Impact of a small cormorant (Phalacrocorax carbo sinensis) roost on nutrients and phytoplankton assemblages in the littoral regions of a submontane reservoir |
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Authors: | Robert Gwiazda Karolina Jarocha and Ewa Szarek-Gwiazda |
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Institution: | (1) Department of Environmental Science and Biology, State University of New York College, Brockport, NY 14420, USA;(2) Present address: Department of Biology, University of Rochester, Rochester, New York 14627-0211, USA |
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Abstract: | Cormorants (median numbers of 54.5 ind.) excreted ca. 102.7 kg yr−1 of nitrogen and ca. 80.5 kg yr−1 of phosphorus in the area of the Dobczyce Reservoir (ca. 980 ha). Concentrations of N-tot and P-tot were 3 times higher in
soil from the roosting area of the cormorants than outside this area. Nutrient concentrations in the littoral sediment of
the reservoir were also higher in the area frequented by these birds. Differences in concentrations of pH, NO3−, NO2−, NH4+, PO4−, and P-tot in water between the area associated with the cormorants and the reference site were not found. Differences in
the planktonic algal communities from around the roost and the reference site were not found, with the exception of the chlorophytes
which were more abundant in the area occupied by the cormorants. Water movement and mixing in the reservoir can influence
the effect of the nutrient load on the water chemistry and planktonic algae. |
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