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 “"Waterbird"”.
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Influence of Human Recreational Activities and Vegetative Characteristics on Waterbird Abundance
… may influence the occurrence and abundance of waterbirds. I investigated the possible impacts of recreational activity and vegetative characteristics on the relative abundance of waterbirds along a heavily used river, the San Marcos River, in central Texas. The abundance of waterbirds and human …
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Assessing conservation of a tropical African estuary : waterbird disturbance, livelihoods, and ecotourism
… was achieved by assessing the vulnerability of waterbirds to disturbance from human activity in the estuary, the current use and importance of the area to local livelihoods, and the value (current and potential) of tourism. Waterbird densities and levels of human activity were quantified from 20 …
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Estimating Forage Production for Waterbirds and Waterbird Response to Habitat Management at Lacreek National Wildlife Refuge, South Dakota
Resource managers are often required to estimate waterfowl forage production on management units in order to meet habitat management goals. A technique was developed in Missouri to quickly estimate seed yields of common moist-soil plants consumed by a variety of waterfowl species by measuring …
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Using state-space time series analysis on wetland bird species to formulate effective bioindicators in the Barberspan wetland
The Coordinated Waterbird Count dataset (CWAC) is a dataset containing waterbird counts from wetlands across South Africa, going as far back as 1970. These data contain valuable information on population sizes and their trends over time. This information could be used more widely if it was more …
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Biogeography and ecology of African waterbirds
… of distribution and diversity for African waterbirds are investigated at the continental, sub-continental, ecosystem and species levels. The focal species is the Great White Pelican Pelecanus onocrotalus, one of South Africa's 'Red Data' bird species. The 'focal' ecosystem is Rondevlei Bird …
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Factors Driving Recreational Disturbance of Waterbirds on the Texas Coast
… can also negatively impact species populations. Waterbirds are most sensitive to human disturbance because of the delicate nature of coastal habitats, which waterbirds rely on. This dissertation addresses the decline in waterbird populations and efforts to reduce their disturbance in three ways. …
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The effects of recreational activities on aquatic avifauna
… and is the principal wetland for breeding waterbird numbers in the south-western Cape Province. It is an important collection, pairing and distribution centre prior to the breeding season. Emerging mudflats during evaporation in late summer are a major gathering point for waders before …
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The role of waterbirds in the dispersal of aquatic organisms in southern Africa
… very recently has the capacity of highly mobile waterbirds to disperse aquatic organisms received similar attention in the dispersal literature. Dispersal is important for the organisation of communities, and therefore understanding the frequency and scale of waterbird-mediated dispersal provides …
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Assessing the conservation value of wetlands and waterbirds with a focus on the winter rainfall region of South Africa
… significance of wetland avifauna. Termed the Waterbird Conservation Value (WCV) score, this method sums the proportion of each species' count relative to the global 1% threshold level for each species; the value obtained measures the overall conservation importance of the wetland to waterbirds.
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Working with large-scale population trend data in ecology and conservation: methods and applications
… population trend datasets, 749 species of waterbirds, at 45,475 sites across the world, I develop methods to improve inferences from popula- tion trends, explore methods to combat data dredging and combine my findings to conduct the largest ever robust assessment of protected area …
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Nutritional Value and Management of Waterfowl and Shorebird Foods in Atlantic Coastal Moist-Soil Impoundments
… moist-soil impoundments that are managed for waterbirds. Positive relationships between nonbreeding body condition and subsequent survival and reproduction have been documented for waterfowl, yet few evaluations of habitat management consider nutritional value of foods. I assessed 2 types of …
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Phylogeography And Habitat Associations Of Franklin's Gulls In Their United States Breeding Range
… and in the Northern Prairie and Parkland Waterbird Plan for the U.S. and Canada. The designation of this status is due to few, isolated breeding colonies and unknown population dynamics. Few attempts have been made to address the unknown population dynamics or to quantify habitat use at …
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Quantifying Shoebill (Balaeniceps rex) habitat suitability in the Bangweulu Wetlands, Zambia
… for the Shoebill (Balaeniceps rex), a large waterbird confined to African swamps, was conducted by using a combination of aerial photographs and a previously determined habitat suitability model from the Bangweulu Wetlands, Zambia. The Shoebill is considered Vulnerable on the IUCN red list, …
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Using eDNA to construct community assemblages of amphibians at sites infected with Batrachochytrium salamandrivorans in the Netherlands.
… to confirm this finding. Potential amphibian or waterbird vectors of Bsal are explored and future avenues for research are discussed. This research provides the foundation for future studies on Bsal and its relationship with amphibian communities and helps inform researchers on correct primer …
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Ecological effects of water hyacinth (Eichhornia crassipes) on Lake Chapala, Mexico
… effect on aquatic invertebrates, fish, and waterbirds is less predictable and dependent on conditions prior to invasion. In chapter 2, I tested for relationships between percent water hyacinth cover and waterbird abundance, species diversity, community composition, and habitat use. In …
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Aspects of the ecology of migrant shorebirds (Aves: Charadrii) at the Berg River estuary, South Africa
The waterbird populations of the Berg River estuary, South Africa, were studied from September 1987 to April 1989. The main objectives of the study were to assess the importance of the estuary for Palearctic-breeding migratory waders and to identify the factors affecting their distribution, …
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A multi-scale study on the movement ecology of Afrotropical waterbirds
… which to formulate informed conservation plans. Waterbirds in semiarid southern Africa are an ideal study group for understanding interactions between movement and environmental factors because they exhibit a wide range of movement strategies and are located within a landscape in which resources …
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QUANTIFYING DISTURBANCE FACTORS AND EFFECTS IN COMMON TERNS (STERNA HIRUNDO) USING VISUAL, AUDIO, AND REPRODUCTIVE DATA
… Lake, which is habitat to many other colonial waterbird species and an area of high human use during the tern breeding season. In addition to disturbances caused by recreational use, Oneida Lake's common terns are exposed to potential disturbances from tern research and cormorant management. …
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Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
The Reddish Egret (Egretta rufescens) is a rare species of heron due to its limited geographic range as well as its narrow habitat requirement, relying exclusively on coastal tidal flats throughout its yearly cycle. It is therefore vulnerable to stressors ranging from human coastal development to …