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 37 for “"Snags"”.
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Aquatic Macroinvertebrate Production in Predominant Habitats of a Warmwater Stream: The James River, South Dakota
… for macroinvertebrate colonization were sampled: snags (fallen trees and woody debris), rock (areas of stony substrata), and mud (areas lacking instream features with streambeds consisting of fine unconsolidated sediments). Sampling stations were established in areas where instream habitat was …
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Biology and conservation of the endangered Bahama Swallow (Tachycineta cyaneoviridis)
… southern Abaco, especially near roads and pine snags. Future research should prioritize identifying the causes of variable and low population densities in parts of the swallow's range. I used microsatellite markers and morphometrics to assess differences between populations on Abaco and Andros. …
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Experimental study of an avian cavity-nesting community: nest webs, nesting ecology, and interspecific interactions
… bird community at Eglin. Large, mature pine snags were abundant, exceeding other reported densities for southern pine forests. Pine snags were heavily-used, despite the abundance of available red-cockaded woodpecker cavities in living pine. Hardwood snags accounted for 10% of nests found, and …
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Habitat use and demography of red-headed woodpeckers in west-central Illinois
… by greater abundance of large trees, snags, and dead limbs. Nest survival varied little among sites, but appeared to be greater for higher cavities, nests located in floodplain forest, and at nest sites surrounded by relatively little shrub cover. My results suggest that red-headed …
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Submerged wood inhabiting macoinvertebrates of the Elm Fork of the Trinity River, Texas: Assemblage analyses, comparisons to the benthic fauna, and a study of Cyrnellus fraternus (Trichoptera: Polycentropodidae)
… variability of macroinvertebrates inhabiting snags were examined from an 8-km segment of the Elm Fork of the Trinity River. Seventy-seven macroinvertebrate taxa were collected from submerged wood during the study. Assemblages were highly variable spatially and temporally, especially among …
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Differences in Fish Abundance Among Habitat Types in a Warmwater Stream; The James River, South Dakota
… (areas of gravel or rubble substrate), snags (woody debris), low-head dams and rock-crossings, and tributary confluences. River reaches lacking instream features (i.e. physically simple habitats) served as references. Fish were sampled with double-wing trap nets and beach seines from May …
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NEST SITE CHARACTERISTICS OF LEWIS’S WOODPECKER (MELANERPES LEWIS) IN RIPARIAN SYSTEMS OF WESTERN MONTANA
… showed that Lewis’s Woodpeckers used larger snags in areas with relatively high percent shrub cover and relatively high snag density per hectare. Snags provide perches to forage from, cavities for nesting, and an open canopy, while the shrub understory supports arthropod prey. From a …
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NEST SITE CHARACTERISTICS OF LEWIS’S WOODPECKER (MELANERPES LEWIS) IN RIPARIAN SYSTEMS OF WESTERN MONTANA
… showed that Lewis’s Woodpeckers used larger snags in areas with relatively high percent shrub cover and relatively high snag density per hectare. Snags provide perches to forage from, cavities for nesting, and an open canopy, while the shrub understory supports arthropod prey. From a …
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Conditions in architecture
… spectral light above the last purity of snow-snags. There-west-were the Tetons. Snow peaks would soon be In dark profile to break constellations. Beyond what height Hands now the black spec? Beyond what range will gold eyes see New ranges rise to mark a last scrawl of light? Or, having tasted …
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Woodpecker Nesting Habitat in a Prairie River Woodland
… (Salix amygdaloides) in vigorous stands and elm snags in areas with a mixture of live and dead trees, but avoided snap-dominated stands.</p>
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Effects of Mid-Rotation Release on Forest Structure, Wildlife Habitat, and Pine Yield
… reductions in canopy hardwoods and increases in snags. Reduced shrub stratum density resulted in a lower bobwhite quail (Colinus virginianus L.) cover index on imazapyr-released areas.
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Identifying structural differences in mixed mesophytic and northern hardwood forests on the Monongahela National Forest using remote sensing data
… by greater numbers of larger trees, snags, log accumulations, and canopy gaps, compared to 50--69 year old stands. The 70--89 stands were more similar in structural characteristics to the stands >90 years old than to the 50--69 year stands.;Texture analysis, single band, and …
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The Development Of Old-Growth Structural Characteristics In Second-Growth Forests Of The Cumberland Plateau, Kentucky, U.s.a.
… suggested minimum densities for old-growth for snags > 30 cm DBH, though old forest had almost three times that of young forest, and nearly approached values reported for old-growth forest. Young and old forest also exhibited different patterns in oak and maple dynamics. Understory maples and …
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Assessing and evaluating the Forest Stewardship Program: promoting and conducting sound wildlife management
… use objectives. Creating and/or managing snags, creating edge, developing food plots, and establishing mast producing species were recommended most often. A second questionnaire was sent to 300 randomly chosen Virginia FSP participants (1991 - 1993) (response rate 81.3%) who declared …
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Successive Land Surveys as Indicators of Vegetation Change in an Agricultural Landscape
… corners recorded tree species, shrubs, stumps, snags and non vegetative markers. Types of witness corners were tallied and tested for shifts in frequency across time periods. Tree species were also classified by silvical characteristics including sprouting capability, shade tolerance, and seed …
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Age, forest structure, and disturbance history of five potential old-growth forests in eastern Kentucky's Cumberland Plateau
… is similar to average OG density, volume of CWD, snags and pre-European trees/ha. A change in establishment environment during the mid-1800's suggests AH might have been selectively logged. Gladie Creek (GC) and Natural Bridge (NB) exhibit disturbance during the 1890's likely the result of human …
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Habitat use by fishes of the New River, West Virginia
… slow velocities (deep edge and middle pool, and snags), while young centrarchids preferred shallower habitat. However, all sizes of smallmouth bass were nearly ubiquitous in the habitats of the study area. The cyprinids and percis preferred shallow areas, but preferences for velocity differed …
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Movements and home range size of bald eagles from Glacier Bay National Park and Preserve, Alaska: with an analysis of satellite telemetry
… perched more often in conifers than cottonwoods, snags, or intertidal debris (£ < 0.001). Perch types selected (£ = 0.473), as well as eagle activity (£ = 0.126) were not significantly different during the breeding and non-breeding seasons. Fifty-eight percent of radio-ma~ked adult eagles used …
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Population Characteristics and Habitat Selection of Channel Catfish (Ictalurus punctatus) in the Lower James River, South Dakota
… used complex structural cover types (large snags and rock darns} significantly more (Chi-square=48.83, df=4, P=0.0001) than their availability. Channel catfish used depths between 1.1 and 2.0 m significantly more (Chi-square=58.95, df=6, P=0.0001) than their availability. Channel catfish …
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