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Biol Bull 118: 129-136. (February 1960)
© 1960 Marine Biological Laboratory
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LOW TEMPERATURE BLOCKAGE OF MOLTING IN UCA PUGNAX

L. M. PASSANO 1

1 Department of Zoology, Yale University, New Haven, Connecticut

1. A uniform population of male Uca pugnax was used in studying the effect of 10 temperatures on proecdysis resulting from eyestalk removal.

2. Proecdysis duration is shortest at 29° to 32° C. and lengthens significantly at lower temperatures.

3. Proecdysis initiation is markedly temperature-sensitive. At 15° or below initiation is completely blocked; at 15° to 20° a substantial proportion of the crabs fail to begin proecdysis.

4. Temperatures which block proecdysis initiation also block basal limb bud regeneration (a molt-independent growth process) . It is hypothesized that a metabolic event common to both processes is being blocked.

5. The physiological and ecological significance of the proecdysis temperature block is considered.






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Copyright © 1960 by the Marine Biological Laboratory.