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 20 of 57 for “"Disturbance regimes"”.
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Modeling gap dynamics, succession, and disturbance regimes of mangrove forests
… Aside from these impacts, natural forest disturbances exist more commonly in mangroves compared to other forests as a direct consequence of their exposed coastal location. Within this thesis I investigate the influence of natural disturbance regimes on the mangrove forest dynamics focusing …
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Persistence potential of Great Basin high-elevation conifers under novel climates and disturbance regimes
Forest persistence under global change will depend upon the capacity of species to persist in situ by tolerating water and temperature stress, rapidly adjust to novel conditions or migrate to track ecological niches. Contemporary climate change outpaces the adaptive capacity of long-lived, …
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Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… is amplified in the northern high latitudes, and disturbance processes such as wildfire and thermo-erosion (i.e., ground subsidence transport of ice-rich sediments) have increased in frequency and magnitude in tundra ecoregions in recent decades. These novel disturbance regimes could increase the …
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Land snail species diversity and composition between different forest disturbance regimes in central and eastern Kentucky Forests
… land snails can be susceptible to anthropogenic disturbance and habitat fragmentation. Because of this, old-growth forests have the potential for being premiere habitat for these organisms, and snails have the potential to be good indicators of old-growth habitats. This study compared land snail …
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Identifying the effects of land use and policy on disturbance regimes in the Teanaway Community Forest, Washington
… to insect attacks. As a result, the current disturbance regime is significantly less frequent and of higher severity, posing risks to forest resilience by changing its fundamental structure. The purpose of this study is to understand how land use change has altered the structure and …
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Understanding pattern-process relationships in a heterogeneous landscape effects of large termitaria on diversity and disturbance regimes in Miombo woodlands of Northern Zimbabwe
… the face of herbivore impacts and fire (the two disturbances most amenable to management), research progressed in stages.
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The effects of habitat change on bird diversity and community structure in a mesic Savanna landscape
… or urban development in which natural disturbance regimes have been altered or limited. Managers of such areas often need to artificially maintain disturbance regimes in order to control ecosystem processes such as vegetation succession (Richards ef al. 1999). The relationship between …
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Impacts of multiple fires and wind disturbance on forest community composition, succession and diversity in the Boundary Waters Canoe Area Wilderness.
… expected to see an increase in the frequency of disturbances including wildfires and severe windstorms. While boreal forests such as those of the BWCAW are generally considered disturbance adapted, it is uncertain how changing disturbance regimes will impact these forests. We used a series 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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Future Forests of Bainbridge Island; Climate Change Vulnerability and Continuing Progressive Management
… increased tree mortality and modified forest disturbance regimes. Using GIS as a tool for spatial analysis, I identify probable physical vulnerabilities, then develop and apply a survey protocol to reveal canopy conditions and changes using a small Unmanned Aerial Vehicle (sUAV) drone and …
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Pattern and process in South Coast dune fynbos : population, community and landscape level studies
… to explain vegetation dynamics in response to disturbance in a dune landscape comprising a mosaic and admixture of grassland, fynbos and thicket. A hierarchical approach directed investigations at the landscape, community and population levels, with emphasis on seed banks. The study …
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Disturbance-based restoration for recovery of pitch pine (Pinus rigida) in the Thousand Islands Ecosystem: a comparison of prescribed fire and mechanical disturbance on seedling regeneration
Disturbance plays an important role in maintaining forests worldwide. Many natural disturbance regimes, especially wildfire, have been modified, which can lead to the loss of disturbance adapted forest communities. Pinus rigida (pitch pine) is strongly associated with wildfire in the core of its …
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Drivers of spatial and temporal variability in the fire regime of boreal forest in western Russia
… spatial and temporal variability in fire regimes occurs across this area that may not current be being encompassed in models and predictions of its future, particularly under a changing climate. This study has attempted to determine the relative controls on spatial and temporal variability …
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FOOD-WEB AND FUNCTIONAL TRAIT COMMUNITY STRUCTURE OF PREDATOR ASSEMBLAGES IN PINE FORESTS UNDER DIFFERENT MANAGEMENT REGIMES
<p>Anthropogenic activities can alter natural disturbance regimes in ecosystems, and thereby affect the structure and function of biological diversity. As many of the world’s ecosystems are degraded beyond natural recovery, well-defined restoration goals are necessary to maintain the ecological …
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Dynamics of two South African floodplain forests
… of the interaction of biodiversity patterns, disturbance regimes and environmental gradients therein. They stabilise migrating river channels and ameliorate hydrological extremes. Concern is growing over the degradation of riparian environments through upstream abstraction, impoundments, …
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Spatio-temporal patterns of forest disturbance in western North America: implications for forest resilience
Globally, forest disturbance activity is changing in response to changing climate. As disturbance regimes change, concerns have been raised that the mechanisms of forest resilience (i.e., the capacity of forests to tolerate disturbance) may begin to break down. To successfully monitor, forecast, …
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Space Use and Survival of White-Tailed Deer in a Disturbance-Driven System Containing a Restored Apex Predator
… including frequent pyrogenic and hydrological disturbances and the threat of predation. These forces affect their space use, behavior, and survival. Recent changes to the regional hydrology and increased abundances the Florida panther (Puma concolor coryi), their primary predator in this …
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Long-Term Disturbance Histories Of Managed And Natural Mixed-Hardwood Forests Of Central Indiana
… composition and structure related to changes in disturbance regimes. Reduced frequency and severity of disturbance events has allowed for the ingrowth of shade-tolerant, mesophytic species into forest understories; the result is shifting species compositions and changes in forest structure. In …
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Wildfires for resilience in California’s Sierra Nevada: fine-scale assessment at regional scales with airborne lidar
… the impacts of climate change and shifting disturbance regimes particularly severe. Fire played a vital ecological role in maintaining the resilience and adaptive capacity of dry forest ecosystems historically. As managers work to conserve dry forest landscapes in the 21st century, it is …
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