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Hydrobiologia

, Volume 58, Issue 3, pp 245–260 | Cite as

Phytoplankton dynamics, primary productivity and community metabolism in a north-central Texas pond

  • M. H. Kelly
  • L. C. Fitzpatrick
  • W. D. Pearson
Article

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 (\(\bar X\)=22.0 kcal m−2 day−1) and community metabolism ranged from 7.3 to 32.4 kcal m−2 day−1 (\(\bar X\)=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.

Keywords

primary productivity community metabolism phytoplankton dynamics physico-chemistry diversity 

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Copyright information

© Dr. W. Junk b. v. publishers 1978

Authors and Affiliations

  • M. H. Kelly
    • 1
  • L. C. Fitzpatrick
    • 2
  • W. D. Pearson
    • 3
  1. 1.Cooperative Wildlife Research LaboratorySouthern Illinois UniversityCarbondale
  2. 2.Dept. Biological Sciences and Institute of Applied SciencesNorth Texas State UniversityDenton
  3. 3.Water Resources LaboratoryUniversity of LouisvilleLouisville

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