Quantitative aspects of the ecology of marine planktonic ciliated protozoans, with special reference to Uronema marinum Dujardin
Quantitative aspects of the ecology of marine planktonic ciliated protozoans, with special reference to Uronema marinum Dujardin
The seasonal abundance of ciliates and other microseston components a I t Calshot was investigated between January 1974 and March 1975. Samples were collected by pumping and were size fractionated. Ciliates were found to be present throughout the year. The standing crops of both tintinnids and naked ciliates were at a maximum in late spring; a second peak was found in the autumn for tintinnids. Thirteen species of tintinnid were found although two species, StenosWella ventricosa and Tintinnopsis beroidea, dominated the tintinnid,assemblage throughout the year. Some tintinnid species showed seasonal succession and could be divided into seasonal groups.Laboratory studies were carried out A The bacteriovorous ciliateUronema marinum. The effects of salinity, food type and temperature-on reproduction were investigated. Experiments were carried out to determine rates of consumption, growth and reproduction in relation to food concentration and temperature. I Mean cell volumes and gross growth efficiencies were also measured. Spectrophotometry, using calibration by bacterial organic carbon measurements,' was used to determine food concentration. A method was developed for separating ciliates from their food for biomass estimation using the ciliate's migratory behaviourv Models were derived for consumption, growth and reproduction based on the forcing functions of food concentration and temperature. Tentative estimates were made for the- production of naked ciliate; and 'their consumption of bacteria at Calshot by integrating the field work data with the models of consumption and growth. Estimates were also made for the production of tintinnids and their consumption of nanophytoplankton using field study data and-literature derived information on consumption and reproduction. The results obtained suggest that the grazing of bacteria by naked ciliates is negligible in proportion to bacterial standing crop and production but that tintinnids may be important' in controlling phytoplankton production.
University of Southampton
Burkill, Peter H
511b68df-1664-418f-baa1-b1075f1e1fed
1978
Burkill, Peter H
511b68df-1664-418f-baa1-b1075f1e1fed
Burkill, Peter H
(1978)
Quantitative aspects of the ecology of marine planktonic ciliated protozoans, with special reference to Uronema marinum Dujardin.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The seasonal abundance of ciliates and other microseston components a I t Calshot was investigated between January 1974 and March 1975. Samples were collected by pumping and were size fractionated. Ciliates were found to be present throughout the year. The standing crops of both tintinnids and naked ciliates were at a maximum in late spring; a second peak was found in the autumn for tintinnids. Thirteen species of tintinnid were found although two species, StenosWella ventricosa and Tintinnopsis beroidea, dominated the tintinnid,assemblage throughout the year. Some tintinnid species showed seasonal succession and could be divided into seasonal groups.Laboratory studies were carried out A The bacteriovorous ciliateUronema marinum. The effects of salinity, food type and temperature-on reproduction were investigated. Experiments were carried out to determine rates of consumption, growth and reproduction in relation to food concentration and temperature. I Mean cell volumes and gross growth efficiencies were also measured. Spectrophotometry, using calibration by bacterial organic carbon measurements,' was used to determine food concentration. A method was developed for separating ciliates from their food for biomass estimation using the ciliate's migratory behaviourv Models were derived for consumption, growth and reproduction based on the forcing functions of food concentration and temperature. Tentative estimates were made for the- production of naked ciliate; and 'their consumption of bacteria at Calshot by integrating the field work data with the models of consumption and growth. Estimates were also made for the production of tintinnids and their consumption of nanophytoplankton using field study data and-literature derived information on consumption and reproduction. The results obtained suggest that the grazing of bacteria by naked ciliates is negligible in proportion to bacterial standing crop and production but that tintinnids may be important' in controlling phytoplankton production.
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Published date: 1978
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Local EPrints ID: 459746
URI: http://eprints.soton.ac.uk/id/eprint/459746
PURE UUID: bb273f4a-ab06-4b47-85c3-bd63345fb8cc
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Date deposited: 04 Jul 2022 17:17
Last modified: 23 Jul 2022 00:31
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Author:
Peter H Burkill
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