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Variation of Copper and Cadmium in Pelagic Plankton of Hamilton Harbour / Variation of Cu and Cd in Plankton of Hamilton HarbourKoenig, Brenda 04 1900 (has links)
Temporal variation in the levels of Cu and Cd in zooplankton, phytoplankton and water taken from five pelagic stations in Hamilton Harbour during three separate sampling periods (June, August and October/November 1990) was examined. Significant seasonal variation occurred in the Cu and Cd levels measured in water and phytoplankton (Cu Water: df=2, F=32.28, P≤.0001, Cu Phytoplankton: df=2, F=48.94, P≤.0001 and Cd Water: df=2, F=18.98, P≤.0001, Cd Phytoplankton: df=2, F=58.81, P≤.0001). However, the Cu levels observed in zooplankton did not vary significantly with season (df=2, F=1.79, P≤.1919). The maximal levels of Cd in zooplankton in November may be due to increased ingestion of material that is resuspended during turnover. Similarly, the peak levels of Cu and Cd recorded in November in phytoplankton may be due to a combination of processes: a) change in the size structure of the phytoplankton community to smaller individuals with higher metal sorption capacities and/or b) contamination of phytoplanktonic tissue samples by resuspended material. Phytoplankton metal levels (Cu and Cd) are negatively correlated with chl a concentrations (n=45, r=.8171, ≤.0001 and n-41, r=-.5961, P≤. 0001, respectively). These relationships are likely the result of a dilution effect. Zooplankton Cd levels were positively correlated with water and phytoplankton Cd concentrations (n=41, r=.3211, P≤.0407 and r=.7667, P≤.0001) while Cu levels were not correlated with any of the variables tested. The difference between the correlatedness of Cd levels in zooplankton to water and phytoplankton Cd levels compared to the lack of this type of relationship with regard to Cu may be attributable to the biological function of each metal in zooplankton. Cu is required in small amounts for physiological processes and may be regulated whereas Cd has no known biological function. / Thesis / Master of Science (MS)
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Studies in the Arctic plankton, comprising a faunistic survey of certain of the marine planktonic groups collected in the Canadian eastern arctic, and an investigation of the breeding cycles of five of the most important species in the eastern arctic and in west Greenland. --.Dunbar, M. J. (Maxwell John). January 1941 (has links)
No description available.
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Plankton and nutrient ecology of the Columbia River estuaryHaertel, Lois Steben 24 July 1969 (has links)
Monthly samples of nutrients, phytoplankton and zooplankton
were taken in the Columbia River estuary over a period of 16 months
in order to determine distribution with season and salinity, and interrelationships
between plankton and nutrients.
Nitrate and phosphate levels in the river water entering the
estuary are high in the winter and show depletion during the summer.
Silicate levels are high in the river water at all seasons. Nitrate
and phosphate levels are high in the entering ocean water during summer
offshore upwelling. The nutrient levels in the estuary generally
show a linear relationship with salinity, resulting from the levels of
nutrients in the entering river and ocean water. Superimposed upon
this linear relationship is a tendency for the nutrients to be enriched
in the bottom waters of the central part of the estuary.
The estuary phytoplankton are primarily composed of freshwater
forms, and probably represent a downstream extension of the
river flora. Regression analysis of phytoplankton levels vs. light,
nutrients, and river flow indicates that light probably limits phytoplankton
abundance on most dates.
The zooplankton of the estuary are composed of three groups,
preferring fresh, oligohaline, and polyhaline waters respectively.
Regression analysis indicates a strong correlation between abundance
of the freshwater group and river temperature. The factors controlling
the abundance of the oligohaline and polyhaline groups are less
obvious. The oligohaline group, principally Eurytemora affinis,
reaches the greatest population density (100,000/m³ or more).
Regression analysis indicates a close correlation between
Eurytemora abundance and phosphate levels. This indicates a strong
potential for zooplankton regeneration of phosphate necessary for
phytoplankton growth. / Graduation date: 1970
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Antibacterial activity of some marine planktonic algae in Hong Kong /Lo, Shiu-hong. January 1996 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 84-93).
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Effects of salinity on coastal lagoon plankton assemblagesGreenwald, Glenn M. January 1989 (has links)
Thesis (M.S.)--San Diego State University, 1989. / Includes bibliographical references (leaves 90-103).
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Selected interactions between phytoplankton, zooplankton, and the microbial food web microcosm experiments in marine and limnic habitats /Katechakis, Alexis, January 2006 (has links)
Thesis (doctoral)--Ludwig-Maximilians-Universität München, 2006. / Title from PDF t.p. (viewed on May 14, 2006). Includes reprints of papers co-authored with others. Vita. Includes bibliographical references.
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Ocean acidification : impacts on copepod growth and reproductionCripps, Gemma Louise January 2014 (has links)
No description available.
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The impact of mesoscale jet activity on plankton heterogeneity and primary production : a numerical modelling studySpall, Steven Andrew January 1997 (has links)
No description available.
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Seasonal microbial dynamics in two ultra-oligotrophic Antarctic freshwater lakesHenshaw, Tracey January 2001 (has links)
No description available.
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Laboratory and field investigations into the feeding performance of the Lake Malawi oreochromisHartnell, Robert Massey January 1996 (has links)
No description available.
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