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Title: The ecology of phytoplankton in Oxwich Bay, Bristol Channel, with special reference to nutrient physiology
Author: Vogelmann, J. B.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1980
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The ecology of the phytoplankton in Oxwich Bay was investigated during 1978-1979. Two sampling stations were employed, and at each, monthly measurements were made of the following parameters: water temperature, salinity, dissolved inorganic phosphate, silicate, nitrate and chlorophyll a. At each station, phytoplankton samples were collected, and observed microscopically for species composition. Correlations were made between these parameters and the phytoplankton species present. These were then evaluated in the light of other ecological studies carried out in the Bristol Channel, in order to identify the particular parameter or parameters which may have been responsible for controlling phytoplankton species succession. Concurrently, culture experiments were carried out with Navicula sp., Nitzschia sp., Thalassiosira sp., Skeletonema costatum, and Cylindrotheca closterium grown separately and in mixed cultures with the following nutrient enrichments: 1) high phosphate 2) low phosphate 3) high nitrate (a) 4) low nitrate 5) high nitrate (b) 6) high ammonium. The cultures were grown in chemostats and the competitive outcome with each of the enrichments was observed, in order to determine whether changes in the form or level of the nutrients were capable of influencing the dominance pattern. The results of these culture experiments were discussed in relation to the ecological observations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available