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Dissertations / Theses on the topic 'Lichens'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

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.

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2

Denoeud-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.

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3

MATHEY, ANNICK. "De in situ lichenum investigatione de l'analyse in situ des lichens." Paris 6, 1987. http://www.theses.fr/1987PA066744.

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Le but de l'etude est de montrer, a partir d'exemples qu'il est possible de reunir des informations sur une plante (morphologie, anatomie, chimie et ecologie) sans creation d'artefact et de remplacer des donnees subjectives par des donnees mesurables, c'est-a-dire reproductibles. Les lichens constituent un modele biologique
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4

Chu, 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.

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5

Högnabba, Filip. "Phylogenetic studies of cyanobacterial lichens /." Helsinki : Yliopistopaino, 2007. http://ethesis.helsinki.fi.

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6

Carter, Nick. "Bioprotection explored : lichens on limestone." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396154.

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7

Hogan, Erika. "Nitrogen-phosphorus relationships in lichens." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10906/.

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Nitrogen enrichment promotes phosphomonoesterase (PME) activity in the common heathland lichen Cladonia portentosa. This is associated with a marked increase in thallus N:P mass ratio and significant up-regulation of inorganic phosphate uptake capacity, evidencing a shift from N-limited to P-limited growth. Phosphomonoesterase activity in C. portentosa responds rapidly to change in N deposition load, with a significant increase in activity recorded within 6 months of transplantation from a low-N to high-N site. The location of PME activity in C. portentosa was revealed using a fluorescent mark
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8

McDaid, Ann. "Chemical characterisation of Irish lichens." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282253.

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9

Caldiz, 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/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2005.<br>Thesis 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.
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10

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.

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11

Lines, 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.

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12

Girard, 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.

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13

Salix, 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.

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14

Lõhmus, Piret. "Forest lichens and their substrata in Estonia /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/918/5/lohmus.pdf.

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15

Smith, 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.

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16

Ucrospoma, 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.

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El presente trabajo consiste en realizar evaluaciones de la calidad de aire, mediante indicadores biológicos, como en el caso de Ramalina, líquen que habita las zonas urbano metropolitana de Lima (Ciudad capital), especialmente las áreas verdes en los distritos de Lince, Jesús María, San Isidro, parte de Pueblo Libre y Barranco. Ramalina vive en forma epifita, es decir, sobre los árboles tanto en cortezas de troncos y ramas. Para realizar la evaluación se colectó líquenes cortícolas en las áreas verdes de los distritos mencionados; luego se realizó cortes morfológicos para observar su estructu
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17

Lessard, 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.

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18

Koopmann, Ricarda. "Allelopathic effects of bark phenols on epiphytic lichens." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=977662861.

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19

Paul, Alexander. "Manganese as a site factor for epiphytic lichens." Doctoral thesis, [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/paul.

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20

Wood, 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.

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21

Welch, 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.

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22

Hernández, Padrón Consuelo E. "Flora y vegetación liquénica epífita de los sabinares herreños /." Berlin : J. Cramer, 1987. http://catalogue.bnf.fr/ark:/12148/cb39980218f.

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23

Ismed, 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.

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Des études morphologiques, phylogénétiques et des analyses phytochimiques ont été menées sur neuf espèces de lichens fruticuleux du genre Stereocaulon à partir d'échantillons provenant de zones tropicales (Indonésie, Île de la Réunion) et de zones tempérées (France, Italie). Les divers résultats et la comparaison des observations ont permis de préciser certains éléments pour la classification et la diagnose très délicate de ces lichens et de sélectionner deux espèces pour une analyse plus approfondie de leurs métabolites secondaires. L'étude phytochimique a été conduite sur S. halei et S. mont
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24

Ménard, 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.

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L'etude ecologique et phytosociologique des groupements de lichens saxicoles calcifuges de la partie meridionale du sud-est mediterraneen francais s'est revelee riche d'enseignements. L'analyse de transects par prelevement integral, technique nouvelle en lichenologie, permet l'etude fine des ecotones et la mise en evidence de gradients, en particulier d'humidite et de luminosite. Au point de vue phytosociologique, 145 releves, dont 139 effectues selon la methode du prelevement integral, permettent de distinguer 22 associations, sous-associations ou groupements, dont 8 sont nouveaux, qui se rep
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25

Dahl, 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.

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26

Lättman, 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.

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<p>Lichens 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 di
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27

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.

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28

Rönnqvist, 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.

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The main aim of this study was to analyse the long-term effects on epiphytic lichen dry mass development, diversity and community structure after exposure to a simulated nitrogen deposition gradient. A whole tree experiment was set up in a boreal forest in the County of Västerbotten in Sweden, whereby 15 trees were artificially irrigated and nitrogen fertilized during seven consecutive years (2006-2012). The treatments were equal to an additional deposition of 0.6, 6, 12.5, 25 and 50 kg N ha-1 yr-1. Branches from the trees were collected in October 2012 and the lichen material was harvested an
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29

Chu, 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.

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30

Olsson, 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.

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The aim with this study was to develop a method to estimate total area of hair lichens and to compare morphological traits and water storage in them. Hair lichens are an important component of the epiphytic flora in boreal forests. Their growth is primarily regulated by available water, and light when hydrated. Lichens have no active mechanism to regulate their water content and their water holding capacity (WHC, mg H2O/cm2) is thus an important factor for how long they remain wet and metabolically active. In this study, the water uptake and loss in five hair lichens (Alectoria sarmentosa, thr
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31

Lättman, 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.

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Lichens are an important group of organisms in terms of environmental issues, conservation biology and biodiversity, principally due to their sensitivity to changes in their environment. Therefore it is important that we develop our understanding of the factors that affect lichen distribution. In this thesis, both spatial and temporal distributions of epiphytic lichens at different scales have been studied in southern Sweden. Generation time of the red-listed lichen Cliostomum corrugatum was examined using Bjärka-Säby as the study site. The results showed that the average age of an individual
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32

Rivaux, Emmanuel. "Les lichens : généralités, rôle comme bioindicateurs de la pollution." Paris 5, 1998. http://www.theses.fr/1998PA05P039.

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33

DORGELO, JAN. "La determination matricielle. Application a la systematique des lichens." Reims, 1991. http://www.theses.fr/1991REIMS007.

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La determination d'echantillons a-typiques, ou appartenant a des groupes difficiles, au moyen des flores dichotomiques habituelles conduit generalement a des erreurs ou impasses. L'auteur propose une determination assistee par ordinateur au moyen d'un logiciel original fonctionnant sur i. B. M. Pc ou compatible. Les programmes comparent le specimen avec tous les taxa contenus dans une matrice taxa/caracteres et propose des noms par un classique calcul statistique de ressemblance. Les noms trouves sont generalement valables, meme quand l'echantillon est tres a-typique ou que l'utilisateur a fai
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34

Caruso, 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/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2008.<br>Includes 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.
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35

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.

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La région de Annaba (Est de l'Algérie) est soumise à une pollution atmosphérique intense et variée. L'utilisation des végétaux et notamment des lichens comme indicateurs biologiques a permis de préciser l'impact de la pollution globale, de la pollution fluorée et de la pollution plombique autour de Annaba. Ces trois aspects sont développés après la présentation des facteurs écologiques de cette région. L'observation des nécroses sur les feuilles de plusieurs espèces phanérogamiques et l'étude de la répartition des lichens ont permis d'établir une zonation de la pollution atmosphérique globale.
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36

Downward, 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.

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37

Forbes, 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.

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Abstract Parmotrema austrosinense (Zahlbr.) Hale lichens were collected from the Pretoria central business district (CBD), as well as three sites to the east of Pretoria; the National Botanical Gardens, the CSIR campus and the suburb of Lynnwood, with the aim of utilising these lichens as biomonitors of air quality to determine the effects of the phasing out of leaded petrol and the simultaneous introduction of manganese anti-knock additives to fuel in South Africa. In addition to lichens, roadside dust and soil samples were collected from the CBD and CSIR campus, and all samples were analysed
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38

Hesse, 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.

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39

Dailey, 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.

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40

Signoret, 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.

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41

Jackson, 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.

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42

Suija, 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.

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43

Snäll, 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.

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<p>This 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 <i>Orthotrichum speciosum </i>and <i>O. obtusifolium</i>, and the red-listed <i>Neckera pennata</i>. The thesis also includes an attempt to parameterize a model for a lichen metapopulation (<i>Lobaria pulmonaria</i>) in a dynamic landscape, based on only presence/absence data of the epiphyte and its host trees. </p><p>The results show that epiphyte colonization of trees is affected by both l
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44

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.

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45

Snäll, 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.

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46

McIlroy, 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.

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Experimental evidence suggests that coverage by certain lichens may actively reduce the rate of calcium loss from limestone surfaces subject to natural dissolution, through shielding by the thallus and the binding and waterproofing of the rock surface and subsurface by fungal hyphae. However, the subsequent decay of hyphae, induced by changes in microenvironmental conditions, necrosis, parasitism or the natural physiological traits of particular lichen species, may expose a chemically and physically weakened substrate to dissolution, triggering relatively rapid weathering-related calcium loss
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47

Muofhe, 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.

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A pollution survey was done in Milnerton industrial area along three transects, the coastal road, the R27 road, and the N7 road. In this project lichens were used as pollution monitors and their availability, abundance and percentage cover were used to estimate the level of pollution. Lichen specimens were collected from St. James, which is far from the pollution source and put in the vicinity of the Caltex oil refinery for four month after which they were analysed for their fluorescence and chlorophyll content. In all transects, lichen species richness and percentage cover increased with dist
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48

Carpentier, 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.

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Les lichens produisent une variété de métabolites secondaires de défense en réponse à un stimulus externe (intensité lumineuse, prédation, pathogène, conditions climatiques, etc.) afin de protéger les partenaires symbiotiques. Plusieurs activités biologiques sont associées à ces métabolites de défense : antitumorale, antipyrétique, anti-inflammatoire, antioxydante, antimycobactérienne, antimicrobienne et analgésique. Les décoctions de lichens étaient d'ailleurs utilisées en médecine traditionnelle pour traiter les maladies respiratoires (irritation de la gorge, toux, asthme et tuberculose), le
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49

Le, Pogam-Alluard Pierre. "Analyses de lichens par spectrométrie de masse : déréplication et histolocalisation." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S056/document.

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Les lichens, organismes symbiotiques associant un champignon et un partenaire photosynthétique (algue verte et/ou cyanobactérie), sont caractérisés par la biosynthèse de métabolites secondaires uniques dotés de bioactivités variées. Pour valoriser au mieux cette ressource privilégiée, des méthodes innovantes de spectrométrie de masse ont été développées dans le but de minimiser la préparation de l’échantillon et la durée des analyses. Deux techniques de spectrométrie de masse ont été évaluées en ce sens : le DART-MS et le LDI-MS. L’apport de chacune de ces deux méthodes a pu être établi sur un
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50

Gadéa, Alice. "Lichens et gastéropodes du Subantartique : écologie chimique et relations trophiques." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1B041/document.

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Les interactions « lichen-lichénophage » sont médiées par la présence de métabolites au sein des lichens qui peuvent influer sur les préférences alimentaires des lichénophages. Dans le contexte environnemental du Subantarctique, à faible biodiversité animale et « végétale », une étonnante richesse lichénique a contribué au succès de l’unique Gastéropode terrestre endémique, Notodiscus hookeri. Pour mieux comprendre les mécanismes en jeu, nous avons analysé les préférences alimentaires de cet escargot lichénophage et tenté de cibler les traits-clés des lichens qui modulent l’interaction trophiq
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