus (Schedl, 1933), Microperus calamoides quercicola (Eggers, 1926), all originally described in Xyleborus Eichhoff, 1864. 24 synonyms proposed: atratus (Eichhoff, 1876) (=Xyleborus...

10.11646/zootaxa.4521.3.5 article EN Zootaxa 2018-11-14

DNA holds great potential for species identification and efforts to create a database of all animals plants currently contains >7.5 million sequences representing ~300,000 species. This promise universally applicable tool suggests that morphologically based tools taxonomists will soon not have utility. Here we demonstrate DNA-based is reliable without the contributions taxonomic experts. We use ambrosia beetles (Xyleborini), which are known diversity as well global invasions damage, test...

10.3389/fevo.2020.00027 article EN cc-by Frontiers in Ecology and Evolution 2020-02-25

A new genus of xyleborine ambrosia beetle, Melanesicus Beaver & Petrov gen. n., with type species Xyleborus partitus Browne (1974) is described from the Melanesian region. The following combinations are proposed: M. caledoniae (Beaver Liu, 2016) comb. deformatus (Browne, 1974) granulosus (Schedl, 1975) all Eichhoff, 1864. tishechkini sp. n. Vanuatu, and nukuruanus Fiji. taxonomy, distribution biology included briefly reviewed.

10.11646/zootaxa.4949.1.9 article EN Zootaxa 2021-03-23

Abstract A cladistic analysis of morphological characters the subtribe Xyleborina (Curculionidae, Scolytinae) is presented. An examination individual revealed little phylogenetic information in many currently used for delimiting genera. Phylogenetically stable were evaluation contemporary generic concept. The following genera have been recovered as monophyletic: Cnestus , Dryocoetoides Eccoptopterus Xylosandrus Schedlia Sampsonius and Taurodemus . found to be polyphyletic: Amasa Ambrosiodmus...

10.1111/j.1365-3113.2007.00386.x article EN Systematic Entomology 2007-06-01

An illustrated key to seventeen species of Bostrichidae recorded in association with rubberwood Thailand is provided. A checklist given nine infesting sawn timber sawmills southern Thailand, information on distribution, host trees and biology. Three are for the first time from Thailand: Cephalotoma tonkinea Lesne, Lyctoxylon dentatum (Pascoe), Minthea reticulata Lesne.

10.3897/zookeys.26.88 article EN cc-by ZooKeys 2009-10-30

The Southeast Asian xyleborine ambrosia beetle fauna is reviewed for the first time. Thirty-four genera and 315 species are reviewed, illustrated, keyed to species. Sixty-three new described: Amasa cycloxystersp. nov., galeodermasp. gibbosasp. linisp. tropidacronsp. youliisp. Ambrosiophilus caliginestrissp. indicussp. lannaensissp. papilliferussp. wantaneeaesp. Anisandrus achaetesp. aucosp. auratipilussp. congruenssp. cryphaloidessp. feroniasp. herasp. paragogussp. sinivalisp. venustussp....

10.3897/zookeys.983.52630 article EN cc-by ZooKeys 2020-11-03

Abstract Inbreeding and parthenogenesis are especially frequent in colonizing species of plants animals, inbreeding wood‐boring the weevil families Scolytinae Platypodidae is common on small islands. In order to study relationship between colonization success, island attributes mating system these beetles, we analysed relative proportions inbreeders outbreeders for 45 Pacific Old World tropical islands plus two adjacent mainland sites, scored size, distance from nearest source population,...

10.1046/j.1466-822x.2001.00242.x article EN Global Ecology and Biogeography 2001-07-01

Abstract Cylindrobrotus pectinatus gen. et sp.n. , a new scolytine species from Cretaceous Lebanese amber, is described. A tribe, Cylindrobrotini trib.n. proposed for this unique species, which demonstrates an unusual combination of some archaic and many advanced characters. This finding suggests that the Scolytinae became distinct lineage Curculionoidea Lower Cretaceous. Fossil records are reviewed, remarks on origin taxonomic position bark ambrosia beetles made. Some comments various...

10.1111/j.1365-3113.2008.00442.x article EN Systematic Entomology 2009-01-01
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