Concentration of a molybdenite ore from Thunder Bay District, northwestern Ontario

1965 ◽  
Author(s):  
G I Mathieu
Keyword(s):  
Northwestern Ontario ◽  
Thunder Bay

scholarly journals Direct seeding of black spruce in northwestern Ontario: Temporal changes in seedbed coverage and receptivity

1995 ◽  
Vol 71 (2) ◽  
pp. 219-227 ◽  
Author(s):  
R. L. Fleming ◽  
D. S. Mossa
Keyword(s):  
Soil Moisture ◽  
Picea Mariana ◽  
Black Spruce ◽  
Temporal Changes ◽  
Direct Seeding ◽  
Organic Debris ◽  
Northwestern Ontario ◽  
Thunder Bay ◽  
Moisture Regimes ◽  
Trees And Shrubs

Temporal changes in black spruce (Picea mariana [Mill.] B.S.P.) seedbed coverage and seedbed receptivity were investigated on coarse-textured upland sites near Thunder Bay (48°25′N 89° 15′W), in northwestern Ontario. Sowing was completed in May for three consecutive years following summer scarification at each of 12 sites. Infilling by organic debris reduced the proportion of receptive soil strata three to five years after scarification by 50–95%. Receptive seedbed coverage declined more quickly on fresh Soil Moisture Regimes with a variety of deciduous trees and shrubs than on moist Soil Moisture Regimes dominated by eracaceous shrubs. Pioneer mosses, which are also good seedbeds, invaded moist sites more readily than fresh sites, and mitigated losses in seedbed coverage. Compact Sphagnum seedbeds in lowland depressions maintained good areal coverage much longer than did receptive upland soil strata. Seedling establishment ratios varied greatly among seeding years, seedbeds and sites, but there was an underlying trend of decreasing seedbed receptivity with time since scarification. Seedlings originating from the first seeding year were taller at age 7–10 than those originating from the second or third seeding years. Key words: direct seeding, seedbed coverage, seedbed receptivity, scarification, black spruce, Picea mariana

Habitat-dependent morphological and chemical variation in Picea mariana from northwestern Ontario

1983 ◽  
Vol 61 (6) ◽  
pp. 1573-1579 ◽  
Author(s):  
William H. Parker ◽  
P. Knowles ◽  
F. Bennett ◽  
A. Gray ◽  
T. Krickl
Keyword(s):  
Picea Mariana ◽  
Black Spruce ◽  
Alluvial Soil ◽  
Electrophoretic Analysis ◽  
The Other ◽  
Northwestern Ontario ◽  
Local Site ◽  
Thunder Bay ◽  
Heavy Soil ◽  
Sphagnum Bog

To determine whether local site differences corresponded to any morphological or chemical differentiation in Picea mariana, 10 cone-bearing trees were sampled from each of three semiadjacent stands near the Matawin River, Thunder Bay District, Ont.: (i) an upland forest on well-drained alluvial soil, (ii) an abandoned pasture on heavy soil, and (iii) a wet sphagnum bog. Nine cone characters and eight needle and twig characters were scored and analyzed. Differences among sites were generally small. Principal-components analysis demonstrated two major, independent trends of variation, one attributable mainly to cone characters and the other to needle characters. Bog trees tended to be more variable than the others with respect to cone characters but had similar levels of variation for needle and twig characters. Further comparisons were made based on foliar flavonoids of the 30 trees and isozyme characteristics of an expanded sampling of 60 trees. Flavonoid analysis indicated that a fraction of the bog trees possessed flavonoid diglycosides not present in the other trees. Five polymorphic enzyme systems were detected in electrophoretic analysis. Trees from the three sites had similar isozyme patterns with the exception of three bands that were unique to the bog site trees. Thus, the bog trees were more variable for cone, flavonoid, and isozyme characters but exhibited no greater variability for needle and twig characters. However, none of the data gave an indication of discrete ecotypes of black spruce corresponding to upland and lowland sites.

Phenology of Vaccinium spp. in a black spruce (Picea mariana) plantation in northwestern Ontario: possible implications for the timing of forest herbicide treatments

1998 ◽  
Vol 28 (10) ◽  
pp. 1579-1585 ◽  
Author(s):  
F M Moola ◽  
A U Mallik
Keyword(s):  
Leaf Senescence ◽  
Picea Mariana ◽  
Black Spruce ◽  
Target Species ◽  
Vaccinium Angustifolium ◽  
Delayed Treatment ◽  
Northwestern Ontario ◽  
Thunder Bay ◽  
Lowbush Blueberry ◽  
Vaccinium Myrtilloides

This study reports on the phenology of 180 vegetative and 180 reproductive shoots of lowbush blueberry (Vaccinium angustifolium Ait.) and velvet leaf blueberry (Vaccinium myrtilloides Michx.) in a young black spruce (Picea mariana (Mill.) BSP) plantation near Thunder Bay, northwestern Ontario. Leaves of both species emerged in mid-May and remained uniformly green until mid-August. By late August, the majority of tagged shoots had turned red and were beginning to deteriorate. Approximately 30% of tagged shoots lost their leaves by 25 September in both V. angustifolium and V. myrtilloides. Patterns of leaf development in V. angustifolium and V. myrtilloides suggest that Vaccinium spp. may be less susceptible to foliar-applied herbicides if applications are made during or following the period of leaf senescence (i.e., between late August and late September). However, delayed treatment may be impractical in conifer plantations, since the time of leaf senescence and abscission of blueberry coincides with that of many target species.

scholarly journals Consumption of Truffles and other Fungi by the American Red Squirrel (Tamiasciurus hudsonicus) and the Eastern Chipmunk (Tamias striatus) (Sciuridae) in Northwestern Ontario

2013 ◽  
Vol 127 (1) ◽  
pp. 57 ◽  
Author(s):  
Jocelin N. Teron ◽  
Leonard J. Hutchison
Keyword(s):  
Tamiasciurus Hudsonicus ◽  
Red Squirrel ◽  
Red Squirrels ◽  
Tamias Striatus ◽  
Eastern Chipmunk ◽  
Northwestern Ontario ◽  
Thunder Bay ◽  
Faecal Samples ◽  
The Family ◽  
Fungal Tissue

Faecal matter collected from the American Red Squirrel (Tamiasciurus hudsonicus) and the Eastern Chipmunk (Tamias striatus) on the campus of Lakehead University in Thunder Bay, Ontario, was examined for the presence of consumed fungal tissue. A total of 14 faecal samples were collected from live-trapped animals over six trapping periods (19 June to 25 September 2010). Eight samples contained intact remains of spores representative of hypogeous truffle fungi found in the genera Elaphomyces, Gautieria, Hymenogaster, Hysterangium, and Leucangium, as well as spores of epigeous mushrooms found in the orders Boletales and Pezizales and possibly in the family Tricholomataceae of the Agaricales. The results of this brief survey suggest not only the importance of mycophagy in the diet of American Red Squirrels and Eastern Chipmunks in the boreal mixed wood forests of northwestern Ontario but also the important role played by sciurids in vectoring spores of truffle fungi in this region.

Growth and yield comparisons for red pine, white spruce and black spruce plantations in northwestern Ontario

2011 ◽  
Vol 87 (04) ◽  
pp. 494-503 ◽  
Author(s):  
Krish Homagain ◽  
Chander Shahi ◽  
Willard Carmean ◽  
Mathew Leitch ◽  
Colin Bowling
Keyword(s):  
Black Spruce ◽  
Basal Area ◽  
White Spruce ◽  
Red Pine ◽  
Growth And Yield ◽  
Wood Production ◽  
Northwestern Ontario ◽  
Thunder Bay ◽  
Intensive Forest Management ◽  
Forest Lands

Intensive forest management for wood production requires that we identify our most productive forest lands as well as the most productive and most commercially valuable tree species that should be managed on these lands. The Thunder Bay Spacing Trial established in 1950 provides growth and yield comparisons on a productive site for red pine, white spruce, and black spruce. Our analysis based on six remeasurements from 1983 to 2007 show that red pine has produced more than twice the volume of white spruce and about three times the volume of black spruce. The greater volume for red pine in comparison to the spruces is attributed to taller trees, larger average diameters and more basal area.

scholarly journals Developing a woodland caribou habitat mosaic on the Ogoki-Nakina North Forests of northwestern Ontario

Rangifer ◽  
1998 ◽  
Vol 18 (5) ◽  
pp. 235
Author(s):  
I. Armstrong ◽  
G. Swant ◽  
H.R. Timmermann
Keyword(s):  
Forest Management ◽  
Fire History ◽  
Rangifer Tarandus ◽  
Planning Process ◽  
Woodland Caribou ◽  
Management Planning ◽  
Forest Management Planning ◽  
Habitat Mosaic ◽  
Northwestern Ontario ◽  
Thunder Bay

The Ogoki-North Nakina Forests consist of (10 638 km2) unroaded boreal forest approximately 400 km northeast of Thunder Bay, Ontario (lat 50°- 51°31'N, long 86°30'- 89°W). Woodland caribou (Rangifer tarandus caribou) inhabit discrete portions within these forests based on minimal current and past historical data. As part of the Forest Management Planning process, for the period 1997-2097, a woodland caribou habitat mosaic has been developed to coordinate present and future forest management activities with the retention and development of current and future woodland caribou habitat. Several criteria including, past fire history, forest structure, age, species composition, proximity to current road access and location of existing and potential caribou habitat, helped identify and delineate 50 mosaic harvest blocks. Each harvest block will be logged in one of five 20 year periods over a 100 year rotation (1997¬2097). The harvest blocks have been developed to simulate a pattern of past wildfire history in an area that has not been subjected to past forest management activities, while managing for woodland caribou, a locally featured species.

scholarly journals National Geochemical Reconnaissance Lake Sediment and Water Data, Thunder Bay Region, northwestern Ontario [NTS 52a and 52h South]

1990 ◽  
Author(s):  
P W B Friske ◽  
E H W Hornbrook ◽  
J J Lynch ◽  
M W McCurdy ◽  
H Gross ◽  
...  
Keyword(s):  
Lake Sediment ◽  
Northwestern Ontario ◽  
Thunder Bay
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