Sediment cores comprised of sediments deposited during the last 40–100 years were retrieved from two reservoirs in the recently populated Dry Zone of Sri Lanka. Both cores are initially dominated by littoral cladoceran taxa and undergo a pronounced change to the pelagic Bosminopsis
dietersi, in the mid 1950s in Nuwarawewa reservoir, and in the early 1980s in Kalawewa reservoir. The correlations between human population and the accumulation rates of cladoceran remains in the sediments are strong and significant. An increase in Cladocera production is consistent with
agricultural development and human settlement. Government documents reveal that after the 1950s, the human population around Nuwarawewa increased exponentially, forest cover decreased exponentially and crop production increased as a result of a large-scale human resettlement program. This
resettlement was facilitated by canal renovations that resulted in enhanced water flow to the reservoirs. Similar changes occurred around Kalawewa, but increases in the human population did not occur until 1965, and large changes in forest cover and agricultural production did not occur until
1975. Observed increases in pelagic Cladocera in both reservoirs suggest increases in both water level and nutrients which are consistent with the timing of watershed modifications that would promote higher water levels and nutrients.
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Document Type: Research Article
Publication date: March 1, 2017
This article was made available online on February 13, 2017 as a Fast Track article with title: "Detecting recent limnological changes in two ancient reservoirs from Sri Lanka’s Dry Zone using Cladocera".
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Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.
Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.
Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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