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Dissertations / Theses on the topic 'Functional biodiversity'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Deacon, Lewis James. "Functional biodiversity of grassland saprotrophic fungi." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408680.

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2

Dickens, Helen Elizabeth. "Functional attributes of biodiversity in decomposer communities." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326955.

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3

Zanettin, Giulia. "Effects of vineyard management on functional biodiversity." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422219.

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Italian vineyards are large-scale monocultures characterized by high pesticide pressure and removal of ecologically valuable structures. In the resulting highly disturbed and simplified systems, the insurgence of non-native species outbreaks can easier occur. In this framework, the preservation of semi-natural habitats and the adoption of more sustainable vineyard management practices are of particular importance in vineyard agro-ecosystems. In this thesis, the influence of vineyard management and landscape complexity on leafhopper species was investigated. Results shown that investigated fact

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4

Smith, Joanne. "Agri-environment schemes and soil biodiversity: assessing the conservation, biodiversity and functional value of arable field margins for soil macrofauna." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486322.

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5

McOwen, Chris. "The integration of phylogenetic and functional trait information into monocot biodiversity conservation." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3659.

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It is now widely acknowledged that a high proportion of the world's species are threatened with global extinction in the near future. Conserving all endangered species is impractical due to limited financial resources and manpower. Therefore, there is a real need to understand the mechanisms behind the extinction process in order to develop a proactive rather than reactive conservation strategy. Furthermore, given these limitations there is a need to be selective, prioritising species or areas not just on the basis of extinction risk or the number of species present, but with consideration for

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6

Marshall, Carolyn Bowers. "Effect of plant functional group removal on the soil microbial community diversity and composition." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2865.

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A major objective of biodiversity-ecosystem functioning (BDEF) research is to determine the consequences of species loss, caused both naturally and anthropogenically, on the functioning of ecosystems. The impact of plant species loss on the soil microbial community has not received much attention even though soil microbes influence many important ecosystem functions such as decomposition and nutrient cycling. The objective of this research was to investigate how the functional group composition of the aboveground plant community influenced the belowground microbial community. Plant functional

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7

Schäfer, Martina. "Mosquitoes as a Part of Wetland Biodiversity." Doctoral thesis, Uppsala universitet, Populationsbiologi, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4670.

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Wetlands contain both aquatic and terrestrial environments which generates high biodiversity. However, they are commonly associated with mosquitoes (Diptera: Culicidae), and mosquitoes are usually regarded as negative by humans because they can cause nuisance and transmit diseases. This thesis aimed to clarify the association between mosquitoes and wetlands and to achieve a more balanced view of biodiversity in wetlands by including mosquito diversity. Studies on adult mosquito diversity and assemblages were performed in 18 wetlands spread over Sweden. The Swedish mosquito species were organiz

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8

Campbell, Alistair J. "Functional agri-biodiversity : improving pest control and pollination services by means of multi-functional flower strips in cider-apple orchards." Thesis, Lancaster University, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.742532.

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Sown flowering strips can benefit beneficial arthropod groups (pollinators and natural enemies) on farmland and enhance the delivery of arthropod-mediated ecosystem services in crops. However, not all flowering plants may be useful for beneficial arthropod taxa, as differences in floral traits associated with nectar accessibility (e.g. nectar-holder depth) determine resource use. Therefore, increasing the number of distinct floral traits in flower mixes may be an effective way to manage multiple arthropod-mediated ecosystem services in farmland. Here, the response of pollinators and natural en

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9

Stecher, Anique [Verfasser]. "Functional biodiversity of sea ice-associated protists in the central Arctic Ocean / Anique Stecher." Konstanz : Bibliothek der Universität Konstanz, 2016. http://d-nb.info/1151075191/34.

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10

Wishart, Marcus J. "A comparative phylogeographic approach toward defining functional units for the conservation of biodiversity in lotic ecosystems." Connect to this title online, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031125.103610/.

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11

Hepner, Megan E. "Reef Fish Biodiversity in the Florida Keys National Marine Sanctuary." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7408.

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The biological diversity of reef-fish in the Florida Keys National Marine Sanctuary (FKNMS) from 1999 – 2016 was evaluated in terms of abundance, biomass, species richness, evenness, Shannon diversity, Simpson diversity, and functional diversity, using observations collected by multiple agencies and institutions under the Reef Visual Census (RVC) program. To compare the different diversity indices species richness, Shannon diversity, Simpson diversity, and functional diversity were converted into effective number of species. I examined the seven indices by no-take marine zo

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12

Dainese, Matteo. "Classification and biodiversity patterns in pastures of province of Trento." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3421544.

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In the Italian Alps, summer pastures are still managed in traditional ways, which maintain important grassland habitats of many species, although the number of pastures has declined drastically over the past few decades. Research on alpine pastures is important in many respects. From the aspect of nature protection, pastures represent a habitat for numerous plant and animal species; and, through their diversity, contribute greatly to the biodiversity and scenic value of the area. From the economic standpoint, grasslands are a source of feed for stock, a habitat for medicinal and melliferous pl

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13

Schmidtke, Andrea. "Biodiversity effects on the performance of terrestrial plant and phytoplankton communities." Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3893/.

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Die Ökosysteme unserer Erde sind durch das rasante Artensterben infolge von Umweltveränderungen durch den Menschen und des globalen Klimawandels stark betroffen. Mit den Auswirkungen dieses Artenverlustes und der damit einhergehenden Veränderung der Diversität beschäftigt sich die heutige Biodiversitätsforschung. Spezieller wird der Effekt der Diversität auf Ökosystemprozesse wie beispielsweise den Biomasseaufbau von Primärproduzenten oder der Resistenz einer Gemeinschaft gegen die Einwanderung neuer Arten untersucht. Die Quantifizierung des Einflusses der Diversität auf die Primärproduktion u

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14

Thiere, Geraldine. "Biodiversity and ecosystem functioning in created agricultural wetlands." Doctoral thesis, Högskolan i Halmstad, Våtmarkscentrum, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2968.

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This doctoral dissertation was produced in a cooperation between Halmstad University (Wetland Research Centre, School of Business and Engineering) and Lund University (Limnology & Marine Biology, Department of Ecology). Abstract . Wetland creation at large, regional scales is implemented as a measure to abate the biodiversity loss in agricultural landscapes and the eutrophication of watersheds and coastal areas by non-point source nutrient pollution (mainly nitrogen). The consequences of creating many new wetlands for biodiversity conservation and nutrient reten- tion (ecosystem functionin

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15

Nissimov, Jozef I. "Ecological and functional biodiversity in a marine algal-virus system : genotypes, phenotypes and their ecological significance." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13776/.

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Coccolithoviruses are large dsDNA viruses infecting the cosmopolitan calcifying marine phytoplankton Emiliania huxleyi. Therefore they are instrumental components of algal bloom demise and thus agents contributing significantly to biogeochemical cycling in the oceans. Several coccolithovirus strains exist in culture and have been used so far to study the co-evolutionary arms-race between them and their unicellular host in naturally occurring or induced blooms in the North Atlantic Ocean and the fjords of Norway. However, little is known of their distribution in non-bloom conditions, their natu

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16

Wishart, Marcus. "A Comparative Phylogeographic Approach Toward Defining Functional Units for the Conservation of Biodiversity in Lotic Ecosystems." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366626.

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The conservation of lotic ecosystems has historically focused on maintaining the structural properties and processes of river systems, considered as surrogates for the protection of biological diversity. However, the geological structure of the catchment unit and the hierarchical, longitudinal nature of the rivers that drain them impose a number of potential barriers to dispersal. This creates a mosaic of aquatic islands within a terrestrial landscape. As such the protection of biodiversity and biological processes requires considerations that extend beyond the catchment unit. Understanding th

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17

Magagnoli, Serena <1985&gt. "Functional Biodiversity in Different Agricultural Systems: Methods and Techniques for Conservation and Enhancement of Ecosystem Services." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/8075/1/Tesi%20dottorato%20Magagnoli%20Serena.pdf.

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The general aim of my PhD was focused on study the role of different agricultural systems in promoting functional biodiversity. In particular, the importance of habitat management techniques on natural enemy enhancement and conservation was considered at farm level with two-years samplings. Predation by polyphagous predators, which represents one of the most important ecosystem services in conservation biological control, was assessed using different approaches. In this context, molecular marker and artificial caterpillars (sentinel preys made by plasticine) were used to investigate the role o

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18

Gustafsson, Stina. "The Macroinvertebrate Community in a Nature-like Fishway with Habitat Compensation Properties." Licentiate thesis, Karlstads universitet, Avdelningen för biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-15116.

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Nature-like fishways are often constructed to restore connectivity in streams exploited for hydropower. They also have the potential to compensate for important habitats that have been degraded or lost. The aim of this thesis was to improve knowledge of the concept of nature-like fishway design, with special focus on their habitat compensation potential. This was done by comparing a nature-like fishway with four different habitat types, termed the biocanal, to six nearby natural reference creeks. In paper I the macroinvertebrate colonization of the biocanal was studied and the community compos

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19

Dommanget, Fanny. "Interactions entre espèces invasives et communautés végétales des berges de cours d’eau : vers l’utilisation du génie écologique dans la lutte contre les Renouées asiatiques." Thesis, Montpellier, SupAgro, 2014. http://www.theses.fr/2014NSAM0004/document.

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Les méthodes traditionnelles de gestion des renouées asiatiques (Fallopia spp.), plantes invasives parmi les plus menaçantes au monde, ont des résultats mitigés et coûteux. Certains gestionnaires s'orientent donc vers des solutions alternatives comme le génie végétal. Ordinairement utilisé contre l'érosion des berges de cours d'eau, il permet également d'installer un couvert végétal rapidement et durablement. Un des enjeux pour le contrôle des renouées asiatiques est donc d'optimiser ces méthodes afin de reconstituer des communautés végétales capables de les réguler. Ce travail de thèse tente

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20

Andersson, Martin. "Extent and limitations of functional redundancy among bacterial communities towards dissolved organic matter." Doctoral thesis, Uppsala universitet, Limnologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331772.

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One of the key processes in the carbon cycle on our planet is the degradation of dissolved organic matter (DOM) in aquatic environments. The use of organic matter by bacteria links energy from DOM to higher trophic levels of the ecosystem when bacteria are consumed by other organisms. This is referred to as the microbial loop. In this thesis I examined if the communities were functionally redundant in their ability to utilize organic matter, or if variation in bacterial composition and richness is of importance. To test this overarching question several experiments were conducted that include

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21

Buzzard, Vanessa, and Vanessa Buzzard. "Variation of Functional Traits Across Space and Time: Assessing the Roles of Succession and Temperature on Plant and Microbial Functional Traits to Understand Biodiversity Gradients." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625627.

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Traditionally, the study of biodiversity has focused on quantifying patterns of species diversity, or species richness, by simply counting the number of species across environmental gradients. This approach has been fundamental to ecological investigations and thinking with regards to identifying patterns of biodiversity. Although species diversity is the most commonly used dimension of biodiversity, species diversity alone does not provide a mechanistic understanding of biodiversity gradients. By also quantifying the genetic and phylogenetic diversity of a population, community or ecosystem,

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22

Tribot, Anne-Sophie. "Esthétique et biodiversité des écosystèmes sous-marins." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT131/document.

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La valeur esthétique des paysages et des espèces est un élément central de la conservation de la biodiversité, puisqu’elle fait intervenir les dimensions affectives et émotionnelles de notre rapport à la nature. Le lien entre biodiversité et perception esthétique demeure cependant peu étudié dans le cadre des services écosystémiques.Suite à un premier travail de synthèse ayant permis de poser les bases conceptuelles et méthodologiques de l’esthétique des paysages, trois études menées sur des systèmes sous-marins à différentes échelles ont permis de mieux comprendre et de quantifier le lien ent

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23

Treviño, Jessica Marie. "Effects of Macrophyte Functional Diversity on Taxonomic and Functional Diversity and Stability of Tropical Floodplain Fish Assemblages." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804900/.

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Multiple dimensions of biodiversity within and across producer and consumer guilds in the food web affect an ecosystem’s functionality and stability. Tropical and subtropical aquatic ecosystems, which are extremely diverse, have received much less attention than terrestrial ecosystems in regards to the effects of biodiversity on ecosystem functioning. We conducted a field experiment that tested for effects of macrophyte functional diversity on diversity and stability of associated fish assemblages in floodplain lakes of the Upper Paraná River floodplain, Brazil. Three levels of macrophyte fun

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24

Nygren, Cajsa. "Functional diversity in nutrient acquisition by ectomycorrhizal fungi /." Uppsala : Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200854.pdf.

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25

Heck, Marcela Georgia [Verfasser], and Kenneth Nigel [Akademischer Betreuer] Timmis. "Functional biodiversity of Pseudomonas species in biofilm communities degrading polycyclic aromatic hydrocarbons / Marcela Georgia Heck ; Betreuer: Kenneth Nigel Timmis." Braunschweig : Technische Universität Braunschweig, 2011. http://d-nb.info/1175826103/34.

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26

Knapp, Sonja. "Plant biodiversity in urbanized areas analyses of plant functional traits in space and time, plant rarity and phylogenetic diversity." Wiesbaden Vieweg + Teubner, 2009. http://d-nb.info/995192685/04.

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27

SIMONETTO, Anna. "Modelli quantitativi per l’analisi della biodiversità negli agroecosistemi." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2021. http://hdl.handle.net/11380/1239079.

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Nell’ultimo decennio, agenzie e istituzioni internazionali hanno emanato direttive e attivato linee di ricerca che sanciscono il ruolo chiave dal capitale naturale nella definizione delle strategie che promuovono l’agricoltura sostenibile. Esempi recenti di questi nuovi indirizzi di policy sono l’adozione della ‘Strategy on Mainstreaming Biodiversity across Agricultural Sectors’ , da parte della FAO, e della ‘Strategia sulla biodiversità per il 2030’ , da parte della Unione Europea, entrambe nel 2020. Da questi documenti si evidenzia la necessità di supportare l’adozione di pratiche agricole s

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28

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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29

Orgill, Katharine. "Evaluating the role of biodiversity, ecosystem services and real-world management in the restoration of wetlands in multi-functional landscapes." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16654/.

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30

Pu, Zhichao. "The assembly of protist communities: Understanding drivers of historical contingency and causes and consequences of biodiversity." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54901.

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Understanding mechanisms regulating the assembly of ecological communities is a major goal of community ecology. I combined experimental and theoretical approaches to investigate the influences of various ecological factors on the assembly of protist communities. My research included three experimental studies and one theoretical study. Two experimental studies used freshwater heterotrophic ciliated protists as model organisms to examine how species dispersal across local communities and functional and phylogenetic diversity of the species pool influence historical contingency of the assembled

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31

Denelle, Pierre. "Nature et signature de l'optimalité dans l'assemblage des communautés." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG018/document.

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Une combinaison phénotypique associée à une valeur maximale de taux de croissance démographique au niveau local définit une optimalité fonctionnelle locale. L’objectif de cette thèse est de comprendre le lien entre cette optimalité, les abondances et la coexistence des espèces au sein d’une communauté, à partir de données observées et d’approches de modélisation. Nous montrons en premier lieu que la moyenne fonctionnelle locale, pondérée par les abondances relatives des espèces, dépend de la distribution fonctionnelle régionale et dévie de l’optimalité fonctionnelle le long de gradients enviro

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32

Frainer, André. "Ecosystem functioning in streams : Disentangling the roles of biodiversity, stoichiometry, and anthropogenic drivers." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-82914.

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What will happen to ecosystems if species continue to go extinct at the high rates seen today? Although ecosystems are often threatened by a myriad of physical or chemical stressors, recent evidence has suggested that the loss of species may have impacts on the functions and services of ecosystems that equal or exceed other major environmental disturbances. The underlying causes that link species diversity to ecosystem functioning include species niche complementarity, facilitative interactions, or selection effects, which cause process rates to be enhanced in more diverse communities. Interfe

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33

Tripathi, Hemant Gangaprasad. "Biodiversity of the African savanna woodlands : how does it change with land use?" Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28965.

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The savanna woodlands of Southern Africa, colloquially termed the miombo, are poorly described in terms of biodiversity compared to other biomes. They have therefore been underrepresented in the wider understanding of how land use intensification is shaping global biodiversity. Land use change is known to reduce biodiversity and disrupt intactness of ecological communities with consequences for ecosystem functioning, resilience, and services. Miombo woodlands are described as biodiversity hotspots due to a high endemism of species and the presence of megafauna. At the same time, they are also

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34

Imran, Hafiz Ali. "Remote Sensing Tools for Monitoring Grassland Plant Leaf Traits and Biodiversity." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/329592.

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Grasslands are one of the most important ecosystems on Earth, covering approximately one-third of the Earth’s surface. Grassland biodiversity is important as many services provided by such ecosystems are crucial for the human economy and well-being. Given the importance of grasslands ecosystems, in recent years research has been carried out on the potential to monitor them with novel remote sensing techniques. Improved detectors technology and novel sensors providing fine-scale hyperspectral imagery have been enabling new methods to monitor plant traits (PTs) and biodiversity. The aims of the

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35

Maréchaux, Isabelle. "Individual-based modelling of tropical forests : role of biodiversity and responses to drought." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30244/document.

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La faible représentation de la biodiversité dans les modèles de végétation a longtemps été un obstacle à la compréhension et à la projection des processus écosystémiques. La forte biodiversité des forêts tropicales, leur rôle clé dans les cycles biogéochimiques globaux, ainsi que leur vulnérabilité aux perturbations anthropiques directes et indirectes, amplifient les difficultés et enjeux de ces questions de recherche. En particulier, l'augmentation prédite de la fréquence et de l'intensité des sécheresses pourrait impacter la structure et composition floristique de ces forêts, comme dors et d

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Pevere, Ines. "Effects of agricultural management and landscape on farmland biodiversity and associated ecosystem services." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424358.

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The next few decades will witness a rapidly increasing demand for agricultural products. By 2050 current food demand will be doubled by world population and socio-economic growth (FAO 2015). The expanding bio-based economy will increase the demand for agricultural products. Urban development will increasingly compete with agriculture for land use. The growing demand for agricultural products needs to be met largely through intensification (produce more from the same land surface) because there is little scope for an increase in agricultural area without doing irreparable damage to vital natura

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Combita, Heredia Jose Orlando. "Biodiversity, Systematic relationships, Ontogeny, and functional morphology of Mesostigmata mites (Acari: Parasitiformes) associated with dung beetles or found on soil of Tropical Regions." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1606743457287162.

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Perronne, Rémi. "Caractérisation de la structure fonctionnelle des communautés adventices dans les agroécosystèmes." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS041/document.

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Malgré de nombreux travaux menés, les mécanismes d’assemblage des espèces adventices en communautés restent à identifier. Or cette compréhension est cruciale pour concevoir des stratégies de gestion permettant de préserver la biodiversité des plantes adventices tout en maintenant la production agricole. Ce travail de thèse avait pour objectif de comprendre les mécanismes à la base de la structure fonctionnelle des plantes adventices dans les agroécosystèmes. Trois axes de recherche ont été menés. Le premier axe a permis de proposer un cadre d’analyse général des mécanismes d’assemblage à l’ori

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Mira, Eléonore. "Approche intégrée de la résistance à la sécheresse des arbres tropicaux : cas de la forêt sèche et de la forêt de nuage en Guadeloupe." Thesis, Antilles, 2016. http://www.theses.fr/2016ANTI0026/document.

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Dans le contexte actuel de changement climatique, anticiper la réponse des écosystèmes forestiers face à un risque de sécheresse accrue constitue un enjeu socio-économique, écologique et scientifique majeur. Les îles antillaises au-delà de leur statut de « hot spot de biodiversité », se situent dans un « hot-spot climatique », particulièrement à même d’être affecté par la réduction des précipitations. L’archipel Guadeloupéen constitue un modèle de choix dans l’étude des réponses végétales aux conditions environnementales. Il abrite l’ensemble de la diversité des écosystèmes caribéens, distribu

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Raffard, Allan. "Rôle écologique de la biodiversité intraspécifique en milieu aquatique." Thesis, Toulouse, INPT, 2019. http://oatao.univ-toulouse.fr/24405/1/Raffard_Allan.pdf.

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Le déclin actuel de la biodiversité a poussé un grand nombre d’études à s’intéresser aux relations entre la biodiversité et le fonctionnement des écosystèmes. La diversité intraspécifique est une facette centrale de la biodiversité qui permet aux espèces de s’adapter aux variations environnementales et dont l’importance écologique est de plus en plus examinée. A l’aide d’une méta-analyse synthétisant des données sur plusieurs espèces et écosystèmes, nous avons démontré qu’un changement de la diversité intraspécifique peut avoir des conséquences écologiques aussi fortes qu’un changement de la d

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TONELLI, MATTIA. "Effects of different pastures management on dung beetle communities in a sub-mountainous landscape of central Italy: a multicomponent biodiversity and ecological process analysis." Doctoral thesis, Urbino, 2017. http://hdl.handle.net/11576/2642392.

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TRINDADE, FILHO Joaquim. "Eficiência e consistência de grupos indicadores para a representação de diferentes aspectos da diversidade de vertebrados." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/2561.

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Made available in DSpace on 2014-07-29T16:21:17Z (GMT). No. of bitstreams: 1 Joaquim da Trindade Filho.pdf: 1763595 bytes, checksum: 0aca6a6973609450874af80da47b4e5c (MD5) Previous issue date: 2011-04-07<br>Here we report the performance and consistency of indicator groups to inform conservationists about possible conservation planning scenarios in the Brazilian Cerrado and the Atlantic Forest. We explore the performance and consistency (group with equal efficiency and greater than chance in both biomes) of indicator groups for 1) determining which species are excluded when certain indicator

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Martins, Rafael. "Composição e estrutura vegetacional em diferentes formações na floresta Atlântica, sul de Santa Catarina, Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/26296.

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Florestas pluviais tropicais, entre elas a Floresta Atlântica, são formações de elevada diversidade e riqueza o que as torna muito complexas. Elucidar os mecanismos que mantêm esta diversidade constitui o foco das abordagens ecológicas atuais. O objetivo do presente estudo, além de contribuir para o melhor conhecimento florístico-estrutural da Floresta Atlântica, foi o de avaliar as relações entre espécies e o ambiente, a partir da heterogeneidade florística em respostas a gradientes ambientais. O estudo foi conduzido em três formações florestais no sul Catarinense, compreendendo um fragmento

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Rice, Constance Elizabeth. "Examining the effects of plant diversity and community composition on reducing conditions in the soil of experimental wetlands." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243880360.

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Tolonen, K. (Katri). "Taxonomic and functional organization of macroinvertebrate communities in subarctic streams." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526217673.

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Abstract Ecological research based on both species and their traits help us to understand the main mechanisms and environmental factors structuring biological communities. In general, variation in community composition is thought to be a consequence of both stochastic and deterministic factors. In stream ecology, the traditional view has been that the local habitat conditions pose a strong environmental filter that selects only species with the right functional traits into the local communities. However, recent studies on streams have also suggested that the responses of species to environment

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Meiss, Helmut. "Diversifying crop rotations with temporary grasslands : potentials for weed mangement and farmland biodiversity." Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00575607.

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Crop rotation may be used to prevent the continuous selection of particular weed species adapted to one crop type. This might be useful for weed management, economy in herbicide applications and promoting biodiversity. Common simple crop sequences might be diversified by introducing perennial forage crops. Impacts of such perennial crops on weeds were studied with four approaches : 1) Large-scale weed surveys in 632 fields in western France showed that weed species composition differed most strongly between perennial alfalfa crops and annual crops. Comparisons of fields before, during and afte

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Joly, François-Xavier. "Tree diversity and litter decomposition in European forests." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS215.

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Les écosystèmes forestiers jouent un rôle clé en régulant des cycles du carbone (C) et des nutriments et l’érosion en cours de la biodiversité peut affecter ces fonctions écosystémiques. Ces deux dernières décennies, un effort de recherche important a cherché à comprendre comment la biodiversité affecte la productivité primaire. Le processus inverse de minéralisation du C pendant la décomposition de la matière organique est en revanche beaucoup moins étudié. Dans cette thèse, j’ai cherché à démêler les différents mécanismes par lesquels la diversité des arbres et de leurs litières foliaires af

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VESAL, SEYED EHSAN. "Variazioni spazio-temporali della comunità macrofaunale influenzata da scarichi fognari." Doctoral thesis, Università degli Studi di Trieste, 2021. http://hdl.handle.net/11368/2997277.

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Gli scarichi fognari, rappresentano un impatto antropico molto comune nelle area costiere, contribuendo ad un apporto elevato di sostanza organica con conseguente riduzione dell’ossigeno nella colonna d’acqua e nei sedimenti. Questi ultimi costituiscono un deposito della sostanza organica ed in alcuni casi anche di contaminanti che determinano l’esposizione di numerosi invertebrati bentonici a fattori di stress. Tra le comunità bentoniche costiere di fondo mobile, la macrofauna è coinvolta nei principali processi ecologici (pertanto) alterazioni ambientali che minacciano tali comunità, influis

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Delavat, François. "Composition et fonctionnement d'une communauté microbienne au sein d'un drainage minier acide : approches culturales et fonctionnelles." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00797981.

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Le drainage minier acide de Carnoulès est caractérisé par un pH très acide et une forte concentration en métaux et en arsenic. Par différentes approches moléculaires, des études précédentes ont montré une faible biodiversité et ont permis d'établir un modèle de fonctionnement de la communauté bactérienne. Le but de ce travail de thèse a été de préciser la composition et le fonctionnement de cette communauté bactérienne, en utilisant pour cela des approches culturales et fonctionnelles, en se focalisant particulièrement sur le recyclage de la matière organique. L'élaboration de différents milie

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Will, Christiane Verfasser], Rolf [Akademischer Betreuer] [Daniel, and Michael [Akademischer Betreuer] Hoppert. "Assessment of the functional diversity of soil microbial communities in the German Biodiversity Exploratories by metagenomics / Christiane Will. Gutachter: Rolf Daniel ; Michael Hoppert. Betreuer: Rolf Daniel." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1042528373/34.

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