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Athabasca County No. 12 AB

A description of the reproductive biology of the fishing spider Dolomedes triton (Walck.) (Araneae: Pisauridae) in central Alberta

Author(s): Wojcicki, J. P.

Year: 1992

Field and laboratory observations were used to study the reproductive behaviours of the fishing spider Dolomedes triton. Courtship involved 'tapping' and 'jerking'. Males performed a ritualized 'wrapping' behaviour and 'fast-tapping'. During copulation, males inserted a single palp using the tibial apophysis to open the epigynum and guide the embolus. Males were capable of multiple matings, but females rarely mated more than once. Females rarely ate their mates, but after mating, became voracious feeders, attacking subsequent courting males. The reproductive output of females is affected by female size and food availability, particularly for larger females. Ten of eleven starved females failed to produce eggs. Mean egg weight and time to develop the first egg sac were not affected by food level or female size. It appears that smaller females may be at a selective advantage on ponds where food is limited, while larger females do best where food availability is high.

Between the sands and a hard place?: Aboriginal peoples and the oil sands

Author(s): Urquhart, I.

Year: 2010

Canada's aboriginal peoples are one of the constituencies most affected by the oil sands boom that has swept across northeastern North Alberta in western Canada since the mid-1990s. This paper considers reaction of these First Nations to exploring the oil sands. It argues that the conventional view of First Nations' positions is a caricature which pays insignificant attention to the important economic relationships that have developed between oil sands companies and some First Nations. These relationships mean that First Nations are both critics and supporters of exploiting this resources.

Biology and relationships of Pterostichus adstrictus Eschscholtz and Pterostichus pensylvanicus Leconte (Coleoptera : Carabidae)

Author(s): Goulet, H.

Year: 1971

Masters thesis. A comparison of two structurally similar species of beetles in relation to their ecological, behavioural, and morphological characteristics. Most of the data was obtained from the George Lake field station near Edmonton, Alberta.

Emporium of the north: Fort Chipewyan and the fur trade to 1835

Author(s): Parker, J. M. P.

Year: 1987

This study examines the establishment of the fur trade at Lake Athabasca, with Fort Chipewyan as its focus. It covers the period from the entry of Peter Pond in 1778, to 1835. By then, the fur trade had recovered from the damaging effects of the competition between the North West Company and the Hudson's Bay Company that preceded their amalgamation in 1821. The study portrays the life of a fort as it was related to the fur trade of a district. Fort Chipewyan, headquarters of both the North West Company's and Hudson's Bay Company's Athabasca enterprises, offers an opportunity to examine the fur trade under the differing conditions prior to and after 1821. Although documents are lacking for the North West period, there are sufficient records to indicate the conditions of the trade. Fort Chipewyan, the first European settlement in Alberta, was ideally situated for the fur trade, located as it is at the hub of a drainage system. The fort was reached from the south by the Athabasca River and the streams running to the north and to the west became highways for expansion of the trade. Lake Athabasca stretches to the east. As a base for extending the trade, Fort Chipewyan ranked second, surpassed only by Fort William on Lake Superior. It was not only the fur trade that benefited from the establishment of Fort Chipewyan, however, because as the "Grand Magazine of the North" it became the base of operations for land explorers. Alexander Mackenzie, John Franklin, George Back, and John Richardson were a few of the men who gained fame after passing through its gates.

Feedback interactions between forest tent caterpillars (Malacosoma disstria) and trembling aspen (Populus tremuloides) in central Alberta, Canada

Author(s): Durand, A.

Year: 2000

Positive and negative feedback interactions between forest tent caterpillars (Malacosoma disstria Hbn.) and trembling aspen (Populus tremuloides Michx.) may play an important role in the performance of this insect and perhaps even contribute to its cyclic population dynamics. Early spring larval feeding on opening buds did not induce strong rapid changes in the leaf quality of aspen; instead, some evidence for negative impact on caterpillar growth and development was found. Real and simulated insect defoliation in early summer (mid June) induced foliar changes in trembling aspen that had negative effects on larval performance. These changes were induced systemically throughout the tree and occurred a year following the damage. Significant interclonal variation in response to insect feeding damage was found, despite inherent clonal differences in leaf quality. Furthermore, true insect feeding appeared to elicit stronger induced defenses than mechanical wounding. This suggests that induced responses are indeed defensive. Whether or not they evolved as responses to herbivores in general or are co-evolutionarily linked specifically to M. disstria , remains to be determined.