Дисертації з теми "Biological impacts"
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Shutes, Robert Brian Emmerson. "The biological impacts of urban runoff waters." Thesis, Middlesex University, 1995. http://eprints.mdx.ac.uk/10698/.
Повний текст джерелаGihwala, Kirti Narendra. "Flamingo foraging plasticity: ecological drivers and impacts." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25317.
Повний текст джерелаGichohi, Nathan W. "Ecological impacts of biological invasions on native birds in Africa." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/4747.
Повний текст джерелаJaeger, Andrea L. "Invasive species impacts on ecosystem structure and function." Diss., Connect to online resource - MSU authorized users, 2006.
Знайти повний текст джерелаWilson, Luke. "Elephant impacts on woody vegetation around artificial waterholes in Zambezi National Park, Zimbabwe." Master's thesis, Faculty of Science, 2020. http://hdl.handle.net/11427/32361.
Повний текст джерелаCalder-Potts, Ruth Naomi. "The biological and ecological impacts of hypoxia on coastal benthic communities." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9352.
Повний текст джерелаRamli, Mohd Fadzil Shuhaimi bin. "Impacts of coastal land reclamation on the fisheries of Mukim Lekir, Malaysia." Thesis, University of Hull, 2005. http://hydra.hull.ac.uk/resources/hull:11158.
Повний текст джерелаBrüning, Anika [Verfasser]. "Spotlight on fish: The biological impacts of artificial light at night / Anika Brüning." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1117028313/34.
Повний текст джерелаSuri, Jessleena. "Street-wise : does prey abundance buffer black sparrowhawks (Accipiter melanoleucus) from the negative health impacts of urbanisation?" Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20558.
Повний текст джерелаWalker, Stevie. "Climate change impacts on the ocean’s biological carbon pump in a CMIP6 Earth System Model:." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109224.
Повний текст джерелаThe ocean plays a key role in global carbon cycling, taking up CO2 from the atmosphere. A fraction of this CO2 is converted into organic carbon through primary production in the surface ocean and sequestered in the deep ocean through a process known as the biological pump. The ability of the biological pump to sequester carbon away from the atmosphere is influenced by the interaction between the annual cycle of ocean mixed layer depth (MLD), primary production, and ecosystem processes that influence export efficiency. Gravitational sinking of particulate organic carbon (POC) is the largest component of the biological pump and the aspect that is best represented in Earth System Models (ESMs). I use ESM data from CESM2, an ESM participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6), to investigate how a high-emissions climate change scenario will impact POC flux globally and regionally over the 21st century. The model simulates a 4.4% decrease in global POC flux at the 100 m depth horizon, from 7.12 Pg C/yr in the short-term (2014-2034) to 6.81 Pg C/yr in the long-term (2079-2099), indicating that the biological pump will become less efficient overall at sequestering carbon. However, the extent of change varies across the globe, including the largest POC flux declines in the North Atlantic, where the maximum annual MLD is projected to shoal immensely. In the future, a multi-model comparison across ESMs will allow for further analysis on the variability of these changes to the biological pump
Thesis (BS) — Boston College, 2021
Submitted to: Boston College. College of Arts and Sciences
Discipline: Departmental Honors
Discipline: Earth and Environmental Science
Champieux, Terrance M. "Impacts of a constructed oyster bed on infaunal invertebrate communities in Jack Dunster Marine Reserve." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1598629.
Повний текст джерелаOysters are important to estuarine ecosystems because of the functions they provide. Thus, oyster restoration projects are undertaken in areas where natural populations have declined. However, restoration techniques can impact sediment organic matter and benthic invertebrates that provide trophic support for important species. This study assesses the impacts of a constructed shell bed on associated sediment and invertebrate communities in a southern California bay. Within the bed site, organic matter, invertebrate abundance, and invertebrate species richness are lower only under the oyster bed. The alteration in the community under the shell is driven by a reduction in species. Tubificidae were the only remaining species under the shell. These results may be explained by the shells’ action as a barrier to the mud-water interface. While significant, impacts of oyster bed construction are spatially restricted to just under the bed. Longer-term studies should be conducted to address effects of the oysters themselves.
Shelton, Jeremy Mark. "Impacts of non-native rainbow trout on stream food webs in the Cape Floristic Region, South Africa integrating evidence from surveys and experiments." Doctoral thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/6189.
Повний текст джерелаIncludes bibliographical references.
Impacts of invasive predators may be influenced by whether or not native predators which function in the same way as the invasive predator exist in the recipient system. Impacts are expected to be strong in isolated systems lacking functionally similar predators because native species will be naïve to the foraging behaviour of the introduced predator, and because the invasion is likely to change the role which the native predator assemblage performs. In this thesis I studied how the introduction of a functionally novel predatory fish, rainbow trout Oncorhynchus mykiss, has affected native fish, and how changes in the functioning of the predator assemblage have influenced lower trophic levels, in headwater streams in a catchment area within the Cape Floristic Region, South Africa. Fish populations, benthic invertebrate assemblages, benthic algae and particulate organic matter were surveyed in each of 24 minimally-disturbed headwater streams in the upper Breede River catchment, and relevant environmental variables in each stream measured, over one summer.
CANTINHA, REBECA da S. "Estudo da resposta do caramujo Biomphalaria glabrata (Say, 1818) frente a estímulos ambientais estressores, com enfoque na proteína HSP70." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10168.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Vetter, Susanne. "Investigating the impacts of donkeys on a communal range in Namaqualand: how much does a donkey "cost" in goat units?" Bachelor's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/25776.
Повний текст джерелаKadye, Wilbert Takawira. "Assessing the impacts of invasive non-native African sharptooth catfish Clarias Gariepinus." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005070.
Повний текст джерелаAsiry, Khalid A. M. "The impacts of cereal-legume intercropping on biological control of cereal aphids within temperate agro-ecosystems." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541943.
Повний текст джерелаMcClees, Whitney Elizabeth. "Anthropogenic Effects on the Fouling Community: Impacts of Biological Invasions and Anthropogenic Structures on Community Structure." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3883.
Повний текст джерелаGARCIA, MARCIA A. A. "caracterizacao radioquimica e impacto radiologico ambiental no processamento de cassiterita para producao de estanho e chumbo metalicos." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9389.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:04:05Z (GMT). No. of bitstreams: 0
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Wallace, S. Scott. "Fisheries impacts on marine ecosystems and biological diversity : the role for marine protected areas in British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ46442.pdf.
Повний текст джерелаGoldsmith, William Morris. "Characterizing the Biological Impacts and Human Dimensions of the U.S. East Coast Recreational Atlantic Bluefin Tuna Fishery." W&M ScholarWorks, 2018. https://scholarworks.wm.edu/etd/1530192320.
Повний текст джерелаCordonnier, Marion. "Impacts of global changes on biological invasions and interspecific hybridization within the Tetramorium caespitum ant species complex." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1243/document.
Повний текст джерелаClimate change, urbanization, biological invasions and interspecific hybridization are major current threats to biodiversity. The objective of this thesis was to assess their interactive effects in Tetramorium ant species from the Rhône-Saône valley in France. Using a broad array of tools from several fields of biology, I worked on almost two thousand colonies from five Tetramorium species including T. immigrans and T. caespitum. Both climate and urbanization limited the ranges of these species, and urbanization impacted their distributions simultaneously at several spatial scales. The occurrence probabilities of T. immigrans depended on the interaction between climatic and urban factors. Several introductions from external sources seemed to have given rise to four genetically distinct populations of T. immigrans, making it likely that it is not native to the northernmost urban areas. Hybridization and introgression between T. immigrans and T. caespitum was frequent in zones of sympatry, and the detection of nuclear DNA backcrosses and mitochondrial-nuclear DNA discordance between the two species suggested that hybridization lead to fertile offspring (i.e. introgression). Cuticular hydrocarbon profiles were clearly differentiated between the two species and were correlated to heightened interspecific aggression against heterospecifics. Both species presented a monogyne polyandrous mating system, in which hybrid queens but no hybrid fathers contributed to hybrid offspring. Few studies on interspecific hybridization have addressed global change or biological invasions. These concepts are infrequently studied together, and their interactive effects are overlooked in the current literature. Taking these interrelationships into account and exploring multiple scales are essential to better understand the processes that generate patterns of genetic exchange
ASIIMWE, PETER, PETER C. ELLSWORTH, and STEVEN E. NARANJO. "Natural enemy impacts on Bemisia tabaci (MEAM1) dominate plant quality effects in the cotton system." WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621978.
Повний текст джерелаMiniutti, Danielle. "Assessing Impacts of the Aquatic Invaders in Maine (AIM) Workshop on Inquiry Pedagogy and Student Learning." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/MiniuttiD2009.pdf.
Повний текст джерелаMarappullige, Priyantha Kumara. "The impacts of tree density on the physical and biological characteristics of planted Mangrove stands in Sri Lanka." Thesis, Edinburgh Napier University, 2011. http://researchrepository.napier.ac.uk/Output/4467.
Повний текст джерелаWong, Pak Ki. "Impacts of Pomacea canaliculata on freshwater macrophytes and water quality, as well as its control with fish." HKBU Institutional Repository, 2010. http://repository.hkbu.edu.hk/etd_ra/1224.
Повний текст джерелаKrapfl, Kurt J. "IMPACTS OF HEMLOCK WOOLLY ADELGID ON TSUGA CANADENSIS FOREST COMMUNITIES IN GREAT SMOKY MOUNTAINS NATIONAL PARK, USA." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/175.
Повний текст джерелаIngram, Russell J., James T. Donaldson, and Foster Levy. "Impacts, Prevalence, and Spatio-Temporal Patterns of Lily Leaf Spot Disease on Lilium Grayi (Liliaceae), Gray’s Lily." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/5452.
Повний текст джерелаDumont, Isabelle. "Interactions between the microbial network and the organic matter in the Southern Ocean: impacts on the biological carbon pump." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210300.
Повний текст джерелаThe Southern Ocean (ca. 20% of the world ocean surface) is a key place for the regulation of Earth climate thanks to its capacity to absorb atmospheric carbon dioxide (CO2) by physico-chemical and biological mechanisms. The biological carbon pump is a major pathway of absorption of CO2 through which the CO2 incorporated into autotrophic microorganisms in surface waters is transferred to deep waters. This process is influenced by the extent of the primary production and by the intensity of the remineralization of organic matter along the water column. So, the annual cycle of sea ice, through its in situ production and remineralization processes but also, through the release of microorganisms, organic and inorganic nutrients (in particular iron)into the ocean has an impact on the carbon cycle of the Southern Ocean, notably by promoting the initiation of phytoplanktonic blooms at time of ice melting.
The present work focussed on the distribution of organic matter (OM) and its interactions with the microbial network (algae, bacteria and protozoa) in sea ice and ocean, with a special attention to the factors which regulate the biological carbon pump of the Southern Ocean. This thesis gathers data collected from a) late winter to summer in the Western Pacific sector, Western Weddell Sea and Bellingshausen Sea during three sea ice cruises ARISE, ISPOL-drifting station and SIMBA-drifting station and b) summer in the Sub-Antarctic and Polar Front Zone during the oceanographic cruise SAZ-Sense.
The sea ice covers were typical of first-year pack ice with thickness ranging between 0.3 and 1.2 m, and composed of granular and columnar ice. Sea ice temperature ranging between -8.9°C and -0.4°C, brines volume ranging between 2.9 to 28.2% and brines salinity from 10 to >100 were observed. These extreme physicochemical factors experienced by the microorganisms trapped into the semi-solid sea ice matrix therefore constitute an extreme change as compared to the open ocean. Sea ice algae were mainly composed of diatoms but autotrophic flagellates (such as dinoflagellates or Phaeocystis sp.) were also typically found in surface ice layers. Maximal algal biomass was usually observed in the bottom ice layers except during SIMBA where the maxima was localised in the top ice layers likely because of the snow and ice thickness which limit the light available in the ice cover. During early spring, the algal growth was controlled by the space availability (i.e. brine volume) while in spring/summer (ISPOL, SIMBA) the major nutrients availability inside sea ice may have controlled algal growth. At all seasons, high concentrations of dissolved and particulate organic matter were measured in sea ice as compared to the water column. Dissolved monomers (saccharides and amino acids) were accumulated in sea ice, in particular in winter. During spring and summer, polysaccharides constitute the main fraction of the dissolved saccharides pool. High concentrations of transparent exopolymeric particles (TEP), mainly constituted with saccharides, were present and their gel properties greatly influence the internal habitat of sea ice, by retaining the nutrients and by preventing the protozoa grazing pressure, inducing therefore an algal accumulation. The composition as well as the vertical distribution of OM in sea ice was linked to sea ice algae.
Besides, the distribution of microorganisms and organic compounds in the sea ice was also greatly influenced by the thermodynamics of the sea ice cover, as evidenced during a melting period for ISPOL and during a floodfreeze cycle for SIMBA. The bacteria distribution in the sea ice was not correlated with those of algae and organic matter. Indeed, the utilization of the accumulated organic matter by bacteria seemed to be limited by an external factor such as temperature, salinity or toxins rather than by the nature of the organic substrates, which are partly composed of labile monomeric saccharides. Thus the disconnection of the microbial loop leading to the OM accumulation was highlighted in sea ice.
In addition the biofilm formed by TEP was also involved in the retention of cells and other compounds(DOM, POM, and inorganic nutrients such as phosphate and iron) to the brine channels walls and thus in the timing of release of ice constituents when ice melts. The sequence of release in marginal ice zone, as studied in a microcosm experiments realized in controlled and trace-metal clean conditions, was likely favourable to the development of blooms in the marginal ice zone. Moreover microorganisms derived from sea ice (mainly <10 µm) seems able to thrive and grow in the water column as also the supply of organic nutrients and Fe seems to benefit to the pelagic microbial community.
Finally, the influence of the remineralization of organic matter by heterotrophic bacterioplankton on carbon export and biological carbon pump efficiency was investigated in the epipelagic (0-100 m) and mesopelagic(100-700 m) zones during the summer in the sub-Antarctic and Polar Front zones (SAZ and PFZ) of the Australian sector (Southern Ocean). Opposite to sea ice, bacterial biomass and activities followed Chl a and organic matter distributions. Bacterial abundance, biomass and activities drastically decreased below depths of 100-200 m. Nevertheless, depth-integrated rates through the thickness of the different water masses showed that the mesopelagic contribution of bacteria represents a non-negligible fraction, in particular in a diatom-dominated system./
L’océan Antarctique (± 20% de la surface totale des océans) est un endroit essentiel pour la régulation du climat de notre planète grâce à sa capacité d’absorber le dioxyde de carbone (CO2) atmosphérique par des mécanismes physico-chimique et biologique. La pompe biologique à carbone est un processus majeur de fixation de CO2 par les organismes autotrophes à la surface de l’océan et de transfert de carbone organique vers le fond de l’océan. Ce processus est influencé par l’importance de la production primaire ainsi que par l’intensité de la reminéralisation de la matière organique dans la colonne d’eau. Ainsi, le cycle annuel de la glace via sa production/reminéralisation in situ mais aussi via l’ensemencement de l’océan avec des microorganismes et des nutriments organiques et inorganiques (en particulier le fer) a un impact sur le cycle du carbone dans l’Océan Antarctique, notamment en favorisant l’initiation d’efflorescences phytoplanctoniques dans la zone marginale de glace.
Plus précisément, nous avons étudié les interactions entre le réseau microbien (algues, bactéries et protozoaires) et la matière organique dans le but d’évaluer leurs impacts potentiels sur la pompe biologique de carbone dans l’Océan Austral. Deux écosystèmes différents ont été étudiés :la glace de mer et le milieu océanique grâce à des échantillons prélevés lors des campagnes de glace ARISE, ISPOL et SIMBA et lors de la campagne océanographique SAZ-Sense, couvrant une période allant de la fin de l’hiver à l’été.
La glace de mer est un environnement très particulier dans lequel les microorganismes planctoniques se trouvent piégés lors de la formation de la banquise et dans lesquels ils subissent des conditions extrêmes de température et de salinité, notamment. Les banquises en océan ouvert étudiées (0,3 à 1,2 m d’épaisseur, températures de -8.9°C à -0.4°C, volumes relatifs de saumure de 2.9 à 28.2% et salinités de saumures entre 10 et jusque >100) étaient composées de glace columnaire et granulaire. Les algues de glace étaient principalement des diatomées mais des flagellés autotrophes (tels que des dinoflagellés ou Phaeocystis sp.) ont été typiquement observés dans les couches de glace de surface. Les biomasses algales maximales se trouvaient généralement dans la couche de glace de fond sauf à SIMBA où les maxima se trouvaient en surface, probablement en raison de l’épaisseur des couches de neige et de glace, limitant la lumière disponible dans la colonne de glace. Au début du printemps, la croissance algale était contrôlée par l’espace disponible (càd le volume des saumures) tandis qu’au printemps/été, la disponibilité en nutriments majeurs a pu la contrôler. A toutes les saisons, des concentrations élevées en matière organique (MO) dissoute et particulaire on été mesurées dans la glace de mer par rapport à l’océan. Des monomères dissous (sucres et acides aminés) étaient accumulés dans la glace, surtout en hiver. Au printemps et été, les polysaccharides dissous dominaient le réservoir de sucres. La MO était présente sous forme de TEP qui par leurs propriétés de gel modifie l’habitat interne de la glace. Ce biofilm retient les nutriments et gêne le mouvement des microorganismes. La composition et la distribution de la MO dans la glace étaient en partie reliées aux algues de glace. De plus, la thermodynamique de la couverture de glace peut contrôler la distribution des microorganismes et de la MO, comme observé lors de la fonte de la glace à ISPOL et lors du refroidissement de la banquise à SIMBA. La distribution des bactéries n’est pas corrélée avec celle des algues et de la MO dans la glace. En effet, la consommation de la MO par les bactéries semble être limitée non pas par la nature chimique des substrats mais par un facteur extérieur affectant le métabolisme bactérien tel que la température, la salinité ou une toxine. Le dysfonctionnement de la boucle microbienne menant à l’accumulation de la MO dans la glace a donc été mis en évidence dans nos échantillons.
De plus, le biofilm formé par les TEP est aussi impliquée dans l’attachement des cellules et autres composés aux parois des canaux de saumure et donc dans la séquence de largage lors de la fonte. Cette séquence semble propice au développement d’efflorescences phytoplanctoniques dans la zone marginale de glace. Les microorganismes originaires de la glace (surtout ceux de taille < 10 μm) semblent capables de croître dans la colonne d’eau et l’apport en nutriments organiques et inorganiques apparaît favorable à la croissance des microorganismes pélagiques.
Enfin, l’influence des activités hétérotrophes sur l’export de carbone et l’efficacité de la pompe biologique à carbone a été évaluée dans la couche de surface (0-100 m) et mésopélagique (100-700 m) de l’océan. Au contraire de la glace, les biomasses et activités bactériennes suivaient les distributions de la chlorophyll a et de la MO. Elles diminuent fortement en dessous de 100-200 m, néanmoins les valeurs intégrées sur la hauteur de la colonne d’eau indiquent que la reminéralisation de la MO par les bactéries dans la zone mésopélagique est loin d’être négligeable, spécialement dans une région dominée par les diatomées.
Doctorat en Sciences agronomiques et ingénierie biologique
info:eu-repo/semantics/nonPublished
Turner, Peter J. "The impacts of the environmental weed Asparagus Asparagoides and the ecological barriers to restoring invaded sites following biological control." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0136.
Повний текст джерелаPoulette, Megan Marie. "ECOSYSTEM IMPACTS OF THE INVASIVE SHRUB LONICERA MAACKII ARE INFLUENCED BY ASSOCIATIONS WITH NATIVE TREE SPECIES." UKnowledge, 2012. http://uknowledge.uky.edu/biology_etds/6.
Повний текст джерелаUapipatanakul, Somchai. "Monitoring, modelling and health impacts of air pollutants arising from the Maptaphut Industrial Estates, Thailand." Thesis, Northumbria University, 2009. http://nrl.northumbria.ac.uk/3138/.
Повний текст джерелаJackson, Michelle C. "Waves of invaders : interactions among invasive species and their impacts on ecosystem structure and functioning." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/27043.
Повний текст джерелаFranke, Morgan Elizabeth. "Understanding Invasive Species Impacts on Reclaimed Surface-Mined Lands." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73660.
Повний текст джерелаMaster of Science in Life Sciences
Zhou, Yanmin, and 周延敏. "Impacts of temperature and salinity on nitrification rate and microbial community in laboratory scale sequencing batch reactors(SBRs)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47050718.
Повний текст джерелаMeffin, Ross. "Invasion success and impacts of Hieracium lepidulum in a New Zealand tussock grassland and montane forest." Lincoln University, 2010. http://hdl.handle.net/10182/1808.
Повний текст джерелаGutperlet, Ruth [Verfasser], Kai [Akademischer Betreuer] [Gutachter] Bischof, and Ingrid [Gutachter] Kröncke. "Habitat dynamics in response to constructional impacts (JadeWeserPort) a biological approach / Ruth Gutperlet ; Gutachter: Kai Bischof, Ingrid Kröncke ; Betreuer: Kai Bischof." Bremen : Staats- und Universitätsbibliothek Bremen, 2016. http://d-nb.info/1113718811/34.
Повний текст джерелаKing, Lyle A. "Land application with saline-sodic coalbed natural gas co-produced waters in Wyoming's Powder River Basin impacts to soil and biological properties /." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1221694361&sid=3&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Повний текст джерелаCollier, Christopher D. "What are the Impacts of Anthropogenic Nitrogen Deposition on Biological Soil Crust Communities of the Colorado Plateau and the Oak Openings Regions?" University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1449441330.
Повний текст джерелаMATOS, JANARA de C. "Aspectos hidrobiologicos do complexo de represas Paraibuna-Piratininga, Sao Paulo, com enfase na comunidade fitoplanctonica." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9513.
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Dissertacao (Mestrado)
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Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Ginige, Pushpa. "Decontamination of biosolids for land application : metals bioleaching and process impacts on the nutrient value of biosolids." Thesis, Queensland University of Technology, 1998.
Знайти повний текст джерелаEarnest, Steven F. P. "Integrating GIS with Benthic Metrics: Calibrating a Biotic Index to Effectively Discriminate Stream Impacts in Urban Areas of the Blackland Prairie Eco-Region." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4425/.
Повний текст джерелаGrosh, Chris. "ADAPTABILITY IN A BHUTANESE REFUGEE COMMUNITY: NAVIGATING INTEGRATION AND THE IMPACTS ON NUTRITIONAL HEALTH AFTER U.S. RESETTLEMENT." UKnowledge, 2016. http://uknowledge.uky.edu/anthro_etds/22.
Повний текст джерелаSurget, Gwladys. "Processus adaptatifs des végétaux marins face au changement climatique à différentes échelles de temps et d'espace : dynamique de populations, métabolomique, écophysiologie et potentiels de valorisation." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0056/document.
Повний текст джерелаThree model species with a large distribution along European coasts, along a latitudinal gradient from Norway to Portugal was chosen: Sargassum muticum, Codium fragile and Gracilaria vermiculophylla. The aims of this PhD thesis were to study the phenology, ecophysiology and the metabolom of these non-native marine macrophytes and their ability to cope with a variation of environmental factors 1) at a population scale, 2) along the latitudinal gradient (in relation with the global climatic change) and to propose 3) bio-inspired molecules for industrial purposes. The latitudinal gradient corresponding to a thermic gradient, allows to imitate the global warming as climatic change ¡mpacts are most of the time only visible at decennial scale.Monitorings of ecology, metabolome and potential impacts of these macroalgae, at a population scale, allowed to study the development and life cycle of these models. In particular, G. vermiculophylla exhibited a specific phenology (with a majority of small vegetative fragments, <3cm) in the Bay of Brest and a highly tolerance to burial until 12 cm depth in the sediment by acclimatizing its metabolome together with the ability to maintain a dormancy physiology. This engineer species modifies deeply muddy shores of this Bay. Latitunal gradients's monitoring highlighted the phenological plasticity and a contrasted invasive potential of C.fragile between latitudes. During low spring tides, species exhibited an acclimation of their photophysiology between latitudes with photoinhibition process related to induce environmental stress. Furthermore, this work showed the multifunctional properties of polyphenols enriched extracts with antioxidant, photoprotective or osteogenic activities, highlighting the emergence of original bio-inspired pathways for cosmetic or biomaterial applications
Korsu, K. (Kai). "Ecology and impacts of nonnative salmonids with special reference to brook trout (Salvelinus fontinalis Mitchill) in North Europe." Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514288647.
Повний текст джерелаCASTRO, FLAVIA J. de. "Avaliação ecotoxicológica dos percolados das colunas de cinza de carvão e de solos com cinza de carvão utilizando Lactuca sativa e Daphnia similis como organismos teste." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10517.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:03:39Z (GMT). No. of bitstreams: 0
Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Gidoin, Cindy. "Impacts écologiques de l’invasion d’un insecte prédateur de graines (Hymenoptera Torymidae) dans un écosystème forestier méditerranéen." Thesis, Montpellier, SupAgro, 2014. http://www.theses.fr/2014NSAM0015/document.
Повний текст джерелаBiological invasions produce novel species assemblages in communities that likely result in novel interspecific interactions. Ecological impacts of invasions may be: (i) indirect, if the invader enters competition with resident species, and (ii) indirect if the invader is a predator or a parasite of resident species. Both indirect and direct ecological invasion impacts are likely to apply to invasive wasps of the Megastigmus genus (Hymenoptera: Torymidae), which exploit narrow ecological niches that overlap with those of resident insect species, and contribute to high mortality levels in host plant populations due to their high specialization on seeds. This thesis aimed at testing such predictions by studying the impacts of the invasion of M. schimitscheki on: (i) its resident competitor for the seed resource M. pinsapinis, and (ii) the expanding populations of its obligatory host the Atlas cedar (Cedrus atlantica) in southeastern France.An extensive spatio-temporal survey of Megastigmus spp. populations indicated that the rapid expansion of M. schimitscheki was associated with a strong decline of M. pinsapinis. A mechanistic-statistical modelling approach allowed us to show that an earlier phenology of M. schimitscheki had a stronger explanatory power of both invasion success and the competitive exclusion of the resident than temporal variation in resource supply.A theoretical approach of the indirect impact of M. schimitscheki on C. atlantica expansion dynamics was based on reaction-diffusion models. We showed that an Allee effect resulting from seed predation at the expansion front of a host population may increase the genetic contribution of host individuals situated in the bulk of the expansion front. Interestingly, this phenomenon results in a limited erosion of genetic diversity during the expansion phase of the host population.The empirical and theoretical approaches developed showed that the invasion of M. schimitscheki in French cedar forests had a strong and negative indirect impact on the demography of a resident species, but, parallely, such invasion may directly favour the maintenance of genetic diversity in expanding host plant populations
Odume, Oghenekaro Nelson. "Application of macroinvertebrate based biomonitoring approaches to assess anthropogenic impacts in the Swartkops River, South Africa." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006199.
Повний текст джерелаMarshall, Heather D. "Sensitization of CD8 T Cells During Acute Viral Infections Impacts Bystander and Latecomer CD8 T Cell Responses : A Dissertation." eScholarship@UMMS, 2009. https://escholarship.umassmed.edu/gsbs_diss/440.
Повний текст джерелаWarui, Charles Mwaura. "Impacts of wildlife and cattle grazing on spider (araneae) biodiversity in a highland savanna ecosystem, in Laikipia, Central Kenya." Thesis, Rhodes University, 2005. http://eprints.ru.ac.za/109/.
Повний текст джерелаBuisson, Laetitia. "Poissons des rivières françaises et changement climatique : impacts sur la distribution des espèces et incertitudes des projections." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT005A/document.
Повний текст джерелаClimate change and its impact on biodiversity are receiving increasing attention from scientists and people managing natural ecosystems. Indeed, climate has a major influence on the biology and ecology of fauna and flora, from physiology to distribution. Climate change may thus have major consequences on species and assemblages. Among freshwater ecosystems, stream fish have no physiological ability to regulate their body temperature and they have to cope with streams' hydrological variability and strong anthropogenic pressures. Yet their response to current and future climate change has been poorly studied. The aim of this PhD thesis is to assess the potential impact of climate change on fish in French streams, mainly on species distribution and assemblages' structure. Data provided by the Office National de l'Eau et des Milieux Aquatiques combined with a modelling approach based on species' ecological niche (i.e., distribution models) have been used. Several sources of uncertainty have also been considered in an ensemble modeling framework in order to account for the variability between projected impacts and to provide reliable estimates of such impact. First, we have identified the main environmental factors that determine the spatial distribution of fish species within river networks. Overall, it appears that a combination of both climatic variables and variables describing the local habitat and its position within the river network is important to explain the current species distribution. Moreover, each fish species responded differently to the environmental factors. Second, we have highlighted that the choice of the statistical method used to model the fish ecological niche is crucial given that the current and future patterns of distribution predicted by different statistical methods vary significantly. The statistical method appears to be the main source of uncertainty, resulting in more variability in projections than the global circulation models and greenhouse gas emission scenarios. The variability between predictions from several statistical methods can be taken into account by a consensus approach. Consensual predictions based on the computation of the average of the whole predictions ensemble have achieved accurate predictions of the current species distribution and assemblages' composition. We have therefore selected this approach to assess the potential impacts of climate change on fish in French streams at the end of the 21st century with the highest degree of confidence. We have found that most fish species could be sensitive to the future climate modifications. Only a few cold-water species (i.e., brown trout, bullhead) could restrict their distribution to the most upstream parts of river networks. On the contrary, cool- and warm-water fish species could colonize many newly suitable habitats and expand strongly their distribution. These changes of species distribution could lead to a rearrangement of fish assemblages both at the taxonomic and functional levels. An increase in local diversity together with an increase in regional similarity (i.e., homogenization) are therefore expected. All these results bring new insights for the understanding of stream fish species distribution and expected consequences of climate change. This work thus provides biodiversity managers and conservationists with a basis to take efficient preservation measures. In addition, methodological developments considered in this PhD thesis are an important contribution to the improvements of projections by statistical models of species distribution and to the quantification of their uncertainty