Дисертації з теми "Ecological risk assessment Philippines"
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Davis, Ryan Scott. "An ecological risk assessment for mosquito insecticides." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/davis/DavisR0507.pdf.
Повний текст джерелаHazlerigg, Charles Rupert Edward. "Fish population ecology and ecological risk assessment." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9678.
Повний текст джерелаPokhrel, Lok R., and Phillip R. Scheuerman. "Ecological Risk Assessment of Zinc Oxide Nanoparticles." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/2962.
Повний текст джерелаPokhrel, Lok R., Brajesh Dubey, and Phillip R. Scheuerman. "Ecological Risk Assessment of Zinc Oxide Nanoparticles." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/2951.
Повний текст джерелаChen, Limei. "Nonparametric assessment of safety levels in ecological risk assessment (ERA)." FIU Digital Commons, 2003. http://digitalcommons.fiu.edu/etd/2135.
Повний текст джерелаWhittle, Don. "Stream mesocosms in ecological risk assessment : experimental, analytical and ecological considerations." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339940.
Повний текст джерелаHayes, Keith Robert. "Quantitive ecological risk assessment a ballast-water case study." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1230.
Повний текст джерелаIp, Tsz-kin Derek. "Ecological risk assessments for marine mammals in Hong Kong." View the Table of Contents & Abstract, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37120694.
Повний текст джерелаOliveira, Paulo Alexandre da Silva. "Ecological risk assessment of pesticides in maize and tomato crops." Master's thesis, ISA/UL, 2017. http://hdl.handle.net/10400.5/17946.
Повний текст джерелаFoi realizado um estudo das comunidades de zooplâncton presentes na água de irrigação das culturas de milho e tomate em condições mediterrâneas portuguesas, a fim de vincular possíveis relações entre a exposição a pesticidas e as respostas biológicas. Este trabalho é uma contribuição para melhorar a relevância ecológica da Avaliação do Risco Ambiental de Pesticidas. Um total de 37 espécies de rotiferos e 2 famílias de cladóceros foram identificadas. Os principais componentes do zooplâncton em todos os locais de amostragem foram nauplios e rotíferos que parecem ser menos afetados pelos pesticidas. A concentração de 12 ug / l de clorpirifos reduz o número de macrozooplâncton, permitindo o aumento das densidades de rotiferos. Valores de 3,5-4,7 ug / l de clorantrinaprole e 0,96 ug / l de metribuzina parecem afetar negativamente o tamanho da comunidade de copépodos. As comunidades de Cladóceros e Ostracodes parecem diminuir quando os valores do glifosato estão na faixa de 2,3-3,9 ug / l. Os valores de glifosato (0,66 ug / l), Ampa (0,88 ug / l) e Fosfato (2,38 mg / l) parecem estar ligados a valores mais baixos de índice de riqueza de espécies
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DUARTE, Heitor de Oliveira. "A methodology for quantitative ecological risk assessment for industrial accidents." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/5960.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Recentes acidentes industriais, como vazamentos tóxicos, têm causado danos catastróficos ao meio ecológico (i.e. plantas e animais), de modo que um método efetivo para analisar riscos ecológicos tem sido demandado. Em primeiro lugar, este trabalho tem como objetivo propor uma metodologia capaz de quantificar riscos ecológicos inerentes a eventos raros como acidentes industriais. Utiliza-se a modelagem populacional para simular futuras mudanças na abundância populacional de espécies-chave em risco e, assim, estimar a probabilidade de extinção ou declínio, tempo para extinção e outras medidas, para cada cenário acidental. Assim, foi possível desenvolver uma abordagem que combina os danos ecológicos (previstos através da modelagem populacional) com a frequência de ocorrência do cenário acidental (estimada através de dados históricos e análise de confiabilidade). O resultado é uma curva de risco FN (similar ao resultado de uma análise de risco a humanos), onde N é o declínio populacional médio e F a frequência acumulada de acidentes com declínio maior ou igual a N. Em segundo lugar, o trabalho apresenta uma aplicação da metodologia para quantificar os riscos ecológicos provenientes de acidentes associados ao transporte e manuseio de petróleo que abastece uma refinaria no Complexo Industrial Portuário de Suape-PE, no Nordeste do Brasil. Esta instalação está localizada próxima a um rico ecossistema aquático de alta biodiversidade. A população de uma espécie nativa foi estrategicamente escolhida para representar o ecossistema, alguns cenários de derramamento de petróleo foram simulados e suas frequências de ocorrência estimadas. Para cada cenário acidental, a concentração de óleo que atinge a população foi prevista via modelagem de destino e transporte. Os riscos ecológicos foram quantificados e apresentados em uma curva FN. Uma análise de sensibilidade foi feita para explorar como mudanças em parâmetros específicos causam mudanças nas medidas de risco. Além disso, a incerteza foi medida como um intervalo (limite superior e inferior) para as medidas de riscos com base em cenários pessimistas e otimistas. Finalmente, a metodologia mostrou-se viável, eficiente, conveniente e flexível, apesar de que algumas melhorias ainda podem ser feitas e estas foram propostas para trabalhos futuros
Silva, Emília Cardoso Moura da. "Approaches to improve the ecological risk assessment of pesticides in freshwaters." Doctoral thesis, ISA/UL, 2015. http://hdl.handle.net/10400.5/9255.
Повний текст джерелаOne of the most important ways of improving agricultural production is the use of plant protection products. As this type of pesticides is used within the catchment area of freshwaters there is a potential for side-effects to occur in aquatic ecosystems. New challenges for risk assessment were addressed to achieve good chemical and ecological status in European water bodies. Site-specific and ecologically-based approaches were developed and applied to three important Portuguese river basins. Better criteria for the assessment of the ecological and chemical status of water bodies was provided by calculating groundwater threshold values for pesticides and by focusing on river basin specific pollutants. A list of priority pesticide mixtures that might pose aquatic risks was obtained by employing risk quotients based on concentration addition as a ‘screening level’ risk assessment of pesticide mixtures, and the multi-substance potentially affected fraction, representing a higher tier, with more practical usefulness and relevancy for risk management. For an integrated assessment of pesticide stress in freshwaters, and moving toward a more holistic approach, chemical analysis were used in combination with effect-based tools, in order to provide a link between chemical and ecological assessments. The results contribute for reducing the risks of pesticides in freshwaters
FCT
Su, Yang. "Development of an Ecological Risk Assessment Tool for Trace Organic Compounds." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428653300.
Повний текст джерелаSubida, Ronald Dollete. "Environmental health risk assessment of particulate air pollution and mortality in metropolitan Manila, Philippines." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2004. http://researchonline.lshtm.ac.uk/682322/.
Повний текст джерелаIp, Tsz-kin Derek, and 葉子健. "Ecological risk assessments for marine mammals in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B39849132.
Повний текст джерелаSinnett, Danielle. "Application of ecological risk assessment to community greenspace establishment on contaminated land." Thesis, University of Reading, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525132.
Повний текст джерелаDUARTE, Heitor de Oliveira. "A novel quantitative ecological and microbial risk assessment methodology: theory and applications." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17633.
Повний текст джерелаMade available in DSpace on 2016-08-05T15:07:47Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) 20160404 Tese final Duarte catalogada formato digital.pdf: 4026733 bytes, checksum: d6ac5259ffcea51116ee53e1ba8c164a (MD5) Previous issue date: 2016-03-18
CNPq
The environment is a complex system where human, ecological environment (e.g., plants, animals, microbes), materials (eg, pollutants, medical), and meteorological/oceanographic conditions interact. The human impact has potential to cause significant damage to the ecological environment (e.g., potential oil spills on the coast cause risk to coastal ecosystems, tuna industrial fishing cause risk to sharks that are bycaught). Similarly, the human impact may turn against the human itself by favoring the growth of populations of unwanted species (e.g., poor sanitation favors the growth of microbial populations that cause risk of an excessive proportion of sick humans). Therefore, it has been demanded an efficient method of quantifying the risks in systems where plant, animals or microbes populations are involved in order to give support to risk management in environmental issues, fisheries management and public health. First, this paper proposes a methodology capable of quantifying ecological risks (i.e., likelihood of adverse effects on the ecosystem, in the long term, due to exposure to stressors such as chemical, fishing, etc.) or microbial risks (i.e., likelihood of adverse effects in humans, in the long term, due to exposure to microbial pathogens). It uses population modeling to simulate future changes in populations of ecologically important species (e.g., fish, corals, sharks), or undesirable (e.g., parasites), under conditional scenarios simulating the influence humans impacting and/or managing the risks. The risk is calculated in terms of probability of extinction or decline, explosion or growth of these populations over time. Second, the methodology is applied to four case studies in Brazil. Each of them have their specific conclusions, as follows. (1) Ecological Risk Assessment caused by potential maritime accidents in the transportation of oil to the port of Suape. Conclusion: low but significant ecological risk. (2) Ecological Risk Assessment caused by potential maritime accidents in the passage of oil tankers nearby Fernando de Noronha. Conclusion: negligible ecological risk, although a more detailed analysis is required due to limited data. (3) Microbial Risk Assessment to Porto de Galinhas community inherent to sanitation and medical treatment program. Conclusion: high microbial risk, the current sanitation level is not enough to contain the spread of schistosomiasis disease, and periodic treatment of patients is not efficient to reduce risks significantly. (4) Ecological Risk Assessment of tuna industrial fishing in Brazilian waters. Conclusion: industrial tuna fishing does not cause significant risks to the population of Mako sharks in the South Atlantic Ocean. In each case study, several conditional scenarios were simulated for the next 100 years, including adverse scenarios and scenarios with risk control measures. Thus, it was possible to quantify the added risk caused by each adverse condition as well as the reduced risk caused by each control measure. In this way, the manager has objective information to prioritize scenarios and evaluate the cost-effectiveness of control measures. The general conclusion of this work is that the proposed methodology has proven to be practicable, useful and efficient.
O meio-ambiente é um sistema complexo onde interagem humanos, meio ecológico (e.g., plantas, animais, micróbios), materiais (e.g., poluentes, medicinais) e condições meteorológicas/oceanográficas. O impacto humano tem potencial para causar danos significativos ao meio ecológico (e.g., potenciais vazamentos de petróleo na costa causam risco ao ecossistema costeiro, pesca industrial de atum causa risco aos tubarões que são pescados por acidente). Similarmente, o impacto humano pode se voltar contra o próprio humano ao favorecer o crescimento de populações de espécies indesejáveis (e.g., saneamento básico precário favorece o crescimento de populações de micróbios que causam risco de haver uma excessiva parcela de humanos doentes). Portanto, tem sido demandado um método eficiente de quantificar os riscos inerentes a sistemas onde populações de plantas, animais ou micróbios estejam envolvidas, de forma a dar suporte para o gerenciamento dos riscos em problemas de gestão ambiental, gestão pesqueira e saúde pública. Em primeiro lugar, este trabalho propõe uma metodologia capaz de quantificar riscos ecológicos (i.e., probabilidade de ocorrência de efeitos adversos no ecossistema, no longo prazo, devido à exposição a estressores como químicos, pesca, entre outros) ou microbianos (i.e., probabilidade de ocorrência de efeitos adversos em humanos, no longo prazo, devido à exposição a patógenos microbianos). Utilizase a modelagem populacional para simular futuras mudanças nas populações de espécies ecologicamente importantes (e.g., peixes, corais), ou indesejáveis (e.g., parasitas), quando condicionadas a cenários que simulam a influência do humano causando impacto e/ou gerindo os riscos. O risco é calculado em termos de probabilidade de extinção ou declínio, explosão ou crescimento, dessas populações ao longo do tempo. Em segundo lugar, aplica-se a metodologia para avaliar o risco inerente a quatro estudos de caso no Brasil. Cada um deles tem sua conclusão específica, como segue. (1) Análise de Risco Ecológico causado por potenciais acidentes marítimos no transporte de petróleo para o porto de Suape. Conclusão: baixo risco ecológico, porém significativo. (2) Análise de Risco Ecológico causado por potenciais acidentes marítimos na passagem de navios petroleiros ao largo de Fernando de Noronha. Conclusão: risco ecológico negligenciável, mas uma análise mais detalhada é necessária devido à escassez de dados. (3) Análise de Risco Microbiano à comunidade de Porto de Galinhas inerentes ao sistema de saneamento básico e programa de tratamento medicinal. Conclusão: alto risco microbiano, o nível de saneamento básico atual não é suficiente para conter a proliferação da doença esquistossomose, e o tratamento periódico de doentes não é eficiente para reduzir os riscos significativamente. (4) Análise de Risco Ecológico causado pela pesca industrial de atum em águas brasileiras. Conclusão: a pesca industrial de atuns não causa riscos significativos à população de tubarões Mako no oceano Atlântico Sul. Em cada estudo de caso, foram simulados diversos cenários condicionais para os próximos 100 anos, incluindo cenários adversos e cenários com medidas de controle dos riscos. Assim, foi possível quantificar a adição do risco causada por cada cenário adverso e a redução do risco causada por cada medida de controle. Desta forma, o gestor tem informação objetiva para priorizar cenários e avaliar o custo-benefício das medidas de controle. A principal conclusão deste trabalho é que a metodologia proposta provou-se ser praticável, útil e eficiente.
Sanchez, André Luís. "Ecological risk assessment in pesticide contamination scenarios: from individuals to ecosystems responses." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-06102016-101708/.
Повний текст джерелаOs estudos de avaliação de risco ecológico consistem em avaliar os riscos ecológicos ocasionados pelas diversas atividades antropogênicas a um determinado sistema. Essa abordagem de integração reporta a estimativa dos efeitos de risco adverso através dos níveis de organização biológica potencialmente expostos a pertubação, incluindo assim uma melhor compreensão da complexidade dos ecossistemas. É bem conhecido que os pesticidas possuem efeitos nocivos ao meio ambiente, contribuindo para a perda de biodiversidade e mudanças nos níveis tróficos. A partir dessa análise, o objetivo geral desse estudo foi uma avaliação de risco ecológico em cenários de contaminação por pesticidas em relação aos compartimentos terrestres e aquáticos. Para tanto, foram avaliados os efeitos diretos e indiretos sobre as respostas individuais para diferentes níveis de organização biológica e para as interações multitróficas através de modelos ecossistêmicos. Assim, foram analisados os impactos ambientais em relação as perdas e mudanças das funções e serviços dos ecossistemas. Para esse propósito, foram desenvolvidos cenários de risco em relação as rotas de exposição do antiparasitário Ivermectin para a minhoca Eisenia fetida em relação a testes de reprodução, através da via dermal (solo) e oral (comida). Foi construída uma abordagem experimental para caracterizar os efeitos do fungicida Scala® (Pyrimethanil), comparando a aplicação através de pulverização por spray com a aplicação homogênea no solo em um sistema terrestre multiespécies. Experimentos foram realizados para reportar os efeitos do fungicida Mythos® (Pyrimethanil) em plantas terrestres alvo, seguidos por teste com elutriato com organismos de água doce não-alvo e testes de fuga com invertebrados terrestres não-alvo e uma quantificação dos serviços ecossistêmicos. Foi realizada uma avaliação de risco holística do fungicida pyrimethanil com respostas dos organismos terrestres e aquáticos e das interações tróficas através dos modelos ecossistêmicos e complementados com respostas individuais. Os resultados obtidos sugerem que os parâmetros de reprodução para as minhocas foram afetados com o aumento das concentrações de ivermectina com diferenças estatísticas significativas entre as rotas de exposição a contaminação. O fungicida pyrimethanil mostrou efeitos adversos sobre os invertebrados terrestres para as aplicações do pesticida e para a distribuição espacial, sendo as preferências de habitat e habilidade de forageio direta ou indiretamente afetadas pela toxicidade do fungicida. Os possíveis impactos do runoff e lixiviação nos corpos de água e solos adjacentes mostram mudanças na estrutura da comunidade com mudanças e perdas nos serviços ecossistêmicos de provisão, regulação e suporte. A avaliação de risco holística mostrou os impactos e efeitos adversos sobre os organismos terrestres e aquáticos, ecossistemas e processos nos diferentes cenários de simulação. Ao analisar os dados obtidos é possível concluir que os experimentos realizados permeiam os múltiplos aspectos da contaminação por pesticidas, mostrando respostas de indivíduos a ecossistemas através das rotas de exposição da contaminação, interações multitróficas a partir dos experimentos de modelos ecossistêmicos, respostas individuais, comportamentais e comparativas com os sistemas terrestres e aquáticos em avaliações de risco ecológico. Portanto, esse estudo se apresenta como um importante registro dos efeitos deletérios e das respostas dos impactos por pesticidas, levando a possíveis perdas e mudanças das funções e serviços ecossistêmicos em áreas com distúrbios.
Leitão, Sara Pais de Almeida da Silva. "New improvements on pesticide ecological risk assessment on the soil-water interface." Doctoral thesis, ISA, 2013. http://hdl.handle.net/10400.5/6449.
Повний текст джерелаImproving knowledge to evaluate and reduce pesticide impacts in the environment is a present concern to achieve their sustainable use. With the aim of increasing ecological relevance on the environmental risk assessment of pesticides (ERA), an integrated approach was undertaken linking pesticide fate and effects on aquatic and terrestrial non-target organisms under irrigated crop-based scenarios in Mediterranean realistic conditions, for which there is a lack of studies. Pesticides fate and effects were assessed by adopting an innovative approach embracing different levels of ERA complexity: a refined first-tier with the use of natural soil in ecotoxicological testing, instead of the conventional artificial soil; a refined higher-tier level performing simulations of cropbased agricultural scenarios of maize, potato and onion crops, with the application of the fungicides azoxystrobin and chlorothalonil and the insecticide ethoprophos, using a new semi-field methodology; and an higher tier field study incorporating biological interactions and dynamics of soil fauna communities and environmental factors that determine the effects of pesticides in the field under realistic agricultural practices. This study will increase the knowledge on ecological risks of pesticides under field situations improving decision making towards a sustainable use of pesticides and ecological protection
Arumugam, Anandkumar. "Ecological risk assessment of the Miri coast, Sarawak, Borneo: A biogeochemical approach." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/698.
Повний текст джерелаWard, Daniel John. "An ecological assessment of secondary poisoning risk in the Australian sugarcane industry." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/31325/1/Daniel_Ward_Thesis.pdf.
Повний текст джерелаJIANG, HUAN. "Ecological Risk Assessment of Salts in Swedish Freshwater Ecosystem : A preliminary assessment for invertebrates and vertebrates." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16578.
Повний текст джерелаNegreiros, Gustavo Hees de. "Understanding and modeling ecological processes controlling flammability in seasonally dry evergreen forests of the Brazillian Amazon /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5528.
Повний текст джерелаTakacs, P. "Evaluation of probabilistic ecological risk assessment methodology using aquatic microcosms and azinphos-methyl." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ43226.pdf.
Повний текст джерелаPham, Vivian G. "Ecological Risk Assessment of Heavy Metal Content in the Hatillo River, Costa Rica." Scholarship @ Claremont, 2015. http://scholarship.claremont.edu/scripps_theses/571.
Повний текст джерелаGerber, Liezel. "Biodiversity risk assessment of South Africa’s municipalities." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1614.
Повний текст джерелаSouth Africa is one of the most biodiverse countries in the world and even with conservation initiatives in place continues to face biodiversity loss. There is a need to prioritise areas for conservation as resources for conservation purposes are limited in South Africa. From prioritisation methods reviewed it was found that prioritisation indices normally use one or a combination of variables that measure stock; and/or variables that measure threat.
Rose, Robyn Ilene. "An ecological risk assessment of BT transgenic sweet corn on non-target arthropod communities." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2451.
Повний текст джерелаThesis research directed by: Entomology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Mellet, Bernice. "Ecological risk assessment of fisheries on sea turtles in the South Western Indian Ocean." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/9957.
Повний текст джерелаClaassen, Marius. "The development and application of ecological risk assessment in South African water resource management." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1006177.
Повний текст джерелаKapo, Katherine E. "Eco-Epidemiological Analysis for Screening-Level Ecological Risk Assessment: A Geographic Information Systems Approach." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1246903901.
Повний текст джерелаDuodu, Godfred Odame. "Characterisation, source apportionment and ecological risk assessment of some pollutants in Brisbane river sediment." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103672/1/Godfred%20Odame_Duodu_Thesis.pdf.
Повний текст джерелаSorenson, Mary T. "Deterministic vs probabilistic ecological risk assessment modeling at hazardous waste sites : a comparative case study." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/25303.
Повний текст джерелаSchad, Thorsten [Verfasser]. "Xplicit – a modelling framework for ecological risk characterisation at landscape-scales in regulatory risk assessment and risk managementof plant protection products / Thorsten Schad." Landau : Universitätsbibliothek Landau, 2013. http://d-nb.info/1037920015/34.
Повний текст джерелаDoyle, James. "Mass Balance Tracer Techniques for Integrating in situ Soil Ingestion Rates into Human and Ecological Risk Assessments." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20557.
Повний текст джерелаSäterberg, Torbjörn. "Minimum Ecologically Viable Populations : Risk assessment from a multispecies perspective." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18959.
Повний текст джерела
The extinction risk of threatened species has traditionally been assessed by the use of tools of Population Viability Analysis (PVA). Species interactions, however, have seldom been accounted for in PVA:s. The omission of species interactions in risk assessments may further lead to serious mistakes when setting target sizes of populations. Even a slight abundance decrease of a target species may result in changes of the community structure; in the worst case leading to a highly impoverished community. Of critical importance to conservation is therefore the question of how many individuals of a certain population that is needed in order to avoid this kind of consequences. In the current study, a stochastic multispecies model is used to estimate minimum ecological viable populations (MEVP); earlier defined as “the minimum size of a population that can survive before itself or some other species in the community becomes extinct”. The MEVP:s are compared to population sizes given by a single species model where interactions with other species are treated as a constant source incorporated in the species specific growth rate. MEVP:s are found to be larger than the population sizes given by the single species model. The results are trophic level dependent and multispecies approaches are suggested to be of major importance when setting target levels for species at the basal level. Species at higher trophic levels, however, are altogether more prone to extinction than species at the basal level, irrespective of food web size and food web complexity.
Preston, Benjamin Lee. "Toxicant interactions with the biotic and abiotic environment of freshwater rotifers : implications for ecological risk assessment." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/25217.
Повний текст джерелаCarlisle, Margaret. "Lead poisoning in the Spanish eagle population of the Doñana, SW Spain : an ecological risk assessment." Thesis, University of Aberdeen, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419652.
Повний текст джерелаSciera, Katherine Lynne. "Quantifying the effects of land use change on stream ecosystems for use in ecological risk assessment." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1233081388/.
Повний текст джерелаHau, Jorge Luis. "Toward environmentally conscious process systems engineering via joint thermodynamic accounting of industrial and ecological systems." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117650243.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xxii, 306 p.; also includes graphics. Includes bibliographical references (p. 290-306). Available online via OhioLINK's ETD Center
Mattson-Hansen, Kimberly M. "Modeling Ecological Risks at a Landscape Scale: Threat Assessment in the Upper Tennessee River Basin." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/78611.
Повний текст джерелаPh. D.
Huang, Yanran. "Exposure and risk assessment of organic UV filters : from environmental occurrence to human biomonitoring study." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/740.
Повний текст джерелаArteaga, Jorge Lobo. "Evaluation of the potential of translocated common cockle for ecological risk assessment studies: bioaccumulation and biomarkers test." Master's thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/2504.
Повний текст джерелаSediment–bound contamination is a major concern factor in estuaries and other confined coastal water bodies, frequently subjected to anthropogenic sources of pollution. In order to investigate the effects and responses of the common cockle (Cerastoderma edule, L. 1558, Bivalvia: Cardiidae) to sediment contaminants and to assess the species’ potential as an indicator organism, the bivalve was subjected to a laboratorial translocation assay with sediments collected from distinct sites of the Sado Estuary (Portugal). Cockles were collected from a mariculture site of the Sado estuary (Portugal), herewith identified as site A, and exposed through 28–day, semi–static laboratorial essays, to sediments collected from three other sites (B, C and D) of the estuary that revealed different levels of metals, organic contaminants and physico–chemical properties and that ranged from globally unimpacted to moderately impacted levels when compared to available sediment quality guidelines. The animals were surveyed for bioaccumulation of metals (Ni, Cu, Zn, As, Cd and Pb) and organic contaminants (PAHs, PCBs and DDTs). Two sets of potential biomarkers were employed to assess toxicity: whole–body metallothionein (MT) induction and digestive gland histopathology. The bioaccumulation factor (BAF) and the biota-to-soil accumulation factor(BSAF) were estimated as ecological indices of exposure to metals and organic compounds. Significant positive correlations between BSAF and MT were found for PHAs, and between each factor (BSAF and BAF) and MT were found for Cd. Histopathological alterations were found in cockles exposed to all sediments where they were translocated. The digestive gland integrity was found to be especially compromised in cockles from sediment B and C and at day 28 from sediment A. Results allowed concluding that C. edule responds to sediment–bound contamination and is capable to regulate and eliminate both types of contaminants and might, therefore, be suitable for biomonitoring. Still, the sediment contamination levels do not explain the variation in bioaccumulation and MT levels, which may result from the moderate contaminant concentrations found in sediments and, more importantly, from yet unexplained xenobiotic interaction effects.
Ching, C. Y. Terrance, and 程振英. "Deriving critical tissue concentrations of trace metals in fishes for ecology risk assessment." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B45013718.
Повний текст джерелаPlevrakis, Viktor. "Comparison of risk assessment methods for polluted soils in Sweden, Norway and Denmark." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-109376.
Повний текст джерелаPereira, Ana Carina Santos. "Linking exposure of mediterranean freshwater ecosystems to pesticides mixtures with their environmental side-effects." Doctoral thesis, ISA, 2017. http://hdl.handle.net/10400.5/14958.
Повний текст джерелаIn freshwater ecosystems associated with agricultural areas, organisms are exposed to a multitude of toxicologically and structurally distinct pesticides in concentrations that may fluctuate over time. However, the environmental risks of chemicals are traditionally evaluated and regulated on the basis of single substance. Understanding and improving the link between effects and exposure assessment is an important step in the current challenges of risk assessment in order to increase its ecological relevance. To this end, integrated approaches of different hierarchical levels of complexity and ecological realism have been developed and applied, including: exposure modelling, laboratory testing with individual organisms, species sensitivity distribution, ecosystem models and assessment of aquatic community interactions to evaluate the effects of realistic pesticide combinations on water bodies associated with rice, tomato and maize typical agroecosystems of Mediterranean conditions. Contributing to the overall knowledge of the adequacy of the prospective risk assessment and demonstrating that pesticide risk may be underestimated during the actual registration procedure. The data generated in the present study contributed to the derivation of optimized programs of measures under the scope of European legislation; the identification of sites with the highest expected impacts of pesticide mixtures; the evaluation of the major pesticide compounds that contributed mostly to the identified aquatic risks. Furthermore contribute to a deeper knowledge and unravel the effects of co-occurring chemicals, environmental and biological stressors in aquatic ecosystems considering the effects of biotic and abiotic interactions at community and ecosystem levels. The results contribute to reducing the risks of pesticides in freshwater
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Marshall, Dale. "An ecological risk assessment of dioxins and furans discharged by Fraser and Thompson River pulp and paper mills." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0025/MQ51411.pdf.
Повний текст джерелаSutherland, Glenn D. "Risk assessment for conservation under ecological uncertainty, a case study with a stream-dwelling amphibian in managed forests." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0012/NQ61179.pdf.
Повний текст джерелаMurcia, Silvia. "Myxobolus cerebralis in native Cutthroat trout of three spawning tributaries to Yellowstone Lake a qualitative ecological risk assessment /." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/murcia/MurciaS0808.pdf.
Повний текст джерелаHo, Chi-fai, and 何志輝. "Ecological risk assessment and management of invasive freshwater fish species from aquarium and ornamental trades in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/194580.
Повний текст джерелаpublished_or_final_version
Environmental Management
Master
Master of Science in Environmental Management
Babendreier, Justin Eric. "Hydrologic-Based Ecological Risk Assessment of Urban, Agriculture, and Coal Mining Impacts Upon Aquatic Habitat, Toxicity, and Biodiversity." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28470.
Повний текст джерелаPh. D.
Kulkarni, Devdutt [Verfasser]. "A combined approach of experiments and modelling for the implementation of freshwater copepods in ecological risk assessment / Devdutt Kulkarni." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1052162770/34.
Повний текст джерела