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.

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.

scholarly journals Erosion rates as a potential bottom‐up control of forest structural characteristics in the Sierra Nevada Mountains

Ecology ◽  
2015 ◽  
Vol 96 (1) ◽  
pp. 31-38 ◽  
Author(s):  
David T. Milodowski ◽  
Simon M. Mudd ◽  
Edward T. A. Mitchard
Keyword(s):  
Sierra Nevada ◽  
Structural Characteristics ◽  
Bottom Up ◽  
Erosion Rates ◽  
Sierra Nevada Mountains

scholarly journals Detection of drought‐induced blue oak mortality in the Sierra Nevada Mountains, California

Ecosphere ◽  
2021 ◽  
Vol 12 (6) ◽  
Author(s):  
Margarita Huesca ◽  
Susan L. Ustin ◽  
Kristen D. Shapiro ◽  
Ryan Boynton ◽  
James H. Thorne
Keyword(s):  
Sierra Nevada ◽  
Blue Oak ◽  
Sierra Nevada Mountains ◽  
Oak Mortality

Drought year changes in streambank profiles on incised streams in the Sierra Nevada Mountains

Geomorphology ◽  
1996 ◽  
Vol 15 (1) ◽  
pp. 47-56 ◽  
Author(s):  
K. Lynn Zong ◽  
Sherman Swanson ◽  
Tom Myers
Keyword(s):  
Sierra Nevada ◽  
Sierra Nevada Mountains

Value Messages Collide with Reality: Joseph Kurihara and the Power of Informal Education

2010 ◽  
Vol 50 (1) ◽  
pp. 1-33 ◽  
Author(s):  
Eileen H. Tamura
Keyword(s):  
Sierra Nevada ◽  
Informal Education ◽  
Eastern Slope ◽  
Sierra Nevada Mountains ◽  
Oil Tank

On a cool, crisp winter afternoon in a California desert, at the foot of the eastern slope of the Sierra Nevada Mountains, a crowd of more than two thousand people gathered. Some were curious; more were angry. Before all of them, standing on an oil tank with a microphone and loudspeaker, forty-seven-year-old Joseph Y. Kurihara shouted angry words of defiance. Referring to the generally despised Fred Tayama, who was assaulted the night before, Kurihara bellowed, “Why permit that sneak to pollute the air we breathe? … Let's kill him and feed him to the roving coyotes! … If the Administration refuses to listen to our demand, let us proceed with him and exterminate all other informers in this camp.”

The Sigmocheirini, a xystodesmid milliped tribe in the Sierra Nevada Mountains, California, U.S.A. (Polydesmida: Xystodesmidae)

1995 ◽  
Vol 26 (3) ◽  
pp. 339-360 ◽  
Author(s):  
Rowland M. Shelley
Keyword(s):  
Sierra Nevada ◽  
New Genus ◽  
San Joaquin Valley ◽  
Western Slope ◽  
Kern County ◽  
Pigmentation Pattern ◽  
Sierra Nevada Mountains

AbstractThe xystodesmid milliped tribe Sigmocheirini occupies a band along the western slope of the Sierra Nevada Mountains and eastern fringe of the San Joaquin Valley from Placer to Kern counties, California. It is comprised of two genera, Sigmocheir Chamberlin, with three species occurring from Placer to Tulare counties, and the monotypic Ochthocelata gen. n., the sole component, O. adynata sp. n., occurring in northern Kern County. The species of Sigmocheir display a distinctive, trimaculate pigmentation pattern with yellow middorsal and paranotal spots; the coloration of O. adynata is unknown. Sigmocheir calaveras Chamberlin is a senior name for S. dohenyi Chamberlin, the spelling of which was subsequently corrected to danehyi and assigned to the new genus, Tuolumnia, a synonym of Sigmocheir. Sigmocheir furcata sp. n. is proposed for forms from the northern generic range. The southernmost species is S. maculifer (Chamberlin), comb. n., transferred from Harpaphe Cook. The Sigmocheirini are related to the sympatric tribe Xystocheirini; relationships within Sigmocheir are hypothesized as maculifer + (calaveras + furcata).

Cybaeus (Araneae: Cybaeidae): the consocius species group of the Californian clade

Zootaxa ◽  
2021 ◽  
Vol 4965 (3) ◽  
pp. 401-436
Author(s):  
ROBB BENNETT ◽  
CLAUDIA COPLEY ◽  
DARREN COPLEY
Keyword(s):  
Sierra Nevada ◽  
Single Species ◽  
Species Group ◽  
Identification Key ◽  
Central Coast ◽  
Distribution Maps ◽  
The Third ◽  
Sierra Nevada Mountains ◽  
Moist Forest ◽  
Species Groups

Species of North American Cybaeus L. Koch (Araneae: RTA clade: Cybaeidae) are common moist-forest spiders classified in Holarctic and Californian clades. Here, in the third paper in a planned series reviewing the six Californian clade species groups, we review the species of the consocius group. We recognize nine species: Cybaeus consocius Chamberlin & Ivie, C. hesper Chamberlin & Ivie, C. hummeli Bennett spec. nov., C. opulentus spec. nov., C. pan Bennett spec. nov., C. penedentatus Bennett, C. simplex Roth, C. ubicki Bennett spec. nov., and C. vulpinus Bennett. Eight of these species have restricted distributions in the central Sierra Nevada Mountains of eastern California, U.S.A (C. opulentus, C. pan spec. nov., and C. vulpinus) or the central coast of western California (C. consocius, C. hesper, C. hummeli spec. nov., C. penedentatus, and C. ubicki spec. nov.); a single species (C. simplex), is relatively widely distributed in western Oregon, U.S.A. Descriptions, illustrations, distribution maps, and an identification key are provided as well as a discussion of conservation issues of relevance to the group. 

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