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Background extinction rate, also known as the normal extinction rate, refers to the standard rate of extinction in Earth's geological and biological history, excluding major extinction events, including the current human-induced Holocene extinction. There have been five mass extinction events throughout Earth's history.
11 gru 2018 · Background extinction rate, or normal extinction rate, refers to the number of species that would be expected to go extinct over a period of time, based on non-anthropogenic (non-human) factors. The background extinction rate is often measured for a specific classification and over a particular period of time.
3 paź 2024 · To make comparisons of present-day extinction rates conservative, assume that the normal rate is just one extinction per million species per year. This then is the benchmark—the background rate against which one can compare modern rates.
The background extinction rate represents the natural, ongoing process of species loss that occurs over geological time scales. It is influenced by factors such as natural selection, environmental changes, competition, and predation.
The background extinction rate refers to the average rate at which species go extinct over a long period of geological time, without considering the impacts of mass extinction events. This rate is generally calculated based on the fossil record and reflects the normal turnover of species in ecosystems, illustrating how extinction is a natural ...
11 sty 2012 · Background extinction consists typically of two intergrading phases: habitat attenuation and habitat dissolution. These processes generate the relict populations that characterize many species undergoing background extinction.
Rates of extinction have varied among species and through time, but most extinctions are considered “background extinctions”, occurring at rates that did not disrupt entire ecosystems. The phrase “mass extinction” is used to describe one of five major events in Earth history during which many different kinds of species vanished ...
