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 63 for “"Forest Biology"”.
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Effects of non-commercial thinning on Great Horned Owls on Turnbull National Wildlife Refuge
<p>To sustain forest health, increase species diversity and reduce wildfire events in the ponderosa pine (Pinus ponderosa) forests of at Turnbull National Wildlife Refuge (TNWR) managers have implemented a variety of approaches including prescribed burning and non-commercial thinning. The impacts …
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Grassland and Woodland Bird Occurrence and Habitat Selection in the Prairie-Forest Transition Zone of Minnesota
… Minnesota in the transition zone between forested and prairie ecoregions. Little information is available relative to which birds are using grassland or woodland habitat within the WMD and how their presence or absence is related to the available habitat conditions. Therefore, my study …
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Identification of Fossil Wood from the Specimen Creek Area of the Gallatin Petrified Forest, Yellowstone National Park, Montana
<p>The petrified fossil forests in the Specimen Creek area of Gallatin Petrified Forest contain spectacular petrified tree stumps, trunks and logs in horizontal and vertical positions. These fossils forests are embedded in early middle Eocene volcaniclastic rocks and piled in sequential layers.</p> …
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Beaver moderated fire resistance in the North Cascades and potential for climate change adaptation
<p>Climate change and fire suppression have altered historic fire regimes, creating conditions for larger, more intense fires. Intense burns can alter watershed hydrology, increasing the potential for harmful channel incision, which impairs riparian ecosystem function by lowering the water table, …
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The Regeneration Niche in Bottomland Hardwood Forests: Tree and Herbaceous Communities Along Interacting Gradients of Flood and Light in East Texas Floodplains
… demonstrated that small canopy gaps in BLH forest support shade-tolerant tree seedlings and increase understory plant diversity, but suppress shade-intolerant hardwoods such as oaks and hickories. A complementary greenhouse study demonstrated that two oak species exhibited similar responses …
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Restoration through reassembly: evaluating the role of native plants in combatting Chinese tallow
<p>Non-native, invasive species disrupt ecological processes and functions, posing a serious threat to natural ecosystems. By examining the growth metrics of the non-native, invasive tree, Chinese tallow (<em>Triadica sebifera</em> [L.] Roxb.), hereafter tallow, across different flooding and light …
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Phylogenetic Analyses of Andean and Amazonian Tree Communities in Ecuador
<p>The forests of Ecuador are known for their high levels of diversity and endemism, classifying the country as a biodiversity hotspot. Both the western Amazon and Andean montane forests are richly populated with tropical tree species that have been little studied in a community phylogenetic …
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Vegetation Responses to Prescribed Burning in a Mixed-conifer Woodland, Cuyamaca Rancho State Park, California
<p>This study reports the results of light intensity prescribed burning on the vegetation of 3 jeffrey pine-black oak woodland sites in Cuyamaca Rancho State Park, California. The 1.2 ha, 85 ha, and 6 ha burn plots were measured for tree and shrub density and basal area 6 months, 1% years, and 2 …
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Evaluation of Red Alder Mortality in the Little Creek Watershed Following the 2009 Lockheed Fire
<p>Five hundred eighty red alder along a 2.16 km portion of the Little Creek riparian zone were assessed for mortality following the 2009 Lockheed Fire near Davenport, California. The study area was divided into burn severity zones and every red alder within the riparian zone was observed and …
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HABITAT USE BY SPRUCE GROUSE IN A FRAGMENTED SYSTEM
… on the Yellow Dog Plains at the levels of forest patch, and point of presence. I used vegetation cover and composition metrics, as well as measures of patch connectivity, size and complexity to predict presence of spruce grouse. Patch level habitat use by spruce grouse on the Yellow Dog …
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Soil community structure and litter decomposition under irrigated Eucalyptus Globulus in South Western Australia
Plantations provide a range of benefits, including the potential to ameliorate salinity and soil erosion, enhance biodiversity, and provide timber and wood chips. They are increasingly important because of their role in carbon sequestration (Adolphson, 2000; Anonymous, 2005; Jones et al. , 2005; …
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AN ANALYSIS OF LOBLOLLY PINE AND SHORTLEAF PINE HYBRIDIZATION USING CHROMATOGRAPHY AND GEOGRAPHIC INFORMATION SYSTEMS: A CASE STUDY IN EAST TEXAS
<p>East Texas forests contain three native pine species known to hybridize when site conditions are suitable. Due to increased gene flow from hybridization, quantifying hybridization spatially is a growing concern as southeastern United States pine forests are increasingly influenced by improved …
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AVIAN FORAGING RESPONSE TO JACK PINE (PINUS BANKSIANA) VOLATILE CHEMICALS
… in the jack pine (<em>Pinus banksiana</em>) forests in the Upper Peninsula of Michigan. I measured VOCs released from trees that were favored by foraging insectivorous and omnivorous birds and compared them to VOC measurements from trees that had no avian foraging. Specifically, I focused on …
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Occurrence and Characteristics of Nonfruiting Myxobacteria Isolated from Pine Forest Soils
… of nonfruiting myxobacteria isolated from pine forest soil Three years after a prescribed burn, the population of nonfruiting myxobacteria was decreased in the burn site. The organisms isolated were distinct from any of the known species of nonfruiting myxobacteria, and apparently are new …
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Assessing Organic Matter Breakdown and Associated Macroinvertebrate Community Structure in Headwater Streams: Effects of Hydrologic Gradients and Upland Timber Harvesting
I examined the effects of hydrologic gradients and upland timber harvesting with different streamside management zone widths on yellow-poplar (<i>Liriodendron tulipifera</i>) processing and the associated macroinvertebrate community structure in the Cumberland Plateau ecophysic region, U.S.A. Prior …
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Effects of Prescribed Fire Regimes on White-tailed Deer (Odocoileus virginianus) Browse, Forage, and Nutrient Availability in the Pineywoods Ecoregion of Texas
<p>Fire is a management tool for white-tailed deer (<em>Odocoileus virginianus</em>) habitat, influencing browse availability, herbaceous production, and nutrient content. In 2020 and 2021, this study utilized 46 plots across East Texas to assess these habitat components. A stem count index survey …
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