Blood parasites of geese of the McConnell River, N.W.T.

1972 ◽  
Vol 50 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Gordon F. Bennett ◽  
Charles D. MacInnes
Keyword(s):  
Boreal Forest ◽  
North American ◽  
Plasmodium Species ◽  
Blood Parasites ◽  
Canada Geese ◽  
Young Of The Year ◽  
Low Incidence ◽  
Goose Species

Of 736 blue, snow, and Canada geese from the McConnell River, N.W.T. which were examined for blood parasites only 21 birds (2.9%) were found to be infected. Of these, 15 infections were with Leucocytozoon simondi (2.0%) and 2 each with Parahaemoproteus nettionis, Plasmodium species, and microfilaria. Both adults and young of the year were infected. We suggest that the low incidence is an indirect result of adaptations of the simuliid vectors to tundra conditions. It is possible that increased incidence of L. simondi in the boreal forest is a factor contributing to the restriction of five of the six North American goose species to the tundra nesting habit.

scholarly journals Effects of lightning and other meteorological factors on fire activity in the North American boreal forest: implications for fire weather forecasting

2010 ◽  
Vol 10 (14) ◽  
pp. 6873-6888 ◽  
Author(s):  
D. Peterson ◽  
J. Wang ◽  
C. Ichoku ◽  
L. A. Remer
Keyword(s):  
Boreal Forest ◽  
North American ◽  
Meteorological Factors ◽  
Convective Available Potential Energy ◽  
Fire Weather ◽  
Lightning Strikes ◽  
The North ◽  
Lightning Detection ◽  
Western Boreal Forest ◽  
Consecutive Dry Days

Abstract. The effects of lightning and other meteorological factors on wildfire activity in the North American boreal forest are statistically analyzed during the fire seasons of 2000–2006 through an integration of the following data sets: the MODerate Resolution Imaging Spectroradiometer (MODIS) level 2 fire products, the 3-hourly 32-km gridded meteorological data from North American Regional Reanalysis (NARR), and the lightning data collected by the Canadian Lightning Detection Network (CLDN) and the Alaska Lightning Detection Network (ALDN). Positive anomalies of the 500 hPa geopotential height field, convective available potential energy (CAPE), number of cloud-to-ground lightning strikes, and the number of consecutive dry days are found to be statistically important to the seasonal variation of MODIS fire counts in a large portion of Canada and the entirety of Alaska. Analysis of fire occurrence patterns in the eastern and western boreal forest regions shows that dry (in the absence of precipitation) lightning strikes account for only 20% of the total lightning strikes, but are associated with (and likely cause) 40% of the MODIS observed fire counts in these regions. The chance for ignition increases when a threshold of at least 10 dry strikes per NARR grid box and at least 10 consecutive dry days is reached. Due to the orientation of the large-scale pattern, complex differences in fire and lightning occurrence and variability were also found between the eastern and western sub-regions. Locations with a high percentage of dry strikes commonly experience an increased number of fire counts, but the mean number of fire counts per dry strike is more than 50% higher in western boreal forest sub-region, suggesting a geographic and possible topographic influence. While wet lightning events are found to occur with a large range of CAPE values, a high probability for dry lightning occurs only when 500 hPa geopotential heights are above ~5700 m and CAPE values are near the maximum observed level, underscoring the importance of low-level instability to boreal fire weather forecasts.

scholarly journals Forest management is driving the eastern North American boreal forest outside its natural range of variability

2009 ◽  
Vol 7 (10) ◽  
pp. 519-524 ◽  
Author(s):  
Dominic Cyr ◽  
Sylvie Gauthier ◽  
Yves Bergeron ◽  
Christopher Carcaillet
Keyword(s):  
Forest Management ◽  
Boreal Forest ◽  
North American ◽  
Natural Range ◽  
Natural Range Of Variability

The North American Species in Group VIII of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 159-172 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
Boreal Forest ◽  
North American ◽  
Rocky Mountains ◽  
North American Species ◽  
Group Viii ◽  
The North

AbstractGroup VIII of North American Ips contains I. interruptus (Mannerheim), I. engelmanni Swaine, I. amiskwiensis G. Hopping, I. sulcifrons Wood, I. pilifrons Swaine, I. yohoensis Swaine, I. tridens (Mannerheim) and I. semirostris G. Hopping. Females of some species have dense brushes of long setae or pads of short pile covering the frontal protuberance. Species are described and a key is given. All of them breed in spruce, six in the boreal forest and two farther south in the Rocky Mountains.

Catastrophic windstorm and fuel-reduction treatments alter ground beetle (Coleoptera: Carabidae) assemblages in a North American sub-boreal forest

2008 ◽  
Vol 256 (5) ◽  
pp. 1104-1123 ◽  
Author(s):  
Kamal J.K. Gandhi ◽  
Daniel W. Gilmore ◽  
Steven A. Katovich ◽  
William J. Mattson ◽  
John C. Zasada ◽  
...  
Keyword(s):  
Boreal Forest ◽  
North American ◽  
Ground Beetle ◽  
Fuel Reduction
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