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Sexual selection: Difference between revisions
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== Sexual selection can increase but also decrease fitness == | == Sexual selection can increase but also decrease fitness == | ||
{{See also|{{W|Functional extinction}}}}Biologist John Endler conducted an experiment with Guppies (''Poecilia'') in a tank without predators. The female fish selected males who had strong contrast to the background as they stood out during mate selection. This then made the fish more visible to predators later reintroduced into the same tank.<ref>https://link.springer.com/chapter/10.1007/978-94-015-7682-6_7</ref><ref>[https://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt http://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt]</ref> This clearly demonstrates that sexual selection does not necessarily further and can even ''reduce'' survival ([[fitness]]). | {{See also|{{W|Functional extinction}}}}Biologist John Endler conducted an experiment with Guppies (''Poecilia'') in a tank without predators. The female fish selected males who had strong contrast to the background as they stood out during mate selection. This then made the fish more visible to predators later reintroduced into the same tank.<ref>https://link.springer.com/chapter/10.1007/978-94-015-7682-6_7</ref><ref>[https://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt http://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt]</ref> This clearly demonstrates that sexual selection does not necessarily further and can even ''reduce'' survival ([[fitness]]). | ||
Related to this, one study showed men who have lots of sex were not healthier than others by various metrics.<ref>http://rsos.royalsocietypublishing.org/content/4/1/160603</ref> | Related to this, one study showed men who have lots of sex were not healthier than others by various metrics.<ref>http://rsos.royalsocietypublishing.org/content/4/1/160603</ref> | ||
== Human beings are less effected by sudden environmental changes == | == Human beings are less effected by sudden environmental changes == | ||
Technology and human [[IQ|intelligence]] has evolved to the point sudden environmental changes, such as natural disasters, global warming, weekly weather changes, etc. Don't effect us as much as every other animal, due to our ability to forecast and plan for the future. | Technology and human [[IQ|intelligence]] has evolved to the point sudden environmental changes, such as natural disasters, global warming, weekly weather changes, etc. Don't effect us as much as every other animal, due to our ability to forecast and plan for the future. | ||
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Lastly, there is ''group selection'', i.e. selection based on how the individual affects the survival and reproduction of entire groups. If a mutation results in better group survival, then that mutation may stick around because it may also (slightly) increase the individual's reproductive success. The effects of group selection are believed to be small compared to kin, sexual and environmental selection. | Lastly, there is ''group selection'', i.e. selection based on how the individual affects the survival and reproduction of entire groups. If a mutation results in better group survival, then that mutation may stick around because it may also (slightly) increase the individual's reproductive success. The effects of group selection are believed to be small compared to kin, sexual and environmental selection. | ||
=See also= | ==See also== | ||
* [[Evolution]] | * [[Evolution]] | ||
*[[Fisherian runaway]] | *[[Fisherian runaway]] | ||