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 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.

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.

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).

Additions to the Eocene Perissodactyla of the Margaret Formation, Eureka Sound Group, Ellesmere Island, Arctic Canada

2015 ◽  
Vol 52 (2) ◽  
pp. 123-133 ◽  
Author(s):  
Jaelyn J. Eberle ◽  
David A. Eberth
Keyword(s):  
United States ◽  
British Columbia ◽  
Middle Eocene ◽  
The United States ◽  
Geographic Range ◽  
Ellesmere Island ◽  
Early Eocene ◽  
Arctic Canada ◽  
Fossil Assemblages ◽  
Freezing Temperatures

We describe early Eocene (Wasatchian) occurrences of the isectolophid Homogalax, tapiroids Heptodon posticus, Heptodon cf. H. posticus, and Heptodon sp., as well as early middle Eocene (Bridgerian) fossils of the brontothere Palaeosyops from localities in the Margaret Formation of the Eureka Sound Group on Ellesmere Island, Nunavut, Arctic Canada. Their occurrence on Ellesmere Island considerably extends the geographic range of these taxa, previously known from mid-latitude localities in British Columbia (only Heptodon), the Western Interior of the United States, and Asia (Homogalax, Heptodon, and Palaeosyops). We also place the fossil localities near Bay Fiord on central Ellesmere Island into a refined lithostratigraphic framework based upon data from three measured stratigraphic sections. Our stratigraphic data confirm the presence of two, stratigraphically distinct fossil assemblages — a late Wasatchian-aged lower assemblage and a Bridgerian-aged upper assemblage that were previously hypothesized by others based on faunal differences — that are separated by a 478 m thick stratigraphic gap that appears to lack fossil vertebrates. From a paleoenvironmental perspective, occurrence of the tapiroid Heptodon in the Eocene Arctic corroborates an hypothesis put forward by others that tapiroids are proxies for densely forested habitats, although they were adapted to a range of temperatures including near (or at) freezing temperatures of Eocene Arctic winters. Further, Arctic occurrences of tapiroids and brontotheres imply that these typical mid-latitude ungulate mammals were adapted to Arctic environments, thereby increasing the probability of Trans-Beringian dispersal during early and middle Eocene time.

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

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4221 ◽  
Author(s):  
Daniel J. Erasmus ◽  
Emily A. Yurkowski ◽  
Dezene P.W. 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 possiblyCheumatopsyche 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.

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