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Habitat size and numbers of species are systematically related. Physically larger species and those living at lower latitudes or in forests or oceans are more sensitive to reduction in habitat area. [23] Conversion to "trivial" standardized ecosystems (e.g., monoculture following deforestation) effectively destroys habitat for the more diverse ...
The main drivers of marine species extinction are habitat loss, pollution, invasive species, and overexploitation. [105] [106] Greater pressure is placed on marine ecosystems near coastal areas because of the human settlements in those areas. [107] Overexploitation has resulted in the extinction of over 25 marine species.
An example of how this may happen is through by-catch.These new species will outcompete the native species and take over, therefore causing the local or global extinction of a species. [32] Due to the fittest animals in the species being hunted or poached, the less fit organisms will mate, causing less fitness in the generations to come.
With regards to climate change, the experts estimated that 2 °C (3.6 °F) threatens or drives to extinction about 25% of the species, although their estimates ranged from 15% to 40%. When asked about 5 °C (9.0 °F) warming, they believed it would threaten or drive into extinction 50% of the species, with the range between 32 and 70%. [54]
The first recorded attempts to artificially induce animal tumors through the application of tobacco products occurred in 1911. [1] A 2004 series of monographs released by the International Agency for Research on Cancer, a part of the World Health Organisation, summarized research from the 1960s onwards about the carcinogenicity of tobacco on various laboratory animals.
The species include a fruit bat, two species of fish, eight types of mussels and 10 types of birds.
Extinction of a species may come suddenly when an otherwise healthy species is wiped out completely, as when toxic pollution renders its entire habitat unliveable; or may occur gradually over thousands or millions of years, such as when a species gradually loses out in competition for food to better adapted competitors.
The shy Australian animals died after only a century of European settlement. Despite the world's last captive thylacine dying in 1936, the secretive animal wasn't declared extinct until 1986.