Allozyme diversity and gene flow in the bark beetle, Dendroctonus jeffreyi (Coleoptera: Scolytidae)

1999 ◽  
Vol 29 (3) ◽  
pp. 315-323 ◽  
Author(s):  
Diana L Six ◽  
T D Paine ◽  
J Daniel Hare
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Geographic Isolation ◽  
Average Heterozygosity ◽  
Allozyme Diversity ◽  
Dendroctonus Jeffreyi ◽  
Jeffrey Pine ◽  
Population Average ◽  
Pine Beetle ◽  
Dispersal Behavior

Genetic variation within and among 10 California populations of the Jeffrey pine beetle, Dendroctonus jeffreyi Hopkins, was assessed using allozymes. Of 21 loci assayed, 6 were polymorphic in at least one population. Average heterozygosity across all populations and loci was 4%. Genetic distance among the populations ranged from 0.001 to 0.060. The two most southern populations were the most differentiated. At two loci, alleles were present in the southern populations that were not present in any northern populations. The southern populations were also lacking an allele at one locus that was present in all northern populations. Geographic isolation is apparently responsible for allowing the divergence of the southern populations. A dendrogram estimating the relationships among the 10 populations was developed using restricted maximum likelihood. Evidence of inbreeding was found, which in these beetles may be closely tied to population size and dispersal behavior.

Isolation and endocrine regulation of an HMG–CoA synthase cDNA from the male Jeffrey pine beetle, Dendroctonus jeffreyi (Coleoptera: Scolytidae)

2000 ◽  
Vol 30 (12) ◽  
pp. 1203-1211 ◽  
Author(s):  
Claus Tittiger ◽  
Chatty O'Keeffe ◽  
Cody S Bengoa ◽  
Lana S Barkawi ◽  
Steven J Seybold ◽  
...  
Keyword(s):  
Endocrine Regulation ◽  
Dendroctonus Jeffreyi ◽  
Jeffrey Pine ◽  
Pine Beetle ◽  
Jeffrey Pine Beetle

Male Jeffrey pine beetle, Dendroctonus jeffreyi, synthesizes the pheromone component frontalin in anterior midgut tissue

2002 ◽  
Vol 32 (11) ◽  
pp. 1525-1532 ◽  
Author(s):  
G.M. Hall ◽  
C. Tittiger ◽  
G.J. Blomquist ◽  
G.L. Andrews ◽  
G.S. Mastick ◽  
...  
Keyword(s):  
Pheromone Component ◽  
Dendroctonus Jeffreyi ◽  
Jeffrey Pine ◽  
Pine Beetle ◽  
Anterior Midgut ◽  
Jeffrey Pine Beetle

scholarly journals Genetic Variation of Korean Pine (Pinus koraiensis Sieb. et Zucc.) at Allozyme and RAPD Markers in Korea, China and Russia

2005 ◽  
Vol 54 (1-6) ◽  
pp. 235-246 ◽  
Author(s):  
Z. S. Kim ◽  
J. W. Hwang ◽  
S. W. Lee ◽  
C. Yang ◽  
P. G. Gorovoy
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Russian Far East ◽  
Far East ◽  
The Other ◽  
Pinus Koraiensis ◽  
Korean Pine ◽  
Allozyme Diversity ◽  
Chinese Populations ◽  
Allozyme Loci

AbstractWe studied and compared genetic variation of Korean pine (Pinus koraiensis Sieb. et Zucc.) from 12 natural populations in Korea, China, and Russian Far East using allozymes and random amplified polymorphic DNAs (RAPDs). Eighteen polymorphic allozyme loci and 38 polymorphic RAPD fragments were analyzed. The level of allozyme diversity (A = 1.95, P95= 46.8%, Ho= 0.158, He= 0.169) and the degree of genetic differentiation (FST= 0.069) were comparable to those of other pines with similar life histories and ecological traits. Allozyme (He) as well as RAPD (Shannon’s index) variation decreased from south (Korea) to north (Russia), providing an evidence for the hypothesis of Korean pine’s northward migration. Differentiations among three different regions (Korea, China, and Russia) as well as among populations within regions were small. Substantial gene flow (Nm= 3.4) may be a partial explanation to this result. Clustering algorithms using various genetic distance measures showed some decisive geographic patterns at allozyme and RAPD level: the geographically close populations tended to be clustered together. On the other hand, two Chinese populations, Xobukho and Wangging, were grouped with the Russian populations rather than with the other Chinese populations. The Xiaoxing’anling and other mountains extended from north to south seemed to function as a barrier against gene flow between the Xobukho and Wangging (located east of the mountains) and the other Chinese P. koraiensis populations (located west of the mountains). The genetic diversities and differentiation estimated from RAPD data in Korean pine were congruent with those of allozymes.

Allozyme diversity and gene flow in Ophiostoma clavigerum (Ophiostomatales: Ophiostomataceae), the mycangial fungus of the Jeffrey pine beetle, Dendroctonus jeffreyi (Coleoptera: Scolytidae)

1999 ◽  
Vol 29 (3) ◽  
pp. 324-331 ◽  
Author(s):  
Diana L Six ◽  
T D Paine
Keyword(s):  
Sierra Nevada ◽  
Gene Diversity ◽  
Allozyme Diversity ◽  
San Bernardino Mountains ◽  
Dendroctonus Jeffreyi ◽  
Low Genetic Diversity ◽  
Jeffrey Pine ◽  
Sierra Nevada Mountains ◽  
Sexual Recombination ◽  
Mutualistic Association

Genetic variation within and among 10 California populations of Ophiostoma clavigerum (Robinson-Jeffrey & Davidson) Harrington associated with the mycangia of Dendroctonus jeffreyi Hopkins was assessed using allozymes. Gene diversity was uniformly low across all populations, averaging 1.4%. Only 2 of 19 gene loci assayed were polymorphic. The three most southerly populations (two from the San Bernardino Mountains in southern California and one from the southern tip of the Sierra Nevada Mountains) were the most differentiated; however, all populations exhibited very low genetic distance. Several factors alone, or in combination could be responsible for the low genetic diversity observed in these populations including (i) a rarity of sexual recombination, (ii) a history involving genetic bottlenecks, and (iii) selection for a mutualistic association with the host beetle.

scholarly journals Polygenic adaptation from standing genetic variation allows rapid ecotype formation

2021 ◽  
Author(s):  
Nico Fuhrmann ◽  
Celine Prakash ◽  
Tobias S. Kaiser
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Clock Genes ◽  
System Development ◽  
Nervous System Development ◽  
Geographic Isolation ◽  
Polygenic Adaptation ◽  
Circadian Clock Genes ◽  
Recent Establishment

AbstractAdaptive ecotype formation is the first step to speciation, but the genetic underpinnings of this process are poorly understood. While in marine midges of the genusClunio(Diptera) reproduction generally follows a lunar rhythm, we here characterize two lunar-arrhythmic eco-types. Analysis of 168 genomes reveals a recent establishment of these ecotypes, reflected in massive haplotype sharing between ecotypes, irrespective of whether there is ongoing gene flow or geographic isolation. Genetic analysis and genome screens reveal patterns of polygenic adaptation from standing genetic variation. Ecotype-associated loci prominently include circadian clock genes, as well as genes affecting sensory perception and nervous system development, hinting to a central role of these processes in lunar time-keeping. Our data show that adaptive ecotype formation can occur rapidly, with ongoing gene flow and largely based on a re-assortment of existing and potentially co-adapted alleles.

scholarly journals Endemic Jeffrey Pine Beetle Associates: Beetle/Mite Fungal Dissemination Strategies and Interactions That May Influence Beetle Population Levels

2021 ◽  
Vol 9 (8) ◽  
pp. 1641
Author(s):  
Javier E. Mercado ◽  
Beatriz Ortiz-Santana ◽  
Shannon L. Kay
Keyword(s):  
Bark Beetle ◽  
Mountain Pine Beetle ◽  
Jeffrey Pine ◽  
Mutualistic Interaction ◽  
Pine Beetle ◽  
Blue Stain Fungi ◽  
Blue Stain ◽  
Grosmannia Clavigera ◽  
Mutualistic Fungus ◽  
Jeffrey Pine Beetle

Fungal and mite associates may drive changes in bark beetle populations, and mechanisms constraining beetle irruptions may be hidden in endemic populations. We characterized common fungi of endemic-level Jeffrey pine beetle (JPB) in western USA and analyzed their dissemination by JPB (maxillae and fecal pellet) and fungivorous mites to identify if endogenous regulation drove the population. We hypothesized that: (1) as in near-endemic mountain pine beetle populations, JPB’s mutualistic fungus would either be less abundant in endemic than in non-endemic populations or that another fungus may be more prevalent; (2) JPB primarily transports its mutualistic fungus, while its fungivorous mites primarily transport another fungus, and (3) based on the prevalence of yeasts in bark beetle symbioses, that a mutualistic interaction with blue-stain fungi present in that system may exist. Grosmannia clavigera was the most frequent JPB symbiont; however, the new here reported antagonist, Ophiostoma minus, was second in frequency. As hypothesized, JPB mostly carried its mutualist fungus while another fungus (i.e., antagonistic) was mainly carried by mites, but no fungal transport was obligate. Furthermore, we found a novel mutualistic interaction between the yeast Kuraishia molischiana and G. clavigera which fostered a growth advantage at temperatures associated with beetle colonization.

Sign in / Sign up

Export Citation Format

Share Document