Sensitivity to photoperiod of the terrestrial isopod Armadillidium vulgare (Latreille) during photoperiodic induction of sexual rest

K. NASRI Faculté des Sciences de Bizerte. Laboratoire de Biologie Animale, Zarzouna, 7021, Tunisie Phone: +216 (2) 43 45 66 Fax: +216 (2) 43 45 66

C. SOUTY-GROSSET Université de Poitiers, Laboratoire de Biologie Animale, UMR 6556, “Génétique et Biologie des populations de Crustacés. 40, Avenue du Recteur Pineau, 86022, Poitiers, France Phone: +33 (5) 49 45 39 80 Fax: +33 (5) 49 45 39 80

P. JUCHAULT Université de Poitiers, Laboratoire de Biologie Animale, UMR 6556, “Génétique et Biologie des populations de Crustacés. 40, Avenue du Recteur Pineau, 86022, Poitiers, France Phone: +33 (5) 49 45 39 80 Fax: +33 (5) 49 45 39 80

J. P. MOCQUARD Université de Poitiers, Laboratoire de Biologie Animale, UMR 6556, “Génétique et Biologie des populations de Crustacés. 40, Avenue du Recteur Pineau, 86022, Poitiers, France Phone: +33 (5) 49 45 39 80 Fax: +33 (5) 49 45 39 80

Summary

The characterization of photoperiodic induction of sexual rest in Armadillidium vulgare females (a cosmopolitan species) shows that the photoperiodic curves relating to the cessation of reproduction are representative of long-days type species. Experiments made on photophase maintenance or reduction show that females are sensitive not only to such reduction but also to its magnitude. Furthermore, the photophase value is relative and depends on previous conditions experienced by the female and there is evidence for the existence of a circannual endogenous cycle in A. vulgare.

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Sensitivity to photoperiod of the terrestrial isopod Armadillidium vulgare (Latreille) during photoperiodic induction of sexual rest

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Sensitivity to photoperiod of the terrestrial isopod Armadillidium vulgare (Latreille) during photoperiodic induction of sexual rest

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