Answer:
eutrophication
Step-by-step explanation:
Eutrophication (or eutrophication) is a process usually of anthropic origin (caused by man), or rarely of a natural nature, having as its basic principle the gradual concentration of accumulated organic matter in aquatic environments.
Among the impacting factors, contributing to the increasing pollution rate in this ecosystem, are: domestic waste (sewage), agricultural fertilizers and industrial effluents, directly discharged or percolated towards watercourses (rivers and lakes, for example).