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Journal of Experimental Biology 56,215-221 (1972)
Published by Company of Biologists 1972

The Corpus Allatum and Oogenesis in Rhodnius Prolixus (Stål.) : II. The Effects of Starvation

G. E. PRATT ¹ and K. G. DAVEY ²

¹ Institute of Parasitology of McGill University, Box 231, Macdonald College P.O., P.Q., Canada; ARC Unit of Invertebrate Endocrinology, Chemical Laboratory, University of Sussex, Brighton, U.K.
² Institute of Parasitology of McGill University, Box 231, Macdonald College P.O., P.Q., Canada

1. In females which have been re-fed after various periods of fasting there is a delay in the resumption of ovarian growth which becomes greater with longer periods of starvation.

2. In females kept without food for 28 days before re-feeding, vitellogenesis is not resumed until 4 or 5 days after the meal, whereas the concentration of yolk antigen in the haemolymph returns to its normal level by the third day after the meal.

3. A period of starvation induces an accumulation of oocytes in the size range below that of activation until the fourth or fifth day after re-feeding, when the terminal oocytes pass rapidly through the critical size range and enter vitellogenesis.

4. The tropharia of starved females exhibit a remarkably reduced affinity for the protein stain Ponceau S, and enlarged trophocytes with their characteristic inclusions are absent during the first 6 days after re-feeding.