In ocean and freshwater environments, the term hypoxia refers to low or depleted oxygen in a water body. Hypoxia is often associated with the overgrowth of certain species of algae, which can lead to oxygen depletion when they die, sink to the bottom, and decompose.

2025年2月4日 · Ocean hypoxia research is a field that has evolved conceptually to address the interplay between anthropogenic forcings at global climate and local ecosystem scales.

Hypoxia (hypo: "below", oxia: "oxygenated") refers to low oxygen conditions. Hypoxia is problematic for air-breathing organisms, yet it is essential for many anaerobic organisms. Hypoxia applies to many situations, but usually refers to the atmosphere and natural waters.

We show that the spatial extent of hypoxia is highly sensitive to small changes in the ocean’s O 2 content, with maximum responses at suboxic concentrations where anaerobic metabolisms predominate. In model-based reconstructions of historical oxygen changes, the world’s largest suboxic zone, in the Pacific Ocean, varies in size by a factor ...

This massive load of nutrients eventually end up in our coastal ocean, fueling a chain of events that can lead to hypoxic 'dead zones' -- areas along the sea floor where oxygen is so low it can no longer sustain marine life. In this episode, we explore why dead zones form, how the problem of hypoxia is growing worse, and what we're doing about it.

Hypoxia occurs when the amount of oxygen in water becomes too low to support most aquatic life (typically below 2 mg/L). Hypoxia is an expanding global problem and a symptom of degraded water quality, largely resulting from human activities such as agricultural runoff, burning of fossil fuels, and wastewater treatment discharges. Hypoxic waters can

2016年5月1日 · We review the evidence from published factorial experiments that used static and/or fluctuating pH and DO levels to examine different traits (e.g. survival, growth, metabolism), life stages and species across a broad taxonomic spectrum.

We review the evidence from published factorial experiments that used static and/or fluctuating pH and DO levels to examine different traits (e.g. survival, growth, metabolism), life stages and species across a broad taxonomic spectrum.

OCEAN HYPOXIA Definition: Reduced oxygen in the ocean, detrimental to living organisms. Causes: Excess anthropogenic nutrients, especially fertilisers such as nitrogen and phosphorus, fuels phytoplankton growth. As it dies, phytoplankton sinks to the bottom where it is decomposed by bacteria that use up oxygen.

2016年6月2日 · A new review of the effects of hypoxia and OA on marine animals shows that effects of these conditions are complex and unpredictable; vary among species and life stage; and depend upon whether hypoxia or low pH occur alone or in tandem. Results show that hypoxia and OA can affect organism survival and growth.