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.
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Showing 1 to 10 of 10 for “"Disturbance Gradient"”.
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Diversity, Invasibility, and Stability of Appalachian Forests across an Experimental Disturbance Gradient
… communities in Appalachian forests responded to disturbances caused by forest management activities. I had two primary objectives including (1) testing theories of biological diversity and invasions by nonnative species; and (2) providing empirical data that will help guide the sustainable use of …
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Effects of Forest Regeneration Methods on Salamander Populations in Central Appalachia
… were lower in silvicultural treatments with some disturbance to the canopy (group selection harvest through silvicultural clearcut). Further, a comparison of demography of common species of salamanders suggested that differences in habitat quality existed between harvested and unharvested …
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Forest Net Primary Production Resistance Across a Gradient of Moderate Disturbance
The global carbon (C) balance is vulnerable to disturbances that alter terrestrial C uptake and loss. Moderate disturbances that kill or defoliate only a subset of canopy trees such as insect defoliation, drought, and age-related senescence are increasing in extent and frequency; yet, little is …
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Soil Microbial Diversity and Litter Decomposition Increase with Time Since Land Use Disturbance in Tropical Montane Forests of Malaysian Borneo
… in the tropical forests of Southeast Asia. These disturbances alter soil chemistry, microbial diversity, and disrupt carbon cycling through shifts in litter decomposition. Direct links between microbial diversity and soil properties such as pH are well established; however, the indirect impacts of …
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Assessing the effects of ecosystem disturbance on two insect vectors of pine wilt disease in the southern Rocky Mountains
Ecosystem disturbances such as wildfire and bark beetle outbreak may structure the dynamics of forest tree diseases by altering vector behavior and population dynamics. As climate change intensifies, disturbances are increasing in both severity and intensity; however not all disturbance types have …
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Using benthic microalgae as an indicator of recreational disturbance associated with bait collection and trampling in Langebaan Lagoon, South Africa
… its effectiveness in quantifying the effects of disturbance by humans (in the form of bait collecting and trampling) and using intertidal benthic microalgae as an indicator. Specifically, the instrument was used in Zone A of Langebaan Lagoon, which is an area that permits recreational activities …
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Assessing the effects of trampling and bait-collecting on population, morphological and reproductive metrics of a key ecosystem engineer in Langebaan Lagoon
… they are vulnerable to multiple human-related disturbances such as intense bait collection and trampling, that compromise ecosystem resilience and functionality. Research on how human disturbance impacts keystone species, such as the endobenthic sandprawn Kraussilichirus kraussi, an important …
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Quantifying changes in macroinvertebrate community composition, biomass, and emergence in response to mining-induced salinization in central Appalachian streams
… and energy in response to a salinization gradient, we added them as additional metrics. Macroinvertebrates may have varied responses to a stressor dependent upon life stage, suggesting that assessments relying only on immatures may not fully characterize the effects of salinization. We …
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Responses of the Ocellated Turkey (Meleagris ocellata) to Human Disturbance
… Chapter Two describes the association of habitat disturbance with male movement patterns and select indicators of health. There were no significant differences in home range size, blood and fecal parasites, feather barring regularity, male fleshy ornaments, and H:L ratios among the disturbance …
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Vegetation-Based Metrics Of Biotic Integrity For Assessing The Ecological Condition Of Wetlands Of Kentucky
… world has significantly declined due to human disturbances. It has been estimated that Kentucky has lost over 80% of its wetland area. In response to these losses occurring across the United States, the Clean Water Act was passed to halt this dramatic decline and to restore the ecological …