Phytoplankton dynamics,primary productivity and community metabolism in a north-central Texas pond |
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Authors: | M. H. Kelly L. C. Fitzpatrick W. D. Pearson |
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Affiliation: | (1) Cooperative Wildlife Research Laboratory, Southern Illinois University, 62901 Carbondale, Ill;(2) Dept. Biological Sciences and Institute of Applied Sciences, North Texas State University, 76203 Denton, Tx.;(3) Water Resources Laboratory, University of Louisville, 40208 Louisville, Ky. |
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Abstract: | Phytoplankton diversity, primary productivity and community metabolism were measured for 1 year in a 0.94 ha pond located in north-central Texas. Gross primary production ranged from 4.5 to 46.8 kcal m−2 day−1 ( =22.0 kcal m−2 day−1) and community metabolism ranged from 7.3 to 32.4 kcal m−2 day−1 ( =14.8 kcal m−2 day−1). Average production/respiration ratio (1.5) showed that the pond was principally autotrophic. Photosynthetic efficiency (gross primary production/0.5 total solar radiation) ranged from 0.32 to 2.8 with a mean of 1.2. Phytoplankton diversity based on numbers and biomass fluctuated greatly. Highest gross primary productivity occurred during Cyanophyta blooms in late summer-early fall when species diversity was minimal. Water temperature and turbidity, which governed light penetration, were the principal determinants of primary production. |
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Keywords: | primary productivity community metabolism phytoplankton dynamics physico-chemistry diversity |
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