The Seasonal Dynamics and Composition of Photosynthetic Picoplankton Communities in Temperate Lakes in Ontario, Canada
✍ Scribed by Frances R. Pick; Michael Agbeti
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 909 KB
- Volume
- 76
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
The seasonal abundance and composition of photosynthetic picoplankton (0.2-2 pm) was compared among five oligotrophic to mesotrophic lakes in Ontario. Epilimnetic picocyanobacteria abundance followed a similar pattern in all lakes; maximum abundance (2-4 x lo5 cells . ml-1) occurred in late summer following a period of rapid, often exponential increase after epilimnetic temperatures reached 20 "C. In half of the lakes picocyanobacteria abundance was significantly correlated with temperature, while in other lakes the presence of a small spring peak resulted in a poor correlation with temperature. In all lakes there was a significant correlation between epilimnetic abundance and day of the year. Correlations with water chemistry parameters (soluble reactive phosphorus, total phosphorus, particulate C : P and C : N) were generally weaker or insignificant.