the alteration and disturbance of a site by living organisms; the turning and mixing of sediments by organisms, as rodents. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
bioturbation   (bī'ō-tər-bā'shən)  Pronunciation Key 
The stirring or mixing of sediment or soil by organisms, especially by burrowing, boring, or ingestion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ensuring confidence in radionuclide-based sediment chronologies and
  bioturbation rates.
Sediment bioturbation will generally improve degradation rates of organic
  compounds through oxygenation of surface sediments.
While benthic infauna have recolonized the cap, there is not indication of cap
  breach due to bioturbation.
Bioturbation by crabs or burrowing shrimp may also be a problem.
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