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The phytoplankton periodicities of two warm-climate lakes subject to marked seasonal variability

Published online by Cambridge University Press:  10 July 2009

M. A. Khan
M. A. Khan
Affiliation:
Ecology Research Laboratory, Department of Botany, University of Kashmir, Post Box 726, GPO, Srinagar-190001, India
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Abstract

The phytoplankton periodicity of a tropical upland reservoir in Nigeria (Liberty Dam, Jos Plateau) and a temperate-type lake (L. Naranbagh) from the Kashmir Himalaya were compared. Variations in the phytoplankton communities in the water-bodies were both quantitative and qualitative. Liberty Dam conformed to the oligotrophic-desmid plankton type whilst in L.Naranbagh, phytoplankton resembled the eutrophic chlorococcales-diatom plankton type. Contrary to the general belief of muted (or lack of) seasonal changes in tropical regions, phytoplankton succession in the Jos reservoir was pronounced with dense persistence of some species for relatively short periods. The most striking fluctuations, typical of many temperate waters, were characteristic of L. Naranbagh with a build-up of plankton during summer and autumn. Variability in photosynthetic productivity was related to shifts in the climate-dependent population densities. The seasonal growth of the Jos phytoplankton reflected the alteration from the dry ‘Harmattan’ (December–February) to wetter (May–September) periods. These are analogous to the winter (December–February) and summer (June–August) seasons of the Kashmir Himalayan Valley. Phytoplankton associations and periodicities in each of the two warm-belt lakes were strongly driven by their respective local environments, including especially the marked seasonality of the climatic variables (rain, wind and solar radiation). Detailed comparisons of adequate long-term data from tropical and temperate waters are still required.

Keywords

ecologyJos PlateauKashmir Himalayaperiodicityphytoplanktonwarm-belt lakes
Type
Research Article
Information
Journal of Tropical Ecology , Volume 12 , Issue 4 , July 1996 , pp. 461 - 474
Copyright
Copyright © Cambridge University Press 1996

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