The vegetation of the high mountain grasslands of the north-eastern Transvaal was sampled by using stratification based on geology and land types. Data was classified by TWINSPAN procedures and refined by using the Braun··Bianquet method. This resulted in the recognition of three vegetation units namely wetlands, boulderies and grasslands which represent a moisture gradient. Wetlands comprised four major communities and ten minor plant communities while boulderies resulted in four major communities and seven minor communities. The grasslands comprised four major plant communities which were subdivided into twenty eight minor communities. All identified communities were described and ecologically interpreted and a species list was compiled combining the data gathered in the area by other authors. / Dissertation (MSc)--University of Pretoria, 2013. / Plant Science / unrestricted

Prescribed burning was utilized as a management tool on grasslands of the Northern Great Plains. We analyzed the use of fire to manipulate encroaching and unpalatable western snowberry (Symphoricarpos occidentalis), to promote browsing and improve nutritive quality. Fire was successful at altering the nutrient quality of western snowberry and selectivity of grazing livestock from plant specific to patch specific. Additionally, we evaluated the difference between burn season and frequency on plant community dynamics of an ungrazed tallgrass prairie invaded by Kentucky bluegrass (Poa pratensis). Fire promoted native forb and grass species, stressing that native species are well adapted to the historical disturbance. Our research emphasizes the need for restored fire regimes in the Northern Great Plains to benefit numerous aspects of prairie ecosystem function, stability, services, and productivity. / U.S. Forest Service / Central Grasslands Research and Extension Center

There has been a widespread assessment of the capacity of grasslands to restore after several forms of disturbance. In South Africa forestry is a significant habitat disturbance within the Eastern Highveld grasslands where this study was conducted. The study compared ant communities between disturbed grasslands that have been rehabilitated after pine forestry and undisturbed grasslands. Ant sampling was conducted using pitfall traps within rehabilitated sites of age 10 years to 40 years and undisturbed grassland sites. We expected that exposure to pine plantations would result in remarkable differences in ant species richness, assemblages and abundance. A total of 17 genera and 31 morphospecies were collected; 25 species within the rehabilitated and 22 species from the undisturbed grasslands. The sites did not show any significant differences in their species richness, although they had distinctive species assemblages. Ant diversity showed recovery with increasing age after pine with older sites (38 years and 40 years) showing higher diversity compared to the younger sites especially the 10 year old site. Copyright / Dissertation (MSc (Environmental Ecology))--University of Pretoria, 2011. / Zoology and Entomology / Unrestricted

The restoration of degraded tallgrass prairies can mitigate climate change due to the carbon accrued during the development of grasslands. The focal species, dominant grass Andropogon gerardii, can assist the recovery of grassland ecosystem functioning. Climate, local adaptation, and biodiversity have been found to impact the accrual of carbon in grasslands. This study examined the difference in ecosystem functioning between ecotypes along a dry to mesic precipitation scale. The study site for this project was at the Southern Illinois University Agriculture Research Center in Carbondale, Illinois. The field site was planted with seeds originating from dry to mesic ecotypes, and the resulting ecosystem functioning was analyzed. It was found that the Kansas non-local ecotypes had significantly higher biodiversity, while the local Illinois sites demonstrated local adaptation with A. gerardii. Aboveground plant biomass was higher in the local sites, but there was no difference in carbon accrual between any of the ecotypes. While ecotypic variation in a dominant species will usually differentially influence ecosystem functioning, in this case, high biodiversity and local adaptation result in similar carbon inputs in grassland soil. It is necessary to analyze the carbon content of the soil in the drier field sites in order to determine if major differences in rainfall leads to differences in carbon accrual. If the goal of restoring a tallgrass prairie in southern Illinois is to assist with climate change mitigation, then it does not make a significant difference if the dominant species is sourced locally or non-locally.

The Melanoplus scudderi species group, when erected by Blatchley, contained six species. The revision of the group presented here describes 21 new species and establishes the Melanoplus carnegiei group, all of which are associated with grasslands in the Southeast. Analysis of DNA barcoding data, suggest that the technique does not adequately delineate species based on the morphological concepts presented here, but did produce three broad mitochondrial DNA clades that correspond to the Apalachicola and Mississippi River discontinuity phylogeographic pattern displayed by several other organisms in the Southeastern United States. This pattern is attributed to vicariant events resulting from Pleistocene glaciation. A hypothetical evolutionary history of the Scudderi and Carnegiei groups is presented. Natural grasslands historically covered a significant portion of the southeastern United States. These grasslands contribute significantly to the biodiversity of the region with many endemic or rare species inhabiting them. Grasshoppers are important components of temperate grassland ecosystems, but no comprehensive review of the grasshopper fauna of southeastern grasslands had previously been conducted. Here a review of the regional fauna was conducted. In total, 211 grasshopper species have been documented in the Southeast, with 111 species (53%) being endemic to natural grasslands. Of particular note, 74 species (34% of the regional fauna) are endemic to the longleaf pine ecosystem. Many of the non-endemic grasshopper species inhabiting grasslands in the region are disjunct from larger populations west of the Mississippi River, presenting interesting biogeographic distributions. Additionally, a cluster analysis of grasshopper community composition from several types of grasslands in the region supports the faunal distinctiveness of the different types grasslands in the region.

North American grassland bird populations are declining more rapidly than other groups of birds. A well-established method of quantifying and monitoring grassland bird populations is by locating active nests. Active nests are often difficult to locate in grassland swards due to the varying heights within the canopy that nests are established. Studies quantifying grassland bird populations have low statistical power due to low sample sizes and high disturbance. Advances in small, unmanned aerial systems and thermographic imaging technologies have potential to improve efficiency of locating nests throughout canopies. This study explored detection accuracy of using thermal imagery to identify simulated grassland bird nests located at different heights within monoculture tall-stature grass canopies. This methodology was tested in blind evaluations, using multiple evaluators. Results from this study suggest that surveying thermal images is a reliable method for detecting active nests at depths of up to 1 m into a grass canopy.

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A dissertation submitted to the faculty of Science, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Master of Science. / Unable to load abstract.

In the years 2005 - 2006 it was practised typological maping of selected meadow and pasture areas in Kardašova Řečice (439 m n.m.). The selected areas of permanent grasslands were separated into parts by growth types, where it was observed: projective dominance and frequency of individual species, the amount of primary production of biomass, the underground water level.

A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy / The study aimed to differentiate the effect of rainfall and grazing on the compositional change of savanna grasslands, and to explain responses in terms of the life history patterns of the main species, An extinction prone perennial grass under heiry grazing was identified as a palatable, obligate seed reproducer with low seed production and poor dispersal (e.g. Themeda triandra and Reteropogon contortus), wnich could become extinct if the established population and the seed bank were eliminated. Aristrida species were expected to show the converse pattern. Grazing was manipulated for three or five years, and rainfall for one year, on a sandveld site, and two clay soil sites which supported the same species in different amounts, respectively. (Abbreviation abstract) / Andrew Chakane 2019