Now showing items 1-10 of 17
Patterns and Processes of Species Diversity in Fragmented Northern Hardwood Forests.
(Toronto : University of Toronto, 2001)
Twenty-four upland hardwood forests were examined to determine the influence of plant dispersal and environmental heterogeneity on the composition and richness of species in the forest understory. Patterns in the dispersal ...
Goose-induced Changes in Vegetation and Land Cover between 1976 and 1997 in an Arctic Coastal Marsh
(Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, 2005)
Since the 1970s, a breeding colony of lesser snow geese (Chen caerulescens caerulescens L.) at La Pérouse Bay, Manitoba, has grown 8% annually. This increase has led to significant loss of plant cover in all major salt- ...
Soluble carbohydrate content of shoots of Arctic wetland plants that are consumed by lesser snow geese
(NRC Research Press, 2008)
We recorded seasonal changes in the total amounts of soluble carbohydrates in shoots of salt- and fresh-water coastal plants at La Pérouse Bay, northern Manitoba, to determine whether adult snow geese and their goslings ...
Nutrient Limitation of Plants and Soil Microbial Growth in an Arctic Coastal Salt Marsh.
(Ottawa : National Library of Canada = Bibliothèque nationale du Canada, 2005)
In order to assess the nutrient limitation of plants and soil microorganisms in the Arctic coastal salt marsh at La Pérouse Bay, Manitoba, a nitrogen (N) and phosphorus (P) fertilization experiment was conducted. The ...
Professor Bob Jefferies: A class act
(Varsity Science, 07/09/2009)
Soil microbial and nutrient dynamics in a wet Arctic sedge meadow in late winter and early spring
Microbial activity is known to continue during the winter months in cold alpine and Arctic soils often resulting in high microbial biomass. Complex soil nutrient dynamics characterize the transition when soil temperatures ...
Seed and vegetation dynamics in undamaged and degraded coastal habitats of the Hudson Bay lowlands.
(Ottawa : National Library of Canada = Bibliotheque nationale du Canada, 2000)
Grubbing and grazing by increasing numbers of lesser snow geese (Anser caerulescens caerulescens) have led to loss of vegetation and soil degradation in salt marshes and on beach ridges. These changes have had a deleterious ...
Allochthonous inputs: integrating population changes and food-web dynamics
Most ecosystems are recipients of allochthonous materials that enhance in situ productivity. Recent theoretical and empirical studies suggest that low to moderate inputs can stabilize food webs. However, depending on the ...
The allocation of inorganic nitrogen (15 NH4+) to soil, microbial and plant biomass in an Arctic salt marsh.
(Ottawa : National Library of Canada = Bibliothèque nationale du Canada, 2004)
This study has demonstrated, through the shared distribution of a single resource (15 NH4+), that plants and soil microbes compete for inorganic N in a N-limited system. At La Pérouse Bay, soil microorganisms out-compete ...
Obituaries - Robert L. Jefferies
(British Ecological Society, 2009-12)