By Eric T. Pengelley
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Res. 36, 708-724. C. L. ( 1 9 7 0 ) . C i r c a n nian rhythms - I. R e p r o d u c t i o n in the cave c r a y f i s h , Orconectes yellucidus inermis. C o m p . B i o c h e m . P h y s i o l . 3 3 , 347-355 . E. (1970). Comparative survivorship and fecundity of m i c t i c and a m i c t i c female r o t i f e r s . P h y s i o l . Zool . 4 3 , 206-212 . P E N G E L L E Y , E . T . & F I S H E R , K . C . ( 1 9 6 3 ) . The effect of t e m p e r a t u r e and p h o t o p e r i o d on the yearly h i b e r n a t i n g b e h a v i o r of c a p t i v e g o l d e n - m a n t l e d ground s q u i r rels {Citellus lateralis tescorum) .
C i r c a n n u a l r h y t h m s I. F r e e - r u n n i n g r h y t h m s in growth and d e v e l o p m e n t of the m a r i n e c n i d a r i a n , Campanulavia flexuosa. C o m p . B i o c h e m . & P h y s i o l . , in p r e s s . A. ( 1 9 7 4 b ) . C i r c a n n u a l rhythms I I . Temperature-compensated free-running rhythms in growth and d e v e l o p m e n t of the m a r i n e c n i d a r i a n , Campanulavia flexuosa. C o m p . B i o c h e m . & P h y s i o l . , in p r è s s. A. (1974c).
On the c o n t r a r y , g e r o n t o 1 o g i s t s have e m p h a s i z e d that a fixed longevity is c h a r a c teristic of each animal species (Comfort, 1964). For P o i k i l o t h e r m i e i n v e r t e b r a t e s , it m u s t b e added t h a t the mean life spans are thought to be i n v a r i a b l e so long as the e n v i r o n m e n t remains c o n s t a n t . In view of the general acceptance of t h e concept of s p e c i fic a g e , it is n o t s u r p r i s i n g that c o n t r a d i c t i o n s e i t h e r have n o t b e e n raised p r e v i o u s l y or have b e e n d i s m i s s e d .