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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Guppies Where You Least Expect Them
21 February 2013 4:00 pm
Chalk up another conquest for the humble guppy. The tiny, brightly colored South American fish has long been a favorite of aquarium owners, and is also one of Earth's most successful invasive species, having expanded its range to every continent except Antarctica. Now, the guppy (Poecilia reticulata) has seized some unlikely new territory: It is the first freshwater fish ever found on the Cape Verdean archipelago, a chain of ten parched volcanic islands off the west coast of Africa. Just one of the drought plagued islands has streams that run year-round, researchers report in the current issue of African Zoology, and the only known freshwater animals were invertebrates such as snails and dragonflies. In late 2011, however, researchers from the University of Bern in Switzerland discovered guppies swimming in a concrete irrigation reservoir on the island of Santa Antão. The fish might have been imported by a pet lover, the researchers speculate. And it's not too soon to consider ways of eliminating the invaders, they add, because rapidly multiplying guppies are a well-known threat to native species.
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