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 15 of 15 for “"Overharvesting"”.
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Assessing species richness patterns and conservation threats (due to overharvesting and climate change) in South African Cycads, with emphasis on a population of Encephalartos tranvenosus Stapf and Burt Davy from the Soutpansberg Mountain, Limpopo Province
Cycads are regarded as the oldest living seed plants on earth and they have existed for about 300 million years. Ever since the awareness of the existence of this plant group, they have been facing high extinction risk. Currently they are referred to as the most threatened plant group in the world. …
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Regenerative Aquaculture: Designing for Resilience of the Chesapeake Tidewater
… is out of balance. As the effects of decades of overharvesting, overdevelopment, and pollution have taken their toll, tidewater communities are confronted with a loss of culture, livelihood, and the environment in which they live. This thesis seeks to reframe the problem of regeneration of …
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Income and harvest effects of alternative management policies on commercial crab potters in Virginia
… This fact, along with growing concerns of overharvesting and uncertainty about the amount of effort in the fishery, has led to calls for more complete data on the fishery. This study examined the characteristics of Virginia's blue crab fishery, through an extensive survey of crab pot …
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Movement and habitat use of lake sturgeon (Acipenser fulvescens) in the South Saskatchewan River system
… numbers throughout their range due to historical overharvesting and more recent habitat degradation. Fragmentation and disruption caused by large dams on the rivers they inhabit have greatly impacted this species. Lake Sturgeon in Alberta are part of an Endangered population as defined by the …
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Impacts of Vegetation Density and Distance from the High Tide Line on Raccoon Predation of Diamondback Terrapin Nests in Jamaica Bay, NY – A preliminary study
… at least the nineteenth century. However, due to overharvesting, this became a species of conservation concern. While extensive data are available to describe its natural history, some conditions that impact nest predation are poorly understood. In this exploratory study, vegetation type and …
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Willingness to Pay for Alternative Programs to Improve Water Quality in the Chesapeake Bay
… Bay has been plagued by pollution, disease and overharvesting of its resources. As a result, the Bay has been the focus of substantial research and the beneficiary of numerous environmental programs. Previous work has suggested that people are willing to pay for improved water quality in the …
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Exploring challenges and intervention strategies for harvesting Mopane worms in conservation areas: A case study of selected areas in Vhembe District Municipality
… for the communities dependent on them. The overharvesting of Mopane worms without adequate ecosystem protection led to environmental unsustainability. This study highlighted the need for conservation areas to adopt alternative pest control methods and avoid deforestation to protect Mopane …
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A proteomic investigation of the immune response of the South African abalone, Haliotis midae
… fishery. However, the combined effects of overharvesting, increased illegal catches and negative environmental factors led to a collapse in wild populations in the mid-90s. Consequently, land-based aquaculture of H. midae has grown significantly in South Africa, to satisfy the global demand …
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Can we get there from here? Ecosystem based governance in the Bay of Fundy/Gulf of Maine region
… development, climate change, habitat loss, overharvesting, chemical pollution, nutrient overloading, and invasive species invasions show no sign of abating. Traditional methods of managing the human activities that impact the Bay of Fundy/Gulf of Maine are proving unable to keep pace with …
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Evaluation of Mineral Use in Bighorn Sheep (Ovis canadensis)
… to their decline. These factors include overharvesting, habitat loss, competition with domestic livestock, and disease (Buechner 1960). Conservation of the bighorn sheep is a major concern of wildlife managers throughout North America. The three species of bighorn sheep in North America …
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Identification and Genetic Diversity of Lake Sturgeon Larvae on Artificial Reefs in the Huron-Erie Corridor
… Changes to water and habitat quality, along with overharvesting, have caused declines to nearly 1% of their original population size. The Huron-Erie Corridor (HEC), includes the St. Clair and Detroit rivers that connect the upper and lower Great Lakes. This area in particular has experienced …
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Characterizing African Elephant (<i>Loxodonta Africana</i>) Population Dynamics and Distribution in Botswana
… from 2019 to 2020, suggesting no evidence that overharvesting impacted the elephant population age structure in northern Botswana. Range expansion has also been identified with the movement of the elephant population into the southern part of the country by 2012. Analysis of count and …
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Interaction between grazing by starfish (parvulastra exigua) and nutrient enrichment on intertidal soft-sediment communities.
… community being affected. Today, the pervasive overharvesting of important consumers and increased nutrient loading in coastal natural habitats are globally recognised as factors requiring urgent attention. Such activities can significantly modify the interaction between top-down and bottom-up …
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Interaction between grazing by starfish (parvulastra exigua) and nutrient enrichment on intertidal soft-sediment communities.
… community being affected. Today, the pervasive overharvesting of important consumers and increased nutrient loading in coastal natural habitats are globally recognised as factors requiring urgent attention. Such activities can significantly modify the interaction between top-down and bottom-up …
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Understanding changes in mangrove forests and the implications to community livelihood and resource management in Kenya
… and climate change was a lower concern. Although overharvesting of wood resources was identified as a common threat, coping strategies for this threat differ along the coast. While some counties are using an alternative source of wood, others are switching to alternative methods of construction …