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The presence in or introduction into the environment of a substance which has harmful or poisonous effects.

A more common term for Hypoxia, which refers to a reduced level of oxygen in the water.

Excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant life.

A rapid increase or accumulation in the population of algae in freshwater or marine water systems (potentially due to Eutrophication), and is recognised by the discolouration in the water from their pigments.

A chemical or natural substance added to soil or land to increase its fertility.

A substance that provides nourishment essential for the maintenance of life and for growth.

The draining away of water (or substances carried in it) from the surface of an Area of land, a building or structure, etc.

Members of a large group of unicellular microorganisms which have cell walls but lack organelles and an organised nucleus, including some which can cause disease.

The state or process of rotting; decay.

Deficiency in the amount of oxygen reaching the tissues. Aqua Hypoxia is oxygen deficiency in a biotic environment.