guppies

How new species evolve is focus of public lecture at UC Riverside

...nisms. In addition, his lab conducts experiments for testing predictions from different facets of modern evolutionary theory in natural populations of guppies (small fresh-water fish that biologists have studied for long). Reznick decided to take up a career devoted to evolutionary biology when he was a s...

guppies in Biological News

Female guppies risk their lives to avoid too much male attention

Sexual harassment is a burden that females of many species face, and some may go to extreme lengths to avoid it. In a new paper from the June issue of the American Naturalist, Darren Croft (University of Wales) and a research team from the University of Leeds suggest that female guppies, a popul...

When evolution is not so slow and gradual

...he University of California, Riverside studied 200 guppies that had been taken from the Yarra River in Trinid... their introduction, the team revisited the Damier guppies to see what adaptive changes they might have picke...d the new population to survive. So they took more guppies from the Yarra, marked them, and put them in the D...

Sexual harassment from males prevents female bonding, says study

...assment may limit the opportunities for females to form social bonds across a range of species" The research team worked with a population of wild guppies in Trinidad, isolating the females and introducing males to change the sex ratio and examining the effect of males on female social behaviour. They ca...

American Chemical Society's Weekly PressPac -- Sept. 24, 2008

...25 years, is giving scientists precious new information about how Mother Nature forms shells, bones, and other hard structures in animals ranging from guppies to mice. That information on "biomineralization" could form a knowledge base for understanding bone loss in humans and even snaring the Holy Grail of ...

Fish evolve a longer lifespan by evolving a longer reproductive period, researchers find

... have studied for long, the researchers found that guppies living in environments with a large number of pred...ors have adapted to reproduce earlier in life than guppies from low-predation localities. Moreover, when reproduction ceases, guppies from high-predation localities are far older, on a...

Getting an evolutionary handle on life after reproduction

...itness. They expand on their ongoing investigations of the life history of guppies confronting different predatory threats in Trinidad. Individuals facing dif...tion, and patterns of senescence, including declines in reproduction. Since guppies are livebearers that provide no postnatal maternal care, Reznick et al. pre...