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This thesis has attempted to describe some of the distribution patterns of submerged aquatic macrophytes in Scottish lochs. Effort has been directed towards prescribing a precise lochs. Effort has been directed towards prescribing a precise meaning to productivity with respect to these plants to its measurement, and to investigating presible influencing factors. Using aqualung diving techniques, biomass estimates have been made in several lochs. These results have been viewed in two ways, (a) qualitatively and (b) quantitatively. Qualitative It has been that, in any one loch, there is a zonation of species with depth of water. Generally, Littorella uniflora/Lobelia dortmanna communities were dominant in the shallower water (up to one metre), while otamogeton species occupied the deeper areas (up to seven metres). Of the substrate variables investigated, no parameters have been shown to be causally correlated with the distribution of such factors was complicated by a high degree of variance in the biomass estimates of vegetation on fairly uniform substrates. Distribution patterns of species between lochs have also been noted. The members of the Characeas were only found in the limestone lochs of high pH and alkalinity, while Lobelia dortmanna and Isoetes lacustris were confined to the more base-poor waters. Litorella uniflora was found in all the Iochs studied. Only two species of broad-leaved, sub-merged pondwecds were found in the limestone lochs but, while these were not restricted to such habitats, other species of the genus Potamogeton were. No one factor has been shown to underlie this distribution pattern though, in the case of the Characeae, it would appear that the high alkalinity of the water is related to the predominance of some members of this family in the limestone lochs, where they can produce their calcium carbonate exoskeletons. It is also possible that the low concentration of phosphorus in the limestone waters, shown by others to be a maximum factor in the growth of the Characase, is also important, while the general low nutrient concentrations may exclude other species from these areas.

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Nitrogen (N) has traditionally been regarded as the primary limiting nutrient to algal growth in marine coastal waters, but recent studies suggest that phosphorus (P) can be limiting in carbonate-rich environments. To better understand the importance of P. alkaline phosphatase activity (APA) was measured in reef macroalgae in seven counties of south Florida ; several significant trends emerged : 1) APA decreased geographically from the highest values in Dada>Monroe>Palm Beach>St. Lucie>Broward>Martin>Lee counties 2) APA varied temporally with increasing nutrient-rich runoff in the wet season 3) APA varied due to taxonomic division Phaeophyta>Rhodophyta>Chlorophyta 4) Nutrient enrichment experiments demonstrated that increased N-enrichment enhanced P-limitation while increased P decreased P-limitation. These results suggest that high APA observed in carbonate-rich waters of Dade County and low APA in Broward County resulted from high nutrient inputs associated with anthropogenic nutrient pollution. / by Courtney Kehler. / Thesis (M.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Mode of access: World Wide Web. / System requirements: Adobe Reader.

Includes bibliographical references (leaves 235-258). Estimates the primary production and investigates the photosynthetic performance of temperate turfs at West Island, off the coast of South Australia. These communities play a fundamental role in reef ecology, being the main source of food for grazers, both fishes and invertebrates. Turfs also have an important function in benthic algal community dynamics, being the first colonizers on disturbed and bare substratum.

Includes bibliographical references (leaves 235-258). / xxi, 274 leaves, [8] leaves of plates : ill. (chiefly col.), map 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Estimates the primary production and investigates the photosynthetic performance of temperate turfs at West Island, off the coast of South Australia. These communities play a fundamental role in reef ecology, being the main source of food for grazers, both fishes and invertebrates. Turfs also have an important function in benthic algal community dynamics, being the first colonizers on disturbed and bare substratum. / Thesis (Ph.D.)--University of Adelaide, Dept. of Environmental Biology, 2002