Îchesis Submitted for the Degree of Doctor of Philosophy. 1974. Seston Distribution and Phytoplankton Production in Axifew
îChesis Submitted for the Degree of Doctor of Philosophy. 1974 . Seston Distribution and Phytoplankton Production in ax Ifew, Eutrophia Reservoir subject to Artificial Mixing. by Gordon Douglas Haffner, B.Sc, -GND-N. UPJiV / ProQuest Number: 10107304 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest 10107304 Published by ProQuest LLC(2016). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 - 2 - - ABSTRACT - Phytoplankton ecology of a new, artificially mixed Thames Valley Reservoir at Wraysbury, Buckinghamshire, was investigated during the period from late 1971 to early spring 1974. Biological, chemical, and physical aspects and their inter-relationships are discussed in reference to artificial mixing. Nitrates and phosphates were never limiting, and showed little fluctuation with phytoplankton growths. Although silicate concentrations decreased during vernal and autumnal diatom pulses of Stephanodiscus astraea (Ehrenb.) Grim. Stephanodiscus rotula (Kutz.) Hendey, dissolved silica seemed to be of secondary importance in limiting rates of growth or maximum yields. Particular emphasis was placed on the interactions of the seston, in particular the ratio of productive to non-productive particles as determined by particle frequency-size analyses using Coulter Counter Models A and B with 100 and 200 p.m.
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