Rehevyminen

Rehevyminen is a Finnish term that describes the process of eutrophication, particularly in aquatic ecosystems. It refers to the enrichment of water bodies with nutrients, primarily nitrogen and phosphorus, which leads to an excessive growth of algae and other aquatic plants. This overgrowth, often referred to as an algal bloom, can have detrimental effects on the water body and its inhabitants.

The increased nutrient load in Rehevyminen typically originates from anthropogenic sources such as agricultural runoff containing fertilizers, untreated sewage discharge, and industrial wastewater. Natural sources can also contribute, but human activities are usually the dominant factor in accelerated eutrophication.

As algae and plants proliferate, they consume dissolved oxygen in the water during their decomposition. This depletion of oxygen, known as hypoxia or anoxia, can lead to the death of fish and other aquatic organisms that require oxygen to survive. Additionally, dense algal blooms can block sunlight from reaching submerged vegetation, hindering their growth and impacting the food web. Some types of algae can also produce toxins that are harmful to wildlife and humans.

The visual appearance of Rehevyminen often includes a thick, green, or sometimes brown, layer on the water's surface. The water may also become cloudy and develop unpleasant odors. Managing Rehevyminen involves reducing nutrient inputs through improved wastewater treatment, sustainable agricultural practices, and land-use planning to minimize runoff.