scholarly journals Willow Ptarmigan in the Boreal Forest of the Prairie Provinces

Blue Jay ◽  
1984 ◽  
Vol 42 (2) ◽  
Author(s):  
E. O. Hohn
Keyword(s):  
Boreal Forest ◽  
Willow Ptarmigan ◽  
Prairie Provinces

scholarly journals The Paleoecological Record of 6 ka BP Climate in the Canadian Prairie Provinces

2007 ◽  
Vol 49 (1) ◽  
pp. 81-98 ◽  
Author(s):  
Robert E. Vance ◽  
Alwynne B. Beaudoin ◽  
Brian H. Luckman
Keyword(s):  
Boreal Forest ◽  
Forest Fires ◽  
Pinus Banksiana ◽  
Summer Precipitation ◽  
Circulation Pattern ◽  
Mean Annual Precipitation ◽  
Mean Annual Temperature ◽  
Canadian Prairie ◽  
Temperature And Precipitation ◽  
Prairie Provinces

ABSTRACTSynthesis of available paleoecological studies in the Prairie provinces of Canada indicates that although the peak in postglacial aridity that characterized early Holocene climate of the western foothills and plains had passed, conditions remained warmer and drier than present throughout the region ca. 6000 yr BP Compared to today, treeline elevations were higher and alpine glaciers were reduced in size in the Rocky Mountains, lake levels were lower over much of the Interior Plains, and the grassland and boreal forest ecozones extended north of their present positions. Forest fires were more prevalent ca. 6000 yr BP than they are today, aiding westward migration of jack pine (Pinus banksiana) through the boreal forest and increasing the area occupied by grassland in boreal and montane forest regions. Attempts to quantify the magnitude of 6 ka temperature and precipitation differences have produced variable results, but suggest that mean annual temperature was 0.50°C to 1.50°C higher than today (summer temperature may have been up to 3°C higher) and mean annual precipitation was reduced by 65 mm (or summer precipitation was reduced by 50 mm), compared to present. The nature and scale of these changes suggests that a vigorous zonal atmospheric circulation pattern, similar to that of the 1930s but shifted northward, prevailed at 6 ka.

The perennial Juncus of section Poiophylli in the Canadian prairie provinces

1987 ◽  
Vol 65 (4) ◽  
pp. 750-760 ◽  
Author(s):  
P. M. Catling ◽  
K. W. Spicer
Keyword(s):  
Boreal Forest ◽  
Diagnostic Value ◽  
Canadian Prairie ◽  
Distribution Maps ◽  
Forest Region ◽  
Anther Length ◽  
Southern Alberta ◽  
The Status ◽  
Juncus Gerardii ◽  
Prairie Provinces

Specimens of the perennial Juncus of section Poiophylli in major Canadian herbaria were examined to clarify the status of the group in the prairie provinces and to evaluate diagnostic characters. Six taxa are recognized. Of these, Juncus interior, which occurs in the prairie region of southern Manitoba, southern Saskatchewan, and southern Alberta, has been largely overlooked. Juncus confusus, frequently confused with Juncus tenuis, is confined to southwestern Saskatchewan and southern Alberta. Juncus dudleyi is widespread and common throughout the three provinces, whereas Juncus vaseyi is widespread but clearly less common in the prairie region than in the more northerly boreal forest areas. Juncus tenuis, also found mostly in the boreal forest region, is apparently frequent only in central Saskatchewan and is rare elsewhere. Juncus compressus is recently adventive in southern Manitoba. Reports of Juncus gerardii are discounted and J. oronensis is considered to be a rare hybrid. The diagnostic value of characteristics of the leaf auricle is affirmed through correlation with other distinctive characters such as the shape of the bracteole apex and bracteole length and to a lesser extent with anther length and seed length. Although seed lengths differ between J. dudleyi and J. interior, there is sufficient overlap in the prairie provinces to make this character unreliable for identification. Other taxonomic characters are discussed and an illustrated key and distribution maps are included.

The changing disturbance regime of the boreal forest of the Canadian Prairie Provinces

2003 ◽  
Vol 79 (3) ◽  
pp. 502-516 ◽  
Author(s):  
K P Timoney
Keyword(s):  
Boreal Forest ◽  
Exotic Species ◽  
Deciduous Forest ◽  
Human Impacts ◽  
Coniferous Forest ◽  
Groundwater Depletion ◽  
Fragmented Landscape ◽  
Canadian Prairie ◽  
Boreal Ecosystem ◽  
Prairie Provinces

The subhumid boreal forest of western Canada is different today from what it was 25 years ago. Before the 1950s, the main human impacts on this forest were agricultural expansion, escaped settlement fires, and high-grade logging. The latter half of the 20th Century saw increased human stresses placed on the ecosystems, against a background of insect outbreaks and high forest fire activity. In the Prairie provinces, current annual area burned is greater and more variable than it was in the 1970s. Over the past 25 years, the area disturbed by insects (primarily forest tent caterpillar) and disease has declined, but both the area and timber volume logged have risen. The boreal forest (particularly its southern half) is being converted to a fragmented landscape dominated by young aspen, shrub, grass, plantations, exotic species, industrial infrastructure, and agricultural fields. The current disturbance level has increased to the point that forest land and volume losses now exceed forest accruals in some regions; average forest age and biomass have been declining since about 1970. Relative to past decades, the present subhumid boreal forest region of Canada is warmer, and more fragmented and dissected; it supports less old growth, less old white spruce, and more young aspen and recently disturbed areas; it has simplified and truncated age-class structures; and it has a greater prevalence of non-native plants. Future stresses may include in situ tar sands development, groundwater depletion or degradation, and water diversions. Should present trends continue, declining forest productivity and predictability, and spread of exotic species are likely, as is replacement of coniferous forest by deciduous forest in some regions. Stressed aquatic systems may undergo major changes in biotic composition, productivity, and physical characteristics. Without a rapid decrease in the rate of disturbances, the establishment of a more complete protected areas network, and the adoption of ecosystem-centred management, the subhumid boreal ecosystem will continue to be degraded. Key words: climate, defoliation, ecosystem, fire, logging, perturbation, petroleum, vegetation

scholarly journals Southerly movements of Willow Ptarmigan during the winter in and near the prairie provinces

Blue Jay ◽  
2021 ◽  
Vol 78 (4) ◽  
pp. 13-23
Author(s):  
Peter Taylor
Keyword(s):  
Willow Ptarmigan ◽  
Prairie Provinces

Southerly movements of Willow Ptarmigan during the winter in and near the prairie provinces

Chemical composition of aerosol during particle formation events in boreal forest

Tellus B ◽  
2001 ◽  
Vol 53 (4) ◽  
pp. 380-393 ◽  
Author(s):  
J. M. MÄKELÄ ◽  
S. YLI‐KOIVISTO ◽  
V. HILTUNEN ◽  
W. SEIDL ◽  
E. SWIETLICKI ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Boreal Forest ◽  
Particle Formation

Overview of the international project on biogenic aerosol formation in the boreal forest (BIOFOR)

Tellus B ◽  
2001 ◽  
Vol 53 (4) ◽  
pp. 324-343 ◽  
Author(s):  
M. KULMALA ◽  
K. HÄMERI ◽  
P. P. AALTO ◽  
J. M. MÄKELÄ ◽  
L. PIRJOLA ◽  
...  
Keyword(s):  
Boreal Forest ◽  
International Project ◽  
Aerosol Formation

NPP BOREAL FOREST: CONSISTENT WORLDWIDE SITE ESTIMATES, 1977-1994

2001 ◽  
Author(s):  
M. J. APPS ◽  
S. T. GOWER ◽  
O. N. KRANKINA ◽  
S. LINDER ◽  
R. J. OLSON ◽  
...  
Keyword(s):  
Boreal Forest
Sign in / Sign up

Export Citation Format

Share Document