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Western Canada is currently experiencing an epidemic infestation of mountain pine beetle (Dendroctonus ponderosae Hopkins). In British Columbia, the infestation extends over more than 13 million ha and has resulted in a wide-range of social, economic, and ecological impacts. In this study, we compile the known environmental drivers of the infestation and assess these drivers against the actual outcomes of the infestation to date. To support our investigation, we defined the population at risk to mountain pine beetle attack as the spatial extent of pine in British Columbia (approximately 525,329 km2) and used a range of driver variables known to influence the location and success of beetle infestations (i.e., proportion...
Modern chironomid assemblages consisting of 68 taxa were extracted from the sediments of 39 lakes in southwest Yukon and northern British Columbia, Canada. Important factors accounting for the distribution of the chironomid taxa include sediment organic matter (LOI; weight-loss-on-ignition), total phosphorus, bottom water temperature, and lake alkalinity. The results show the importance of organic matter, which is associated with water depth and lake productivity, in affecting chironomid community composition. Tanytarsus sp. C, Tanytarsus pallidicornis type, Allo/Mesopsectrocladius, Polypedilum, and Procladius were associated with lakes having high LOI values and shallow lake depths, while Paratanytarsus, Sergentia,...
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Monitoring 1-Changes in Plant and Animal Distribution: Fauna
Spiders (Arachnida: Araneae) are one of the most diverse and abundant taxa in the Arctic and are affected by fine scale changes in their environment, including temperature, precipitation, and habitat structure. This thesis describes research that occurred across the boreal forest tundra transition zone in the Yukon Territory, Canada. This study system provides an opportunity to test hypotheses about biogeographic patterns and determinants of diversity and life history of spiders in the north. There were four objectives of this research: first, to determine which environmental factors most influence spider assemblage structure (i.e., composition, richness, abundance) at a regional scale in the Arctic; second, to...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Invertebrates,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
The spruce beetle infestation has had variable impact on the understory spruce and deciduous species in the southwest Yukon. Possibilities for this variation include: light availability reaching the understory layer, forest succession, climatic stresses, and localized plot factors (aspect, elevation, slope position, site index, disturbance and severity, duration and the amount of elapsed time since the onset of the spruce beetle infestation). Revisiting and further elaboration (dividing plots into microsite characteristics such as aspect, site class, duration and severity of infestation, increasing the sample size, etc.) of this study is recommended. Recommendations for spruce beetle management strategies (no intervention...
BACKGROUND: Despite the ecological and agricultural significance of bumble bees in Alaska, very little is known and published about this important group at the regional level. The objectives of this study were to provide baseline data on species composition, distribution, seasonal biology, and parasites of the genus Bombus at three major agricultural locations within Alaska: Fairbanks, Delta Junction, and Palmer, to lay the groundwork for future research on bumble bee pollination in Alaska. NEW INFORMATION: A total of 8,250 bumble bees representing 18 species was collected from agricultural settings near Delta Junction, Fairbanks, and Palmer, Alaska in 2009 and 2010. Of the 8,250 specimens, 51% were queens, 32.7%...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Invertebrates,
Monitoring 1-Changes in Plant and Animal Distribution: Fauna
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