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IB2.31.3 Causes of extinction Causes of extinction © Oxford University Press 2011 IB2.31.3 Causes of extinction New predators New competitors Changes to environment Causes of extinction There are many possible causes of extinction. Several factors may combine to bring about an extinction. Often, extinction will result if a species is unable to adapt or is outcompeted by a rival. New diseases Click on an image to find out more. Major catastrophic events Changes Major New competitors predators diseases catastrophic to the(e.g. environment events humans) (e.g. over volcanic time (e.g. eruptions) Manyred The Hunting Some temperature believe diseases squirrel by humans increases) that can is dinosaurs now has wipe inbeen out serious became an responsible entire decline extinct species in forthe following the before UK an it asteroid following extinction has The time woolly impact to the ofmammoth develop many introduction which animals. immunity. became resulted of The theThe extinct ingrey dodo, reduced elm squirrel, about which treesunlight population 10,000 lived a new onand the is which,effective more island almost years ago, of in extinct Mauritius, turn, partly due meant competitor because to became a that fungal plants than the extinct disease climate the could resident in the became called notseventeenth species. Dutch warmer. elm photosynthesise century, disease. not long so after effectively. humans first landed there. © Oxford University Press 2011