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Latest Guppy Stories

They Call It 'Guppy Love'
2011-11-25 04:34:35

UCLA biologists solve an evolution mystery Guppies in the wild have evolved over at least half-a-million years – long enough for the males' coloration to have changed dramatically. Yet a characteristic orange patch on male guppies has remained remarkably stable, though it could have become redder or more yellow. Why has it stayed the same hue of orange over such a long period of time? Because that's the color female guppies prefer. "Sometimes populations have to evolve just to...

Fish Jump Into Picture Of Evolutionary Land Invasion
2011-10-10 04:26:32

Research sometimes means looking for one thing and finding another. Such was the case when biology professor Alice Gibb and her research team at Northern Arizona University witnessed a small amphibious fish, the mangrove rivulus, jump with apparent skill and purpose out of a small net and back into the water. This was no random flop, like you might see from a trout that´s just been landed. The rivulus seemed to know what it was doing. They hadn´t expected to see that behavior,...

2010-12-23 17:31:03

When prowling for a hook up, it's not always the good-looker who gets the girl. In fact, in a certain species of South American fish, brawn and stealth beat out colorful and refined almost every time. In a series of published studies of a South American species of fish (Poecilia parae), which are closely related to guppies, Syracuse University scientists have discovered how the interplay between male mating strategies and predator behavior has helped preserve the population's distinctive...

2010-10-22 00:43:31

Working on guppies, UC Riverside biologist finds that adults compensate for their poor early start through adaptive changes Does the environment encountered early in life have permanent and predictable long-term effects in adulthood? Such effects have been reported in numerous organisms, including humans. But now a biology graduate student at the University of California, Riverside reports that how individuals fare as adults is not simply a passive consequence of the limits that early...

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2010-07-21 11:31:31

Study on guppies sheds light on long-term costs of early rapid growth and weight gain University of California, Riverside biologists working on guppies "“ small freshwater fish that have been the subject of long-term studies "“ report that rapid growth responses to increased food availability after a period of growth restriction early in life have repercussions in adulthood. Based on their experiments, the biologists found that female guppies that grew rapidly as juveniles...

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2010-02-05 08:40:00

In the natural stream communities of Trinidad, guppy populations live close together, but evolve differently. Upstream, fewer predators mean more guppies but less food for each; they grow slowly and larger, reproduce later and less, and die older. Downstream, where predators thrive, guppies eat more, grow rapidly, stay small, reproduce quickly and die younger. While it is clear to ecologists that an ecosystem shapes the evolution of animals living in it, population biology experts such as...

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2010-02-02 07:12:41

Research findings introduce fundamental shift in how biologists perceive relationship between evolution and ecology Biologists have known for long that ecology, the interaction between organisms and their environment, plays a significant role in forming new species and in modifying living ones. The traditional view is that ecology shapes evolution. The environment defines a template and the process of evolution by natural selection shapes organisms to fit that template. Some specialized...

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2009-06-10 15:35:00

How fast can evolution take place? In just a few years, according to a new study on guppies led by UC Riverside's Swanne Gordon, a graduate student in biology.Gordon and her colleagues studied guppies "” small fresh-water fish biologists have studied for long "” from the Yarra River, Trinidad. They introduced the guppies into the nearby Damier River, in a section above a barrier waterfall that excluded all predators. The guppies and their descendents also colonized the lower...

2009-06-08 14:11:10

U.S. scientists looking at adaptation and survival in a wild population found guppies can adapt to new surroundings in just a few years. A research team led by Swanne Gordon from the University of California-Riverside found guppy populations introduced into new habitats developed new and advantageous traits in just a few years. Gordon and colleagues studied 200 guppies that had been taken from the Yarra River in Trinidad and introduced into two different environments in the nearby Damier...


Word of the Day
grass-comber
  • A landsman who is making his first voyage at sea; a novice who enters naval service from rural life.
According to the OED, a grass-comber is also 'a sailor's term for one who has been a farm-labourer.'