Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Osmoregulation and salinity tolerance in the Polychaete annelid Cirriformia spirabrancha (Moore, 1904)
Student Author(s): Dice, James F.
Faculty Advisor(s): Lee, Welton
Pages: 31
Location: Final Papers Biology 175H
Date: June 1968
Keywords: Polychaete worm
Abstract: 1) Cirriformia spirabrancha (Moore, 1904) maintains its coelomic fluid slightly hyperosmotic to the blood over the range of salinities tested. 2) The salinity tolerance limits of C. spirabrancha as determined by the LD50 values are 23% and 220% sea water. These limits were slightly reduced for worms placed in the external medium without substrate. 3) Volume changes for animals in various concentrations of sea water and sucrose indicate that this polychaete reaches equilibrium to hyperosmotic media by a means not totally dependent upon water loss. This property may account for the observed tolerance to high salinities.
Notes: Publ 1969, Comp. Biochem. Physiol. 28: 1331-1343