Figure 5.  In-faunal deposit feeders rework sediments with a complex network of burrows, thereby irrigating sediments and exposing them to oxygen rich waters and more favorable thermodynamic conditions (left, right).  Acorn worms, a hemichordate infaunal deposit feeder, burrowed into this microcosm leaving a complicated array of conduits (left).  Sample is 6 cm in diameter.  Samples from St. George’s Island, Florida contained evidence of multiple burrows. Sample is 2.5 cm in diameter. In both figures, the mud is made transparent to display the burrows (right).

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