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Biol Bull 135: 563-573. (December 1968)
© 1968 Marine Biological Laboratory
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PEDAL EXPANSION IN THE NATICID SNAILS. II. LABELLING EXPERIMENTS USING INULIN

W. D. RUSSELL-HUNTER 1 and MARTYN L. APLEY 2

1 Department of Zoology, Syracuse University, Syracuse, New York 13210
2 Department of Invertebrate Zoology, Marine Biological Laboratory, Woods Hole, Massachusetts 02543

1. Inulin-labelled sea water has been used in an investigation of the pedal water-sinus system, and other water spaces, in Polinices duplicatus. Analyses were by a photometric measurement of the reaction of inulin hydrolysate with resorcinol.

2. Of the sea water uptake during expansion: about 90% enters the pedal water-sinus system, about 5-7% is water which rapidly circulates through the mantle-cavity, and about 2% is superficial water on the snail's shell and expanded surfaces.

3. When the snail is in the contracted state a residual volume of sea water is retained in the pedal water-sinus system, and this can amount to 12.8% of the volume of the pedal system in the expanded snail.

4. There is no exchange between the water-sinus system and the blood at any time and, in the fully expanded snail, little or no exchange between the system and the environmental sea water. Labelling showed that 49-71% of the pedal sea water could remain unexchanged after 72 hours.

5. The surprisingly "stagnant" nature of the sea water in the pedal water-sinuses is discussed. Physiological consequences are probably slight, though, under certain ecological conditions, the large static water content is responsible for an unusual condition of temporary hyperthermia. A hypothesis, that little energy is expended by a Polinices in remaining fully expanded, is coupled with evidence of traumatic change in behavior resulting from sustained contraction. It seems likely that the features of water spaces and exchange rates demonstrated in Polinices duplicatus would be similar in any large naticid.




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