Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"landscape effects"”.
-
Landscape effects on bumble bee (Hymenoptera: Apidae) colony performance and fitness in New York State
… are limiting to their survival and growth at the landscape scale. Our study examined the performance of the common eastern bumble bee, Bombus impatiens (Cresson), in four common landscapes (natural, suburban, conventional agriculture, and organic agriculture). In the summers of 2016 and 2017, 64 …
-
Is organic beekeeping possible? A multi-year study of pesticide contamination and landscape effects in the Northeast US
… Understanding how organic management and landscape factors affect contamination in hive products is essential for developing feasible standards.Methods: We conducted two related studies on certified organic farms in New York, Pennsylvania, and West Virginia. First, we compared pesticide …
-
Understanding pattern-process relationships in a heterogeneous landscape effects of large termitaria on diversity and disturbance regimes in Miombo woodlands of Northern Zimbabwe
Spatial heterogeneity has been shown to influence ecosystem processes and important ecosystem properties like resilience and biodiversity, allowing species with specific habitat needs or weaker competitive abilities to persist in disturbed systems that might otherwise have excluded them. Miombo …
-
Examining the Influence of Landscape on Natural Resource Management in the American West: A Geospatial Approach
Landscapes can influence natural resource values and management in a variety of ways. These diverse influences can be generated by biophysical or social systems, or interactions between systems. This dissertation examines the landscape determinants of natural resource values and management. Chapter …
-
Bat occupancy of forests and managed savanna and woodland in the Missouri Ozark Region
… site occupancy models that included habitat and landscape effects. The probability of detecting bat species with acoustic detectors varied by species and was related to temperature, relative humidity, barometric pressure, tree density, Julian date, distance to water, and visit. Generally, higher …
-
Puma Dispersal Ecology in the Central Rocky Mountains
… gap exists in our knowledge of the influence landscape heterogeneity has on dispersal and its consequences. We examined landscape effects on dispersal and its consequences for puma (Puma concolor) populations using data from three separate populations in the Central Rocky Mountains including …
-
Puma Dispersal Ecology in the Central Rocky Mountains
… gap exists in our knowledge of the influence landscape heterogeneity has on dispersal and its consequences. We examined landscape effects on dispersal and its consequences for puma (Puma concolor) populations using data from three separate populations in the Central Rocky Mountains including …
-
The effects of wildflower plots and diverse landscapes on ecosystem services, bee communities, and on-farm tick abundance
… disease vectors. In this study, we evaluated the effects of natural habit and wildflower plots on biological control, pollination services, bee communities, and tick populations in Eastern Virginia and Maryland. This research was conducted on 22 farms. 10 of these farms had wildflower plots that …
-
Assessing the relationships between pollinator-friendly plantings and birds, bats and white-tailed deer on farms in the Coastal Plain of Virginia and Maryland
… species out of 110 species detected on farms, landscape-level cover types were influential in 14 species and presence of pollinator plots was influential for 5 species. After stratification of density estimates by control and pollinator farm study sites, we found that during Spring surveys, the …
-
The Importance of Multiple Study Areas in Landscape Genetics: The American Black Bear in the Rocky Mountains
… their distribution. I used individual-based landscape genetics analyses in 12 study areas in western Montana and northern Idaho to assess the influence of landscape features on gene flow among American black bears (Ursus americanus). I compared the influence of landscape features among the …
-
The Importance of Multiple Study Areas in Landscape Genetics: The American Black Bear in the Rocky Mountains
… their distribution. I used individual-based landscape genetics analyses in 12 study areas in western Montana and northern Idaho to assess the influence of landscape features on gene flow among American black bears (Ursus americanus). I compared the influence of landscape features among the …
-
Challenges of regional hydrological modelling in the Elbe River basin : investigations about model fidelity on sub-catchment level
… an independent view on the evapotranspiration landscape. The overall insight is that spatially explicit hydrological modelling of such a large river basin requires a lot of local knowledge. It probably needs more time to obtain such knowledge as is usually provided for hydrological modelling …
-
Dialect formation in fragmented populations of the endangered North Island kokako (Callaeas wilsoni)
… of song cultures, social divergence and landscape effects on conservation from a behavioural perspective. Song sharing and comparisons of acoustic characteristics were used to reconstruct associations of song traditions and acoustic traits at both macrogeographic and microgeographic …