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The environment database and a glossary about facts, terms and descriptions

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Glossary O

The Environmental Glossary. Letter O +++ Popular Articles: 'Oxygen', 'Overharvesting', 'Oceanography'

Overexploitation

Deutsch: Übernutzung / Español: Sobreexplotación / Português: Sobre-exploração / Français: Surexploitation / Italiano: Sovrasfruttamento

Overexploitation refers to the excessive use of natural resources at a rate that exceeds their natural replenishment, leading to the depletion or degradation of ecosystems. This environmental problem affects biodiversity, forests, fisheries, water resources, and other key components of the planet’s natural systems. Overexploitation often results from human activities such as unsustainable Logging, overfishing, and excessive water use, which can disrupt ecosystems and threaten the survival of species.

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Overfishing

Deutsch: Überfischung / Español: Sobrepesca / Português: Sobrepesca / Français: Surpêche / Italiano: Sovrappesca

Overfishing refers to the practice of catching fish from a body of water at a rate that is faster than the fish population can naturally replenish. In the environmental context, overfishing has severe consequences for marine ecosystems, biodiversity, and the sustainability of fish stocks, often leading to the depletion of species and disruption of marine food chains.

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Overgrazing

Deutsch: Überweidung / Español: Sobrepastoreo / Português: Sobrepastoreio / Français: Surpâturage / Italiano: Sovrapascolo

Overgrazing occurs when animals graze a particular area excessively, stripping the land of vegetation faster than it can naturally regenerate. This process leads to soil degradation, loss of biodiversity, and other environmental issues, as the ecosystem struggles to recover from the overuse. It is a common problem in agricultural and pastoral regions where land management is not sustainable.

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Overharvesting

Deutsch: Übernutzung / Español: Sobreexplotación / Português: Sobre-exploração / Français: Surexploitation / Italiano: Sovrasfruttamento

Overharvesting refers to the unsustainable extraction of natural resources at a rate that exceeds their capacity for regeneration. This phenomenon poses a critical threat to biodiversity, ecosystem stability, and long-term human well-being, particularly in sectors such as fisheries, forestry, and wildlife trade. The consequences of overharvesting extend beyond ecological degradation, often disrupting socioeconomic systems dependent on these resources.

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Oversight

The Oversight is the independent assessment of the quality system and/or projects for conformance with requirements, effectiveness of requirements in maintaining quality, and ensuring or effecting appropriate corrective action.

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Oxidant

German: Oxyidationsmittel
An Oxidant is a Chemical Compound that has the ability to remove, accept, or share Electrons from another chemical species, thereby oxidizing it.

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Oxidation

Deutsch: Oxidation / Español: Oxidación / Português: Oxidação / Français: Oxydation / Italiano: Ossidazione /

Oxidation refers to a chemical reaction that involves the loss of electrons or an increase in oxidation state. It plays a crucial role in various environmental processes and can have both beneficial and detrimental effects.

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Oxidative Phosphorylation

Deutsch: Oxidative Phosphorylierung / Español: Fosforilación oxidativa / Português: Fosforilação oxidativa / Français: Phosphorylation oxydative / Italiano: Fosforilazione ossidativa

Oxidative phosphorylation is a fundamental biochemical process occurring in the mitochondria of eukaryotic cells and in the plasma membrane of prokaryotes, where it plays a central role in cellular respiration. This highly efficient mechanism couples the oxidation of reduced electron carriers, such as NADH and FADH₂, with the synthesis of adenosine triphosphate (ATP), the primary energy currency of cells. As a cornerstone of aerobic metabolism, oxidative phosphorylation not only sustains cellular energy demands but also influences broader environmental processes, including nutrient cycling and microbial activity in ecosystems.

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Oxidize

An Oxidize is To chemically transform a substance by combining it with oxygen. See chemical reaction.

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Oxycline depth

An oxycline depth is depth at which dissolved Oxygen levels fall below a threshold value.

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