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Dissertations / Theses on the topic 'Spatial distribution pattern'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

鄺懿珩 and Yi-hang Agnes Kwong. "Spatial distribution pattern of murine CD34 mRNA+ cells in hematopoietic and lymphoid organs." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237174.

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Kwong, Yi-hang Agnes. "Spatial distribution pattern of murine CD34 mRNA+ cells in hematopoietic and lymphoid organs /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19471087.

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3

Wong, Ka Yiu. "Model-free tests for isotropy, equal distribution and random superposition in spatial point pattern analysis." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/202.

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This thesis introduces three new model-free tests for isotropy, equal distribution and random superposition in non-rectangular windows respectively. For isotropy, a bootstrap-type test is proposed. The corresponding test statistic assesses the discrepancy between the uniform distribution and the empirical normalised reduced second-order moment measure of a sector of fixed radius with increasing central angle. The null distribution of the discrepancy is then estimated by stochastic reconstruction, which generates bootstrap-type samples of point patterns that resemble the spatial structure of th

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4

Krawchuk, Margaret Annabelle. "Movement and distribution of three species of inquiline insects in boreal boglands, process and pattern at multiple spatial scales." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58427.pdf.

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5

MATSUDA, Yosuke, and 陽介松田. "Seasonal occurrence and spatial distribution of fruitbodies of ectomycorrhizal fungi on the border of a man-made and a naturally regenerated forest." 名古屋大学農学部付属演習林, 1994. http://hdl.handle.net/2237/8705.

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6

Zhao, Wanying. "Genetic, Age, and Spatial Structure to Improve Management of Common Privet (Ligustrum vulgare)." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325115045.

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7

Li, Yunning. "Identify the gas and solid flow structures within bubbling fluidized beds by using the PEPT technique." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/23652.

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Fluidized beds have been applied in many industrial processes (e.g. coal combustion, gasification and granulation) as an effective means for providing excellent gas and solids contact and mixing, as well as good heat transfer. Although research on the fluidized bed has been carried out for more than 70 years, uncertainties and difficulties still remain. These challenges exist primarily due to the complex and dynamic flow structure within fluidized beds and the lack of reliable measurement techniques. The positron emission particle tracking (PEPT) technique, developed at the University of Birmi

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8

Barber, Michael R. "Effects of Hydraulic Dredging and Vessel Operation on Atlantic Sturgeon Behavior in a Large Coastal River." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4792.

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The tidal James River, a focus of VCU's Atlantic Sturgeon program, supports both commercial shipping and hydraulic dredging. These anthropogenic threats present documented but preventable sources of mortality to the endangered species. Using three separate VEMCO Positioning System (VPS) receiver arrays, spatial data of previously-tagged fish were collected. ArcGIS and Programita software were used to analyze fish spatial distributions in the presence and absence of potential threats, using additional data including automatic identification system (AIS) vessel locations, vessel passages compile

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9

Bui, Manh Hung. "Structure and restoration of natural secondary forests in the Central Highlands, Vietnam." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216210.

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Introduction and objectives In Vietnam, the forest resources have been declining and degrading severely in recent years. The degradation has decreased the natural forest area, changed the forest structure seriously and reduced timber volume and biodiversity. From 1999 to 2005, the rich forest area has decreased 10.2%, whereas the poor secondary forest has increased dramatically by 20.7%. Forest structure plays an important role in forestry research. Understanding forest structure will unlock an understanding of the history, function and future of a forest ecosystem (Spies, 1998). The forest st

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10

Leung, Ngo-hei, and 梁傲晞. "Spatial dispersion patterns of Planaxis sulcatus: patterns and consequences." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48329502.

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Mobile, rocky shore species often exhibit distinct but dynamic spatial distribution patterns, such as the occupation of microhabitats and formation of aggregations. These patterns are likely to be influenced by the behavioural patterns of a species, their population dynamics and the consequent benefits of adopting particular patterns at certain times of the year. Using Planaxis sulcatus (Planaxidae) as a model species, this thesis documented spatial and temporal variation in the spatial patterns of this species, and attempted to identify the causes and consequences of these behaviours in the

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Magalhães, Simone Rodrigues de. "Fatores abióticos condicionantes da distribuição de espécies arbóreas em quatro formações florestais do Estado de São Paulo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-17062016-100308/.

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No estudo das comunidades florestais, estabelecer a importância relativa dos fatores que definem a composição e a distribuição das espécies é um desafio. Em termos de gradientes ambientais o estudo das respostas das espécies arbóreas são essenciais para a compreensão dos processos ecológicos e decisões de conservação. Neste sentido, para contribuir com a elucidação dos processos ecológicos nas principais formações florestais do Estado de São Paulo (Floresta Ombrófila Densa de Terras Baixas, Floresta Ombrófila Densa Submontana, Floresta Estacional Semidecidual e Savana Florestada) este trabalho

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12

Riding, Alison E. "Spatial patterns in woodland plants and soils." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296309.

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13

Coakley, Corrine. "Activity Space in a Terminal Classic Maya HouseholdXuenkal, Yucatan, Mexico." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1406544634.

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14

Peng, Renkang. "The influence of microclimate on the spatial distribution of flying insects." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293717.

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Manning, Jane Elizabeth. "Patterns of spatial variation : bacteria and tintinnids in the North Atlantic ocean." Thesis, Swansea University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678684.

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Li, Gaoxiang. "Spatial-Temporal Patterns of the Distribution of the Ethnic Minorities in China's Urbanization." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37077.

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Since the initialization of economic reforms in 1978, China has undergone significant urbanization and modernization at an increasingly rapid pace, with the national urbanization rate increasing from 17.9% in 1978 to 57.4% in 2016. An increasingly significant portion of China’s population is integrating itself into thriving urbanized areas. Though amounting to only 8.5% of the nation’s total population (1.5 billion), China’s ethnic minority population remains considerable in number. In the future, by adopting the National New-Type Urbanization Plan in 2014, China’s urbanization is expected to

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17

LaBlanc, Kelly Jo. "Using glacial dispersal patterns to understand the spatial distribution of subglacial quarrying." Cincinnati, Ohio : University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1185824410.

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Thesis (Ph. D.)--University of Cincinnati, 2007.<br>Title from electronic thesis title page (viewed Oct. 8, 2007). Includes abstract. Keywords: subglacial erosion, quarrying, glacial dispersal, Sawatch Range, Nova Scotia. Includes bibliographical references.

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LaBlanc, Kelly J. "USING GLACIAL DISPERSAL PATTERNS TO UNDERSTAND THE SPATIAL DISTRIBUTION OF SUBGLACIAL QUARRYINGDr." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185824410.

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19

Deblauwe, Vincent. "Modulation des structures de végétation auto-organisées en milieu aride." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210121.

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À l’échelle macroscopique, à savoir celle du paysage, la couverture végétale des milieux arides apparaît comme fortement hétérogène. Cette organisation spatiale des peuplements est habituellement attribuée aux processus de facilitation et de compétition qui opèrent à l’échelle microscopique des individus végétaux. Le qualificatif d’auto-organisées fut donc attribué à ces végétations qui se structurent en l’absence d’hétérogénéité préexistante du milieu physique. <p><p>L’auto-organisation de la végétation fut particulièrement bien étudiée dans le cas des structures périodiques connues dès les a

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20

Rodríguez-Gámez, Liz Ileana. "New Perspectives on the Spatial Analysis of Urban Employment Distribution and Commuting Patterns: the Cases of Hermosillo and Ciudad Obregon, Mexico." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/223344.

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Whereas no prior contribution has focused on the case of a medium-sized city in a developing country, such as Mexico, to explore how urban structure and its expansion has affected the spatial distribution of employment, three distinct, but related papers were developed, which combine urban economics literature and spatial sciences techniques to fill this gap and provide new evidence. The first paper, entitled "Spatial Distribution of Employment in Hermosillo, 1999 and 2004" identifies where employment subcenters are. Testing the presence of spatial effects, it concludes that an incipient proce

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21

Eslami-Andargoli, Leila. "Spatial Change in Subtropical Queensland Mangrove Distribution Related to Landscape and Rainfall Patterns." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/365787.

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In eastern Australia, the changing patterns of mangrove distribution are commonly associated with upslope encroachment into saltmarsh. This phenomenon could be related to climate change (e.g., change in precipitation, CO2 concentrations and sea-levels), as the result of human-induced changes in the wetlands and surrounding landscape or due to the interactions among these factors. This thesis investigated relationships between rainfall, land use, and landscape structure of selected wetlands in northern Moreton Bay, Queensland, Australia, from 1972 to 2004 over multiple temporal and spatial scal

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Tornés, Bes Elisabet. "Distributional patterns of diatom communities in Mediterranean rivers." Doctoral thesis, Universitat de Girona, 2009. http://hdl.handle.net/10803/7875.

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Aquesta tesi tracta la jerarquia i l'heterogeneïtat dels sistemes fluvials que afecten l'estructura de les comunitats bentòniques de diatomees. A nivell regional, es van buscar diferents grups de punts i les seves espècies indicadores, es va estudiar la resposta de les comunitats de diatomees als gradients ambientals, es va avaluar la utilitat de diferents índexs de diatomees i es va buscar el millor sistema de classificació per a condicions de referència. A nivell de conca, es volien definir els factors que determinen la distribució longitudinal de la diversitat de les comunitats de diatomees

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23

Rock, Amy Elizabeth. "Identifying the Spatial Distribution of Homelessness in Summit County, Ohio, using GIS." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1113832608.

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Hatten, Inger Suzanne. "The effects of urbanization on raccoon population demographics, home range, and spatial distribution patterns /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9999295.

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25

Deppe, Lorna. "Spatial and temporal patterns of at-sea distribution and habitat use of New Zealand albatrosses." Thesis, University of Canterbury. School of Biological Sciences, 2012. http://hdl.handle.net/10092/7610.

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Albatross populations are currently in decline around the world. Survival and reproduction of these large pelagic birds depends mostly on the conditions they encounter in their marine environment. Their ability to range far across ocean basins exposes them to a variety of anthropogenic threats. It is thus crucial to understand spatial and temporal patterns in the distribution and habitat use of each albatross species during different stages of their annual cycle in the context of seasonally changing demands as well as environmental constraints, in order to develop effective conservation measur

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Buckton, Sebastian Timothy. "Spatio-temporal patterns in the distribution and ecology of river birds." Thesis, Cardiff University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325005.

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27

Hammond, Laura. "Spatial patterns in serial crime : Modelling offence distribution and home-crime relationships for prolific individual offenders." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511060.

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28

Hijuelos, Ann C. "Spatial and Temporal Patterns in the Distribution, Behavior, and Activity of Fishes in Canals of the Everglades." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/778.

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Landscape characteristics, disturbances, and temporal variability influence predator-prey relationships, but are often overlooked in experimental studies. In the Everglades, seasonal disturbances force the spatial overlap of predators and prey, potentially increasing predation risk for prey. This study examined seasonal and diel patterns of fish use of canals and assessed predation risk for small fishes using an encounter rate model. I deployed an imaging sonar in Everglades canals to quantify density and swimming speeds of fishes, and detect anti-predator behaviors by small fishes. Generally,

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Walker, Susan Frances. "Spatial patterns in the distribution of Batrachochytrium dendrobatidis and outbreaks of fatal chytridiomycosis in European amphibian properties." Thesis, University of London, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498408.

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Aukema, Juliann Eve. "Dispersal and spatial distribution of the desert mistletoe, Phoradendron californicum, at multiple scales: Patterns, processes and mechanisms." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279776.

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Describing processes that lead to the distribution of parasites in space is important for understanding disease transmission and spread. Similarly, describing plant distribution patterns is important to understanding ecological processes. Indeed, distinguishing between dispersal and establishment limitation is central in plant ecology. Mistletoes allow doing both because they are plant parasites with clearly defined spatial distributions among hosts. Most mistletoes are dispersed by birds that consume mistletoe berries and defecate seeds onto host trees in a mutualistic relationship. I studied

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31

Martin, Camie Frandsen. "A Survey of Invasive Exotic Ants Found on Hawaiian Islands: Spatial Distributions and Patterns of Association." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3854.

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An intensive sampling of all ant species encountered on 6 Hawaiian Islands: Big Island, Maui, Oahu, Kauai, Molokai, and Lanai took place between 1988 and 1996. Species presence and absence was recorded at each site. Using remote sensing, variables were added insitu and used throughout my analysis. Species accumulation curves suggest that sampling was comprehensive. There is a significant trend between island area and species richness which validates the Theory of Island Biogeography for invasive species. Islands were found to be significantly nested by area, order, and tourism. Cluster analysi

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Depew, Jarrod Jason. "Habitat selection and movement patterns of cattle and white-tailed deer in a temperate savanna." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2616.

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This study investigated the use of high resolution satellite imagery in research involving habitat selection, and movement patterns of white-tailed deer and cattle in a semi-arid landscape. Vegetation classification was developed based on Ikonos satellite imagery that was then used to define habitat selection and characterize movement paths of deer and cattle to allow a better understanding of these 2 species. Pasture attributes were also measured to determine animal distribution throughout the study area in relation to roads, fences, water location, and supplemental feeders. Three cattle and

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FULTON, JOHN PATRICK. "A SPATIAL MODEL FOR EVALUATING VARIABLE-RATE FERTILIZER APPLICATION ACCURACY." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/248.

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The popularity of variable-rate technology (VRT) has grown. However, the limitations and errors ofthis technology are generally unknown. Therefore, a spatial data model was developed to generate "asapplied"surfaces to advance precision agricultural (PA) practices. A test methodology based on ASAEStandard S341.2 was developed to perform uniform-rate (UR) and variable-rate (VR) tests to characterizedistribution patterns testing four VRT granular applicators (two spinner spreaders and two pneumaticapplicators). Single-pass UR patterns exhibited consistent shapes for three of the applicators with

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Pokharel, Shankar Babu. "Remote Sensing and GIS Analysis of Spatial Distribution of Fracture Patterns in the Makran Accretionary Prism, Southeast Iran." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/geosciences_theses/8.

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This study shows that remote sensing and GIS are powerful tools in identifying geologically induced lineaments from digitally enhanced ETM+ satellite imageries and the digital elevation model (DEM) in remote areas such as the Makran accretionary prism, southeast Iran. The presence of the conjugate shear fractures in the eastern part, along with the extensional, and the presence of reidal sets associated with the subsidiary fractures of the Minab-Zendal fault system in the western part, suggests that the structural pattern changes from pure shear to simple shear from east to the west across the

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Szeghi, Shelley A. "Spatial Distribution and Assemblage Composition Patterns of Sherd-and-Lithic Artifact Scatters in the Upper Basin, Northern Arizona." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342730836.

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Creegan, Helen P. "Modelling the effects of changing habitat characteristics and spatial pattern on woodland songbird distributions in West and Central Scotland." Thesis, University of Stirling, 2005. http://hdl.handle.net/1893/48.

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This study investigated bird distributions in relation to local habitat and landscape pattern and the implications which habitat fragmentation may have for woodland birds. There were two sections to the research: an experimental study investigating bird gap crossing behaviour across distances of five to 120m; and an observational study modelling woodland bird distributions in relation to local habitat and landscape scale variables in two study areas (East Loch Lomond and the Central Scotland Forest). In the experimental study it was hypothesised that bird willingness to cross gaps will decreas

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Shea, Kwok-ho, and 佘國豪. "Species composition and temporal and spatial patterns in butterflyfishes (chaetodontidae) associated with coral communities insub-tropical Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42841513.

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Weerheim, Marieke S. "Distribution patterns and habitat use of black cockatoos (Calyptorhynchus spp.) in modified landscapes in the south-west of Western Australia." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2008. https://ro.ecu.edu.au/theses/126.

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Conservation planning for animal species inhabiting modified landscapes requires understanding of where animals occur and how they utilise both natural and modified habitats. In this study the distribution and foraging behaviour of the forest red-tailed cockatoo (Calyptorhynchus banksii naso), Baudin’s cockatoo (C. baudinii) and Carnaby’s cockatoo (C. latirostris) was investigated in three study areas which each contained a different combination of modified habitats. Pickering Brook contained native forest and orchards, Wungong contained a mosaic of native forest and revegetation, while Karnet

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Antão, Laura H. "Effects of ecological scaling on biodiversity patterns." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/13606.

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Biodiversity is determined by a myriad of complex processes acting at different scales. Given the current rates of biodiversity loss and change, it is of paramount importance that we improve our understanding of the underlying structure of ecological communities. In this thesis, I focused on Species Abundance Distributions (SAD), as a synthetic measure of biodiversity and community structure, and on Beta (β) diversity patterns, as a description of the spatial variation of species composition. I systematically assessed the effect of scale on both these patterns, analysing a broad range of commu

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Hakizimana, Paul. "Analyse de la composition, de la structure spatiale et des ressources végétales naturelles prélevées dans la forêt dense de Kigwena et dans la forêt claire de Rumonge au Burundi." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209727.

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Dans cette étude, la composition taxonomique, la structure spatiale et les ressources végétales naturelles prélevées dans les forêts de Kigwena et de Rumonge ont été analysées. Les deux forêts sont situées au Sud-Ouest du Burundi, dans une région de forte densité de population. L’objectif global de l’étude était d’élucider des éléments de l’écologie de la forêt dense de Kigwena et de la forêt claire de Rumonge en vue de leur conservation optimale. Les résultats montrent que les deux forêts sont floristiquement différentes malgré leur proximité géographique. Les types biologiques sont dominés p

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Bridge, S. R. J. "The landscape scale spatial distribution of vegetation gradients in a mixedwood boreal forest, linking ecological patterns to geomorphic processes across scales." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20820.pdf.

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Dolphin, Claire A. "Post Disturbance Coral Populations: Patterns in Live Cover and Colony Size Classes from Transect Studies in Two Oceans." NSUWorks, 2014. http://nsuworks.nova.edu/occ_stuetd/12.

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This study analyzes data acquired in French Polynesia in the Pacific and The Bahamas (Atlantic), both oceans affected by recent, well documented and sequential disturbances. For the purposes of this study, a disturbance is defined as a perturbation of environmental, physical or biological conditions that causes a distinct change in the ecosystem. After several decades of coral bleaching events, biological change, and anthropogenic impacts, rapid assessments of the coral community were accomplished by collecting photo-transects across the reefs to extract size structure of the corals, percent l

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Corbalán, García Maria Del Carmen. "Spatial distribution patterns of the sponge community in the Menorca Channel (Balearic Island), a new Marine Protected Area in the Western Mediterranean." Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/18226.

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O projeto INDEMARES produziu uma extensa base de dados obtida a partir das análises de 73 transectos de vídeo gravados com ROV e submersíveis tripulados durante os cruzeiros INDEMARES 3-‐4-‐5-‐6 e 0811 (período de 2010-‐2012) no Canal de Menorca, localizado entre as ilhas de Mallorca e Menorca. A informação proveniente dos transectos de vídeo foi processado e analisado pela equipa ICM durante os últimos anos. No âmbito da presente dissertação de mestrado, os dados sobre as várias espécies de esponjas foram processados com enfoque na distribuição espacial e batimétrica na plataforma e talud

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Garófano, Gómez Virginia. "Riparian vegetation patterns according to hydrogeomorphological factors at different spatial and temporal scales in Mediterranean rivers." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/29395.

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Los corredores riparios en ambientes semiáridos mediterráneos son ecosistemas de gran biodiversidad y complejidad. En ellos confluyen una gran variedad de perturbaciones naturales capaces de crear un mosaico espacial y temporal con pocos paralelos en otros ecosistemas. Sin embargo, a pesar de su valor, los ecosistemas riparios están amenazados debido a los altos niveles de intervención humana. La construcción de presas (y la consecuente manipulación del caudal) está considerada como la perturbación humana más importante que se cierne sobre ellos. Esta tesis ha tenido como objetivo an

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Dahlberg, C. Johan. "The role of microclimate for the performance and distribution of forest plants." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-129488.

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Microclimatic gradients may have large influence on individual vital rates and population growth rates of species, and limit their distributions. Therefore, I focused on the influence of microclimate on individual performance and distribution of species. Further, I examined differences in how microclimate affect species with contrasting distributions or different ecophysiological traits, and populations within species. More specifically, I investigated the performance of northern and southern distributed forest bryophytes that were transplanted across microclimatic gradients, and the timing of

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Sommeria-Klein, Guilhem. "From models to data : understanding biodiversity patterns from environmental DNA data." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30390/document.

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La distribution de l'abondance des espèces en un site, et la similarité de la composition taxonomique d'un site à l'autre, sont deux mesures de la biodiversité ayant servi de longue date de base empirique aux écologues pour tenter d'établir les règles générales gouvernant l'assemblage des communautés d'organismes. Pour ce type de mesures intégratives, le séquençage haut-débit d'ADN prélevé dans l'environnement (" ADN environnemental ") représente une alternative récente et prometteuse aux observations naturalistes traditionnelles. Cette approche présente l'avantage d'être rapide et standardisé

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Uittenbogaard, Adriaan Cornelis. "Crime Clusters and Safety in Underground Stations." Doctoral thesis, KTH, Fastigheter och byggande, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141168.

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The objective of the thesis is to explore ways to assess safety in an urban context and intransport nodes. The thesis is composed of articles which aim at assessing whether safety levels vary within a city, at a public transportation network, particularly at stations, and finally making suggestions to increase safety in these environments. The analysis makes use of Geographical Information Systems (GIS), statistical techniques and combines several different data sources. Fieldwork supports the data sources by presenting an investigation of the current environment at and around the underground

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Alahuhta, J. (Janne). "Patterns of aquatic macrophytes in the boreal region: implications for spatial scale issues and ecological assessment." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514295430.

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Abstract Eutrophication and global warming are increasingly causing deterioration of aquatic ecosystems, and boreal freshwaters are especially vulnerable to these changes. Anthropogenic pressures and landscape characteristics influencing the functioning and structure of ecosystems vary with spatial scale (grain size i.e. study unit and extent i.e. study area). This emphasises that the understanding of spatial scale is a vital element when studying species distribution patterns. Moreover, spatial scale is often neglected in ecological assessments, in which the degree of ecological integrity of

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Cornett, Virginia C. "Spatial distribution of submerged aquatic vegetation in the Shark River Estuary and implications for understanding movement and feeding patterns of manatees (Trichechus manatus latirostris)." FIU Digital Commons, 2006. http://digitalcommons.fiu.edu/etd/2641.

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The purposes of this study were to 1) characterize the distribution of submerged aquatic vegetation (SAV) in the Shark River Estuary, 2) determine water quality parameters driving distribution of SAV, 3) document the stable isotopic and elemental content of potential food sources for manatees, and 4) explore the utility of natural variability in isotope ratios of SAV in determining feeding patterns of manatees using isotopic compositions of manatee hairs as analytical tools. The marine/freshwater interface of the estuary was found to be the main factor driving SAV distribution. δ13C of manatee

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Hayn, Michael, Steffen Beirle, Fred A. Hamprecht, Ulrich Platt, Björn H. Menze, and Thomas Wagner. "Analysing spatio-temporal patterns of the global NO2-distribution retrieved from GOME satellite observations using a generalized additive model." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4499/.

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With the increasing availability of observational data from different sources at a global level, joint analysis of these data is becoming especially attractive. For such an analysis – oftentimes with little prior knowledge about local and global interactions between the different observational variables at hand – an exploratory, data-driven analysis of the data may be of particular relevance. In the present work we used generalized additive models (GAM) in an exemplary study of spatio-temporal patterns in the tropospheric NO2-distribution derived from GOME satellite observations (1996 to 2001)

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