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 33 for “"exclosure"”.
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Trapped? Evidence of changes in relative plant abundance after long-term grazing exclosure across the Tundra.
… that most groups showed no changes after the exclosure period suggesting that gazing cessation does not necessarily impact the abundance of all growth form groups.
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The Effect of Area on Resource Competition among Migrant Birds at a Stopover Site
… Spring 2007 and Spring 2008. I set up netted exclosure pairs to examine the relationship among fragment size, bird density and resource abundance. I found that in Fall 2007 and Spring 2008, the density of migrant birds was higher in smaller fragments. In all three field seasons, the density of …
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Stable isotope analysis as an indicator of tree and grass rooting depth in a mesic African savanna
This exclosure-based study in a mesic southern African savanna investigated the validity of the Walter Hypothesis, which states that trees and grasses root at different depths and subsequently exploit different soil moisture layers. Root samples were extracted from vertical soil profiles in open …
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Impact of large mammal herbivory on the federally threatened plant, Scutellaria montana chapm (large-flowered skullcap) at a millitary training site, Catoosa County, Georgia
… mammal herbivores on this species at the VTS, an exclosure experiment was conducted in the field during 2011 and 2012. Results indicate that deer are not negatively impacting S. montana at the individual or population levels, but and after the second season, it was apparent that the white PVC pipe …
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Influence of Predation on Least Tern and Piping Plover Productivity Along the Missouri River in South Dakota
… in 1991 - 1992 using chick escape shelters, exclosure cages, and strobe lights as passive deterrent devices. Piping plover nest success was significantly increased (P < 0.001) with the use of exclosure cages. Piping plover and least tern nest success and chick survival appeared to be enhanced …
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Crayfish: Scavenger or deadly predator? Examining a potential predator-prey relationship between crayfish and benthic fish in aquatic food webs
… densities of both taxa and using enclosure/exclosure experiments. Data obtained from sampling Illinois streams showed that increased crayfish density correlates with decreased fish density, and this relationship is more pronounced in sites that have established populations of invasive …
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Effect of Macrograzers (Campostoma spp. and Faxonius spp.) on Periphyton in Ozark Streams with Considerations Given to Macrograzer Biomass, Phosphorus, and Season: Mensurative and Manipulative Studies
… manipulated macrograzer presence with electrical exclosures in streams to examine macrograzer effects on algal biomass and understand whether these effects on periphyton varied with total phosphorus (TP) or season. Macrograzer density was quantified across a TP gradient (n=15 streams; range = …
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Effects of Grazing by Feral Horses on Dune and Salt Marsh Vegetation at Cumberland Island, Georgia
… and were greatest in the north.</p> <p>Foredune exclosure analyses revealed that vegetation cover is significantly reduced where horses selectively graze the important stabilizing species, <em>U</em>. <em>paniculata</em>. Though the interdune varied between exclosure site locations, grazing …
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Flamingo foraging activity as a driver of spatial heterogeneity in Langebaan Lagoon, South Africa
… on macrofaunal communities with the aid of exclosure experiments. However, no attention has been paid to the possible impacts of different foraging methods used by flamingos on benthic communities. Multivariate and univariate analyses were carried out in order to determine the effects of two …
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Red fox ecology and interactions with piping plovers on Fire Island, New York
… selection, and responses to piping plover nest exclosure setup, pre-hatch pipping, and hatching. We used fecal dietary analyses and data from den prey item surveys to quantify the frequency of piping plover predation and to identify major prey items of red foxes on the island. Red fox occupancy …
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Small mammal pollination in Protea Witzenbergiana
… trapping, during and after the flowering season. Exclosure experiments were set up in order to assess seed set. Mammal droppings were collected, processed and pollen grains were counted. All small mammal species excepting one (Otomys irroratus) contained pollen grains in their faeces. Oendromus …
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Evaluation of Barriers to Black-Tailed Prairie Dog (Cynomys ludovicianus) Colony Expansion, Bad River Ranches, South Dakota
… with chicken wire, American bison (Bison bison) exclosures, and straw bales. Barriers were 100 meters (328 ft) in length and located within 1 hectare monitoring plots (2.47 ac). Grazing and mechanical mowing were allowed on both sides of barriers. A prairie dog free zone was established on …
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Management and Livestock Performance of Alfalfa-Tall Fescue Mixed Stands
… Management treatments conducted within wire exclosures included defoliation height, rest period, exclosure movement, and month and were evaluated using detailed botanical composition and persistence measurements. Defoliation height, rest period, and month all affected alfalfa-tall fescue …
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THE RELATIONSHIP BETWEEN WOODLAND CARIBOU, SOIL CARBON CYCLING AND SOIL FERTILITY ON THE SLATE ISLANDS ARCHIPELAGO IN ONTARIO, CANADA
… and snowshoe hare (<em>Lepus americanus</em>) exclosures on the islands in 2006, and have routinely monitored the vegetation to study the effects of limiting herbivory.</p> <p>This study explores the implications of limiting herbivory on soil fertility, carbon and nitrogen stocks, and …
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An Examination of Puccinia Mariae-Wilsoni Infection of Claytonia Virginica
… are needed to spread the spores were addressed. Exclosure treatments in 2008 yielded significant differences between the ant-pollinator exclusion (APE) treatment and the pollinator exclusion (PE) and soil spore exclusion(SSE) treatments. In 2009, treatments again showed differences between the …
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Community Structure of Parasitoids Attacking Leaf Galls of Belonocnema treatae on Quercus fusiformis
… The objectives were addressed using an exclosure study which limited access of parasitoids to leaf galls to a series of discrete 30 day window of opportunity. Following B. treatae oviposition (April) but before initiation of gall development, exclosure bags were placed on 210 branches …
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Methods for Rapid Screening in Woody Plant Herbicide Development
… of seedlings) can be achieved relative to field exclosure screenings. Rapid screening methods including, greenhouse seedling screening, germinal screening, and seed screening were performed using triclopyr and 8 experimental herbicides supplied by Dow AgroSciences (DAS). Five woody species were …
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The response of dune vegetation to human trampling and grazing
… both exposed to rabbit grazing and within an exclosure. An interactive plot design allowed the contemporaneous examination of nutrient addition to these treatments. Multivariate analysis indicated that grazing and trampling each produced distinct changes in species composition. The balance of …
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Effects of Ponderosa Pine Ecological Restoration on Forest Soils and Understory Vegetation in Northern Arizona
… twelve years after tree thinning and grazing exclosure treatments were applied. Several measured soil properties, such as soil respiration and temperature, were also evaluated in this study. Species richness of “cool-season” vegetation was influenced more by grazing practices than restoration …
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Assessing the effects of invasive Ligustrum sinense and Lonicera japonica on rare and federally threatened Scutellaria montana
… in Chattanooga, TN. An interacting herbivory exclosure treatment was included to help isolate the effects of competition from non-insect herbivory, another possible pressure negatively influencing S. montana, and to isolate the effects of competition from apparent competition. I hypothesized …
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