Phytoplankton Communities in Temperate Rivers

dc.contributor.authorContant, Jacinthe
dc.description.abstractThe structure of phytoplankton communities was examined seasonally across five rivers with a focus on small cells and their relative importance. Picophytoplankton (0.2-2 μm), previously considered insignificant in rivers, reached densities as high as those observed in lakes and oceans (~ 10e4-10e5 cells/mL). Their relative importance was not a function of trophic state with the highest contribution to algal biomass found in the most eutrophic river. Body size distributions were analyzed from both chlorophyll-a size fractions and taxonomic enumerations; no significant effect of river or season was detected, suggesting that phytoplankton size distribution is not a useful metric of change in rivers. Unlike lake ecosystems, the rivers were uniformly dominated by small cells (< 20 μm). Taxonomic analyses of the seasonal succession did not reveal a common periodicity of particular divisions (e.g. diatoms). However, strong dominance was more typical of eutrophic rivers even though taxa richness was similar.
dc.publisherUniversité d'Ottawa / University of Ottawa
dc.subjectsize distribution analysis
dc.subjectseasonal succession
dc.subjectPicophytoplankton in rivers
dc.titlePhytoplankton Communities in Temperate Rivers
dc.faculty.departmentBiologie / Biology
dc.contributor.supervisorPick, Frances R
dc.embargo.terms1 year / Science / Science
uottawa.departmentBiologie / Biology
CollectionThèses, 2011 - // Theses, 2011 -