The biology of the sub-aquatic lichen, Dermatocarpon luridum, was investigated. This lichen is sparsely distributed within the temperate climatic zones around the world, colonizing rock along watercourses that regularly experience water level fluctuations. Specimens collected from Canada and Austria were cultured using standard growth media. Brightfield microscopy was used for algal species identification, while fungal ITS, algal ITS and algal actin gene sequences were used for phylogenetic and population genetic evaluation. Results were: 1) axenic cultures of the photobiont were successful, while those of the mycobiont were not successful; 2) Diplosphaera chodatii is the photobiont associated with D. luridum var. luridum and allies, suggesting algal sharing between mycobiont species; 3) genetic diversity is high, and gene flow was high within local populations, but low between continental populations. Diplosphaera chodatii may be a keystone species contributing to the survival of D. luridum var. luridum along with other sub-aquatic, aquatic and terrestrial lichens.

Bibliography: leaves 180. / viii, 200 leaves : ill. ; 20 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This study shows the widespread nature of resistance in L. rigidum populations, the tendency to genetic dominance even in early generations of selection and the propensity to display resistance to many herbicides. The fitness of resistant plants and the likely failure of herbicides for weed management suggests that an Integrated Weed Management programme is the best solution. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1997

Thesis (M.A.)--University of Nevada, Reno, 2007. / "May, 2007." Includes bibliographical references (leaves 53-60). Online version available on the World Wide Web.

Thesis (Ph.D.) -- McMaster University, 1999. / Includes bibliographical references. Also available via World Wide Web.

Thesis (Ph.D.)--Murdoch University, 2004. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves 199-219.

Thesis (M.Sc.)--University of Western Australia, 2006.

Thesis (PhD)--Montana State University--Bozeman, 2008. / Typescript. Chairperson, Graduate Committee: Christopher S. Guy. Includes bibliographical references (leaves 135-150).

Thesis (M.S.)--University of Wyoming, 2007. / Title from PDF title page (viewed on Feb. 10, 2009). Includes bibliographical references.

Thesis (M.A.)--State University of New York at Binghamton, Anthropology Dept., 2007. / Includes bibliographical references.

Thèse (M.Med. Exp.) -- Université du Québec à Chicoutimi, programme extensionné de l'Université Laval, 2003. / Bibliogr.: f. [79]-83. Document électronique également accessible en format PDF. CaQCU