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.
Results
Showing 1 to 10 of 10 for “"grazing effects"”.
-
Snail grazing effects on the composition and metabolism of benthic diatom communities and subsequent effects on fish growth
… tanks were raked daily to a depth of 10 mm. Grazing by low densities of snails significantly increased chlorophyll standing stock, respiration and gross photosynthesis as measured by light and dark exchange of oxygen and carbon dioxide compared to untreated tanks. The standing stocks of algal …
-
Managing open habitats for species conservation : the role of wild ungulate grazing, small-scale disturbances, and scale
… test the suitability of wild megaherbivore grazing as a conservation tool to manage open habitats. We studied the effect of wild ungulates in a 160 ha game preserve in NE Germany in three successional stages (i) Corynephorus canescens-dominated grassland, (ii) ruderal tall forb vegetation …
-
Is commercial livestock farming environmentally viable within the Orange and Fish River catchment area (OFCA) of Southern Namibia?
… and the possibly that it is suffering from the effects of having farmed the OFCA veld into a state of durable suboptimal productivity remains to be conclusively established. This current study has been undertaken in order to investigate such a possible link, and to reach a more definite …
-
Interactive effects of fire and grazing on soil and forage nitrogen dynamics in a tallgrass prairie
… tallgrass prairie ecosystems, yet their combined effects on soil nitrogen (N) dynamics and links to forage quality across heterogeneous landscapes remain incompletely resolved. This thesis examined how fire frequency, grazing, and landscape position interact to regulate N cycling, N retention, and …
-
Large-scale forcing of coastal communities
… community structure, growth rates, predation and grazing pressures, effects of wave exposure, and stable isotope analysis. Individual species tended to vary between sites within lochs rather than between the two regions.<br/>Growth rates of the predator Nucella were found to follow peaks in …
-
Patterns of plant diversity and their management across South African Rangelands
… of diversity, forb recruitment and disturbance effects across the mesic to semi-arid rangelands east of the escarpment in southern Africa. Results were compared to a well studied North American tallgrass prairie, Konza. Sampled between 1 m2 and 1000 m2 across 25 sites, species and family …
-
Harvest Efficiency, Forage Trampling, and Litter Decomposition of Mob Grazing
High stocking density “mob” grazing is a recent phenomenon that is being promoted by a few practitioners, but has not undergone rigorous scientific testing. Producers have claimed “mob” grazing can generate many benefits in terms of forage production and overall grassland health. The objective of …
-
Developing new approaches for monitoring and controlling the toxic cyanobacterium Microcystis through flow-cytometric analysis
… states after exposure to particular stressors. A grazing experiment was carried out which examined the trophic interactions of a ciliate protist, Blepharisma americanum, against a toxic and non-toxic strain of Microcystis. B. americanum died in the presence of toxic Microcystis at the same rate as …
-
Movement and Mortality of White-tailed Deer in Southwest Minnesota
… Minnesota. BROWN 33. High stocking density “mob” grazing is a recent phenomenon that is being promoted by a few practitioners, but has not undergone rigorous scientific testing. Producers have claimed “mob” grazing can generate many benefits in terms of forage production and overall grassland …