Dissertations / Theses on the topic 'Lichens'
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Johansson, Per. "Effects of habitat conditions and disturbance on lichen diversity : studies on lichen communities in nemoral, boreal and grassland ecosystems /." Uppsala : Dept. of Conservation Biology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200606.pdf.
Full textDenoeud-Valdeyron, Marie-Laure. "Les lichens, bioindicateurs de pollution atmospherique : application aux alentours de l'usine roquette a lestrem." Lille 2, 1992. http://www.theses.fr/1992LIL2P020.
Full textMATHEY, ANNICK. "De in situ lichenum investigatione de l'analyse in situ des lichens." Paris 6, 1987. http://www.theses.fr/1987PA066744.
Full textChu, Fung Joanna. "Ecology of supralittoral lichens on Hong Kong rocky shores /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18735526.
Full textHögnabba, Filip. "Phylogenetic studies of cyanobacterial lichens /." Helsinki : Yliopistopaino, 2007. http://ethesis.helsinki.fi.
Full textCarter, Nick. "Bioprotection explored : lichens on limestone." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396154.
Full textHogan, Erika. "Nitrogen-phosphorus relationships in lichens." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10906/.
Full textMcDaid, Ann. "Chemical characterisation of Irish lichens." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282253.
Full textCaldiz, Mayra S. "Diversity and growth of epiphytic macrolichens in northwestern Patagonian Nothofagus forests /." Alnarp : Swedish University of Agricultural Sciences, 2005. http://diss-epsilon.slu.se/archive/00000831/.
Full textThesis documentation sheet inserted. Appendix reproduces four papers and manuscripts, three co-authored with others. Includes bibliographical references. Also partially available electronically via World Wide Web in PDF format; online version lacks appendix.
Dahlman, Lena. "Resource aquisition and allocation in lichens." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-115.
Full textLines, Catherine Elizabeth Mary. "Studies in the biology of lichens." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238171.
Full textGirard, François. "Remise en production des pessières à lichens de la forêt boréale commerciale : nutrition et croissance de plants d'épinette noire trois ans après traitements de préparation de terrain /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2004. http://theses.uqac.ca.
Full textSalix, Jessie Lynn. "Lichens and their distribution in Lewis and Clark Caverns State Park." Thesis, Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/salix/SalixJ04.pdf.
Full textLõhmus, Piret. "Forest lichens and their substrata in Estonia /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/918/5/lohmus.pdf.
Full textSmith, Elizabeth. "Carbon accumulating mechanisms in lichens and bryophytes." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282765.
Full textUcrospoma, Jara Marisa. "Ramalina (Lichens) en los parques de Lima." Pontificia Universidad Católica del Perú. Centro de Investigación en Geografía Aplicada, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/119300.
Full textKoopmann, Ricarda. "Allelopathic effects of bark phenols on epiphytic lichens." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=977662861.
Full textPaul, Alexander. "Manganese as a site factor for epiphytic lichens." Doctoral thesis, [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/paul.
Full textWood, Louise. "Photosynthetic characteristics of free-living phycobionts from lichens." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299048.
Full textLessard, Martine. "Caractérisation des produits naturels odorants retrouvés dans les lichens de genre usnea et bryoria de la région du mont Apica, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1990. http://theses.uqac.ca.
Full textWelch, Anthony Richard. "The effect of anthropogenic nutrient addition on the growth and competitive abilities of Parmelia caperata, P. reddenda, P. saxatilis and Xanthoria parietina in Cornwall." Thesis, Open University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289005.
Full textHernández, Padrón Consuelo E. "Flora y vegetación liquénica epífita de los sabinares herreños /." Berlin : J. Cramer, 1987. http://catalogue.bnf.fr/ark:/12148/cb39980218f.
Full textIsmed, Friardi. "Phytochimie de lichens du genre Stereocaulon : étude particulière de S. Halei Lamb et S. montagneanum Lamb, deux lichens recoltés en Indonésie." Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00737382.
Full textMénard, Thierry. "Etude phytosociologique et écologique des peuplements lichéniques saxicoles calcifuges du sud-est de la France." Aix-Marseille 3, 1997. http://www.theses.fr/1997AIX30088.
Full textDahl, Wivecke. "Contribution à l'étude des métabolites secondaires chez les lichens fructiculeux Cladina stellaris et Cladina rangiferina /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.
Full textLättman, Håkan. "Description of spatial and temporal distributions of epiphytic lichens." Licentiate thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11561.
Full textLichens are, in most cases, sensitive to anthropogenic factors such as air pollution, global warming, forestry and fragmentation. Two studies are included in this thesis. The first is an evaluation of the importance of old oak for the rare epiphytic lichen Cliostomum corrugatum (Ach.) Fr. This study analysed whether C. corrugatum was limited by dispersal or restricted to tree stands with an unbroken continuity or the substrate old oaks. The results provide evidence that the investigated five populations in Östergötland, Sweden, of C. corrugatum exhibit substantial gene flow, an effective dispersal and a small genetic variation between the sites. Most of the genetic variation was within the populations. Thus, C. corrugatum is more dependent of the substrate old oaks, rather than limited by dispersal. The second study investigated possible range shift of some common macrolichens, due to global warming, from 64 sites in southern Sweden comparing the two years 1986 and 2003. The centroid of three lichen species had moved a significant distance, all in a north east direction: Hypogymnia physodes (L.) Nyl. and Vulpicida pinastri (Scop.) J.-E. Mattsson and M. J. Lai on the tree species Juniperus communis L. (50 and 151 km, respectively) and H. physodes on Pinus sylvestris L. (41 km). Considering also the non-significant cases, there is strong evidence for a prevailing NE direction of centroid movement.
Lättman, Håkan. "Description of spatial and temporal distributions of epiphytic lichens /." Linköping : [Department of Physics, Chemistry and Biology], Linköping University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11561.
Full textRönnqvist, Marie. "Long-term effects of nitrogen deposition on epiphytic lichens." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-72677.
Full textChu, Fung Joanna, and 朱鳳. "Ecology of supralittoral lichens on Hong Kong rocky shores." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31235712.
Full textOlsson, Therese. "Morphological traits in hair lichens affect their water storage." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-94897.
Full textLättman, Håkan. "Studies on spatial and temporal distributions of epiphytic lichens." Doctoral thesis, Linköpings universitet, Ekologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81433.
Full textIn the electronic version of this dissertation the Södertörn series Södertörn Doctoral Dissertation 72, ISSN 1652–7399, has been removed.
Rivaux, Emmanuel. "Les lichens : généralités, rôle comme bioindicateurs de la pollution." Paris 5, 1998. http://www.theses.fr/1998PA05P039.
Full textDORGELO, JAN. "La determination matricielle. Application a la systematique des lichens." Reims, 1991. http://www.theses.fr/1991REIMS007.
Full textCaruso, Alexandro. "Lichen diversity on stems, slash, and stumps in managed boreal forests : impact of whole-tree harvest /." Uppsala : Swedish University of Agricultural Sciences, 2008. http://diss-epsilon.slu.se/archive/00001675/.
Full textIncludes reprints of four papers and manuscripts co-authored with others. Includes bibliographical references. Also partially available electronically via World Wide Web in PDF format; online version lacks reprints of four papers and manuscripts.
Semadi, Ammar. "Effets de la pollution atmosphérique (pollution globale, fluorée et plombique) sur la végétation dans la région de Annaba (Algérie)." Paris 6, 1989. http://www.theses.fr/1989PA066455.
Full textDownward, Kenneth. "Relationships between surface crusts and erosion in the Tabernas Badlands, Almeria, S.E. Spain." Thesis, University of Wolverhampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325975.
Full textForbes, PBC, M. Thanjekwayo, JO Okokwo, M. Sekhula, and C. Zvinowanda. "Lichens as biomonitors for manganese and lead in Pretoria, South Africa." Fresenius Environmental Bulletin, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001756.
Full textHesse, Volker. "Epiphytic lichen diversity and its dependence on chemical site factors in differently elevated dieback-affected spruce stands of the Harz Mountains /." Berlin : J. Cramer, 2002. http://catalogue.bnf.fr/ark:/12148/cb41308907z.
Full textDailey, Rebecca N. "Toxicity of Xanthoparmelia chlorochroa and the lichen substance (+)-usnic acid in ruminants." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1798967551&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textSignoret, Jonathan Müller Serge. "Etude de la qualité de l'air en Lorraine-Nord par les lichens contribution en tant que bioindicateurs écologiques, bioaccumulateurs d'éléments chimiques et biomarqueurs du stress oxydant /." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2002/Signoret.Jonathan.SMZ0213.pdf.
Full textJackson, Heather Bird. "Distribution of chemistry and sexual fecundity in the lichenized-fungi, Xanthoparmelia cumberlandia and Xanthoparmelia coloradon︠sis on Boulder Mountain, Aquarius Plateau, UT /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd623.pdf.
Full textSuija, Ave. "Lichens and lichenicolous fungi in estonia: diversity, distribution patterns, taxonomy /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/810/5/suija.pdf.
Full textSnäll, Tord. "Distribution Patterns and Metapopulation Dynamics of Epiphytic Mosses and Lichens." Doctoral thesis, Uppsala University, Department of Evolutionary Biology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3904.
Full textThis thesis examines the relative importance of local conditions, dispersal and dynamics of the trees on epiphyte distribution patterns and colonization-extinction dynamics. Study species are the mosses Orthotrichum speciosum and O. obtusifolium, and the red-listed Neckera pennata. The thesis also includes an attempt to parameterize a model for a lichen metapopulation (Lobaria pulmonaria) in a dynamic landscape, based on only presence/absence data of the epiphyte and its host trees.
The results show that epiphyte colonization of trees is affected by both local conditions, and by connectivity to occupied trees. The positive effect of connectivity, implying a restricted dispersal range, was established by both demographic and genetic studies. The important local conditions were tree diameter and vitality, and shade. Local extinctions from trees occurred among small trees with low local epiphyte abundance, but more often, were the results of tree fall.
The observed importance of connectivity on epiphyte colonization agrees with the assumptions of the classic metapopulation model. However, the classic metapopulation model assumes that the landscape is static, and that local extinctions occur for stochastic reasons. The dynamics of epiphytes are different. A new conceptual model is therefore suggested, the patch-tracking metapopulation model. It differs from the classic metapopulation model in that it includes dynamics of the patches, and in that local extinctions only occur as patches are destroyed.
Simulations of the dynamics of N. pennata showed that its future metapopulation size will be overestimated unless the dynamics of the trees are accounted for. The simulation results further suggest that the dynamics of N. pennata can be characterised by the patch-tracking metapopulation model.
The attempt to parameterize the L. pulmonaria metapopulation model showed that more information are required for rigorous parameterization, preferably of the past historic fire regime.
Rudolphi, Jörgen. "Bryophytes, lichens and dead wood in young managed boreal forests /." Uppsala : Dept. of Ecology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200788.pdf.
Full textSnäll, Tord. "Distribution patterns and metapopulation dynamics of epiphytic mosses and lichens /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3904.
Full textMcIlroy, de la Rosa John Patrick. "The contradictory role of lichens in the weathering of limestone." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602500.
Full textMuofhe, Mmboneni Leonard. "Lichens as air pollution assays on the Western Cape coast." Bachelor's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/26102.
Full textCarpentier, Claudia. "Investigations phytochimiques de lichens soumis au stress de la nordicité." Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/27345.
Full textLe, Pogam-Alluard Pierre. "Analyses de lichens par spectrométrie de masse : déréplication et histolocalisation." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S056/document.
Full textLichens are self-sustaining symbiotic partnerships comprising a fungus associated with a green alga and/or a cyanobacteria. This consortium produces unique secondary metabolites that are endowed with various biological activities. To harness this privileged chemodiversity, innovative mass spectrometry techniques were developed in the course of this study to accelerate the dereplicative holdup through both a minimal sample preparation and a decrease of the time of analysis. Two approaches were considered during this work: DART-MS and LDI-MS and their adequacy for lichen dereplication was assessed on a vast array of samples encompassing a wide range of metabolites. Both of them facilitated complete chemical profiles, respectively from unprocessed lichen material and crude acetone extracts. Since TLC still enjoys a wide-spread popularity among lichenologists, the advantages offered by TLC-ESI-MS hyphenation were evaluated as well. A second part of this manuscript focused on the histolocalization of lichen metabolites. For this purpose, LDI mass spectrometry imaging studies were undertaken on the crustose lichen Ophioparma ventosa. The phytochemical investigation of this species afforded the isolation of six naphthopyranones from its apothecia, four of them being new molecules. LDI-MSI revealed the distribution patterns of all the main metabolites of this lichen, reaching a spatial resolution of 50 μm. Most interestingly, the distribution pattern of imaged metabolites within the thallus is highly organized and is related to their ecological relevance. Joint strategies combining histolocalization and genetic investigation of lichen symbionts separated using laser capture microdissection were also considered. As such, an investigation of the biosynthesis of mycosporine serinol within Lichina pygmaea dissociated symbionts was initiated. Further analytical strategies such as X-ray powder diffraction are introduced in this thesis that contains six publications and two drafts to be submitted
Gadéa, Alice. "Lichens et gastéropodes du Subantartique : écologie chimique et relations trophiques." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1B041/document.
Full textLichen-lichenivore interactions are mediated by the presence of metabolites in lichens, which may impact lichenivore food preferences. In the environmental context of the Subantarctic, with a low animal and “plant” biodiversity, the surprising lichen flora contributed to the success of a the only endemic subantarctic land Gastropod, Notodiscus hookeri. To better understand the snail-lichen interactions, we analyzed the food preferences of this lichenivore snail and tried to pinpoint key lichen traits modulating the trophic interaction. From observations and samplings realized on Possession Island (Crozet Archipelago, Terres Australes et Antarctiques Françaises), two decisive stages of the interaction were studied: (i) the snail feeding behavior in situation of nutritional choice, (ii) its gustatory response when facing isolated metabolites in no-choice situations. Preferential grazing of some lichen parts was linked to both secondary and primary metabolites concentrations. Intrathalline localization of metabolites was performed in three lichen species consumed by the snail and widespread on Possession Island (Argopsis friesiana, Pseudocyphellaria crocata and Usnea taylorii), using chromatographic and spectrometric techniques (LC-DAD-MS, GC-MS, microdissection coupled to LC-DAD-MS, DART-MS) and imaging mass spectrometry ((MA)LDI-MS). N. hookeri appears to be a generalist and opportunistic gastropod, feeding on most lichen species encountered. However, it is able to discriminate between lichen parts, preferentially grazing on parts with the highest nutrient value, in spite of the presence of potential deterrent secondary metabolites. We described several mechanisms helping snails to overcome the toxicity of some lichen metabolites. Snail feeding choices result in trade-off between benefits of absorbing appetent metabolites of high nutritive value and the cost of physiological processes (detoxification, cleavage and excretion) caused by the ingestion of deterrent metabolites. To conclude, three main key parameters might be relevant in future to study the interactions between lichens and lichenivores. They correspond to the nature, the histolocalisation and the content of secondary metabolites balanced by the amount of nitrogen along with sugars and polyols. Imaging techniques have provided a new and promising way to visualize the heterogeneous distribution within the thallus between these metabolites. The ratios of appetent/non appetent compounds are likely to play a major role in food selection by this land snail