Ammonium and phosphate regenerationby the zooplankton of an Amazon floodplain lake |
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Authors: | PETRA H LENZ JOHN M MELACK BARBARA ROBERTSON ELSA A HARDY |
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Institution: | Department of Biological Sciences and Marine Science Institute, University of California, Santa Barbara, California, U.S.A.;Instituto National de Pesquisas da Amazonia, Manaus, Amazonas, Brazil |
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Abstract: | SUMMARY. 1. Regeneration of ammonium and phosphate by macro-zooplankton (Cladocera. adult copepods. and copepodites) was measured in Lake Calado. an Amazon floodplain lake, Macrozooplanktonabundances ranged between 1×104 and 3×105 individuals m−2. 2. Phosphate regeneration ranged from 0.2 to 1.3 μ mol PO4 m−2 b−1at station 1. located 2 km from the Solimoes River, and from 1.6 to8.3 μ mol PO4 m−2 h −1 at station 3, located 7 km from the SolimoesRiver. Ammonium regeneration at stations 1 and 3 ranged from 1.7 to11.9 and from 13.4 to 77.2 μ mol NH4 m−2 h−1. respectively. 3. Zooplankton regenerated ammonium and phosphate at similarrates during rising and falling waier. Regeneration by macrozooplankton was low compared to other tropical lakes and compared to microbesand microzooplankton in Lake Calado. |
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