File:Five past mass extinction events—periods.jpg
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| Description | Original description, according to the source, p. 258: "Figure 8.1 There have been five past mass extinction events—periods when natural events changed Earth’s environment so dramatically that between 60–95% of species were wiped away forever—over Earth’s geological history. So far, the most dramatic extinction event occurred at the end of the Permian period, about 250 million years ago, and thought to be the result of widespread volcanic activity and climate change. The most recent mass extinction, at the end of the Cretaceous period about 65 million years ago and thought to be the result of a massive asteroid impact, saw the disappearance of non-avian dinosaurs. Source: OpenStax, 2019, CC BY 4.0. There have been five past mass extinction events—periods when natural events changed Earth’s environment so dramatically that between 60–95% of species were wiped away forever—over Earth’s geological history. So far, the most dramatic extinction event occurred at the end of the Permian period, about 250 million years ago, and thought to be the result of widespread volcanic activity and climate change. The most recent mass extinction, at the end of the Cretaceous period about 65 million years ago and thought to be the result of a massive asteroid impact, saw the disappearance of non-avian dinosaurs. Source: OpenStax, 2019, CC BY 4.0.". Context in the source, page 258: "While many extinction events have been rather limited in scope and, hence, caused only one or a few extinctions at a time, there have been instances where perturbations were so impactful that they drove very large numbers of species to extinction over a short period of time. There have been five such past mass extinction events—periods marked by the sudden and dramatic loss of a large percentage of species (Figure 8.1). But these mass extinctions have also been followed by periods that favoured increased rates of speciation, during which new species evolved to fill the niches left empty by the extinctions.". |
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| Source | John W. Wilson, Richard B. Primack: "Conservation Biology in Sub-Saharan Africa", Chapter 8: "Extinction Is Forever", Open Book Publishers, Cambridge, UK, 2019, ISBN: 978-1-78374-751-1, pp. 257–296, here p. 258, Figure 8.1, DOI: https://doi.org/10.11647/OBP.0177, License: Creative Commons Attribution 4.0 International license (CC BY 4.0). Original URL of the image: https://books.openbookpublishers.com/10.11647/obp.0177/image/Fig_8.1.jpg |
| Author | Source: OpenStax, 2019 |
| Permission (Reusing this file) |
  This file is licensed under the Creative Commons Attribution 4.0 International license.
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| current | 20:03, 16 December 2023 | | 800 × 492 (64 KB) | Anglo-Araneophilus (talk | contribs) | {{Information |Description=Original description, according to the source, p. 258: "Figure 8.1 There have been five past mass extinction events—periods when natural events changed Earth’s environment so dramatically that between 60–95% of species were wiped away forever—over Earth’s geological history. So far, the most dramatic extinction event occurred at the end of the Permian period, about 250 million years ago, and thought to be the result of widespread volcanic activity and climate change... |
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