THE IMPACT OF NOCTURNAL LIGHT-PULSES ON THE ACTIVITY PATTERN OF TERRESTRIAL SNAILS (HELIX-LUCORUM) ENTRAINED TO A PHOTOPERIOD OF 12 H LIGHT/12 H DARK

被引:6
作者
FLARI, V
LAZARIDOUDIMITRIADOU, M
机构
来源
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE | 1995年 / 73卷 / 07期
关键词
D O I
10.1139/z95-145
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
The effects of nocturnal light pulses, ''asymmetrical skeleton photoperiod regimes,'' on the circadian locomotor activity rhythm in adults of the edible snail Helix lucorum previously entrained to a photoperiod regime of 12 h light : 12 h dark were examined. In all experiments the snails showed a clear bimodal rhythm of behaviour, with peaks at both dusk and dawn. Shifts occurred according to the timing of 2-h light pulses applied in the scotophase and were related to the phase of snails' entrained rhythms. It is suggested that a minimum dark period (up to 10 h) is necessary for H. lucorum to retain its normal daily rhythmicity.
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页码:1214 / 1220
页数:7
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