Studies on the Silver-spotted Tiger Moth, Halisidota argentata Pack. (Lepidoptera: Arctiidae), in British Columbia

1958 ◽  
Vol 90 (2) ◽  
pp. 65-80 ◽  
Author(s):  
G. T. Silver
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Douglas Fir ◽  
River Valley ◽  
Fraser River ◽  
Natural Control ◽  
Control Factors ◽  
Single Colony ◽  
Tiger Moth ◽  
Northern Portion

The silver-spotted tiger moth, Halisidota argentata Pack., is a potentially dangerous defoliator of Douglas fir in British Columbia. Natural control factors have always prevented populations from building up to destructive proportions.The literature contains little information on this insect. Fletcher recorded the first outbreak of what was probably H. argentata in British Columbia in 1887 (2). Moths were identified as H. sobrina Stretch, but this form is now recorded only from California so it was probably H. argentata. The outbreak, probably on southern Vancouver Island, was reported as “committing great depredations on the spruces here.” Mathers found H. argentata at Chilliwack in the Fraser River Valley in 1934, but there was no report of an outbreak (4). A few larvae were collected on southern Vancouver Island from 1936 to 1952. In 1953 a considerable number of colonies were observed, and the following year the silver-spotted tiger moth was in infestation proportions. In 1955 the outbreak increased in intensity, and spread northward to the limit of its known range. A survey in the spring of 1956 failed to find a single colony south of Lantzville, and the population in the northern portion of the range was greatly reduced.

scholarly journals Mapping the environmental limitations to growth of coastal Douglas-fir stands on Vancouver Island, British Columbia

2007 ◽  
Vol 27 (6) ◽  
pp. 805-815 ◽  
Author(s):  
N. C. Coops ◽  
S. B. Coggins ◽  
W. A. Kurz
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Douglas Fir

RECORDS OF ADDITIONAL EUROPEAN SAWFLIES IN AMERICA AND DESCRIPTIONS OF NEW VARIETIES OF NORTH AMERICAN SPECIES

1932 ◽  
Vol 64 (11) ◽  
pp. 247-251 ◽  
Author(s):  
Herbert H. Ross
Keyword(s):  
British Columbia ◽  
North American ◽  
West Coast ◽  
River Valley ◽  
North American Species ◽  
Alnus Rubra ◽  
Fraser River ◽  
The West ◽  
New Varieties ◽  
The Common

This species has apparently been introduced in recent years and become established as a pest of the common native alder (Alnus rubra) on the west coast of Washington and British Columbia, particularly in the lower part of the Fraser River Valley. The earliest specimens I have at hand are a series of 15 females taken at White Rock, B. C., June 28, 1929, collected by Mr. G. Beall.

Effects of agricultural runoff on native amphibians in the Lower Fraser River Valley, British Columbia, Canada

2002 ◽  
Vol 21 (2) ◽  
pp. 353-360 ◽  
Author(s):  
Shane R. de Solla ◽  
Karen E. Pettit ◽  
Christine A. Bishop ◽  
Kimberly M. Cheng ◽  
John E. Elliott
Keyword(s):  
British Columbia ◽  
Agricultural Runoff ◽  
River Valley ◽  
Fraser River

POTASSIUM RELATIONSHIPS IN SOME BRITISH COLUMBIA SOILS

1967 ◽  
Vol 47 (1) ◽  
pp. 49-53
Author(s):  
E. H. Gardner
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Glacial Till ◽  
Fraser River ◽  
Parent Materials ◽  
Exchangeable K ◽  
Lower Fraser Valley ◽  
Fraser Valley

The estimated amounts of micaceous minerals and of certain forms of K, namely total, slowly available, and exchangeable K, varied considerably among soils of southwest British Columbia. The amounts of different forms of K were related to the amounts of micaceous minerals. The amounts of the various forms of K in the soils were related to one another. The Vancouver Island soils formed on marine and glacial till parent materials contained less mica and K than the Lower Fraser Valley soils formed on Fraser river alluvium. In most instances the contents of the various forms of K were not related to the amounts of silt and clay in the soils.

Variation in climate-growth relationships for Douglas-fir growth across spatial and temporal scales on southern Vancouver Island, British Columbia

2019 ◽  
Vol 444 ◽  
pp. 30-41
Author(s):  
Hardy P. Griesbauer ◽  
Heather Klassen ◽  
Sari C. Saunders ◽  
David L. Spittlehouse
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Temporal Scales ◽  
Spatial And Temporal Scales

Biochemical Genetic Stock Identification of Chum Salmon (Oncorhynchus keta) in Southern British Columbia

1985 ◽  
Vol 42 (3) ◽  
pp. 437-448 ◽  
Author(s):  
Terry D. Beacham ◽  
Ruth E. Withler ◽  
Allan P. Gould
Keyword(s):  
British Columbia ◽  
Chum Salmon ◽  
Vancouver Island ◽  
Oncorhynchus Keta ◽  
Significant Heterogeneity ◽  
Stock Identification ◽  
Fraser River ◽  
Genetic Stock ◽  
Allelic Frequencies ◽  
Chum Salmon Oncorhynchus Keta

We used electrophoresis to examine genetic variability of 33 chum salmon (Oncorhynchus keta) stocks in southern British Columbia and used differences in genotypic frequencies among these stocks for estimating stock compositions in a weekly fishery in upper Johnstone Strait. Seven polymorphic loci were used for stock identification. Chum salmon from the Fraser River, Bute and Toba inlets, Vancouver Island, and the southern Mainland had significantly different allelic frequencies, but there was also significant heterogeneity in allelic frequencies at some loci within each region. Allelic frequencies were generally stable over a 2-yr period in nine stocks for which consecutive annual sampling was conducted. There was no significant two-locus linkage disequilibrium for the chum salmon stocks surveyed. Cluster analysis indicated that Fraser River and Bute and Toba Inlet stocks were distinctive, but Vancouver Island and Mainland stocks were not. The timing and relative abundance of Fraser River chum salmon in upper Johnstone Strait as estimated by electrophoretic analysis was confirmed by an in-river test fishery in the Fraser River.

Underground Houses on the British Columbian Coast

1944 ◽  
Vol 9 (3) ◽  
pp. 265-270 ◽  
Author(s):  
H. G. Barnett
Keyword(s):  
British Columbia ◽  
Bering Sea ◽  
Pacific Coast ◽  
River Valley ◽  
Fraser River ◽  
Northern California ◽  
The South ◽  
The North ◽  
The Pacific ◽  
The Way

Semi-Subterranean houses with an entrance through the roof are a well known feature of the interior of British Columbia, having been described for the Thompson, the Chilcotin, the Shuswap and others of the upper Fraser River valley. They have, in fact, an even wider distribution east of the Coast and Cascade Ranges, extending south over the Plateau and into northern California. Although this type of dwelling existed among the Aleuts, it appears that the coastal people to the south of them, even in Alaska, were either unfamiliar with the pattern or rejected it in favor of others. Sporadically, along the Pacific Coast all the way from California to Bering Sea, house floors were excavated to varying depths, sometimes even to two levels; but, everywhere, the houses characteristically lack the roof entrance and, except for sweathouses in the south and Bering Sea Eskimo dwellings in the north, even the idea of an earth covering is absent. In view of this fundamental divergence, it is interesting that subterranean structures do appear in several places on the coast of British Columbia.

Dieback of a 30-year-old Douglas-fir plantation in the Brittain River Valley, British Columbia: Symptoms and diagnosis

1984 ◽  
Vol 7 (4) ◽  
pp. 249-263 ◽  
Author(s):  
R.E. Carter ◽  
J. Otchere-Boateng ◽  
K. Klinka
Keyword(s):  
British Columbia ◽  
Douglas Fir ◽  
River Valley

Anomalous Occurrence of Carp (Cyprinus carpio) in the Marine Environment

1971 ◽  
Vol 28 (9) ◽  
pp. 1345-1347 ◽  
Author(s):  
W. E. Barraclough ◽  
D. G. Robinson
Keyword(s):  
British Columbia ◽  
Marine Environment ◽  
Surface Waters ◽  
Cyprinus Carpio ◽  
River Estuary ◽  
Vancouver Island ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Low Salinity ◽  
Carp Cyprinus Carpio

Juvenile carp (Cyprinus carpio) were caught with a surface trawl in low salinity surface waters of the Strait of Georgia, British Columbia, during July 1967. A natural environmental route is established for the possible movement of carp from the Fraser River estuary to watersheds on Vancouver Island.

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