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 20 for “"ecosystem engineer"”.
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The influence of an ecosystem engineer on nutrient subsidies and fish invasions in southwestern Montana
… the world's most highly valued yet threatened ecosystems. Interest in using the ecosystem engineering behavior of beaver tomeet watershed conservation goals is becoming more pervasive, owing to substantive work documenting the physical effects of beaver impoundments on freshwater ecosystems. …
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The influence of an ecosystem engineer on nutrient subsidies and fish invasions in southwestern Montana
… the world's most highly valued yet threatened ecosystems. Interest in using the ecosystem engineering behavior of beaver tomeet watershed conservation goals is becoming more pervasive, owing to substantive work documenting the physical effects of beaver impoundments on freshwater ecosystems. …
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Herbivory by Parma mccullochi (Pomacentridae) : its role as an ecosystem engineer in temperate algal-dominated reefs
… to determine the role of Parma mccullochi as an ecosystem engineer on temperate algal-dominated reefs in the metropolitan waters of Perth, Western Australia. To achieve this, the diet of P. mccullochi and any ontogenetic differences, and its impact on the reef in terms of algal composition and …
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Investigating the distribution of Nitellopsis obtusa in Ontario Lakes and its role as an ecosystem engineer
… since the 1970s, little is known about the ecosystem- and community-level impacts upon establishment. My thesis aimed to elucidate these potential effects by focusing on both within-lake and regional scale N. obtusa populations. I conducted a comprehensive investigation into ecosystem …
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Assessing the effects of trampling and bait-collecting on population, morphological and reproductive metrics of a key ecosystem engineer in Langebaan Lagoon
… bait collection and trampling, that compromise ecosystem resilience and functionality. Research on how human disturbance impacts keystone species, such as the endobenthic sandprawn Kraussilichirus kraussi, an important ecosystem engineer, has proven to be valuable and effective in monitoring …
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Long-term change in the invertebrates of Zandvlei Estuary, with focus on the invasive reef worm Ficopomatus enigmaticus
… enigmaticus and the role of F. enigmaticus as an ecosystem engineer.
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A damming history: an analysis on the legacy effects of beaver dams on the composition and structure of a montane riparian ecosystem
… widely recognized for its positive influence on ecosystem diversity and stability. As an "ecosystem engineer," the American beaver (Castor canadensis) increases heterogeneity in riparian systems through dam-building activities, resulting in diverse wetland complexes. This study explored the …
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Benthic metrics as indicators of human disturbance in a marine-dominated lagoon
… change, are negatively influencing coastal ecosystems. Because of their many benefits to mankind, it is important to identify key bioindicators that can detect disturbance-induced ecosystem change. Benthic metrics are an excellent example of disturbance indicators in soft sediment based …
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EFFECTS OF TIME, SEED SOURCE, AND PLANT COMPOSITION ON MACROINVERTEBRATES IN RESTORED PRAIRIE
… primary productivity and nutrient cycling in ecosystems. They are also important links between producer and higher trophic levels. Despite their important role in terrestrial ecosystem function, invertebrates are frequently overlooked in ecological restorations. Thus, the objective of this …
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Genetics and ecosystem effects of the invasive mussel Semimytilus algosus, on the West Coast of South Africa
… can radically affect community composition and ecosystem processes, and human traffic has accelerated their spread. On the South African coast, 86 invasive species have been recorded, although until recently only the Mediterranean mussel Mytilus galloprovincialis and the barnacle Balanus …
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Ecology and behaviour of burrowing prawns and their burrow symbionts
Ecosystem engineers play important roles as determinants of community dynamics by modulating resource availability for other species. Marine soft-sediment ecosystems are dominated by burrowing engineers which indirectly create biogenic structures that often attract other species, often leading to …
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Quantifying the effects of boat wakes on intertidal oyster reefs in a shallow estuary
… contribute greatly to conserving this important ecosystem engineer.
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Development of resource-rich patches by soil-disturbing animals in arid environments
… maintain or create habitat have been termed ecosystem engineers. One group of soil disturbing ecosystem engineers creates fertile patches by modifying soil microtopography through foraging for food and creating habitat. This thesis examines the effects of soil foraging animals on resource …
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THE EFFECTS OF LARGE HERBIVORES ON SMALL MAMMAL COMMUNITIES, PLANTS AND ECOSYSTEM PROCESSES IN NORTHERN ARIZONA
… that rely on those habitats, and the rates of ecosystem processes within those systems. These manifold impacts on systems are potentially magnifying, as removal of top predators and changes in land use have triggered large increases in large herbivore populations. Although increasing evidence …
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THE EFFECTS OF LARGE HERBIVORES ON SMALL MAMMAL COMMUNITIES, PLANTS AND ECOSYSTEM PROCESSES IN NORTHERN ARIZONA
… that rely on those habitats, and the rates of ecosystem processes within those systems. These manifold impacts on systems are potentially magnifying, as removal of top predators and changes in land use have triggered large increases in large herbivore populations. Although increasing evidence …
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Effects of burrowing sandprawns (Callichirus kraussi) on urban estuarine water quality
… (NBSs). NBSs use or mimic natural processes (ecosystem services) to improve water quality, for example microorganisms, plants and filter feeders have already been shown to mitigate eutrophication. However, burrowing endobenthic organisms have not yet been considered as a NBS, despite their …
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Ecosystem engineering: beaver and the population structure of Columbia spotted frogs in western Montana
… Stephen J. M.S., Autumn 2006 Wildlife Biology ECOSYSTEM ENGINEERING: BEAVER AND THE POPULATION STRUCTURE OF COLUMBIA SPOTTED FROGS IN WESTERN MONTANA Chairperson: Lisa Eby Beavers (Castor canadensis) are considered ecosystem engineers, altering hydrologic regimes, ecosystem processes, and …
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Ecosystem engineering: beaver and the population structure of Columbia spotted frogs in western Montana
… Stephen J. M.S., Autumn 2006 Wildlife Biology ECOSYSTEM ENGINEERING: BEAVER AND THE POPULATION STRUCTURE OF COLUMBIA SPOTTED FROGS IN WESTERN MONTANA Chairperson: Lisa Eby Beavers (Castor canadensis) are considered ecosystem engineers, altering hydrologic regimes, ecosystem processes, and …
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Predation On The Eastern Oyster Crassostrea Virginica On Intertidal Reefs Affected By Recreational Boating
Widely regarded as a keystone species and ecosystem engineer, the eastern oyster Crassostrea virginica plays a vital role in estuarine environments. Complex, three-dimensional oyster reefs act as havens for biodiversity and contribute to ecological processes. Recently, concern for this resource has …
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Experimental study of an avian cavity-nesting community: nest webs, nesting ecology, and interspecific interactions
… fire-maintained longleaf pine (Pinus palustris) ecosystem at Eglin Air Force Base, Florida. In chapter 1, I provide a background review of the ecology of my study system. In chapter 2, I use nest webs to depict the flow of cavity-creation and use at Eglin. I identified 2 webs into which most …