Siliceous Microfossil Succession in the Sediments of McLeod Bay, Great Slave Lake, Northwest Territories

1990 ◽  
Vol 47 (10) ◽  
pp. 1865-1874 ◽  
Author(s):  
Eugene F. Stoermer ◽  
Claire L. Schelske ◽  
Julie A. Wolin
Keyword(s):  
Quantitative Analysis ◽  
Species Composition ◽  
Northwest Territories ◽  
Biogenic Silica ◽  
Drainage Basin ◽  
Atmospheric Transport ◽  
Nutrient Supply ◽  
Great Slave Lake ◽  
Recent Sediments ◽  
Post Industrial

Quantitative analysis of biogenic silica and siliceous microfossils preserved in sediments of McLeod Bay, Great Slave Lake, NWT, Canada, shows increased abundance and modified species composition in more recent sediments. Most of the observed increase has apparently occurred in the post-industrial era. Although McLeod Bay remains highly oligotrophic, increased microfossil flux and changes in species composition indicate increasing nutrient supply. Since there is little apparent anthropogenic modification of the bay's drainage basin or biotic communities, atmospheric transport of nutrients from remote sources may be implicated.

Fecundity Comparisons for Various Stocks of Lake Whitefish, Coregonus clupeaformis

1975 ◽  
Vol 32 (3) ◽  
pp. 404-407 ◽  
Author(s):  
M. C. Healey ◽  
C. W. Nicol
Keyword(s):  
Northwest Territories ◽  
Lake Erie ◽  
Fork Length ◽  
Nonlinear Relationship ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Limited Data ◽  
Relative Fecundity ◽  
Great Slave Lake ◽  
The Relationship

We found no significant differences in slope or intercept for the regression of loge fecundity on loge fork length among samples of whitefish from four lakes near Yellowknife in the Northwest Territories. The equation describing the relationship between fecundity and fork length for these populations was:[Formula: see text]Five other populations for which length–fecundity relationships could be calculated had length exponents ranging from 3.20 to 4.38, suggesting a nonlinear relationship between weight and fecundity. Six of the nine populations as well as four others for which limited data were available all had similar relative fecundities. Fish from Buck Lake in Alberta and from Lake Erie had high relative fecundities while fish from Great Slave Lake had low relative fecundity.

Life history differences between fat and lean morphs of lake charr (Salvelinus namaycush) in Great Slave Lake, Northwest Territories, Canada

Hydrobiologia ◽  
2016 ◽  
Vol 783 (1) ◽  
pp. 21-35 ◽  
Author(s):  
Michael J. Hansen ◽  
Nancy A. Nate ◽  
Louise Chavarie ◽  
Andrew M. Muir ◽  
Mara S. Zimmerman ◽  
...  
Keyword(s):  
Life History ◽  
Northwest Territories ◽  
Salvelinus Namaycush ◽  
Great Slave Lake ◽  
Lake Charr

Variability in ice phenology on Great Bear Lake and Great Slave Lake, Northwest Territories, Canada, from SeaWinds/QuikSCAT: 2000–2006

2009 ◽  
Vol 113 (4) ◽  
pp. 816-834 ◽  
Author(s):  
Stephen E.L. Howell ◽  
Laura C. Brown ◽  
Kyung-Kuk Kang ◽  
Claude R. Duguay
Keyword(s):  
Northwest Territories ◽  
Bear Lake ◽  
Great Slave Lake ◽  
Ice Phenology

Geology and petrochemistry of lower Aphebian (2.4–2.0 Ga) alkaline plutonic and hypabyssal rocks in the East Arm of Great Slave Lake, Northwest Territories

1979 ◽  
Vol 16 (1) ◽  
pp. 60-72 ◽  
Author(s):  
J. P. N. Badham
Keyword(s):  
Northwest Territories ◽  
Field Data ◽  
Easter Island ◽  
Chemical Data ◽  
Lower Proterozoic ◽  
Great Slave Lake ◽  
Data Support ◽  
Igneous Complexes ◽  
Igneous Activity ◽  
History Of

Two alkaline igneous complexes and three lines of diatreme breccias were emplaced in the East Arm of Great Slave Lake during the lower Proterozoic. Field relationships suggest that those rocks are broadly cogenetic and were emplaced about 2.1 Ga ago.One of the intrusions, the Easter Island dyke, was rotated subsequent to emplacement such that both top and bottom are now exposed. Field and petrographic data are indicative of progressive differentiation along (i.e., up) the dyke and are substantiated by chemical data. The differentiation history of the early gabbros of the Blachford Lake complex is similar. Late differentiates of both complexes closely resemble the igneous matrices of the breccias and petrographic and chemical data support the proposal of cogenesis and contemporaneity.The field data show that there was a period of significant faulting and concomitant alkaline igneous activity in the East Arm area in the lower Proterozoic.

Upper Llandovery and Wenlock graptolites from Prairie Creek, southern Mackenzie Mountains, Northwest Territories

1988 ◽  
Vol 25 (12) ◽  
pp. 1955-1971 ◽  
Author(s):  
Alfred C. Lenz
Keyword(s):  
North America ◽  
Species Composition ◽  
Northwest Territories ◽  
Sensu Stricto ◽  
Mackenzie Mountains ◽  
Rich Fauna

A moderately rich fauna of graptolites, comprising species dominated by Monograptus (sensu stricto), Retiolites, Stomatograptus, and Cyrtograptus is documented from Prairie Creek, southern Mackenzie Mountains, Northwest Territories. Graptolites of the upper Llandovery Monograptus turriculatus, Monograptus spiralis, and Cyrtograptus sakmaricus zones and of the Wenlock "unnamed zone" and Cyrtograptus rigidus and Monograptus testis – Cyrtograptus lundgreni zones are recognized. The species composition of these zones is significantly different from corresponding zones elsewhere in the Canadian Cordillera.Twenty-six species are described and illustrated, and of these, two are new: Stomatograptus canadensis and Cyrtograptus preclarus; and two species, Monograptus aff. riccartonensis and Cyrtograptus aff. sakmaricus might also be new. Several species, particularly Monograptus praecedens, Monograptus veles, and Monograptus cf. mutuliferus strigosus have not been prevously reported in North America.

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