scholarly journals Tectonic assemblage map, Kootenay Lake, British Columbia-Alberta-U.S.A.

2000 ◽  
Author(s):  
J M Journeay ◽  
S P Williams ◽  
J O Wheeler
Keyword(s):  
British Columbia ◽  
Kootenay Lake

A Comparison of the Growth of Vertically-Migrating and Nonmigrating Kokanee (Oncorhynchus nerka) Fry

1990 ◽  
Vol 47 (3) ◽  
pp. 486-491 ◽  
Author(s):  
N. T. Johnston
Keyword(s):  
British Columbia ◽  
Vertical Migration ◽  
Growth Rates ◽  
Oncorhynchus Nerka ◽  
Geometric Mean ◽  
Adaptive Significance ◽  
Behavioural Thermoregulation ◽  
Kootenay Lake ◽  
Efficiency Hypothesis

A comparison of the growth of vertically-migrating kokanee (Oncorhynchus nerka) fry and nonmigrating fry confined to the epilimnion in thermally-stratified Kootenay Lake, British Columbia rejected the bioenergetic efficiency hypothesis for the adaptive significance of vertical migration. Growth rates were higher for nonmigrating fry than for vertically-migrating fry. Geometric mean wet weights in early October were 2.88 g for non-migrating fry and 1.40 g for vertically-migrating fry of the same stock. The geometric mean weight of fry of a second stock rearing in the isothermal West Arm, in which behavioural thermoregulation by vertical migration was not possible, was 8.54 g in early October.

Comparative feeding ecology and reproductive performance of ospreys in different habitats of southeastern British Columbia

1992 ◽  
Vol 70 (3) ◽  
pp. 470-475 ◽  
Author(s):  
Christoph Steeger ◽  
Hans Esselink ◽  
Ronald C. Ydenberg
Keyword(s):  
British Columbia ◽  
Feeding Ecology ◽  
Yellow Perch ◽  
Prey Species ◽  
Lepomis Gibbosus ◽  
Breeding Performance ◽  
Black Bullhead ◽  
Kootenay Lake ◽  
Catostomus Macrocheilus ◽  
Ictalurus Melas

We compared the general breeding and feeding ecology of ospreys (Pandion haliaetus) in the Creston and Nelson areas of southeastern British Columbia. In the Creston Valley, ospreys nested atop tall trees surrounding a shallow and productive warm-water marsh. Prey species taken by male ospreys included black bullhead (Ictalurus melas), pumpkinseed (Lepomis gibbosus), and yellow perch (Perca flavescens). In contrast, near Nelson, ospreys nested on man-made structures along the narrow West Arm of Kootenay Lake. Osprey prey species in the Nelson area included longnose sucker (Catostomus catostomus), largescale sucker (Catostomus macrocheilus), and mountain whitefish (Prosopium williamsoni). Prey captured at Nelson were larger and contained significantly more energy than at Creston Valley, and hunting from a perch was used for 26% of all captures. All Creston Valley prey were caught by flight hunting. The strike success of foraging ospreys at Nelson was significantly higher than at Creston, and the net yield of flight hunting was 3 times higher. In spite of these differences, the breeding performance of ospreys in the two areas was very similar. Average clutch size was 2.8, brood size at hatching was 2.0, and the average pair fledged 1.4 young. The nest failure rate did not differ between the two areas. Most clutches were initiated in early May, with Nelson-area ospreys laying, on average, 4–7 days later. Egg volumes were smaller at Nelson (66.6 vs. 69.1 cm3). However, the rate at which nestlings gained mass was significantly greater at Nelson. We discuss reasons why the breeding performance varies so little in spite of the great differences in feeding regime.

Seasonal aspects of the surface and advective heat fluxes of Kootenay Lake, British Columbia

1982 ◽  
Vol 18 (5) ◽  
pp. 1493-1502 ◽  
Author(s):  
Ronald C. Wiegand ◽  
Eddy C. Carmack ◽  
Ralph J. Daley ◽  
Colin B. J. Gray ◽  
Steve Jasper ◽  
...  
Keyword(s):  
British Columbia ◽  
Heat Fluxes ◽  
Kootenay Lake ◽  
Seasonal Aspects

Successful Introduction of Mysis relicta Lovén into Kootenay Lake, British Columbia

1964 ◽  
Vol 21 (5) ◽  
pp. 1325-1327 ◽  
Author(s):  
R. A. H. Sparrow ◽  
P. A. Larkin ◽  
R. A. Rutherglen
Keyword(s):  
British Columbia ◽  
Mysis Relicta ◽  
Kootenay Lake

not available

Recent limnological changes in southern Kootenay Lake, British Columbia

1976 ◽  
Vol 54 (9) ◽  
pp. 1571-1578 ◽  
Author(s):  
James E. Cloern
Keyword(s):  
British Columbia ◽  
Species Composition ◽  
Chlorophyll A ◽  
Algal Blooms ◽  
Dissolved Phosphorus ◽  
Green Algal ◽  
Phosphate Loading ◽  
Kootenay Lake ◽  
Mean Concentration ◽  
Phosphorus Levels

In response to a significant abatement of phosphate loading and the construction of a dam on its major inflow (the Kootenay River), southern Kootenay Lake experienced a number of limnological changes between 1969 and 1974. Water temperatures in 1974–1975 were similar to those previously reported for 1966–1969. However, water transparency has increased, particularly during the spring months.Nitrate concentrations have remained unchanged since 1969, and ranged from 2 to 8 μM between 6 June 1974 and 22 May 1975. However, ammonium levels have been reduced in the winter months when mean concentration was about 1 μM. Dissolved phosphorus levels in 1966–1969 were consistently around 3 μM, but never reached 1 μM in 1974. Phytoplankton populations in 1974–1975 (measured as chlorophyll a) were lower than those during the 1966–1969 period, and evidence is presented that suggests that major shifts have occurred in the species composition of the phytoplankton. Whereas Kootenay Lake experienced blue–green and green algal blooms during the 1960's, no such phenomena were observed in 1974–1975 when the plankton was dominated by diatoms. Population maxima of the three most common zooplankters (Cyclops bicuspidatus, Diaptomus ashlandi, and Diaphanosoma leuchtenbergianum) have increased since 1966–1969.

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