THE GEOGRAPHIC RANGE OF IXODES SORICIS Gregson.

1946 ◽  
Vol 78 (11-12) ◽  
pp. 200-200 ◽  
Author(s):  
E. W. Jameson
Keyword(s):  
British Columbia ◽  
Geographic Range ◽  
Type Series ◽  
Marin County ◽  
Adult Females ◽  
Sorex Vagrans

Ixodes soricis Gregson is known from the type series of adult females, nymphs, and larvae collected by Gregson from long-tailed shrews (Sorex vagrans and S. setosus) in southwestern British Columbia, and from one female collected by Robert Holdenried from Sorex trowbridgii in Marin County, California (Cooley and Kohls, Nat. Inst. Health Bull. No. 184, 1945).

scholarly journals Identifying and Characterizing Important Trembling Aspen Competitors with Juvenile Lodgepole Pine in Three South-Central British Columbia Ecosystems

2012 ◽  
Vol 2012 ◽  
pp. 1-12
Author(s):  
Teresa A. Newsome ◽  
Jean L. Heineman ◽  
Amanda F. Linnell Nemec
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Geographic Range ◽  
Regression Analyses ◽  
Relative Height ◽  
Trembling Aspen ◽  
Ecosystem Productivity ◽  
Height Ratio ◽  
Critical Height ◽  
South Central

Critical height ratios for predicting competition between trembling aspen and lodgepole pine were identified in six juvenile stands in three south-central British Columbia ecosystems. We used a series of regression analyses predicting pine stem diameter from the density of neighbouring aspen in successively shorter relative height classes to identify the aspen-pine height ratio that maximizedR2. Critical height ratios varied widely among sites when stands were 8–12 years old but, by age 14–19, had converged at 1.25–1.5. MaximumR2values at age 14–19 ranged from 13.4% to 69.8%, demonstrating that the importance of aspen competition varied widely across a relatively small geographic range. Logistic regression also indicated that the risk of poor pine vigour in the presence of aspen varied between sites. Generally, the degree of competition, risk to pine vigour, and size of individual aspen contributing to the models declined along a gradient of decreasing ecosystem productivity.

A novel approach to compare pinniped populations across a broad geographic range

2015 ◽  
Vol 72 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Kathryn L. Sweeney ◽  
Kyle W. Shertzer ◽  
Lowell W. Fritz ◽  
Andrew J. Read
Keyword(s):  
Geographic Range ◽  
Aerial Images ◽  
Distribution Model ◽  
Vital Rates ◽  
Adult Males ◽  
Population Declines ◽  
Sea Lions ◽  
Adult Females ◽  
Broad Region ◽  
Site Types

We utilized aerial images and employed photogrammetric methodologies to collect standardized lengths of Steller sea lions (Eumetopias jubatus) terrestrially hauled out. We conducted comparisons among all site types and separately for rookery and haulout site-types between the two distinct population segments (DPSs; eastern and western) and two broad regions within the western DPS experiencing contrasting population abundance trends. An observed adult female index was created from measurements of reproductive females — in the presence of a pup or juvenile — and was applied as a model constraint for “adult females”. We fitted a finite mixture distribution model to the length-frequency data to estimate the proportion population for three delineated age–sex classes (juveniles, adult females, and adult males) and mean length for juveniles and adult males. Estimated proportions reflected what we expected; however, the broad region within the western DPS exhibiting substantial population declines had greater proportion of all age–sex classes on rookery sites than increasing broad region. Adult sea lions were significantly shorter in the eastern DPS than the western area, providing further evidence of morphological differences between the DPSs. We also introduce a less resource-demanding method for estimating population demographics, and potentially vital rates, for pinnipeds across a vast geographic range.

Revision of Hamites wernickei (Cephalopoda, Ancyloceratina) from the classic Lüneburg section (Upper Cretaceous, northern Germany)

2016 ◽  
Vol 66 (4) ◽  
pp. 627-644
Author(s):  
Birgit Niebuhr ◽  
John W.M. Jagt
Keyword(s):  
Upper Cretaceous ◽  
Typical Feature ◽  
Geographic Range ◽  
Northern Spain ◽  
Northern Germany ◽  
Southern France ◽  
Type Series ◽  
Upper Austria ◽  
Upper Campanian

Abstract A re-examination of heteromorph ammonites of late Campanian age from the Zeltberg section at Lüneburg has demonstrated that the type series of Hamites wernickei in fact comprises two different species that are here assigned to the nostoceratid Nostoceras Hyatt, 1894 and the polyptychoceratid Oxybeloceras Hyatt, 1900. Nostoceras (Didymoceras) wernickei (Wollemann, 1902) comb. nov., to which three of the four specimens that were described and illustrated by Wollemann (1902) belong, has irregularities of ribbing and tuberculation and changes its direction of growth at the transition from the helicoidal whorls to the hook, which is a typical feature of members of the subfamily Nostoceratinae. Torsion of body chambers is not developed in hairpin-shaped ammonite species, which means that the species name wernickei is no longer available for such polyptychoceratine diplomoceratids. Consequently, the fourth specimen figured and assigned to Hamites wernickei by Wollemann (1902) is here transferred to Oxybeloceras and considered conspecific to material from the Hannover area (Lehrte West Syncline) as O. aff. crassum (Whitfield, 1877). In addition to the “Heteroceras-Schicht des Mucronaten-Senons” of Lüneburg (bipunctatum/roemeri Zone, upper upper Campanian), the geographic range of N. (D.) wernickei probably includes Upper Austria, Tunisia and the Donbass region, while O. aff. crassum is known from the Hannover area (northern Germany), southern France, northern Spain and Upper Austria.

BIONOMICS OF ENOCLERUS BARRI (COLEOPTERA: CLERIDAE)

1969 ◽  
Vol 101 (4) ◽  
pp. 382-386 ◽  
Author(s):  
Richard E. Rice
Keyword(s):  
British Columbia ◽  
Life Cycle ◽  
North America ◽  
Sex Ratio ◽  
Rocky Mountain ◽  
Mountain Region ◽  
Western North America ◽  
Adult Females ◽  
Rocky Mountain Region ◽  
Life Cycle Stages

AbstractEnoclerus barri Knull occurs in western North America from British Columbia south to Mexico and throughout the Rocky Mountain region. Adults were collected at Grass Valley, Calif., from May to September at traps baited with beetle attractants. Collections occurred at temperatures ranging from 22.5° to 31 °C; the sex ratio of trapped beetles was 4.5 females to 1 male. Duration of life cycle stages at 24 ± 2 °C were: egg, 9 days; larva, first iastar, 14 days; second instar, 12 days; third instar feeding stage, 14 days. All larvae reared to third instar failed to pupate in the laboratory. Adult females of unknown age when collected lived from 10 to 131 days and produced an average of 389 eggs per female. Enoclerus barri utilized six species of Scolytidae as hosts in the laboratory.

Extension of the Known Range of the Masked Greenling, Hexagrammos octogrammus, to British Columbia

1971 ◽  
Vol 28 (6) ◽  
pp. 927-928
Author(s):  
Alex E. Peden
Keyword(s):  
British Columbia ◽  
Geographic Range

Previously, the known geographic range of the masked greenling, Hexagrammos octogrammus (Pallas), extended north and west of Sitka, Alaska. The capture of four juvenile specimens from Stephens Island near Prince Rupert extends the known range by more than 200 miles and provides the first records of this species from British Columbia.

scholarly journals Population Ecology of Caribou in British Columbia

Rangifer ◽  
1996 ◽  
Vol 16 (4) ◽  
pp. 73 ◽  
Author(s):  
D.R. Seip ◽  
D.B. Cichowski
Keyword(s):  
British Columbia ◽  
Canis Lupus ◽  
Rangifer Tarandus ◽  
Population Decline ◽  
Predation Rate ◽  
Mortality Rates ◽  
Geographic Range ◽  
Population Declines ◽  
Wolf Predation ◽  
Close Proximity

The abundance and geographic range of woodland caribou (Rangifer tarandus caribou) decreased in many areas of British Columbia during the 1900's. Recent studies have found that predation during the summer is the major cause of mortality and current population declines. Increased moose {Alecs alces) populations may be related to past and current caribou declines by sustaining greater numbers of wolves (Canis lupus). Mortality rates were greater in areas where caribou calved in forested habitats, in close proximity to predators and moose. Caribou populations which had calving sites in alpine areas, islands, and rugged mountains experienced lower mortality and were generally stable or increasing. A predator-induced population decline in one area appeared to stabilize at low caribou densities, suggesting that the wolf predation rate may be density dependent.

scholarly journals DNA barcode-based survey of Trichoptera in the Crooked River reveals three new species records for British Columbia

2017 ◽  
Author(s):  
Daniel J Erasmus ◽  
Emily A Yurkowski ◽  
Dezene PW Huber
Keyword(s):  
British Columbia ◽  
New Species ◽  
Dna Barcoding ◽  
Dna Barcode ◽  
Geographic Range ◽  
Aquatic Macroinvertebrates ◽  
Aquatic Systems ◽  
Anthropogenic Pressures ◽  
Three New Species ◽  
Occurrence Records

Anthropogenic pressures on aquatic systems have placed a renewed focus on biodiversity of aquatic macroinvertebrates. By combining classical taxonomy and DNA barcoding we identified 39 species of caddisflies from the Crooked River, a unique and sensitive system in the southernmost arctic watershed in British Columbia. Our records include three species never before recorded in British Columbia: Lepidostoma togatum (Lepidostomatidae), Ceraclea annulicornis (Leptoceridae), and Cheumatopsyche harwoodi (Hydropsychidae). Three other specimens may represent new occurrence records and a number of other records seem to be substantial observed geographic range expansions within British Columbia.

scholarly journals The Leech Haemopis lateromaculata (Hirudinea: Haemopidae): Its North America Distribution and Additional Notes on Species Description

2006 ◽  
Vol 120 (4) ◽  
pp. 443 ◽  
Author(s):  
Peter Hovingh
Keyword(s):  
United States ◽  
British Columbia ◽  
North America ◽  
Coastal Region ◽  
Reproductive Organs ◽  
Geographic Range ◽  
Geographical Region ◽  
Species Description ◽  
Pleistocene Refugia ◽  
Specific Variation

The geographic range of Haemopis lateromaculata Mathers 1963 (Hirudinea: Haemopidae) is extended across North America. Its distribution in the coastal region of Alaska and British Columbia suggests a coastal Pleistocene refugia separate from the populations in the lower United States and suggests that H. lateromaculata and the Eurasian H. sanguisuga Linnaeus 1758 are sister taxa. Support of the identification and geography is based on the anatomical positions of the reproductive organs in H. lateromaculata and H. marmorata Say 1824. The variations within these species are described, noting that no specific variation was confined to a geographical region.

Note on a second occurrence of thalattosaur remains (Reptilia: Neodiapsida) in British Columbia

1991 ◽  
Vol 28 (12) ◽  
pp. 2065-2068 ◽  
Author(s):  
Glenn W. Storrs
Keyword(s):  
British Columbia ◽  
Geographic Range ◽  
Range Extension ◽  
Late Triassic

A fragmentary thalattosaur specimen from the Late Triassic Pardonet Formation of northeastern British Columbia is the second reported occurrence of such animals in Canada. The group was previously known with certainty only from the Hosselkus Limestone of California, the Monte San Giorgio region shales of Italy and Switzerland, the Natchez Pass Formation of Nevada, and most recently, the Sulphur Mountain Formation of British Columbia. As such, the described material, which is indeterminate to genus, represents a slight geographic range extension of the Thalattosauria. The Norian age of this material represents a significant temporal range extension for the Thalattosauria, and it is the geologically youngest material known of this taxon.

Descriptions of Some Phytoseiide Mites (Acarina: Phytoseiidae). Part I. Nine New Species from British Columbia with Keys to the Species of British Columbia. Part II. Redescriptions of Eight Species Described by Berlese

1957 ◽  
Vol 89 (7) ◽  
pp. 289-308 ◽  
Author(s):  
D. A. Chant
Keyword(s):  
British Columbia ◽  
Lactic Acid ◽  
New Species ◽  
Plant Material ◽  
Chloral Hydrate ◽  
Phytoseiid Mites ◽  
Adult Females

In 1951 to 1955 Mr. N. H. Anderson of the Belleville laboratory, and Mr. C. V. G. Morgan, Entomology Laboratory, Summerland, B.C., collected plant material in southern British Columbia to investigate the distribution there of phytoseiid mites. Many phytoseiids in this material were apparently undescribed, and in 1956 the author collected further specimens. Nine undescribed forms were found; descriptions of these are given below, with a key for identifying the adult females of all phytoseiid species known to occur in British Columbia. The new species all are of the genus Typhlodromus Scheuten, 1957, as defined by Chant (in preparation). The mites were cleared in chloral hydrate or lactic acid and mointed in Berlese's fluid; but some were mounted directly in De Faure's fluid. The measurements given are of the greatest lengths and widths of the dorsal and ventri-anal shields, and whenever possible are the means for 10 specimens. The setal terminology of Garman (1948) and Nesbitt (1951) is followed. All specimens referred to were collected in British Columbia unless otherwise stated.

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