Kuoliko kaikki elävä viimeisen jääkauden aikana?
The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinct event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction event, the Triassic–Jurassic extinction event, and the Cretaceous–Paleogene extinction event. Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time. There is no general agreement on where the Holocene, or anthropogenic, extinction begins, and the Quaternary extinction event, which includes climate change resulting in the end of the last ice age, ends, or if they should be considered separate events at all. Some have suggested that anthropogenic extinctions may have begun as early as when the first modern humans spread out of Africa between 200,000 and 100,000 years ago; this is supported by rapid megafaunal extinction following recent human colonisation in Australia, New Zealand and Madagascar, as might be expected when any large, adaptable predator (invasive species) moves into a new ecosystem. In many cases, it is suggested that even minimal hunting pressure was enough to wipe out large fauna, particularly on geographically isolated islands. Only during the most recent parts of the extinction have plants also suffered large losses.
no