Anóxicos

Anóxicos refers to conditions or environments characterized by a severe lack of oxygen. The term originates from the Greek prefix "an-" meaning "without" and "oxýs" meaning "sharp" or "acid," though in this context, it relates to oxygen. Anoxic conditions are primarily found in aquatic environments, such as the deep ocean, stratified lakes, and stagnant bodies of water. These areas can become anoxic when organic matter decomposes at a high rate, consuming dissolved oxygen faster than it can be replenished. This decomposition is often fueled by nutrient pollution, leading to eutrophication.

In terrestrial environments, anoxic conditions can occur in waterlogged soils or in sealed containers where respiration depletes oxygen. The absence of oxygen has profound implications for life. Most aerobic organisms, which require oxygen for respiration and survival, cannot exist in anoxic zones. Instead, these environments are typically inhabited by anaerobic microorganisms, such as certain bacteria and archaea, which have evolved metabolic pathways to survive and thrive without oxygen, often utilizing alternative electron acceptors like sulfate or nitrate. The study of anoxic environments is crucial for understanding biogeochemical cycles, particularly those involving carbon, nitrogen, and sulfur, and for assessing the health of aquatic ecosystems.