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| Critical Photoperiod and Sensitive Light Intensity of Diapause Induction in Parthenogenetic Artemia (Crustacea:Anostraca) from Aibi Lake,China |
| HE Tingting,WANG Zhichao,CHENG Yong,HE Jiangtao,ZHOU Yafei,LU Xipeng,MEI Jingnan |
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Abstract The embryonic development of A rtemia follows two modes :oviparity with production of encys‐ted diapause embryos (cysts ,diapause mode) and ovoviviparity with release of live nauplii (nondiapause mode) .Recent results show that photoperiods probably is the major token stimuli in A rtemia diapause in‐duction .It is meaningful to get critical photoperiod and sensitive light intensity in A rtemia culture .With this purpose ,critical photoperiod and sensitive light intensity were assayed using a parthenogenetic A r‐temia from Aibi Lake (Xinjiang ,China) a laboratory at a salinity of 80 at 25 ℃ .The photoperiodic re‐sponse curves of this population showed similarity with typical long‐day species of insect with a critical dark length of (8 .38 ± 0 .37) h (base on the data except the constant light and constant dark group ) .A‐bout the two extreme situations ,the diapause incidence was (32 .42 ± 6 .70)% ,significantly lower than other nearby long darkness photoperiods (P<0 .01) under constant darkness ,and the diapause incidence (19 .01 ± 5 .98)% was slightly higher at constant light than other nearby short darkness photoperiods , without significant difference ( P> 0 .05) .Sensitive light intensity experiment under long‐photoperiods (18L∶6D) showed that the sensitive light intensity of this population perhaps lied between 10 lx and 50 lx .All these findings are important for understanding of A rtemia diapause induction ,with practical appli‐cations for management of A rtemia reproduction under control .
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Received: 25 June 2016
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