Historical changes in the ecosystem condition of a small mountain lake over the past 60 years as revealed by plankton remains and Daphnia ephippial carapaces stored in lake sediments

PloS One
Hajime OhtsukiJotaro Urabe

Abstract

To examine if changes in species composition of a plankton community in the past due to anthropogenic activities can be clarified in lakes without any monitoring data, we analyzed genetically ephippial carapaces of Daphnia with plankton remains stored in the bottom sediments of Lake Hataya Ohunma in Japan. In the lake, abundance of most plankton remains in the sediments was limited and TP flux was at low levels (2-4 mg/m2/y) before 1970. However TP flux increased two-fold during the period from 1980s to 1990 s. In parallel with this increase, abundance of most plankton remains increased although abundance of benthic testate amoebae's remains decreased, indicating that the lake trophic condition had changed from oligo- to mesotrophic for the past 60 years. According to cluster analysis, the stratigraphic sediments were divided into two periods with different features of the phytoplankton composition. Chronological comparison with events in the watershed suggested that eutrophication occurred because of an increase in visitors to the watershed and deposition of atmospheric dust. In this lake more than 50% of resting eggs produced by Daphnia over the past 60 years hatched. However, genetic analysis of the ephippial carapaces (rema...Continue Reading

References

Sep 18, 2004·Oecologia·Carla E Cáceres, Alan J Tessier
Mar 11, 2009·Proceedings of the National Academy of Sciences of the United States of America·Nora BredeKlaus Schwenk
Oct 1, 1993·Trends in Ecology & Evolution·N John Anderson
Jan 10, 2014·Ecology Letters·Dagmar FrischPunidan D Jeyasingh

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Citations

Dec 18, 2019·Environmental Science and Pollution Research International·Kun ZhangLei Ji

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Methods Mentioned

BETA
gamma-ray
electrophoresis
PCR

Software Mentioned

R
BlastN

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