Effects of nutrient recycling by zooplankton and fish on phytoplankton communities |
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Authors: | José Luiz Attayde Lars-Anders Hansson |
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Institution: | (1) Institute of Ecology/Limnology, Ecology Building, S-22362 Lund, Sweden e-mail: Jose_Luiz.Attayde@limnol.lu.se, Fax: +46-46-2224003, SE |
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Abstract: | In laboratory experiments we tested the hypothesis that nutrients supplied by fish and zooplankton affect the structure and
dynamics of phytoplankton communities. As expected from their body size differences, fish released nutrients at lower mass-specific
rates than Daphnia. On average, these consumers released nutrients at similar N:P ratios, although the ratios released by Daphnia were more variable than those released by fish. Nutrient supply by both fish and Daphnia reduced species richness and diversity of phytoplankton communities and increased algal biomass and dominance. However, nutrient
recycling by fish supported a more diverse phytoplankton community than nutrient recycling by Daphnia. We conclude that nutrient recycling by zooplankton and fish have different effects on phytoplankton community structure
due to differences in the quality of nutrients released.
Received: 21 December 1998 / Accepted: 31 May 1999 |
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Keywords: | Nutrient excretion Food chain Algal diversity |
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