Nutrients carried into water bodies from non-point sources such as agricultural runoff , residential fertilisers , and sewage will all increase the algal biomass , and can easily cause an oligotrophic lake to become hypereutrophic .
Nutrients carried into water bodies , such as agricultural runoff , residential fertilisers , and sewage will all increase the algal biomass , and can easily cause an oligotrophic lake to become hypereutrophic .