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Biol Bull 137: 239-249. (October 1969)
© 1969 Marine Biological Laboratory
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CONTINUOUS AND RHYTHMIC REPRODUCTIVE CYCLE OBSERVED IN PERIPLANETA AMERICANA (L.)

WILLIAM J. BELL 1

1 Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, 19104

1. The 5-day reproductive cycle of Periplaneta is continuous with an ootheca being formed every fifth day. The rate of yolk formation is lowest during ootheca formation(day 1) and reaches a peak during days 3 and 4.

2. Vitellogenic blood protein levels fluctuate between 1 and 6 µg/µl and their concentrations correlate with the rate of yolk formation. The two vitellogenins oscillate synchronously during the cycle.

3. The total blood protein concentration increases to 80 µg/µl on day 5, decreases abruptly to 52 µg/µl when ootheca formation is initiated, and increases gradually to the concentration peak on day 5. The changes in total blood protein concentration are not obviously correlated with the vitellogenic cycle.

4. Changes in blood volume occur during the cycle, and these changes amplify rather than diminish the blood protein fluctuations.

5. A hiatus in food consumption is observed during ootheca formation; feeding is resumed after the third day following oviposition.






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Copyright © 1969 by the Marine Biological Laboratory.