Worms open route to whale bones

Geoff Read g.read at niwa.co.nz
Sun Sep 14 21:26:55 EST 2003


"It's a new polychaete, a new genus and species, and we think it's unique to
whale falls."

See also: 
http://www.mbari.org/expeditions/Whale/August%206th,%202003.htm
http://www.mbari.org/expeditions/Whale/August%207th,%202003.htm

SCIENCE, Volume 301, Issue 5639,  
dated September 12 2003

www.sciencemag.org

Report from: 4TH INTERNATIONAL SYMBIOSIS SOCIETY CONGRESS:

"About 2 years ago, Shana Goffredi and her colleagues came across sunken 
treasure on the sea floor of California's Monterey Bay. It wasn't gold coins 
that got them excited but the body of a recently dead whale lingering on the 
sea floor 3000 meters deep. "It's one of the deepest known whale falls," and 
deeper than most scavenger fish dare to go, said Goffredi, a marine biologist 
at the Monterey Bay Aquarium Research Institute in Moss Landing.  

Using a remotely operated sub, the researchers discovered what appeared to be 
a carpet of red fuzz on the whale's corpse. That fuzz proved to be thousands 
of polychaetes, segmented worms typically found in marine mud. The worms' red 
plumes stuck out about 6 centimeters into the water and, with about 25 
individuals per square centimeter, gave the carcass a rosy tint. "It's a new 
polychaete, a new genus and species, and we think it's unique to whale falls," 
Goffredi reported at the meeting.  

No one was surprised by the worm's plumes, typical "tentacles" that filter 
food from the water. But in addition, "the worms just riddled the [whale] 
bones with strange roots," Goffredi said. Surprisingly, the roots were chock- 
full of bacteria. She wondered whether the bacteria played a role in making 
the bones fragile and soft, and how the microbes secured a safe haven in the 
worms' roots. "The question is, Is [the microbe] a symbiont?" she asked.  

One bit of evidence for symbiosis was that "the worm doesn't appear to have a 
functional mouth or gut," Goffredi said; "it has no way to feed itself." Thus 
the worm probably relies on carbon compounds produced by the bacteria as they 
feast on oil oozing out of the whale bones.  

In return for this nourishment, specialized cells in the worms' roots provide 
housing for the bacteria. Goffredi, Greg Rouse of the South Australian Museum 
in Adelaide, and their colleagues found none of these microbes outside the 
roots. And the worm "probably provides oxygen," via a blood vessel extending 
into the roots, she added.  

Molecular analyses support the idea that the microbes feast on whale oil. They 
are related to bacteria that thrive in oil-contaminated soil, where they "eat" 
hydrocarbons. If it is truly a symbiont, this microbe would be the first 
hydrocarbon degrader known to form any symbiotic relationship, Goffredi 
reported.  

"One of the exciting things ... in the deep sea is you find new creatures, 
sometimes very weird ones," says Charles Fisher, a marine biologist at 
Pennsylvania State University, University Park. "If the environment requires 
unique adaptations that cannot be accomplished via one organism, then almost 
certainly two or more organisms will find a way to make it work."

 Volume 301, Number 5639, Issue of 12 Sep 2003, p. 1467.
Copyright The American Association for the Advancement of Science. 

 -- 
Geoff Read <g.read at niwa.co.nz>
 http://www.annelida.net/  

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