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Predation and competition with introduced largemouth bass, water level fall after the 1976 Guatemala earthquake, and degradation of breeding sites due to reed-cutting and tourism development. [ 603 ] 1984. Green blossom. Epioblasma torulosa gubernaculum.
Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...
End-Jurassic (Tithonian) 145 Ma. No longer regarded as a major extinction but rather a series of lesser events due to bolide impacts, eruptions of flood basalts, climate change and disruptions to oceanic systems [16] Pliensbachian-Toarcian extinction (Toarcian turnover) 186-178 Ma.
576.8/4. LC Class. QE721.2.E97 K65 2014. The Sixth Extinction: An Unnatural History is a 2014 non-fiction book written by Elizabeth Kolbert and published by Henry Holt and Company. The book argues that the Earth is in the midst of a modern, man-made, sixth extinction. In the book, Kolbert chronicles previous mass extinction events, and compares ...
A study published in May 2017 in Proceedings of the National Academy of Sciences argued that a "biological annihilation" akin to a sixth mass extinction event is underway as a result of anthropogenic causes, such as over-population and over-consumption. The study suggested that as much as 50% of the number of animal individuals that once lived ...
Researchers have gone back in time to find an extinction event that predates all other known events of their kind. Scientists Discovered a Surprise 6th Mass Extinction, Which Came Before the Big 5 ...
Life timeline −4500 — – — ... 70% of all species became extinct in a sequence of mass extinction ... This is sometimes referred to as the "Sixth Extinction ...
The Holocene extinction, otherwise referred to as the sixth mass extinction or Anthropocene extinction, [104] [105] is an ongoing extinction event of species during the present Holocene epoch (with the more recent time sometimes called Anthropocene) as a result of human activity.