Friday, February 15, 2008

Gene flow

The growing global appetite for cheap farmed salmon is imperiling wild fish populations across the planet, scientists warn. The first worldwide assessment of the impact of cultivated salmon on wild stocks found that where native populations encounter salmon farms, the numbers of wild fish crash, on average, by more than 50 percent.

The farmed
fish spread diseases and parasites to wild salmon. Some cultivated escapees also interbreed with the native fish, reducing the ability of their offspring to survive, researchers say.

Outbreeding depression and gene flow in action. From a paper in PLOS this week (paper and summary) as reported on by National Geographic. If you go to the National Geographic website you should check out the blood squirting lizard....

1 comment:

Allegra Bottlik said...

Here's the link to the video of the blood-squirting lizard. http://video.nationalgeographic.com/video/player/animals/reptiles-animals/lizards/lizard_horned_squirtingblood.html