World’s Strangest

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Yeti Crab, the Gardener of Bacteria

crab has got a green thumb … er, make that white , hairy claw.

Marine ecologist Andrew Thurber, who was studying a new species of yeti
crab (named after the hair-like brisles on its claws) called Kiwa
discovered that the crustacean is also an avid gardener:

The bristles that cover the crab’s claws and body are coated
in gardens of symbiotic bacteria, which derive energy from the inorganic
gases of the seeps. The crab eats the bacteria, using comb-like mouthparts
to harvest them from its bristles.

The bacteria in K. puravida gardens are closely related to species
that live in other cold seeps and hot hydrothermal vents all over the
world. “It looks like the bacteria may use the seeps as stepping
stones, to create this global connected population that consumes the
energy coming out of seeps and vents,” says Thurber.

Thurber thinks that K. puravida waves its claws to actively farm
its bacterial gardens: movements stir up the water around the bacteria,
ensuring that fresh supplies of oxygen and sulphide wash over them and
helping them to grow. “This ‘dance’ is extraordinary and comical,”
says Van Dover. “We’ve never seen this strategy before.”

Nature News has the story and the video clip: Link

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December 4th, 2011

Stranger to the World


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