Dissertations / Theses on the topic 'Impact on Wetlands'
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Shelton, Michael. "Comparison of GPS Point Selection Methods for GIS Area Measurement of Small Jurisdictional Wetlands." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2831/.
Full textLohnes, Karen Lynn. "Impact of reconstructed wetlands on the tree swallow (Tachycineta bicolor)." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3563.
Full textThesis research directed by: Dept. of Animal and Avian Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Orosz-Coghlan, Patricia Anne. "Impact of Wildlife on Escherichia coli in a Constructed Wetland." Thesis, The University of Arizona, 2001. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0015_m_sip1_w.pdf&type=application/pdf.
Full textQiu, Song. "Impact of drying on nutrient transformations and water quality in wetlands." Thesis, Qiu, Song (1995) Impact of drying on nutrient transformations and water quality in wetlands. PhD thesis, Murdoch University, 1995. https://researchrepository.murdoch.edu.au/id/eprint/51185/.
Full textBanning, Alison E. "The effect of long piers on birds using tidal wetlands in Worcester County, Maryland." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 56 p, 2007. http://proquest.umi.com/pqdweb?did=1338866001&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textHerrera-Pantoja, Marina. "The impact of climate change on groundwater-fed wetlands in East Anglia." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445530.
Full textSpeks, Amanda. "Analyzing the impact of the financial systems for constructing wetlands in Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445062.
Full textSjöblom, Åsa. "Wetlands as a means to reduce the environmental impact of mine drainage waters." Doctoral thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4708.
Full textSjöblom, Åsa. "Wetlands as a means to reduce the environmental impact of mine drainage waters /." Linköping : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4708.
Full textAllagas, Philip. "Assessing the Impact of Restored Wetlands on Bat Foraging Activity Over Nearby Farmland." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/etd/3804.
Full textAllagas, Philip. "Assessing the Impact of Restored Wetlands on Bat Foraging Activity Over Nearby Farmland." Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etd/3804.
Full textFONSECA, Cláudia Adriana Bueno da. "Tipologia e fragmentação das terras úmidas do cerrado na alta bacia do Rio Araguaia, estado de Goiás." Universidade Federal de Goiás, 2010. http://repositorio.bc.ufg.br/tede/handle/tde/1847.
Full textThe aim of this research is to call the attention to the humid areas preservation for they are natural habitat with special dynamic and genesis and that they have been damaged by the gradual development of the use of the soil in the latest year. The upper basin of Araguaia river were chosen as an area study to follow systematically the development of Cerrado habitat degradation; going deeply in that approach we want to show how important those humid areas are for its complexity to maintain the biodiversity. According to the environment point of view those wets areas are complex ecosystems, situated in the water interface and in the soil, and has had an important paper in the hydrologic and dynamic and also to keep the biodiversity. The sub basins of Babilonia and Piranhas rivers of the Araguaia river were selected to develop a gradual typology of the humid soil and the development of degradation they are. The present research used thematic bases in a schedule of 1:100.000, 1:250.000 and 1:500.000 of geology, geomorphology, soil, vegetation and upper basins hydrographic to characterize the landscape natural mosaic and the choice of the two studied sub basins. To delimitate the humid areas of the selected sub basins areas pictures where taken (1965) and satellite images LANDSAT MSS and TM(1975 and 2008) to get the impact diagnostic from the cattle raising and agriculture activities in the wetlands. Among the identified typology of wets lands of this context to the researched sub basins we detach riparian forest and humid field. The analysis of the continuous environment degradations of the wetlands was developed by a geoprocessing with the use of softwares ENVI 4.3; SPRING 4.3; the ecology metric pasture were analyzed developing FRAGSTATS 3.3; and ArcGis program (Geography Information System) to elaborate crossing data, areas calculation and to finish thematic maps. The reached result shows that in 1965 year the dominant wet land typology in the Piranhas river sub basins is the riparian forest while in Babilonia river sub basin there had a proportion as those ones among the typology showed in the riparian forest and humid field. In 2008 year the environment degradation in the sub basins wets area happened in a different way. In Babilonia river sub basins there had a decrease of the wets lands typology of 56,89%. The riparian forest lost space for the raising cattle and agriculture activities, pasture and urban areas that are taken 17,43%, 7,30% and 0,08% of the wetlands of that sub basins. Humid field showed a decrease of 20,79% for the raising cattle and agriculture activity and for pasture 11,30%, while in the Piranhas river sub basins the wets lands were reduced in 60,52% because the growing cattle raising and agriculture activities (the former one occupied 57,21%, the later one 1,56% and the urban area 0,15%). The humid field typology suffered a decrease in its area for the agriculture and raising cattle activities in 1,39% and 0,21% respectively. Unfortunately we can conclude that the wets areas of Babilonia and Piranhas rivers sub basins have been strongly degraded for those activities in the last 30 years. We should ask for public politics and appropriate techniques to diminish the environment impacts in those areas. The adoption of public politics and rights and proper techniques are necessary to diminish the impact in those important environment areas. The global vegetation has been the primary source of oxygen in the atmosphere enabling aerobic metabolism system to evolve and persist. That is one more reason to the urgency of a careful and serious public politics to keep wetlands untouched.
A Alta Bacia do rio Araguaia no sudoeste goiano foi escolhida como área de pesquisa, para avaliar de forma sistemática a tipologia e fragmentação das terras úmidas em ambiente de Cerrado. Do ponto de vista ambiental, as áreas úmidas são ecossistemas complexos, situadas na interface água e solo, tendo um papel fundamental na dinâmica hidrológica e na manutenção da biodiversidade. Essa pesquisa teve como meta chamar a atenção para preservação das áreas úmidas, em função destas constituírem ambientes naturais com gênese e dinâmicas particulares que estão sendo impactados pela evolução do uso e ocupação do solo, ocorridas nos últimos anos. No âmbito da área da Alta Bacia do rio Araguaia, foram selecionadas as sub-bacias dos rios Babilônia e Piranhas para avaliação da tipologia de terras úmidas e o estado de degradação ao qual estão submetidas. A presente pesquisa utilizou bases temáticas em escala 1:100.000, 1:250.000 e 1:500.000 de geologia, geomorfologia, solos, vegetação e hidrografia da Alta Bacia para caracterização do mosaico de paisagens naturais e escolha das duas sub-bacias estudadas. Para a delimitação das áreas úmidas nas sub-bacias selecionadas utilizou fotografias aéreas (1965) e imagens de satélites LANDSAT MSS e TM (1975 e 2008) para efetuar diagnósticos dos impactos gerados pela atividade agropecuária em terras úmidas. Dentre as tipologias identificadas no contexto das terras úmidas para as sub-bacias pesquisadas se destacaram a Floresta Ciliar e o Campo Úmido. A análise da fragmentação das terras úmidas foi realizada por Geoprocessamento com uso dos softwares ENVI 4.3; SPRING 4.3; as métricas da ecologia da paisagem foram analisadas utilizando o programa FRAGSTATS 3.3; e o ArcGis 9.2 (S.I.G.- Sistema de Informações Geográficas) para a elaboração, cruzamento de dados, cálculo de áreas e finalização dos mapas temáticos. Os resultados obtidos indicam que, em 1965 a tipologia dominante na sub-bacia do rio Piranhas é a Floresta Ciliar, enquanto na sub-bacia do rio Babilônia havia uma proporção em área quase equivalente entre distribuição das tipologias da Floresta Ciliar e Campo Úmido. Em 2008, a fragmentação em áreas úmidas nas duas sub-bacias ocorreu de forma diferenciada. Na sub-bacia do rio Babilônia houve uma redução das tipologias de terras úmidas de 56,89%. A tipologia Floresta Ciliar perdeu espaço para a agricultura, pastagem e área urbana, as quais passaram a ocupar 17,43%, 7,30% e 0,08% das terras úmidas desta sub-bacia. O Campo Úmido teve uma redução de 20,79% devido a sua substituição pela agricultura e de 11,30% devido sua substituição por pastagem. Enquanto, na sub-bacia do rio Piranhas as áreas úmidas sofreram redução de 60,52% em função das atividades agropecuárias (agricultura ocupou 57,21%, pecuária 1,56% e áreas urbanas 0,15%). A tipologia Campo Úmido tiveram suas áreas reduzidas em função da agricultura e pecuária com substituição de 1,39% e 0,21% respectivamente. Conclui-se que as áreas úmidas das sub-bacias dos rios Babilônia e Piranhas têm sido fortemente degradadas por atividades agropecuárias nos últimos 30 anos, portanto, a adoção de políticas públicas e técnicas de conservação apropriadas são necessárias para diminuir os impactos ambientais nessas áreas.
Fu, Jing. "Environmental Impacts of Aquaculture Ponds on Coastal Wetlands in the Yellow River Estuary." Kyoto University, 2017. http://hdl.handle.net/2433/225949.
Full textMattson, Crystal L. "Impact of wastewater reuse in Burlington County on surface water quality and adjacent wetlands /." Full text available online, 2006. http://www.lib.rowan.edu/find/theses.
Full textEhbair, Abdassalam. "Trihalomethane formation in drinking water : impact of drought, treatment wetlands and methods of analysis." Thesis, Bangor University, 2017. https://research.bangor.ac.uk/portal/en/theses/trihalomethane-formation-in-drinking-water-impact-of-drought-treatment-wetlands-and-methods-of-analysis(9c9289d8-cc6d-409b-8463-9e5aba236de7).html.
Full textMedlock, Jolyon Matthew. "Impact of the creation, expansion and management of English wetlands on mosquitoes (Diptera: Culicidae)." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.686169.
Full textGreen, Jeffrey. "Impact of pre-ozonation on distillery effluent degradation in a constructed wetland system." Thesis, Link to the Internet, 2007. http://hdl.handle.net/10019/631.
Full textMoloto, Makoma Johanna. "The quality of environmental impact reports for projects with the potential of affecting wetlands / Makoma Johannah Moloto." Thesis, North-West University, 2005. http://hdl.handle.net/10394/952.
Full textThesis (M. Environmental Management)--North-West University, Potchefstroom Campus, 2006.
King, Christian King. "The impact of surrounding anthropogenic land-use on morphological characteristics and plant diversity in wetlands throughout Ohio." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543248579203378.
Full textAtkinson, Sean Thomas. "The impact of a climate dryness on multiscale biodiversity of freshwater macroinvertebrates in wetlands on a salinized landscape." Thesis, Atkinson, Sean Thomas (2019) The impact of a climate dryness on multiscale biodiversity of freshwater macroinvertebrates in wetlands on a salinized landscape. Honours thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/51566/.
Full textBrown, Alex. "Wetlands and drylands in prehistory : Mesolithic to Bronze Age human activity and impact in the Servern Estuary, southwest Britain." Thesis, University of Reading, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421620.
Full textCreuzer, Jessica Christine. "Estimating the Impact to Wetlands in Western North Dakota From Dust and Road Use Increases Due to Energy Development." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28242.
Full textVentura, Robert E. "Wetlands and Greenhouse Gas Fluxes: Causes and Effects of Climate Change – A Meta-Analysis." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/pomona_theses/107.
Full textTippett, Mark Donovan. "Impacts of timber harvesting on soil physical properties in wetlands." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09292009-020154/.
Full textFlores, Nicole Leiann. "Impact Assessment of Natural Resource Management Policy Research: A case study of the contribution of the Sustainable Wetlands Adaptation and Mitigation Project to the effectiveness of the Indonesian Forest Moratorium." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71894.
Full textMaster of Science
Wagner, Katrin Xin Xin [Verfasser]. "Impact Assessment of Land-Use Change and Agricultural Treatments on Greenhouse Gas Emissions from Wetlands of Uganda and Tanzania / Katrin Xin Xin Wagner." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1206417641/34.
Full textArmandine, Les Landes Antoine. "Impact des variations climatiques sur les ressources hydrogéologiques." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S101/document.
Full textGroundwater resources represent approximately 98% of global freshwater resources available for humans on our planet; therefore groundwater is fundamental resource of our societies. Due to climate change and strong link between climate and the cycle of water, an understandable concern is appeared about the potential impacts of climate change on water resources. Nowadays, growing body of evidence supports the fact that changes in climatic conditions (temperature, precipitation, evaporation…) impact the hydrologic cycle and consequently groundwater resources. The identification of groundwater sensibility to climate variations has become essential. The climate is a highly complex system where its variations drive by many factors both natural and human occurs on all time scales. Climatic changes are not a new phenomenon, groundwater resources have already been impacted by effects of climatic variations, are impacting presently and will be in the future. The work carried out under this thesis covered this problematic to characterize the groundwater resources sensibility to climate variations. With the help of environmental tracers analyzed at the regional scale, impacts of major climate events occurred since the last millions years (marine transgression and glacial period) have been identified in the current hydrogeologic system. Then, support by hydrogeological modeling the impact of climate change has been studied through the specific relationships between groundwater and surface water bodies and ocean. All these studies highlight the important sensibility of groundwater resources to climate variations in terms of quality (salinization) and quantity (lower water levels). Hydrogeological resources are particularly sensitive to climate and hydrological variations (recharge changes, seawater intrusion…), as well as to non-climatic factors (human activities). Thus groundwater resources management needs to consider both climatic and non-climatic risks and the long-term adaptation of these systems
Angell, Joseph A. "Analysis of direct and indirect impact costs attributed to the wetlands regulatory programs of the local, state and federal governments of the United States." Thesis, Springfield, Virginia: Available from National Technical Information Service, 1991. http://hdl.handle.net/10945/27952.
Full textGuénet, Hélène. "Impact des associations fer-matière organique sur la dynamique de l'arsenic." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S065/document.
Full textRegards to the extent of the As pollution in the world and its impact on human health, the processes controlling its dynamic had to be investigated, especially in wetlands, recently recognized as potential As source for groundwater. The objective of this work was to study the oxidation products of a wetland and the associated As speciation. In a first part, natural oxidation products collected in a wetland soil (Naizin-Kervidy, France) were studied. The solids analyzed by XAS showed that As was partially oxidized. The As (III) persistence was explained by the control exercised by MO on the Fe bearing phases of As responsible also for its oxidation. Iron formed nano-oxides, small polymers or monomers complexed to organic molecules. The small size of Fe phases limits the density of the As oxidizing sites. In the second part, the reoxidation products before their aggregation in soil were studied. Particulate, colloid and soluble fractions and their associated elements were analyzed by XAS, HPLC-ICP-MS, THM-GC-MS. The As was predominantly as inorganic As (V) and organic As (V) (Arsenobetaine and DMA) the latter being produced by biological detoxification process. The fraction enriched in Fe nano-oxides or small polymers/monomers bound to the OM was highly reactive against As. The composition of the OM varied from fresh vegetal and less complexing OM in particulate fraction to humic and highly complexing OM in lower fractions. In mass proportion, more than 90% of As was in the few mobile particulate fractions. The colloidal fraction remained however critical regards its substantial As concentration and its strong mobility potential. The Fe-OM aggregates seem to control As dynamics in solution, studying the influence of the aggregate structure on the As sorption processes is therefore critical. Aggregates of Fe/OM at increasing Fe/OM ratio were synthetized. Iron forms fractal aggregates. Primary beads formed intermediate aggregates (both being bound to diffuse organic molecules), themselves forming (or not) larger secondary aggregates. This latter was composed of a Fe part corresponding to the aggregated intermediate aggregates and an OM part organized as a spherical dense aggregate. With the increasing Fe/OM ratio, Fe and OM part increased and large aggregates become less dense with the increasing repulsion forces between each intermediate aggregates. The coating of the OM on Fe intermediate aggregates within the secondary aggregates decreased. These structural changes led to an increase of the As binding in response to the increasing availability of the binding site
Carlander, Anneli. "Assessment of microbial health hazards associated with wastewater application to willow coppice, coniferous forest and wetland systems /." Uppsala : Department of Crop Production Ecology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200629.pdf.
Full textZoete, Toivo. "Conservation of wetland functions in an environment of regional growth and change : melaleuca quinquenervia in the Moreton region of South-East Queensland." Thesis, Queensland University of Technology, 1997.
Find full textBoucher, Rachel Emeline. "Adaptive water governance and community resilience: Assessing the impact of the Cache River Wetlands Joint Venture Partnership on communities in the Cache River Watershed of southern Illinois." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2379.
Full textNdlala, Noluthando. "Remote sensing drought impacts on wetland vegetation productivity at the Soetendalsvlei in the Heuningnes Catchment, South Africa." University of Western Cape, 2021. http://hdl.handle.net/11394/8329.
Full textThis work aimed at assessing the response of wetland vegetation productivity to the 2014-2017 climate-induced drought at the Soetendalsvlei wetland system in the Western Cape province of South Africa. To achieve this objective, firstly a literature review on the progress of remotely sensed data applications in assessing and monitoring wetland vegetation productivity was conducted. The review elaborates on the role of remote sensing in monitoring and assessing wetland vegetation productivity, with a detailed discussion of the climate change and variability impacts on wetland vegetation productivity. Accurate assessment results are produced when suitable processing techniques are selected as well as appropriate spatial and spectral resolution for extracting spectral information of wetland vegetation productivity. Secondly, wetland vegetation changes and productivity status was assessed using multi-temporal resolution Landsat series imagery and Normalized Difference Vegetation Index (NDVI) during the wet and dry seasons for the period between 2014 and 2018.
Dech, Jeffery P. "Population establishment of Galerucella pusilla (Duft.) and G. calmariensis (L.) (Coleoptera, chrysomelidae) and their relative impact on the growth of Lythrum salicaria L. (Myrtiflorae: Lythraceae) in two central Ontario wetlands." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0009/MQ61258.pdf.
Full textCan?ado, Paulo Henrique Duarte. "Carrapatos de Animais Silvestres e Dom?sticos no Pantanal sul Mato-grossense (Sub-regi?o da Nhecol?ndia): Esp?cies, Hospedeiros e Infesta??es em ?reas de Manejos Diferentes." Universidade Federal Rural do Rio de Janeiro, 2008. https://tede.ufrrj.br/jspui/handle/tede/826.
Full textCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
This research is a study about the tick fauna of Pantanal wetlands, MS, Brazil. Evaluation of cattle-raising on ticks populations, a detailed study on tick feeding on feral pigs and a list of ticks witch are reported in the study area are included. The cattle-raising impact was evaluated by trapping free-living ticks using a CO2 tick-trap. The traps were distributed in two areas: protected area, and the Nhumirim Ranch. Both areas are contiguous and locate at sub-region of Nhecol?ndia (18?59 S and 56?39 W), Pantanal of Mato Grosso do Sul state, Brazil. In each area, four habitat types were selected: cerrado (tropical savanna), forest patches, lakes and soda lakes. The last two are temporary lagoons of fresh and salted water, respectively. A total of 980 nymphs, 613 adults and 13 larvae of ticks of the genus Amblyomma were collected in 256 hours of collection. In a pen of calves infested by Ornithodoros rostratus 114 specimens were collected in just two hours including larvae, nymphs and adults. Adults of A. cajennense and A. parvum were more abundant in the savanna at Nhumirim Ranch, but did not differ among habitat types at protected area. There was a tendency of having more nymphs in Nhumirim Ranch than in protected area. The second conduced experiment was the comparison of the tick fauna of feral pigs at dry and wet seasons. A total of 44 feral pigs were examined and the species found were A. cajennense, A. parvum e O. rostratus. More adult ticks were collected in the dry season. Ecological and epidemiological aspects were discussed. Feral pigs are introduced specie and the role of this mammal on amplifying Amblyomma cajennense is clear. O. rostratus seems to be accidental parasite of feral pigs. The last part is a commented list of species including collected data and scientific literature. Up to day 18 tick s specie are reported on Pantanal wetlands including Argasidae (two) and Ixodidae (16) tick s species. The main genus was Amblyomma and the same species founded on wildlife are present on domestic animals and humans.
A presente tese ? um estudo sobre o impacto da bovinocultura extensiva sobre a popula??o de carrapatos, e um levantamento da fauna de carrapatos da regi?o com um estudo detalhado sobre a ixodofauna do porco monteiro. Para o estudo de impacto da bovinocultura, foram utilizadas armadilhas de CO2, distribu?das em duas ?reas: Reserva Biol?gica e Fazenda Nhumirim. Ambas as ?reas s?o contiguas e est?o localizadas na sub-regi?o da Nhecol?ndia (18?59 S e 56?39 W). Em cada ?rea quatro tipos de habitat foram selecionados: cerrado, mata, baia e salina. Os dois ?ltimos s?o lagoas tempor?rias de ?gua doce e salobra, respectivamente. Na totalidade foram coletadas 980 ninfas, 613 adultos e 13 larvas de carrapatos do g?nero Amblyomma em 256 horas de coletas. Em um bezerreiro infestado por Ornithodoros rostratus, 114 exemplares, dentre larvas ninfas e adultos foram coletados em apenas duas horas de atividade. Adultos de A. cajennense e A. parvum foram mais abundantes no cerrado da Fazenda, mas n?o diferiram entre os tipos de habitat na Reserva Biol?gica. Existe uma tend?ncia para uma maior abund?ncia de ninfas de Amblyomma na Fazenda do que na Reserva Biol?gica. O outro estudo realizado comparou a fauna de carrapatos adultos dos porcos monteiros entre as esta??es, cheia e seca. Os carrapatos encontrados foram A. cajennense, A. parvum e O. rostratus. E foram encontrados mais carrapatos adultos na seca que na cheia, foi discutida a import?ncia eco-epidemiol?gica destas rela??es parasit?rias, principalmente em fun??o do Porco monteiro ser uma esp?cie introduzida na regi?o. O ?ltimo cap?tulo apresenta uma lista comentada que reuniu os dados coletados pelo autor bem como resultados publicados na literatura cient?fica. Nos dias de hoje, existe registro de 18 esp?cies de carrapatos inclu?do as fam?lias Argasidae (2) e Ixodidae (16). O g?nero mais comum foi Amblyomma e as mesmas esp?cies de carrapatos foram comuns para animais selvagens, dom?sticos e para o homem, o que constitui uma rede complexa e din?mica de hospedeiros e parasitas.
Parker, Nathaniel Ryan. "Assessing the effectiveness of water sensitive urban design in Southeast Queensland." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/34119/1/Nathaniel_Parker_Thesis.pdf.
Full textPaulsen, Sandra Silva. "Topics on the ecological economics of coastal zones : linking land uses, marine eutrophication, and fisheries /." Uppsala : Dept. of Economics, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200773.pdf.
Full textMcLean, Victoria Lynne. "Carp Impacts on Diked Wetland Communities." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392915387.
Full textKennedy, Michael Patrick. "Predicting the impact of hydrological change on wetland vegetation." Thesis, University of Glasgow, 2001. http://theses.gla.ac.uk/3984/.
Full textMatavire, Melisa M. "Impacts of sugarcane farming on coastal wetlands of the north coast of Zululand, Kwadukuza, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97121.
Full textENGLISH ABSTRACT: Wetlands are key to providing important ecosystem goods and services yet they are under threat from a number of anthropogenic activities. In particular, in this study area, agriculture in the form of sugarcane farming is a threat to wetlands as sugarcane is reliant on a good water supply. The impacts of sugarcane farming emanates from the fact that sugarcane is a mono crop that requires wetland resources and uses a lot of pesticides and fertilisers. Despite the assumed contribution of sugarcane farming to wetland loss and degradation, few studies have quantitatively assessed the spatio-temporal changes in wetland extent as well as changes in water quality because of this activity. This study assesses the impacts of sugarcane farming on wetland extent and water quality in two coastal wetlands of KwaDukuza, North coast of Zululand, South Africa. Specifically this study sought to (i) assess the impacts of sugarcane farming on the spatial extent of wetlands between 1959 and 2012, (ii) determine if sugarcane farming negatively affect water quality within the wetlands and (iii) evaluate the perceptions of local farmers regarding impacts of sugarcane farming on wetlands. Results of the study indicated an increase in the extent of Zinkwazi sugarcane fields from 62.3% to 67% between 1959 and 1989 and Nonoti sugarcane fields’ extent increased from 50.5 % to 56.4% between 1959 and 2000. The last decade from the year 2000 showed gradual decrease in the area of wetland farmed by sugarcane due to the global sugar price remaining static while the cost of farming inputs increased and due to conversion of some farms to urban developments. Unfortunately, this has not lead to an increase in wetland area as the waterfront type developments, as well as a formal settlement have replace the sugarcane in the wetlands. Water was analysed for nitrogen (N), phosphorus (P) and potassium (K) and results for both Zinkwazi and Nonoti indicated an increasing trend of N and P from upstream to the middle region of the rivers and a decreasing trend of the N and P from the middle region to downstream. Sugarcane farming does not take place below the middle region and so does not provide fresh sources of these nutrients. The downstream area where the N and P decrease also coincides with the area of the river under tidal influence such that the N and P are being diluted by the incoming tidal seawater. K showed an increasing trend from upstream to downstream and its values were higher than N and P. Concentrations of N and P above the South African water quality guidelines for aquatic ecosystem were recorded in the middle region. Furthermore, farmers’ perceived wetlands to have been transformed to agricultural land and related these changes to their sugarcane farming activities. It can thus, be concluded that sugarcane farming has resulted in wetland loss as well as deterioration of water quality within the Zinkwazi and Nonoti wetlands in KwaDukuza. In that regard, there isneed to engage farmers in wetland management programs in order to reduce the negative environmental impacts associated with sugarcane farming in wetlands.
AFRIKAANSE OPSOMMING: Vleilande is die sleutel tot die verskaffing van ‘n belangrike ekosisteem dienste, maar hulle is onder ‘n bedreiging deur 'n aantal menslike aktiwiteite. In besonder in hierdie studie area, is Argriculture in die vorm van suikerriet boerdery is bedraging vir vleilande, en suikerriet is afhanklik van 'n goeie watervoorraad. Ten spyte van die veronderstelde bydraes van suikerriet boerdery, is die vleiland aan die agteruitgang, 'n Paar studies het kwantitatief die tydruimtelike veranderinge in die vleiland, sowel as veranderinge in die gehalte van water as gevolg van hierdie aktiwiteit waargeneem. Spesifiek is hierdie studie gepoog om (i) te bepaal wat die impak van suikerriet boerdery op die ruimtelike omvang van die vleiland tussen 1959 en 2012 is, (ii) bepaal of suikerriet boerdery negatief beïnvloed is deur die gehalte van water in die vleilande en (iii) die persepsies van plaaslike boere rakende die evalueering en impak van suikerriet boerdery op die vleilande. Resultate van die studie het aangedui 'n toename in die omvang van Zinkwazi suikerriet velde van 62,3% tot 67% tussen 1959 en 1989, en die Nonoti suikerriet velde toegeneem het met 50,5% tot 56,4% tussen 1959 en 2000. Die laaste dekade van die jaar 2000 het geleidelike afname in die area van die vleilande getoon, omdat suikerriet as gevolg van die globale suiker prys die koste van boerdery-insette verhoog het, en dit het gelei tot die omskakeling van 'n paar plase na stedelike ontwikkelings. Ongelukkig het dit nie gelei tot 'n toename in die vleiland gebiede nie, met die gevolg die waterfront tipe ontwikkelings, asook 'n formele nedersetting, vervang die suikerriet in die vleilande. Water is ontleed vir N, P en K en resultate vir beide Zinkwazi en Nonoti, het aangedui 'n toenemende tendens van stikstof en Fosfor. Dit gaan stroomop na die middel-streek van die riviere en 'n dalende neiging van die N en P uit die middel streek stroomaf. Suikerriet boerdery vind nie plaas onder die middel streek nie, en so is daar nie vars bronne, wat van hierdie voedingstowwe verskaf nie. Die stroomaf gebied waar die N en P ‘n afname het, val ook saam met die gebied van die rivier onder die gety , en dit beinvloed sodanig dat die N en P se water verdun word deur die inkomende gety se seewater. K het 'n toenemende neiging van stroomop en stroomaf en sy waardes is hoër as van die N en P. Konsentrasies van N en P bo die Suid-Afrikaanse water standaard riglyne is in die middel streek aangeteken. Verder, beskou boere dat die vleilande behoort te verander om die landbougrond en verwante veranderinge aan hul suikerriet boerdery en aktiwiteite. Ons kan dus aflei dat suikerriet boerdery het gelei tot die vleiland se verlies asook die verandering in die watergehalte in die Zinkwazi en die Nonoti vleilande in KwaDukuza. In dié verband is dit nodig dat die boere in die vleiland by programme betrek word ten einde die negatiewe omgewingsimpakte wat met suikerriet boerdery gepaard gaan in vleilande te verminder.
Fritz, Savannah Joy. "Change in Reference Condition Wetlands and Road Dust Impacts on Spider Mites." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28698.
Full textGoddard, Nathaniel L. "Bird Communities of Isolated Cypress Wetlands Along an Urban Gradient in Hillsborough County, Florida." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1643.
Full textSampson, Shae-Lynn. "Response of wetlands to impacts from agricultural land-use practices: Implications for conservation, management, and rehabilitation in the Nuwejaars Catchment, Western Cape." University of the Western Cape, 2021. http://hdl.handle.net/11394/8154.
Full textWetlands occupy about 6% of the world’s surface and are fragile ecosystems that support a diversity of plants and animals. Wetlands are increasingly recognised for their role in the provision of ecosystem services and contribution to global biodiversity. Despite this, more than half of the world’s wetlands have vanished or been degraded, primarily due to agriculture. Wetlands are constantly adjusting to disturbances occurring within them and within their surrounding landscape. It is important to recognise to what extent various disturbances affect wetlands when assessing disturbance and impact, and when considering wetland protection options. The benefit of the detailed characterisation of the sub-catchments of the Nuwejaars catchment is deepened understanding of how different combinations of land-uses and soils impact catchment hydrology, and ultimately, the wetlands within the catchment
Williamson, Jennifer Louise. "The impacts of elevated ozone on Plant vitality and carbon cycling in Wetlands." Thesis, Bangor University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510274.
Full textDrinkard, Maureen Katherine. "IMPACTS OF A FLOOD PULSING HYDROLOGY ON PLANTS AND INVERTEBRATES IN RIPARIAN WETLANDS." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1342805313.
Full textHopson, Adrienne M. "Impacts of Anthropogenic Noise on Aquatic Invertebrates in Wetland Habitats." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent15645874111271.
Full textReed, Sharon Elizabeth. "Impact of macrophyte functional diversity on primary productivity and methane fluxes in wetland." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407504662.
Full textFortune, Faeeza. "The impact of climate change and climate variability on coastal wetland ecosystem dynamics." University of the Western Cape, 2018. http://hdl.handle.net/11394/6666.
Full textThis thesis investigates the influence of climate change and climatic variability on wetland ecosystems (coastal and inland wetlands) on the Agulhas coastal plain. Firstly, this research examines coastal wetland ecosystem resilience to sea level rise by modelling sea level rise trajectories for the Droё River wetland. The rate of sediment accretion was modelled relative to IPCC sea level rise estimates for multiple RCP scenarios. For each scenario, inundation by neap and spring tide and the 2-, 4- and 8-year recurrence interval water level was modelled over a period of 200 years. When tidal variation is considered, the rate of sediment accretion exceeds rising sea levels associated with climate change, resulting in no major changes in terms of inundation. When sea level rise scenarios were modelled in conjunction with the recurrence interval water levels, flooding of the coastal wetland was much greater than current levels for the 1 in 4 and 1 in 8 year events. The study suggests that for this wetland, variability of flows may be a key factor contributing to wetland resilience. Secondly, the thesis examines the variability of open wetland water surface areas and their relation to rainfall to determine wetland hydrological inputs for the Nuwejaars wetland system and respective wetlands. A remote sensing approach was adopted, Landsat 5 TM and 8 OLI multispectral imagery were used to detect changes of water surfaces for the period 1989 to 2017. Water surfaces were enhanced and extracted using the Modified Normalized Difference Water Index of Xu (2006). The coefficient of variation of wetland water surface area was determined. The variability ranges from low to high for respective wetlands. A correlation analysis of wetland water surfaces and local and catchment rainfall for the preceding 1, 3, 6, 9, 12 and 24 months was undertaken. The preceding month and associated inputs explains the annual variability of surface waters. The study suggests that, the variability of wetland water surface area are related to variations to water inputs and groundwater, as well as variations in water outputs such as evapotranspiration and an outlet channel.
Cheng, Yiwei. "Impacts of self-organizing mechanism and topography on wetland ecosystem dynamics." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47705.
Full textHouse, A. R. "Ecohydrological impacts of climate change on a riparian chalk valley wetland." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1498770/.
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