The natural aging process of lakes and reservoirs is known as?

The natural aging process of lakes and reservoirs is referred to as eutrophication. This process involves the gradual accumulation of nutrients, particularly nitrogen and phosphorus, in the water body, which leads to an increase in plant life, especially algae. Over time, this excess nutrient input can result in algal blooms that can deplete oxygen levels in the water when the algae die and decompose, ultimately affecting aquatic life.

Eutrophication can occur naturally over long periods, contributing to the aging process of lakes and reservoirs, as sediment and nutrients build up. This phenomenon is significant in understanding water quality and the ecological health of aquatic systems.

The other terms relate to different trophic statuses or processes but do not describe the natural aging process in the same way. Oligotrophication refers to a process where a water body becomes less productive over time, typically becoming clearer and having less nutrient content. Mesotrophication represents a middle level of nutrient enrichment and productivity. Autotrophication is not a commonly recognized term in limnology and does not pertain to the aging of water bodies.