Algal Populations and Characteristics of Oxygen Exchange of Effluent Samples from a Facultative Oxidation Pond

Irving, Donald and Dromgoole, F. I. (1986) Algal Populations and Characteristics of Oxygen Exchange of Effluent Samples from a Facultative Oxidation Pond.

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Title Algal Populations and Characteristics of Oxygen Exchange of Effluent Samples from a Facultative Oxidation Pond
Abstract/Summary Algal populations in a facultative oxidation pond were monitored over a 12 month period. The relationships between cell counts of individual species and characteristics of oxygen exchange, determined from changes in dissolved oxygen concentration in response to varying light flux density, were investigated by correlation analysis. These measurements were made in the laboratory at a constant temperature (15 degrees C). Microalgae (Chlorella spp.) usually made up at least 80% of the total cell numbers, whereas Euglena acus, E. gracilis, and Ankistrodesmus falcatus var. acicularis separately made up less than 10% of the total counts. However, when cell volumes were considered, E. acus usually made the greatest contribution, and this species accounted for 86% (=r^2) of the variation in total cell volume. The detectable pigment concentration in the water was closely related to the numbers of E. acus present (r=0.81, P < 0.001) but not to the numbers of microalgae (r=0.00). Cell counts of E. acus were highly correlated with the light saturated rate of net oxygen production (P_n_max) and to the rate under limiting light supply (theta) because of the high detectable pigment contribution from this species. It was calculated that E. acus contributed, on average, about 44% of the total rate of net oxygen production, whereas the proportion attributed to the microalgae was 8%.
Keyword Ankistrodesmus falcatus var. acicularis
Chlorella spp.
Euglena acus
E. gracilis
sewage oxidation pond
oxygen exchange
pigment
microalgae
Date 1986-01-01
Subjects 270402 Plant Physiology
Author Irving, Donald
Dromgoole, F. I.
Additional Notes Later published in New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20: 9-16.

Document type: Preprint
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 11 Oct 2005, 10:00:00 EST by Belinda Weaver (EA)