Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Hydrodynamics of the sea anemone Anthopleura xanthogrammica
Student Author(s): Stoller, David
Faculty Advisor(s): Burnett, Robin
Pages: 20
Location: Final Papers Biology 175H
Date: June 1975
Keywords: sea anemones
Abstract: 1. Anthopleura xanthogrammica, in an unstimulated state, maintaines a positive coelenteric pressure whose mean is 10.0 mm of sea water (n=13). In response to prodding a maximum pressure of 30 mm of sea water was measured. The high maintained pressure, relative to that of Metridium senile, may have adaptive significance. 2. Rhythmic oscillations of flow have been observed. Evidence indicates that deflation is muscularly controlled and inflation is not. 3. Evidence suggests that a pressure is important for particular positional configuration and that there is some regulatory mechanism, perhaps stretch of pressure receptors in the body wall. 4. There is transport (not simple diffusion) of tritiated water through the body wall into the coelenteron. Possibilities of sodium and/or water pumps exist. Transport of water throught eh body wall challenges present theory of anemone hydrodynamics. 5. A final theory of water movement through the body wall is presently not submittable because of conflicting results of movement of tritiated and non-tritiated water.