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 28 for “"forest succession"”.
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Soil Heterogeneity Changes During Forest Succession: Test of a Model Using Univariate and Geostatistics
We sampled forest stands in upland forests of the Southeastern US along a chronosequence of a replicated successional forest sere (1, 6, 10, 25, and 80 years) to elucidate the temporal changes in soil spatial heterogeneity. Samples were collected from loblolly pine plantations representing …
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Changes in landscape patterns and associated forest succession on the western slope of the Rocky Mountains, Colorado
… changes in major vegetation types (coniferous forest, aspen forest, rangelands) on the western slope of the Rocky Mountains, Colorado, U.S.A. The photographs span a period of 80 to 110 years, thus representing a century of change since the large mining-related disturbances associated with …
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EFFECTS OF FOREST SUCCESSION ON RAM'S HEAD LADY'S SLIPPER (CYPRIPEDIUM ARIETINUM) POPULATIONS IN THE GRAND SABLE DUNES, MI
… plots declined by 42% (n=366). I mapped forest cover expansion at GSD using historical aerial photography (1939-2022) to analyze the effects of forest age on ram’s head densities and distribution. Orchid densities declined the most in the oldest and largest forest islands that established …
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Vegetation Community Changes in Two National Forests in the Pineywoods, East Texas
<p>Despite extensive research into forest succession, little research has been directed to long-term studies. The fundamental properties of succession remain unclear and further research into terrestrial vegetation and an accounting of drivers in specific ecosystem types is required. This study …
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The effects of forest disturbance on stream stability
… stability of stream ecosystems in response to forest disturbance and subsequent succession. Stability was defined as the ability of streams to retain particulate organic matter and nutrients during storms. I hypothesized that forest streams are least stable during the intermediate stages of …
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Habitat Use by Boreal Mammals in Response to Salvage Logging After an Insect Outbreak
… logging) is controversial, as it may disrupt forest succession and alter wildlife habitat. I examined habitat use by moose (Alces americanus), snowshoe hares (Lepus americanus), lynx (Lynx canadensis), coyotes (Canis latrans), and little brown bats (Myotis lucifugus) in response to salvage …
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WHITE SPRUCE (PICEA GLAUCA), MOOSE (ALCES ALCES) AND THE ORIGIN OF A ZOOTIC DISCLIMAX COMMUNITY ON ISLE ROYALE
… combined with canopy loss alters trajectories of forest succession, and in extreme cases may produce novel landscapes dominated by the groundcover layer. I investigated the response of woody species to savannas which have emerged in Isle Royale National Park as a result of moose herbivory. I used …
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Environmental determinism and forest structure and composition: a naturally replicated experiment
Ecological theory states that forest succession is largely environmentally determined. Many investigators have suggested, however, that stochastic processes can frequently alter successional pathways. In particular, the colonization phase is thought to be very stochastic. This study utilizes a …
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The development of a spatial explicit agent-based modelling framework to explore past vegetation dynamics
… used for contemporary woodlands, primarily forest succession models, these are applied to prehistoric landscapes with change determined by human management, climate change and landscape features. Key concepts of computer modelling and their effects on both the implementation and …
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Using dendrochronology to identify species-specific ice storm damage in Delaware
Ice storms are recurrent disturbances that alter forest succession and retard tree growth rates throughout North America. Following a 1994 ice storm in Delaware, the Delaware Forest Service established seventy-five study plots to sample four species of trees (southern red oak [Quercus falcate ], …
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Ice storms as a disturbance factor in Appalachian oak forests
… natural disturbances in eastern deciduous forests. Two opposing hypotheses exist in the literature regarding the effect of glaze on forest succession. In the first view, succession is said to be accelerated as pioneer species sustain greater damage than equilibrium species. The resistant …
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The Role of Breeding Habitat Loss in the Decline of Eastern Whip-Poor-Will (Antrostomus Vociferus) Populations in Canada
… the loss of useable open habitat (e.g., forest clear-cuts, old fields) within 1140 m of Breeding Bird Survey stops predicted the declines in Whip-poor-wills at the same stops. The loss of useable open habitat at stops was primarily caused by forest succession of clear-cuts and old fields; …
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Landscape Influences on Spatial Patterns of White-tailed Deer Herbivory and Condition Indices in the Central Appalachian Mountains
… have had an increasingly negative effect on forest biodiversity and a growing influence on forest succession. In Virginia, the combination of these factors has prompted establishment of deer population management goals and policies designed to support conservation of biodiversity, forest …
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Spatial and temporal dynamics of fire and vegetation change in Thunder Creek watershed, North Cascades National Park, Washington
… Cascades National Park to evaluate past fire and forest vegetation dynamics. The first study evaluated forest development following a series of fires c. 150 years ago. Tree species, age and size data were sampled along altitudinal transects. Tree species distributions and relationships with …
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Flood Processes, Forest Dynamics, and Disturbance In the Congaree River Floodplain, South Carolina
… impacts. This study was designed to examine the forest development dynamics in abandoned meander landforms on the Congaree River floodplain, South Carolina in order to gain a better understanding of the forest successional responses to environmental gradients and historic logging …
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WHAT PREDICTS TERRESTRIAL INVERTEBRATE SUBSIDY USE BY BROOK TROUT (SALVELINUS FONTINALIS) IN HEADWATER STREAMS?
… of terrestrial invertebrates, I predicted that forest succession stage would be especially important due to differences in terrestrial invertebrate biomass in early and late successional habitats. To test this prediction, I measured terrestrial invertebrate biomass, input to streams, and use by …
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WHAT PREDICTS TERRESTRIAL INVERTEBRATE SUBSIDY USE BY BROOK TROUT (SALVELINUS FONTINALIS) IN HEADWATER STREAMS?
… of terrestrial invertebrates, I predicted that forest succession stage would be especially important due to differences in terrestrial invertebrate biomass in early and late successional habitats. To test this prediction, I measured terrestrial invertebrate biomass, input to streams, and use by …
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Swamp ecology in a dynamic coastal landscape: an investigation through field study and simulation modeling
… I then developed a two-species individual-based forest succession model (IBM) of a coastal swamp. The IBM followed the weekly growth, mortality, and reproduction of individuals of Taxodium distichum and Nyssa aquatica trees in a 1-km2 spatial grid, using historical time-series of stage and …
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Understanding Forest Landscape Response to Global Climatic Change: An Uncertainty Evaluation Based on Spatial Modeling
The forest ecosystem is one of the world's most important ecosystems that would be substantially affected by future global climatic changes in temperature, CO2, precipitation and radiation. Climatic changes may affect tree species physiology, abundance, distribution; forest community …
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