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Title: Ecological studies on the phytoplankton of the freshwater marsh, Oxwich, South Wales
Author: Al-Homaidan, A. A.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1987
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The ecology of the phytoplankton in Oxwich Freshwater Marsh was investigated during the period from January 1984 to April 1986. Sampling was carried out in five different locations and at each, monthly measurements were made of the following parameters: water and air temperature, dissolved oxygen, pH, alkalinity, ammonia, nitrite, nitrate, phosphate, silicate and chlorophyll a. Phytoplankton species composition was studied by examining water samples microscopically. Correlations were made between these parameters and the dominant species of the phytoplankton. Primary productivity of the phytoplankton was measured using the 14C fixation technique. A positive correlation was found between the phytoplankton total number of units and chlorophyll a and between chlorophyll a and primary production. Fractionation of the phytoplankton into a series of algal size classes revealed that more than 85% of total 14C fixation was carried out by organisms μm. Algal bioassay experiments were carried out on filtered waters from the five study areas using the green alga Selenastrum capricornutum Printz as a test species. The addition of phosphorus, nitrogen and EDTA, singly and in combination, to the various waters failed to affect significantly the growth of the test species in about 70% of the enrichment experiments. Inhibition to algal growth after the additions of the different nutrients was noted in about 15% of the enrichment experiments. The factors which caused the lack of significant algal growth and those which caused the inhibition are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available