Sentences with phrase «guppy researcher»

Veteran guppy researcher John Endler of the University of California, Santa Barbara, agrees that this is one of several possible explanations.

Not exact matches

In the study researchers selected guppies for large and small brain sizes.

Researchers in Hawaii found that guppies released in the 1920s drove down native fish populations, perhaps by competing with them for food and living space, and had likely changed the cycle of nutrients in water: Guppy - rich areas showed increased levels of dissolved nitrogen — from ammonium in fish urine and gill excretions — which, in turn, stimulated algae growth.

Although the benefits and risks of guppy releases may be highly context - dependent, some researchers are simply taking a hard line.

Led by Dr. Gregor Rolshausen, then a postdoctoral researcher at McGill working with Prof. Andrew Hendry, the team went to study the guppy fish living in polluted areas, comparing their morphology and genetic makeup to those of similar guppies from non-polluted parts of Trinidad.

Fish from high - predation environments also reproduced for longer periods than did guppies from low - predation regions, again contradicting the conventional view, the researchers report in the 28 October issue of Nature.

Moreover, the guppies extend their gestation during the exact period when their offspring are maturing their feeding capabilities most quickly, said lead author Terry Dial, a postdoctoral researcher in ecology and evolutionary biology at Brown University.

The latest salvo in Macro-Nutrient Land is the Calorie Restriction Diet, inspired by animal experiments in which mice, guppies, water fleas, yeast, spiders, Labrador retrievers, a microscopic water invertebrate called the rotifer, and rhesus monkeys are said to live longer on diets that restrict caloric intake.13 Researchers are encouraged by the longevity of a single monkey who has reached 38 years on a diet in which the portion of monkey chow — dried compressed pellets of wheat, corn, soybean, alfalfa, fish and brewer's yeast — has been cut by 30 percent compared to controls.