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Giant Balls of Bacteria Pile Up on Arctic Lake Beds
Arctic lakes are stark environments full of extremes. The creatures that live in them must endure blasting ultraviolet radiation for 24 hours a day in the summer, months of icy darkness in the winter, and low levels of life-sustaining nutrients. Still, some manage to survive and even flourish under those severe conditions: Take, for example, the sea tomato.

Sea tomatoes are round, plump colonies of toxin-producing cyanobacteria. Scientists reported last week that they have recently observed sea tomatoes stacking up on some Greenland lake bottoms like tomatoes piled haphazardly on a grocery display.



 
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Native Species or Invasive? The Distinction Blurs as the World Warms - With thousands of species on the move as the climate changes, a growing number of scientists say that the dichotomy between native and alien species has become an outdated concept and that efforts must be made to help migrating species adapt to their new habitats.


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