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In the study, the researchers made robotic guppies to see how the real guppies would react.
Even though guppies grow to be only about 2-1/2" long, they still need plenty of space to swim around in.
Even as the guppies grew more cautious overall when faced with higher stress levels, differences in individual personalities persisted.
Biologists have long known that female Poecilia reticulata guppies store sperm.
UCLA's Kerry Deere, the lead author of the study, conducted experiments in which she presented female guppies (Poecilia reticulata) with a choice of males with low, medium and high levels of drosopterin to see which males they preferred.
The data collected show clear differences between the response of a single guppy and the responses of guppies in a group of four to the presence of a real predator, the pike cichlid (Figure 1).
In a study on wild populations of guppies in the rainforest of Trinidad, Dr Croft and his colleagues found that female guppies swim in habitats that contain predators but few males.
The fish used in this study were healthy, wild-type guppies (Poecilia reticulata) imported from Colombia and bred through several generations in 500-L stainless-steel tanks at 25 [+ or -] 2 [degrees] C and a daily 12-hr simulated daylight illumination.
Some of the most gorgeous guppies were hopelessly drawn to fish with black splodges and tiny tails because, scientists believe, they were "unusual" and as a result eye-catching.
Both the guppies and the black mollies are closely related to the swordtails, platys and mosquito fish.
"But it's a survival mechanism which serves guppies well in their native South America."
We further evaluated this theory by manipulating the kind of predation that guppies were exposed to (Reznick and Bryga 1987; Reznick et al.
Reznick explained that male guppies are brightly colored and very variable in coloration.
That's the conclusion of a new study of asymmetric male guppies flirting with females in adjoining tanks, says Mart R.
Washington, Nov 24 (ANI): Though guppies, also known as the millionfish, have evolved over at least half-a-million years, yet a characteristic orange patch on the male fish has remained remarkably stable, though it could have become redder or more yellow.
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