Abstract
Top-down control of phytoplankton by zooplankton is possible through reductions in density of zooplanktivorous fish. Little Mere is a shallow lake where the effects of sewage effluent caused such a reduction. This allowed the large-bodied cladoceran, Daphnia magna Straus, to develop huge populations, preventing potentially large algal crops from developing.
Subsequent diversion of the effluent is anticipated to lead to recovery of the fish community, reduced numbers of large-bodied grazers, and increased phytoplankton biomass. Whether the aquatic plant community, present in Little Mere, is resilient to such changes may depend upon whether cyanophytes are favoured, or not.
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Carvalho, L. Top-down control of phytoplankton in a shallow hypertrophic lake: Little Mere (England). Hydrobiologia 275, 53–63 (1994). https://doi.org/10.1007/BF00026699
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DOI: https://doi.org/10.1007/BF00026699