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→Guppies
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=== Guppies === | === Guppies === | ||
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> | 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>http://www.dartmouth.edu/~robertcox/Teaching_files/lecture9.ppt</ref> | ||
This example is not neccessarily related to feedback loops, but clearly demonstrates that sexual selection does not necessarily further and can even ''reduce'' survival. 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> | This example is not neccessarily related to feedback loops, but clearly demonstrates that sexual selection does not necessarily further and can even ''reduce'' survival. 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> | ||