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Binelli, A., A. Provini, and S. Galassi, 1997. Trophic Modifications in Lake Como
(N. Italy) Caused by the Zebra Mussel (Dreissena polymorpha), University of
Milan
Reprinted from Water, Air and Soil Pollution (1997) 99: 633-640
Trophic Modifications in Lake Como (N. Italy) Caused by the
Zebra Mussel (Dreissena polymorpha)
Abstract
A large scale study on the western basin of Lake Como (N. Italy) was started in 1995
to examine the effects of the zebra mussel colonization which began in early `90. Our
results have been related to `91-92 data (pre-Dreissena period), before the
maximum colonization of zebra mussel. In spring and summer of the post Dreissena
period total phosphorus, P-PO4,, nitrate and chlorophyll values decreased,
while ammonium and transparency increased at every sampling station.
Zebra mussel does not modify the trophic state of this sub-basin but it plays an important
role in nutrient cycling. The entire population can filter epilimnetic waters 2.1 times
per year and can produce 2.9 x 104 t/y of pseudofaeces which are transferred to
sediments.
Contact: A. Binelli, Department of Biology, University of
Milan, Via Celoria 26, 20133 Milan, Italy
Keywords: Zebra_mussel, Colonization, Filters
Product Type: Research, Basic_biology
User Type: General
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