The Seasonal Cycle of Vitamin B12 in the Strait of Georgia, British Columbia

1973 ◽  
Vol 30 (2) ◽  
pp. 215-222 ◽  
Author(s):  
S. Allen Cattell
Keyword(s):  
British Columbia ◽  
Spatial Distribution ◽  
Particulate Matter ◽  
Vitamin B12 ◽  
Seasonal Cycle ◽  
Inorganic Nutrient ◽  
Vitamin B ◽  
Temporal And Spatial Distribution ◽  
Strait Of Georgia ◽  
Temporal And Spatial

The seasonal cycle of vitamin B12 in the Strait of Georgia, British Columbia, was studied over a 17-month period. The temporal and spatial distribution of this vitamin was found to be more complex than that of nitrate and phosphate in the Strait and B12 reported for other areas.The vitamin data are compared with inorganic nutrient distributions and physical characteristics of the Strait of Georgia to support the hypothesis that the observed heterogeneity of B12 is largely the result of vitamin–particulate matter interactions.

Temporal and Spatial Distribution of the Harmful Diatoms Chaetoceros concavicornis and Chaetoceros convolutus along the British Columbia Coast

1992 ◽  
Vol 49 (9) ◽  
pp. 1924-1931 ◽  
Author(s):  
L. J. Albright ◽  
S. Johnson ◽  
A. Yousif
Keyword(s):  
British Columbia ◽  
Spatial Distribution ◽  
Phytoplankton Assemblage ◽  
Temporal And Spatial Distribution ◽  
Strait Of Georgia ◽  
Low Salinity ◽  
Coastal Seawater ◽  
Temporal And Spatial

The harmful phytoplankters Chaetoceros concavicornis and Chaetoceros convolutus are normal components of the phytoplankton assemblage along the British Columbia coast. During 1988, these diatoms occurred at their highest concentrations in the spring and fall from the Strait of Georgia to Queen Charlotte Strait. North of Queen Charlotte Strait, the maximal concentrations appeared to be delayed until summer. The greatest concentrations occurred in the waters of the Strait of Georgia and its contiguous bays and inlets, especially Jervis Inlet, where concentrations of C. concavicornis and C. convolutus which could be harmful to salmon occurred during the spring and fall of 1988. Lesser concentrations occurred in coastal seawaters north of the Strait of Georgia. These phytoplankters were absent, or were present in only minor concentrations, in inlets with low-salinity waters such as Holberg Inlet and Indian Arm. Harmful Chaetoceros cells were restricted to seawaters greater than approximately 17‰ salinity. Vertically and horizontally well-mixed waters, such as those of Johnstone Strait, also appeared to restrict the presence of these cells. The greatest concentrations of these diatoms occurred during the spring and fall in relatively stratified coastal seawater with salinities between 26 and 34‰.

IDENTIFICATION OF CHRYSOPIDAE IN CANADA, WITH BIONOMIC NOTES (NEUROPTERA)

1985 ◽  
Vol 117 (6) ◽  
pp. 737-762 ◽  
Author(s):  
J.A. Garland
Keyword(s):  
British Columbia ◽  
Spatial Distribution ◽  
Life History ◽  
Geographic Distribution ◽  
New Combination ◽  
Generic Diagnosis ◽  
Temporal And Spatial Distribution ◽  
Ecological Implications ◽  
Temporal And Spatial ◽  
Southern Species

AbstractChrysopidae in Canada comprise 24 species in 9 genera and 2 subfamilies. Additional southern species are mentioned, 1 as a new combination, and other nomenclatorial changes are reviewed in relation to the Canadian fauna. Generic diagnosis of males employs sternum VIII + IX, the arcessus, gonapsis, pseudopenis, and tignum. Generic diagnosis of females is based on the dorsal furrow, ectoprocts, spermatheca, subgenitale, and a non-genitalic trait, the innermost gradate crossvein in the wings. The ecological implications and inherent difficulties in taxonomy are discussed for coloration in Chrysopidae, to develop a practical key to differentiate 26 species using color and other non-genitalic traits. A checklist summarizes maps of the geographic distribution in Canada and notes species in Alaska, based on specimens examined. Patterns of distribution for the Canadian chrysopid fauna are either Holarctic for 1 species or indigenously Nearctic, with eastern, western, or boreal foci. Disjunctions are apparent for species with a more southern, transcontinental distribution, which enter Canada primarily in Ontario and British Columbia. Life-history and bionomic notes are limited to 6 species in Canada, for which synonymies and figures are based on specimens examined. Most data originate from studies performed in Ontario. There are 5 species of parasites from 2 chrysopids. Hosts include 11 species of insects and mites, with 2 cases of hyperpredation. Three insecticides account for the more recent scarcity of chrysopids in the Niagara region. Conclusions relate the following: variable color in the 1 Holarctic species to post-glacial mingling in the northwest; gaps in temporal and spatial distribution to extinctions in progress; and renewed interest in Chrysopidae to earlier research on this group in Canada.

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