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 11 of 11 for “"litter cover"”.
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The effect of native forest dynamics upon the arrangements of species in oak forests-analysis of heterogeneity effects at the example of epigeal arthropods
… structures (i. vegetation, ii. dead wood. iii. litter cover). The spider were collected in a block design by pitfall traps (n=72) in a 4-week interval. To reveal key environmental factors affecting the spider distribution abiotic and biotic habitat parameters (e.g. vegetation parameters, climate …
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Nest predation and habitat selection in the grasshopper sparrow (Ammodramus savannarum)
… predation by mammals and snakes increased with litter cover and fescue (Schedonorus phoenix) surrounding the nest. Mammals were less likely to prey upon nests with increased forb cover as well. Nest losses attributed to cowbirds (Molothrus ater) were unrelated to measured habitat or landscape …
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Ecology of the Eastern Cottonmouth (<i>Agkistrodon p. piscivorus</i>) at Back Bay National Wildlife Refuge: A Comparative Study of Natural and Anthropogenic Marsh Habitats
… live vegetation served as the primary cover object for these snakes. The majority of captures were male snakes, and few gravid females were captured in either marsh in either year. Many snakes fled before capture. Snakes fled in the direction opposite the investigator no matter which …
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Effects of prescribed fire timing on vigor of sericea lespedeza in the Kansas Flint Hills
… SL stem length, SL seed production, soil cover, and plant species composition were measured along single, permanent 100-m transects in each burn unit. Treatment and measurement date influenced forage biomass and SL stem length (treatment × time). Forage biomass was not different (P ≥ 0.43) …
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Spatial and temporal variation In greenhouse gas flux as affected by mowing on grasslands of hummocky terrain In Saskatchewan
… with soil water, topography, percentage litter cover and GHG flux rate. Overall, the Mixedgrass Prairie of Saskatchewan likely contributes very little to GHGs. Properly managed, the Mixedgrass Prairie has a well-balanced nutrient cycle that includes various GHGs. The grassland ecosystem …
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Grassland bird associations in a managed agricultural matrix
… with nearby (30 m) rowcrop area, grass cover, and horizontal vegetation cover. Red-winged Blackbird nest success was highest in diverse filter strips (23.4%) than on average (8.6%) and positively correlated with nest height, but negatively correlated with litter cover. I attached radio …
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Use of Natural Vegetative Barriers to Limit Black-Tailed Prairie Dog Town Expansion in Western South Dakota
… included visual obstruction (VOR), vegetation cover (%), vegetation frequency, vegetation height, and vegetation identification. Burrow density adjacent to buffers was quantified as an index to prairie dog population. Barrier penetration was evaluated by presence of new active burrows behind …
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The influence of soil fertility and light intensity on field layer development in urban secondary woodlands
… in both field experiments by removing 50% canopy cover from varied canopy starting points (i.e. simple monospecific vs. multi-layered mixed). All introduced species grew well across the full range of soil conditions in the experimental programme. Soil fertility was a major determinant of field …
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Avian assemblages and Red-eyed Vireo nest survival within mineland forest
… and a predominance of aggressive groundcovers that inhibit native species colonization. Under these conditions, succession is arrested. Within landscapes that are fragmented by traditionally reclaimed surface mines, forest patches are smaller and forest cover on the landscape scale is …
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Effects of Amur Honeysuckle (Lonicera maackii [Rupr.] Herder) Invasion and Removal on Native Vegetation and White-Footed Mice (Peromyscus leucopus) in Mixed-Hardwood Forests of Indiana
… we examined the influence of density, percent cover, and duration of Amur honeysuckle (i.e., time since establishment), as well as other environmental factors, on native plant taxa. Overall, study sites with the highest taxonomic diversity (H‘), richness (S), percent covers, and densities of …
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Measuring grassland response to management using optical remote sensing
Grassland ecosystems cover a large portion of the Earth surface and have similar economic and ecological values as croplands and forest ecosystems. To sustainably provide ecosystem services through grasslands, grassland management bridges the connection between the provision of grassland services …