Bibliography: p. 125-138. / 149 p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / A number of life history traits were quantified for three species of Cystophora. The composition and dynamics of the community were monitored and related to temporal changes in the patterns of growth and reproduction of each species, and also to patterns of recruitment and early community development. / Thesis (Ph.D.)--University of Adelaide, Dept. of Environmental Biology, 2000

Thesis (Ph.D.) -- University of Adelaide, Dept. of Environmental Biology, 2000. / Bibliography: p. 125-138.

Bibliography: p. 125-138. A number of life history traits were quantified for three species of Cystophora. The composition and dynamics of the community were monitored and related to temporal changes in the patterns of growth and reproduction of each species, and also to patterns of recruitment and early community development.

Thesis (Ph. D.)--University of California, Los Angeles, 2003. / Vita. Includes bibliographical references.

No description available.

Algae are increasingly being used in human affairs. Alongside with higher volumes, threats for seaweed natural reservoirs and seaweed farming are starting to appear. Epidemics seems a key complication, similar to agriculture and animal aquaculture. However, phycopathologies are much more under documented, and future diseases are currently difficult to foresee. Thus, efforts should be stressed on biodiversity of algal pathogens and algal defense strategies against diseases. This thesis is divided in two parts: the first section comprises Chapters Two and Three, which describe novel algal pathosystems from cell biology and molecular phylogeny perspectives. Chapter Two characterizes the obligate parasite Maullinia braseltonii sp. nov., a phytomyxid infecting Durvillaea (bull kelp) in the Southern hemisphere. Chapter Three reports new records, cell plasticity and epidemiology of the endophyte Laminariocolax aecidioides infecting Lessonia berteroana (huiro negro) in northern Chile. The two hosts aforementioned have commercial importance, and remarkable roles in coastal ecology in temperate marine habitats in the Southern hemisphere. Chapters Four, Five and Six correspond to a second section and describe cellular processes in novel brown algal pathosystems, related with infection and immunity responses. In Chapter Four, using the Macrocystis/Anisolpidium as a model, microscopy evidence indicate that autophagy is a key cellular process used either to help starving pathogen syncytia to survive (controlled) or to kill themselves (abortive), probably induced by the host. Likewise, host autophagy was also widely observed and may be involved in the neutralization of early-stage oomycetes or nutrient recycling to mount defences. Chapter Five shows the results on a screening of ca. 40 strains from different brown algal orders, to phenotype cellular defense markers against two phylogenetic distant pathogens (Anisolpidium ectocarpii and Maullinia ectocarpii). Overall, responses such as cell wall re-arrangements, programmed cell death, autophagy and ROS accumulation were confirmed to be at least partially conserved across different Phaeophycean lineages. Chapter 6 reports a boost on the phlorotannin metabolism in the model brown alga Ectocarpus (e.g. physode formation and polyketide synthase gene expression) after pathogen challenging, suggesting a similar protective role of this molecule as against grazers and deleterious light regimes. Phlorotannins role however needs to be elucidated.

Thesis (Ph.D.)--University of Delaware, 2008. / Principal faculty advisor: Nancy M. Targett, College of Marine & Earth Studies. Includes bibliographical references.

A the'.is submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in the fulfillment of the requirements of the Degree of Magister Scientae. June 1992 / Aspects of the brown alga Pict~'ppt;eris lQ..n..qifolia at. Palm Beach, Natal, were investigated wi\'-;.hspecial reference to the effect of wave expozu~e~ A description of the species is giv~n and the nomencluture discussed. D~strib1i.ltion of n. ).or~gifolia was det~rmimad from literature and herbarium speof.mens . various r(\~:~thodosf measuring wave exposure were assessed and review~~d. At'!;:.emptswere made to quantify sand abrasion and deposition in tihe scudy si.tes. Morphological and structural aspect;s of the cha LLus were found to vary considerably with season and wave exposure" Light and scanning electron microscopy studie.s indicated the relatjvely complex cell organisation of this brown alga. The prolific regeneration from various thallus sections of .Q. longifolia indicate that regenerat.ion is an important survival strate 'JY following damage. Sexual reproduction and tetrasporogenesis were investigated. Sex.ual reproduction was not prolific in the field, however, tetraspores were abundant and are believed to be particul~rly importcmt in high wave exposure areas. 11. _j.Q.ngi;f'clige,x_periences a range of environmental conditions and responds to these with morphological, structural and reproductive &daptations.

Graduation date: 1997

The Feldmannia sp. virus is a large icosahedral virus that persistently infects marine brown alga Feldmannia sp.. So far, there is no information available about viral genome replication, gene structure and gene expression in this unique viral-host system. The purpose of this study was to characterize the general features of viral transcripts in the virus producing sporophyte plants. Northern analysis, using four cosmid clones that cover the entire viral genome, showed that there were six major transcripts and at least eighteen minor transcripts in the virus producing sporophyte plants. These transcripts are not evenly distributed in the viral genome. A 5.7 kb BamHI fragment-R was found to encode a 1.5 kb and a 0.9 kb major transcript, and those two major transcripts were chosen for detailed sequence analysis. The 1.5 kb transcript was identified as the putative major capsid protein (MCP) gene. The FsV MCP has significant similarity with the major capsid protein of Chlorella virus-PBCV-1 and with iridoviruses, fish lymphocystis disease virus, frog virus 3, and with African swine fever virus. / Graduation date: 1996