Giant Balls of Bacteria Pile Up on Arctic Lake Beds

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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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Greehouse Gas Feedback Loop Discovered in Freshwater Lakes - Up to 77% of the methane emissions from an individual lake are the result of the organic matter shed primarily by plants that grow in or near the water. This matter gets buried in the sediment found toward the edge of lakes, where it is consumed by communities of microbes. Methane gets generated as a byproduct, which then bubbles up to the surface.

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