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Biol Bull 120: 353-359. (June 1961)
© 1961 Marine Biological Laboratory
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CHANGES IN ABUNDANCE OF THE COMMENSAL CRABS OF CHAETOPTERUS

I. E. GRAY 1

1 Department of Zoology, Duke University, Durham, North Carolina

1. The relative abundance of two species of commensal crabs of Chaetopterus, Pinnixa chaetopterana and Polyonyx macrocheles, has been determined in the regions of Clearwater, Florida; Beaufort, North Carolina; and Woods Hole, Massachusetts. The marked changes in relative abundance of the two crabs that have occurred during the last half century at Beaufort and Woods Hole are discussed.

2. Comparative observations on the life-history and ecology of the two crabs are recorded.

3. Pinnixa is considered a facultative commensal and Polyonyx an obligate commensal of Chaetopterus.






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Copyright © 1961 by the Marine Biological Laboratory.