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Articles 31 - 36 of 36
Full-Text Articles in Life Sciences
Spatial And Temporal Activity Of Migratory Bats At Landscape Features, Rachel M. Hamilton
Spatial And Temporal Activity Of Migratory Bats At Landscape Features, Rachel M. Hamilton
Electronic Thesis and Dissertation Repository
Geographical landmarks may be important features for navigation of migrating bats although spatial and temporal activity may depend on species-specific migration strategies. I predicted that latitudinal migrating bats would have higher activity along north-south oriented linear landscape features, especially during late-seasonal migration periods, compared to bat species that migrate within a regional area. I acoustically sampled four species of bats classified as latitudinal and regional migrants. I monitored twelve sites located in southwestern Ontario at four landscape features between May and October 2011. I found that specific landscape features may have greater importance to specific species rather than their migration …
Metals And Persistent Organic Pollutants As Ecological Determinants Of Human Health In Naivasha, Kenya, Chelsea R. Hicks
Metals And Persistent Organic Pollutants As Ecological Determinants Of Human Health In Naivasha, Kenya, Chelsea R. Hicks
Electronic Thesis and Dissertation Repository
The main industries in Naivasha are floriculture and geothermal energy, with both industries beginning in the 1980s. Increased employment caused a 20-fold increase in population over 3 decades. These changes have the potential to increase the release of environmental contaminants, such as metals and persistent organic pollutants (POPs). This study uses an ecosystem health approach to study the distribution and health risks associated with metals in airborne dust and POPs and metals in Cyprinus carpio dorsal muscle, in Naivasha, Kenya. Findings suggest that Ni in airborne dust may be derived from natural catchment substrate, but still exists at concentrations above …
Bats And The Landscape: The Influence Of Edge Effects And Forest Cover On Bat Activity, Meredith K. Jantzen
Bats And The Landscape: The Influence Of Edge Effects And Forest Cover On Bat Activity, Meredith K. Jantzen
Electronic Thesis and Dissertation Repository
The habitats in which bat species may most effectively forage are often determined by species-specific differences in wing morphology and echolocation call structure. Habitat edges are important for bat navigation and foraging, but no study to date has examined the depth of edge influence (DEI--the extent of quantifiable change in activity with distance from an edge) for bats. I predicted that DEI would vary with species-specific differences in wing structure and echolocation call characteristics. Additionally, because different habitats may be required to fulfill species’ foraging and roost requirements, I predicted that bat activity would be highest in areas with a …
Trace Metal Limitation And Its Role In Oxidative Stress Of Coral Algal Symbionts; Implications For Thermally Induced Coral Bleaching Events., Katrina Lynn Iglic
Trace Metal Limitation And Its Role In Oxidative Stress Of Coral Algal Symbionts; Implications For Thermally Induced Coral Bleaching Events., Katrina Lynn Iglic
Electronic Thesis and Dissertation Repository
Coral bleaching, the process in which corals expel their photosynthetic symbionts (Genus Symbiodinium), is caused by high temperature and irradiance stress. The synergistic effect of each stressor is the generation of damaging reactive oxygen and nitrogen species (ROS and RNS), which are normally mitigated physiologically by antioxidant enzyme activity. Antioxidant enzymes require iron, copper, manganese and zinc in their structure and the limited nature of these trace metals in reef environments may enhance ROS production under elevated temperature and irradiance. The hypothesis tested within this thesis was that a limited availability of the trace metals Fe, Mn, Cu and …
Extent, Characteristics And Downstream Effects Of Stream Enclosure In Southwestern Ontario, Katie L. Stammler
Extent, Characteristics And Downstream Effects Of Stream Enclosure In Southwestern Ontario, Katie L. Stammler
Electronic Thesis and Dissertation Repository
In a 16000 km2 area of southwestern Ontario, almost 15% of all streams have been enclosed (buried) largely for agricultural purposes. ArcGIS was used to characterize the natural features of catchments and to calculate enclosedness (proportion of stream network enclosed; x̅ = 16.5%, n = 10106). Catchments with the highest enclosedness received >990 mm of precipitation annually and had high drainage density (>1.9 km/km2), while catchments with the lowest enclosedness receivedannually, were characterized by clay and undrumlinized till plains and had relatively shallow water tables (m). These natural features influence where enclosure is likely to occur, …
Stopover Biology Of Migratory Landbirds In A Heavily Urbanized Landscape, The New York Metropolitan Area, Chad L. Seewagen
Stopover Biology Of Migratory Landbirds In A Heavily Urbanized Landscape, The New York Metropolitan Area, Chad L. Seewagen
Electronic Thesis and Dissertation Repository
Migration routes of many Nearctic-Neotropical landbirds pass through the most urbanized regions of North America. Migrants use urban habitat fragments as stopover sites and commonly occur in cities at exceptional density. Yet, knowledge of migrant stopover biology and refueling opportunities in such places is severely limited. This dissertation examined several aspects of migrant stopover biology in the New York metropolitan area to gain a more holistic understanding of how migratory landbirds utilize urban stopover sites, and ultimately to assess the quality of urban habitats as stopover sites. I first generated morphometric predictive models using salvaged bird specimens to allow me …