What Caused The Coloration Differences Of The Guppies? As turbidity decreases in the pools Endler collected guppies from, the number of predators decrease and the number of bright colored guppies increases. Therefore, the trends in the coloration of guppies is caused by the turbidity of the water. Why do some guppies tend to be more
What Did John Endler Study? When evolutionary biologist John Endler began studying Trinidad’s wild guppies in the 1970s, he was struck by the wide variation among guppies from different streams, even among guppies living in different parts of the same stream. … His results would prove to be one of evolutionary biology’s most important discoveries.
What Factors Caused The Variation In The Colors Of The Guppies? What factors caused the variation in the colors of the guppies? The color patterns of male guppies are influenced by both sexual and natural selection (Endler 1978, 1983). Sexual selection (female mate choice) often (although not always) favors more colorful males (Houde 1987; Endler