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Dissertations / Theses on the topic 'Biodiversity networks'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Zala-Larman, Catherine Elizabeth. "Communication networks and the implementation of biodiversity strategies." Thesis, University of Hertfordshire, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247305.

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Fitzsimons, James Andrew Fitzsimons James Andrew. "The contribution of multi-tenure reserve networks to biodiversity conservation." Connect to this title online, 2004. http://tux.lib.deakin.edu.au/adt-VDU/public/adt-VDU20050817.103606/.

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Thesis (Ph. D.)--Deakin University, 2004.<br>Title from PDF title page (viewed on Aug. 23, 2005). Appendix 19 (p. 297-313): Attitudes and perceptions of land managers and owners in the Grassy Box Woodlands Conservation Management Network : a draft confidential report for the New South Wales National Parks & Wildlife Service. 2002. Includes bibliographical references.

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Fitzsimons, James Andrew, and mikewood@deakin edu au. "The contribution of Multi-tenure reserve networks to biodiversity conservation." Deakin University. School of Ecology and Environment, 2004. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050817.103606.

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A consistent and integrated approach to nature conservation across the landscape and regardless of tenure is widely recognised as essential in ensuring the effective conservation of biodiversity. 'Multi-tenure reserve networks', which incorporate public and private lands managed for conservation, are considered a means of achieving landscape scale conservation. Biosphere Reserves (BR) and Conservation Management Networks (CMN) are characteristic models in Australia. This thesis aims to evaluate the role of such networks in protecting biodiversity, specifically by: (1) analysing the spatial con

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Sundaravadivelu, Rathinasabapathy. "Interoperability between heterogeneous and distributed biodiversity data sources in structured data networks." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/18086/.

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The extensive capturing of biodiversity data and storing them in heterogeneous information systems that are accessible on the internet across the globe has created many interoperability problems. One is that the data providers are independent of others and they can run systems which were developed on different platforms at different times using different software products to respond to different needs of information. A second arises from the data modelling used to convert the real world data into a computerised data structure which is not conditioned by a universal standard. Most importantly t

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Joubert, Lize. "Disturbance factors related to conservation of biodiversity in large-scale ecological networks." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86261.

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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Globally, habitat transformation causes biodiversity loss, with the transformed matrix often affecting the disturbance regime in remnant natural patches. In South Africa, significant parts of the Indian Ocean coastal belt and grassland biomes have been transformed into commercial forestry plantations of alien trees, which are detrimental to local biodiversity. Consequently, large scale ecological networks (ENs) of remnant natural vegetation, maintained areas (e.g. firebreaks) and special landscape features (e.g. rocky outcrops a

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Hervé, Mathilde. "Mieux conserver la biodiversité en intégrant l'agriculture et en explorant les changements globaux dans l'aménagement du territoire." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0088/document.

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Les méthodes actuelles utilisées pour définir les enjeux de biodiversité peinent à prendre en compte : les espaces agricoles et les pratiques, à la fois réservoir et pression pour la biodiversité et les dynamiques spatiales et temporelles, modifiant l’occupation du sol et la présence, la qualité et la connectivité des habitats. Ce travail a pour objectif de proposer des solutions pour ces 2 aspects.Nous avons identifié des pratiques agricoles favorables à la biodiversité. Pour comprendre les enjeux liés au développement de ces pratiques, nous avons étudié des leviers pour leur mise en place. N

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Joubert, Lize. "Biodiversity value of grassland ecological networks in afforested areas, KwaZulu-Natal, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6465.

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Thesis (MSc)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The current biodiversity crisis requires creative initiatives for mitigating further biodiversity loss. The use of ecological networks (ENs) is such an initiative. The South African forestry industry recognizes that there is loss of biodiversity at the smaller patch scale, while attempting to mitigate this loss at the landscape scale by implementing largescale ENs. The aim of this study was to determine how representative grassland biodiversity in ENs are of similar habitat in a nature reserves (NR). The study was condu

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van, Schalkwyk Julia. "Biodiversity conservation in a fragmented landscape : arthropod assemblages in smaller corridors within a production landscape." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96752.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Habitat loss and fragmentation are major threats to global biodiversity. A cornerstone of traditional conservation involves setting aside land as formally protected areas (PAs). However, for effective biological conservation in the long term there needs to be connectivity between these PAs. When possible, improved connectivity can be achieved using natural corridors at a landscape scale. Even better is to establish a network of corridors and nodes in the form of ecological networks (ENs). ENs are currently being employed by comm

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Grafström, Amanda. "Hur biodiversitet på ekosystemnivå skiljer sig mellan olika habitat." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108429.

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Biodiversity can be described as the total variation of life forms, where diversity ranges from gene level up to the ecosystem level. The diversity can be calculated in a number of ways, and this study use one of these methods. In this study empirical food webs have been used and analyzed, where eleven characters are defined and used as parameters to calculate the Euclidean distances between food webs that describe the variation that may exist within classes of terrestrial, marine and freshwater habitats. The class who stood out and showed the greatest diversity at the ecosystem level was the

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Braga, Joăo. "Etude de la diversité spatiale des réseaux trophiques et ses implications pour la conservation." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAV069.

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Les espèces qui cooccurrent partagent plus que l'espace physique, elles partagent aussi des interactions biotiques. Les interactions trophiques sont un type particulier d'interactions antagonistes qui représentent le flux de biomasse d'une espèce proie vers son prédateur. Les réseaux trophiques, dans leur forme la plus simple, sont composés de producteurs, de consommateurs et de décomposeurs. En raison de la nature des interactions qui composent les réseaux trophiques, leur structure nous révèle les processus gouvernant l'assemblage des communautés, la distribution de la biodiversité, le fonct

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Goss, Jeremy R. "Human networks of tetrapod translocations in the Western Cape, South Africa: trends and potential impacts on biodiversity." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/12082.

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Includes abstract.<br>Includes bibliographical references.<br>Global trends show an increase in wildlife trade associated with the process of globalisation and increased international trade. In addition, biodiversity managers are increasingly turning to species translocations to achieve conservation goals. These human induced movements of wildlife have a number of potential impacts, one being the introduction of non-native species that may establish and become invasive. Although the underlying mechanisms are debated, it is accepted that invasive species are having detrimental effects on biodiv

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Goss, Jeremy R. "Human networks of tetrapod translocations in the Western Cape, South Africa: trends and potential impacts on biodiversity." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/12082.

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Includes abstract.<br>Includes bibliographical references.<br>Global trends show an increase in wildlife trade associated with the process of globalisation and increased international trade. In addition, biodiversity managers are increasingly turning to species translocations to achieve conservation goals. These human induced movements of wildlife have a number of potential impacts, one being the introduction of non-native species that may establish and become invasive. Although the underlying mechanisms are debated, it is accepted that invasive species are having detrimental effects on biodiv

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Marques, Lana Grasiela Alves. "Mapping and legal approaches to bioprospecting networks in Brazil." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12658.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>FundaÃÃo de Amparo Ã Pesquisa do Estado do CearÃ<br>Este trabalho tem como propÃsito realizar o mapeamento das redes de bioprospecÃÃo no Brasil e as abordagens legais que envolvem o acesso aos recursos genÃticos para fins de bioprospecÃÃo. A BioprospecÃÃo se tornou uma das principais discussÃes nos Ãltimos anos desde que a ConvenÃÃo sobre Diversidade BiolÃgica (CDB) reconheceu a soberania de cada paÃs sobre os recursos genÃticos localizados em seu territÃrio. Ainda, o

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Ferreira, Mariana Moreira. "Biodiversity and plant-pollinator interactions in native forest areas of Terceira Island (Azores)." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/23061.

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Neste trabalho avaliámos o impacto que a perturbação humana das comunidades da floresta nativa da ilha Terceira (Açores) tem sobre a riqueza específica e nas interações ecológicas entre plantas e polinizadores. Para o efeito selecionámos dois locais emparelhados (um bem conservado e outro degradado), em duas áreas de estudo (Lomba e Pico Galhardo) e analisámos a integridade das redes ecológicas planta-polinizador. Constatámos que nas áreas bem conservadas as interações são dominadas por espécies nativas, enquanto que nas áreas perturbadas, apesar da prevalência de plantas introduzidas, os poli

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Gkaraveli, Anthi G. "Forest conservation, expansion, restoration and management in a National Park : modelling ecology, suitability, biodiversity priorities, temporal and climate change using GIS and spatial data." Thesis, Bangor University, 2002. https://research.bangor.ac.uk/portal/en/theses/forest-conservation-expansion-restoration-and-management-in-a-national-park--modelling-ecology-suitability-biodiversity-priorities-temporal-and-climate-change-using-gis-and-spatial-data(76501537-4b60-449a-98a0-24a08d971599).html.

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When maintaining the biodiversity and ecological integrity of forests is a goal of management, a primary requirement is to assess the status, condition, conservation value of each forest, and change in forest conditions over time. GIS procedures were used here to compare different map-based surveys and look in detail at changes in woodlands of the Snowdonia National Park, North Wales, from 1970 to 2000. The maps from the 1970s and 1980s generated by Silsoe College did not compare well with the map from the 1990s produced by the Forestry Commission and no meaningful changes could be measured. T

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Taylor, Kevin. "Data requirements for the establishment of protected area networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0031/MQ64464.pdf.

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Wallin, Jakob. "Plant-pollinator networks in three habitats on a baltic island." Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-1009.

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Plant-pollinator networks have shown to be highly dynamic systems as species and interactions change in time and space. Few studies have incorporated several habitats in their network. In this work I investigate interacting plant and pollinator communities of three adjacent habitats at Gotska Sandön, an island in the Baltic Sea. The networks varied in size between the habitats, and the larger networks of the dune and meadow displayed both nested and modular structure while the smaller forest network was more randomly organised. We found species present in more than one habitat that connected t

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Baum, Julia. "The influence of location on the structure and functioning of private land conservation networks in the Western Cape province of South Africa." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23407.

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Protected areas are an important tool for biodiversity conservation. Statutory protected areas are, however, perceived to currently be insufficient in extent and functioning for achieving conservation goals. Conservation action on privately owned land plays an increasingly vital role in expanding the global conservation estate. Private Land Conservation Areas (PLCAs) exist with internal properties and external contexts and do not occur isolated in space and time. They can thus best be described as linked social-ecological systems. Little comprehensive work has yet been done concerning the stru

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Sorupia, Eden. "Transport networks and ecotourism destinations : the aim for sustainability /." Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00004015.

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Fründ, Jochen [Verfasser], Teja [Akademischer Betreuer] Tscharntke, and Stefan [Akademischer Betreuer] Vidal. "Pollinator biodiversity, functional complementarity and dynamic plant-pollinator interaction networks / Jochen Fründ. Gutachter: Teja Tscharntke ; Stefan Vidal. Betreuer: Teja Tscharntke." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://d-nb.info/104302851X/34.

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21

Prendergast, Kit Stasia. "Urban native bee assemblages and the impact of the introduced European honeybee on plant-pollinator networks in the southwest Australian biodiversity hotspot." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/84947.

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The thesis of Kit Prendergast addressed impacts of urbanisation and introduced honeybees on native bees in southwest Australia. Additionally, efficacy of bee survey methods were evaluated. The study found remnant bushland, with high proportions of native flora, was of greater importance for supporting native bee populations, species, and pollinator networks, compared with residential gardens. Honeybees occupied distinct positions in pollinator networks, and altered network properties, with context-dependent impacts on native bees.

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Peter, Hannes. "Diversity and Ecosystem Functioning : Redundancy and Resilience in Freshwater Bacterial Communities." Doctoral thesis, Uppsala universitet, Limnologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160780.

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Bacteria are immensely diverse and hold key-positions in essentially all biogeochemical cycles. In freshwater ecosystems, bacteria degrade and mineralize organic compounds, linking the pool of dissolved organic matter to higher trophic levels. Aware of the global biodiversity loss, ecologists have started identifying the relationship of diversity and ecosystem functioning. Central to this is the question if species can functionally replace other species, hence being functionally redundant. Functional redundancy might allow communities to maintain functioning when diversity is lost. Due to thei

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Kehinde, Temitope Olatayo. "Effects of vineyard management and landscape context on taxonomic diversity and interaction networks of flower-visiting insects in the Cape Floristic Region biodiversity hotspot." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17980.

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Thesis (PhD)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Both taxonomic diversity and diversity of species interaction networks are experiencing declines as a result of agricultural intensification at habitat and landscape scales. Reversing this trend is a key conservation issue, particularly for important functional groups such as flower-visiting insects and the networks within which they interact. This is of great concern in regions of high conservation priority such as the Cape Floristic Region (CFR), known for its high level of floral and faunal endemism and exceptional speci

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Silva, Juliana Saragiotto. "Métricas de análise de redes sociais e sua aplicação em redes de interação biológicas: metodologia de aplicação e estudos de caso." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-22052015-154651/.

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Diversos pesquisadores têm se utilizado do recurso de Redes de Interação na área de Biodiversidade para analisar o papel das espécies na estrutura da uma rede cujos fundamentos conceituais são os mesmos das Redes Sociais (como Facebook, LinkedIn, entre outras). Nesse sentido, algoritmos, métricas e recursos computacionais e estatísticos provenientes da área de Análise de Redes Sociais (Social Network Analysis SNA) são ferramentas importantes para endereçar/apoiar estudos com interações. Assim sendo, o objetivo desta tese é propor uma metodologia para aplicação das métricas de SNA em estudos

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Reisinho, David José Batista. "Reconstrução da rede trófica aquática da albufeira do Alqueva: uma abordagem bibliográfica." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/30070.

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A barragem do Alqueva foi construída para fornecer água à agricultura, indústria e às populações da região do Alentejo, influenciando, no entanto, a estrutura do ecossistema natural da região. Ao utilizar a presença de taxa aquáticos e de atributos funcionais, provenientes de bases de dados e artigos, esta tese visou inferir a rede ecológica da albufeira do Alqueva. As redes de interação, com 241 taxa recolhidos, desde mamíferos e aves, a invertebrados e algas, foram inferidas utilizando um método de correspondência de características funcionais, que permitiu excluir cerca de dois terços das i

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Najm, Leandro Halle. "Arquitetura orientada a serviços para aquisição de dados de experimentos em Weblab de abelhas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-26082011-141314/.

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Experimentos ambientais são fundamentais para entender os efeitos das mudanças climáticas, como o decréscimo de polinizadores encontrados na natureza. Esses experimentos devem ser compartilhados com uma metodologia integrada. Desenvolver e aplicar ferramentas de tecnologia da informação em diferentes áreas de pesquisa é primordial para melhorar processos de controle e análise de dados, sem requisitar que pesquisadores de outras áreas tenham conhecimentos avançados em tecnologias da computação. Para isso, é importante a utilização de uma infraestrutura de hardware e software aberta e disponível

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Araujo, Walter Santos de. "Padrões globais na estrutura e fragilidade de redes planta-herbívoro." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/4737.

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Submitted by Cláudia Bueno (claudiamoura18@gmail.com) on 2015-10-22T18:12:21Z No. of bitstreams: 2 Tese - Walter Santos de Araújo.pdf: 2149997 bytes, checksum: 6ada687150a99d08e94670136a570e65 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-10-23T10:19:17Z (GMT) No. of bitstreams: 2 Tese - Walter Santos de Araújo.pdf: 2149997 bytes, checksum: 6ada687150a99d08e94670136a570e65 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Made available in DSp

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Goulnik, Jérémie. "Étude fonctionnelle de la fonction de pollinisation entomophile en prairie permanente sous l'effet d'un gradient d'intensification agricole." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0297.

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Le déclin de la biodiversité et son impact sur le fonctionnement des écosystèmes sont un enjeu majeur du XXIème siècle. L’agriculture intensive est aujourd’hui considérée comme l’un des facteurs responsables de ce déclin, suscitant une volonté sociétale pour une transition vers l’agroécologie. Celle-ci vise à intégrer les fonctions écologiques dans la production des biens agricoles. Les prairies permanentes sont au cœur de ces enjeux, étant à la fois essentielles pour l’alimentation du bétail, tout en pouvant abriter une forte biodiversité. L'intensification des pratiques agricoles peut modifi

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Loraamm, Rebecca Whitehead. "Road-based Landscape Metrics for Quantifying Habitat Fragmentation." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3214.

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Landscape metrics measure the composition and configuration of habitats within landscapes; often the goal is to measure fragmentation. While a variety of existing metrics characterize the connectivity and contiguity of habitat patches, most do not explicitly consider the fragmenting effects of roads in their formulations. This research develops a set of new landscape metrics that explicitly quantify how roads disconnect and break apart habitat patches. This research introduces the following four metrics to consider the fragmenting effects of transportation networks: (1) Number of Connected Pat

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Shih, Wan-Yu. "Optimising urban green networks in Taipei City : linking ecological and social functions in urban green space systems." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/optimising-urban-green-networks-in-taipei-city-linking-ecological-and-socal-functions-in-urban-green-space-systems(eca36d35-4470-4fdf-a766-ba9eebe5ca63).html.

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With the global population becoming more urban and less rural, increasingly research has argued for concepts such as establish Green Infrastructure (GI) as a tool for enhancing wildlife survival and human’s living quality (e.g. Harrison et al., 1995; Benedict and McMahon, 2006). However, an interdisciplinary planning approach underpinned by ecological and social evidence has not yet been fully developed. This research therefore seeks to integrate an ecological network with a green space planning standard by exploring the use of biotope and sociotope mapping methods. Seeking a comprehensive pla

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Suby, Carl. "Representative Biodiversity: The Ecosystem of Cartoon Network." Chapman University Digital Commons, 2019. https://digitalcommons.chapman.edu/film_studies_theses/4.

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As a capitalist organism the television program, as explained by Todd Gitlin, uses its slant to sell itself to advertisers with similar leanings on contemporary social issues to maintain its flow of revenue. However, this concept of slant does not account for the broader network, which, like the singular program, cultivates a catalog of programming into a singular slanted message becoming an ecosystem of shows relying on each other to maintain viewership. The successful televised ecosystem will then be home to programs who enjoy long runs and display an easily recognized shared slant. As an ex

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Boisvert, Étienne. "Îlots boisés en terre de grande culture : relictualité et biodiversité, l’exemple du Vexin français. Essai de biogéographie historique." Thesis, Paris 4, 2010. http://www.theses.fr/2010PA040147.

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L’objectif est de distinguer les îlots boisés relictuels des néoformés dans une matrice agricole, de les recenser avant de les caractériser et d’évaluer leur biodiversité et pour finir d’en tirer un modèle. La méthode associe le recours aux archives et aux photographies aériennes à l’enquête de terrain (1996-2007). L’approche cartographique s’est faite par analyse régressive (2004-1620). Le seuil temporel permet de reconnaître 152 îlots (<50ha) dont l’existence est attestée avant 1620. L’analyse régressive s’appuie sur le réseau viaire, élément fixe et structurant du paysage, pour cartograp

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Vincent, Flora. "Diatom interactions in the open ocean : from the global patterns to the single cell." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB094/document.

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Les diatomées sont des micro-algues unicellulaires, qui jouent un rôle primordial dans l’eco-système marin. En effet, elles sont responsables de 20% de l’activité photosynthétique sur Terre, et sont à la base de la chaîne alimentaire marine, toujours plus menacée par le changement climatique. Les diatomées établissent diverses interactions microbiennes avec des organismes issus de l’ensemble de l’arbre du vivant, à travers des méchanismes complexes tels que la symbiose, le parasitisme ou la compétition. L’objectif de ma thèse a été de comprendre comment ces interactions structurent la communau

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Crouzat, Emilie. "Etude des compromis et synergies entre services écosystémiques et biodiversité : Une approche multidimensionnelle de leurs interactions dans le socioécosystème des Alpes Française." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENV002/document.

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Dans un contexte de changement climatique global et d'évolution locale de l'usage des terres, le devenir des paysages culturels des Alpes françaises, façonnés au cours des siècles par les interactions mutuelles entre sociétés et environnement, apparaît incertain. Dans le même temps, les écosystèmes qui les constituent abritent une biodiversité riche et sont à l'origine de nombreuses ressources naturelles et fonctions écologiques dont bénéficient les populations humaines. Ces ressources et fonctions sont conceptualisées sous le terme de « services écosystémiques » et font aujourd'hui l'objet d'

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Botella, Christophe. "Méthodes statistiques pour la modélisation de la distribution spatiale des espèces végétales à partir de grandes masses d’observations incertaines issues de programmes de sciences citoyennes." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS135.

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L'expertise botanique humaine devient trop rare pour fournir les données de terrain nécessaires à la surveillance de la biodiversité végétale. L'utilisation d'observations botaniques géolocalisées des grands projets de sciences citoyennes, comme Pl@ntNet, ouvre des portes intéressantes pour le suivi temporel de la distribution des espèces de plantes. Pl@ntNet fourni des observations de flore identifiées automatiquement, un score de confiance, et peuvent être ainsi utilisées pour les modèles de distribution des espèces (SDM). Elles devraient permettre de surveiller les plantes envahissantes ou

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Fargeot, Christian. "La chasse commerciale en Afrique centrale : une menace pour la biodiversité ou une activité économique durable ? : Le cas de la république centrafricaine." Phd thesis, Université Paul Valéry - Montpellier III, 2013. http://tel.archives-ouvertes.fr/tel-00931537.

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En Afrique centrale, la chasse commerciale contribue fortement au ravitaillement en protéines des ménages en milieu villageois comme en milieu urbain. Elle est accusée de surexploiter la ressource faune, d'avoir un impact très négatif sur la biodiversité animale et sur la régénération forestière et de faire naître des risques importants de développement de maladies émergentes. A partir du cas centrafricain, nous voulons montrer que : la chasse commerciale s'inscrit dans une histoire longue, qui débute avec la colonisation européenne et se poursuit sans rupture, mais avec des acteurs différents

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Smith, Robert J. "Designing an integrated protected area network for Maputaland, South Africa." Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369671.

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Eriksson, Björn. "Diversity of ecosystems : Variation in network structure among food webs." Thesis, Linköpings universitet, Biologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130467.

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Biodiversity loss is one of the major threats to humanity. This has led to an increasing amount of research on biodiversity on genetic and species levels. Studies of diversity at the ecosystem level has however been neglected. An important aspect of ecosystems is food webs that describe the predation-prey interactions between species. Properties explaining the topological structure of food webs can be used to compare and highlight differences between ecosystems. In the present study, topological network properties are used to compare the diversity of network structures between groups of empiri

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Vieira, Gilles. "Etude de la diversité métabolique dans l'espèce Escherichia coli : a l'aide de réseaux et de modèles du métabolisme à l'échelle de l'organisme." Thesis, Evry-Val d'Essonne, 2011. http://www.theses.fr/2011EVRY0013/document.

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Il existe plusieurs façons de concevoir l’étude des différences métaboliques chez les microorganismes. On peut s’intéresser à des variations des capacités métaboliques des organismes. Derrière cette analyse se cache niveau d’étude à l’échelle la cellule qui permet d’avoir une vue d’ensemble des capacités de croissance de l’organisme dans différentes conditions. Dans cette thèse, nous proposons une nouvelle stratégie de reconstruction de réseaux et de modèles du métabolisme à l’échelle globale. Cette stratégie s’applique à un nombre quelconque d’organismes à condition qu’ils soient de la même e

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Tornero, Pinilla Irene. "Metacommunities and biodiversity patterns in Mediterranean temporary ponds: the role of pond size, network connectivity and dispersal mode." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/670096.

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We sampled the macrofaunal metacommunities in four networks of Mediterranean temporary ponds covering a wide range of pond sizes and different spatial extents. 1) In the smallest pond network, pond size was not related to any of the environmental factors and neither to community structure but had an effect on community composition. The effect of a high connectivity could explain the absence of differences in community structure. 2) Environmental distance had larger effects than spatial distance in the decay of community similarities. In the smaller network, the biotic groups showed different d

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Eriksson, Björn. "Biodiversity at the ecosystem level : structural variation among food webs in temperate and tropical areas." Thesis, Linköpings universitet, Biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108120.

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Biodiversity is a fundamental part of the functioning of ecosystems and their ability to provide ecosystem services. It has been shown that a high biodiversity increases the robustness of an ecosystem according to the insurance hypothesis. I propose that a similar effect can be seen on a higher scale, where a high diversity of ecosystem types might stabilize the ecological functionality of a region. By comparing eleven network characters in 70 tropical and temperate ecosystems, their diversity was measured as Euclidean distance between the systems in the 11-dimensional room defined by these ch

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Berkley, Nicholas Alexander James. "Patterns and process : biodiversity and ecosystem function response to changes in the arable landscape." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12825.

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Land use change is a major driver of species loss worldwide, the extent and intensity of agricultural land use poses particular pressures for biodiversity and the ecosystem services it provides. In recent years, agroecosystems have seen the introduction of 2nd generation bioenergy crops in order to tackle anthropogenic climate change, providing a renewable alternative to fossil fuels. In this thesis I study the impact of cultivating two commercial perennial energy crops (PECs), Miscanthus x giganteus and willow short-rotation coppice, when compared to the cereal crops they replace. I investiga

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Kreiser, Kilian. "SPAN (Special Protection Area Network) : A platform to protect bird protection areas." Thesis, Umeå universitet, Institutionen Designhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-72662.

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Background The foundation for life on our planet are all the resources we can draw upon: sunlight, clean water, fresh air and many more. But one existential resource a lot of people are not aware of, is the rich variety of life forms on earth. Biodiversity surrounds us every day: It is in the clothes we wear, the food we eat and the medicine we take. It is also an important driver for tourism, economy and technology: Various technological innovations are directly inspired by nature.But biodiversity is degrading rapidly caused by the rising land consumption in many countries. In Germany, this p

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Westfahl, Backlund Martina. "Implementation of the European network: Natura 2000 : Determined according to overarching EU directives or through compromising ecological aspects?" Thesis, Södertörn University College, School of Life Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-1794.

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<p>Global biodiversity is currently being lost at an unprecedented rate, posing a threat to vital ecosystems and hence the generation of ecosystem services that human society is entirely reliant upon. Within the European Community, the EU has set a target of halting biodiversity loss within the territory by 2010. This goal is intended to be operationalized by the implementation of the Habitats Directive and the Birds Directive. These directives constitute the framework for the establishment of a coherent ecological network, referred to as the Natura 2000 network.</p><p>This study examines and

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Lurgi, Rivera Miguel. "The assembly and disassembly of ecological networks in a changing world." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/133289.

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El ensamblaje, estructuración y funcionamiento de las comunidades naturales, compuestas de muchas especies que forman redes complejas de interacciones ecológicas, ha desconcertado a los ecólogos durante muchas generaciones. Investigación ecológica pionera determinó que el tamaño de la comunidad y su complejidad (medida como la conectividad en la red de interacciones ecológicas) limita la estabilidad de la comunidad, y por lo tanto impiden que las comunidades sean indefinidamente complejas o ricas en especies. Investigación

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Kohler, Yann. "Réseaux écologiques en régions alpines : une approche comparée de la mise en oeuvre d'un principe d'aménagement par la préservation." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENH013.

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Le concept de « réseau écologique » souligne l'importance de la connectivité écologique entre différents espaces naturels. Produit des évolutions historiques des pratiques de conservation et des nouvelles découvertes scientifiques, ce concept propose une nouvelle manière d'appréhender la protection de la nature. De nombreuses initiatives de « réseaux écologiques » ont ainsi lieu à travers le monde, notamment dans les Alpes. Elles témoignent de cette nouvelle conception de la protection de la nature, qui dépasse la simple conservation d'espèces pour s'orienter vers la préservation de systèmes é

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Zetterberg, Andreas. "Connecting the dots : Network analysis, landscape ecology, and practical application." Doctoral thesis, KTH, Miljöbedömning och -förvaltning, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48491.

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Humans have a profound impact on ecosystems, and land-use change constitutes a primary driving force in the loss of biodiversity. Habitat loss and fragmentation are key factors in this process by seriously impeding the habitat availability and movement of species, leading to a significant decrease in population viability. Landscape connectivity management able of crossing administrative and ecological spatial and temporal scales has been identified as one of the most important measures to counteract these negative impacts. The use of graph-theory and network-based landscape-ecological tools ha

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Maciejewski, Lise. "Reconnaissance et dynamique récente des habitats forestiers dans le contexte de la Directive Habitats-Faune-Flore." Electronic Thesis or Diss., Paris, AgroParisTech, 2021. http://www.theses.fr/2021AGPT0001.

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En 1992 en Europe, grâce à la Directive Habitats-Faune-Flore, les habitats naturels sont devenus des objets à conserver au même titre que les espèces, élargissant ainsi le domaine d’actions des politiques publiques à un autre niveau d’organisation de la biodiversité. Mais la reconnaissance tardive de leur valeur de conservation, ainsi que des lacunes dans leurs définitions sont en partie responsables de l’absence de séries temporelles de données sur les habitats à l’échelle nationale. Cela limite notre capacité à surveiller et évaluer leur état de conservation, et à adapter les actions de cons

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Torné, Noguera Anna. "Spatial variablility of bee communities: from local assemblages to interaciton networks." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/305236.

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Els organismes es troben distribuïts heterogèniament seguint patrons espacials, els quals són conseqüència de varis factors biòtics i abiòtics. Un dels principals objectius de l’ecologia és entendre com les interaccions de les espècies amb altres organismes i amb l’ambient determinen els seus patrons de distribució. En aquesta tesi analitzem els factors que expliquen la variabilitat espaial de les comunitats d’abelles i de les xarxes d’interaccions associades a escala local. L’estudi s’ha dut a terme al Parc del Garraf, en una àrea de 32km2 amb una vegetació arbustiva mediterrània homogènia, s

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Ramsey, Morag. "The Wolf Dilemma : Following the Practices of Several Actors in Swedish Large Carnivore Management." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255145.

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The wolf is an endangered animal in Sweden and the issue of conserving the species is a polarizing one. Specific attention has been given to this issue in environmental social sciences with studies focusing on the divide between wolf support and opposition. These studies include looking at historical interactions with the wolf, contemporary attitudes about the issue, and the way the law shapes policy. Following this focus on the disputed nature of wolf conservation, this thesis addresses whether polarization over the issue occurs between several stakeholders in large carnivore management in Sw

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