published_or_final_version / Botany / Master / Master of Philosophy

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1976. / Also available via the Internet.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1974. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph.D.)--McMaster University, 2002. / Advisor: Jurek Kolasa. Includes bibliographical references. Also available via World Wide Web.

Thesis (Ph.D.)--McMaster University, 2002. / Advisor: Jurek Kolasa. Includes bibliographical references. Also available via World Wide Web.

System requirements, Adobe Acrobat reader, Microsoft Power Point. / Includes bibliographical references (Leaves: [289]-291)

Made available in DSpace on 2015-03-05T16:19:36Z (GMT). No. of bitstreams: 0 Previous issue date: 26 / Programa Santander Universidades / Os ecossistemas lóticos apresentam um gradiente de variáveis ecológicas que se modificam da nascente até a foz, influenciando diretamente a sucessão da biota aquática. Em regiões temperadas os rios diferem-se daqueles localizados em regiões tropicais. Nas regiões tropicais o pulso de inundação exerce uma forte influência nas comunidades de macroinvertebrados. A distribuição e composição da comunidade de macroinvertebrados respondem às variações de fatores bióticos e abióticos e ainda, estão relacionadas com as diferentes regiões e tipos de hábitats disponíveis nos sistemas. Estudos relacionados à diversidade, estrutura e dinâmica de macroinvertebrados fornecem informações fundamentais para o conhecimento, acerca da biodiversidade e para programas de manejo e monitoramento dos recursos hídricos. Neste sentido o objetivo geral desta dissertação de mestrado foi conhecer a riqueza, a abundância, a composição e os grupos tróficos de macroinvertebrados, em nove arroios de pequena ordem em uma bacia hidrográfica do / Lotic ecosystems have a range of ecological variables that change from source to mouth, having direct influence on succession of aquatic biota. In temperate regions rivers are different from those located in tropical regions. In tropical regions the flood pulse has a strong influence on communities of macroinvertebrates. Distribution and composition of the community of macroinvertebrates respond to variations in biotic and abiotic factors and are related to different regions and types of habitat available in the systems. Studies on diversity, structure and dynamics of macroinvertebrates provide essential information on the biodiversity and for programs of management and monitoring of water resources. In this sense, the general objective of this master’s dissertation was to investigate the richness, abundance, composition and trophic groups of macroinvertebrates in nine small-sized streams in a hydrographic basin in southern Brazil and to analyze the influence of physical and chemical parameters of water and d

No description available.

The hypothesis that aquatic biomass is uniformly distributed over logarithmic size classes was evaluated with samples from epilimnetic plankton communities. Although the hypothesis is true for oligotrophic lakes, biomass increases between successive size classes in mesotrophic and eutrophic lakes. The abundance of organisms in logarithmic size intervals is strongly negatively correlated with size. The relationship between organism size and physiological performance in mixed communities was examined by testing the hypothesis that limnoplankton respiration rates are predictable functions of mean body size. The equation governing this relationship was found to be similar to those obtained with laboratory cultures. The total epilimnetic phosphorus concentration is correlated with both biovolume and respiration rate. Many limnological relationships, including those established in this thesis, are based on linear regressions between log-transformed variables. The rules for the correct use of backtransformed predictions are elucidated. A theorem is proven, which sets limits to the relationship between the coefficients of determination on the original and transformed scales. Simulated data and empirical results are used to illustrate the applications and limitations of the theoretical results.

Thesis (M.S.)--Ohio University, August, 2006. / Title from PDF t.p. Includes bibliographical references.