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Biol Bull 76: 121-126. (February 1939)
© 1939 Marine Biological Laboratory
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EXPERIMENTS ON LIGIA IN BERMUDA

VI. REACTIONS TO COMMON CATIONS

T. CUNLIFFE BARNES 1

1 From the Osborn Zoölogical Laboratory, Yale University, and the Bermuda Biological Station

1. The negative reaction of Ligia to filter paper moistened with frac58 M NaCl is similar to the negative reaction to sea water. In both cases dilution by 50 per cent destroys the effect.

2. The aversion for filter paper containing KCl and NaCl is approximately a rectilinear function of the concentration.

3. The results can be explained by the assumption that the ions stimulate the legs and the greater activity results in a distribution on the salt-free side of the substratum.

4. When presented with a "choice" between filter paper containing CaCl2 and NaCl, there is an "all-or-none" aversion for the NaCl.

5. The survival of Ligia in sea water containing increasing concentrations of Na, K and Ca is described.

6. The survival in distilled water or in solutions of single salts is not affected by oxygenation.






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Copyright © 1939 by the Marine Biological Laboratory.