water eutrophication and its effects

eutrophication algae blooms fich environment water river sea lake ecosystem plant carbon dioxide seawater process crustaceans minerals nitrogen phosphorus phytoplankton freshwater saltwater system ecology slow organic lichen fungi cultural pollution industrial aquatic millenium decades farming time particles concentration organisms light sun bird molecule education sience smoke cloud agriculture parts body progressively saturated nutrients phosphorus defined nutrient-induced increase productivity affect systems ecosystems always caused excess