Circadian rhythms of feeding activity in sea bass, Dicentrarchus labrax L: Dual phasing capacity of diel demand-feeding pattern
Circadian rhythms of feeding activity in sea bass, Dicentrarchus labrax L: Dual phasing capacity of diel demand-feeding pattern
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DOI：
10.1177/074873049501000308
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发表时间：
1995-09-01
影响因子：
3.5
通讯作者：
Zamora, S
中科院分区：
文献类型：
--
作者：
SanchezVazquez, FJ;Madrid, JA;Zamora, S
研究了在受控实验条件下鲈鱼的夜间与白天进食模式，以研究这种二元进食行为的存在。这些动物（六组，每组 4 只，8 条鱼）被放置在充满循环盐水的水箱中，并安装在恒定条件（23.5 摄氏度和 2.4% 盐度）下的“计时实验室”中。鱼可以使用自需喂食器，首先暴露于 12:12 的光周期模式（12 小时光照、70 lx 和 12 小时黑暗、完全黑暗），然后暴露于光：暗 (LD) 脉冲（40 分钟光照，40 分钟黑暗）。通过在第 16 天将光照周期加倍来反转 LD 12:12 周期，并在第 27 天通过将黑暗周期加倍来再次反转。食物需求的昼夜节律与LD周期密切同步，鱼类表现出昼夜模式。在大多数鱼类中，每次逆转时，摄食节律向新的 LD 周期的转变非常快（提前或延迟摄食 12 小时），表明内源昼夜节律的参与较弱。然而，当接受 LD 脉冲时，鱼开始以大约 23 小时的周期自由游动，并根据其先前的行为在亮或暗阶段继续进食。因此，清楚地证明了鲈鱼昼夜摄食模式的二元性，并且昼夜行为似乎并不完全依赖于摄食节律的昼夜节律倒转，因为这种行为模式在超电 LD 脉冲下得到增强。这种双重能力以及从一种阶段到另一种阶段的转变的生态影响迄今为止尚不清楚，需要进一步的现场和实验室研究。
The nocturnal versus diurnal feeding patterns of sea bass under controlled experimental conditions were studied in order to investigate the existence of such a dualistic feeding behavior. The animals (six groups of 4 animals and 8 single fish) were held in tanks filled with recirculating salt water and installed in a ''chronolab'' under constant conditions (23.5 degrees C and 2.4% salinity). The fish were given access to self-demand feeders and first exposed to a photoperiod regime of 12:12 (12 h light, 70 lx, and 12 h dark, complete darkness) and then to light:dark (LD) pulses (40 min light, 40 min dark). The LD 12:12 cycle was reversed by doubling the light period in day 16, and reversed again in day 27 by doubling the dark period. The circadian rhythm of food demand was strongly synchronized with the LD cycle, and fish exhibited both diurnal and nocturnal patterns. In most fish, the shift of the feeding rhythm to the new LD cycle was very fast for each reversal (bringing forward or delaying their feeds 12 h), indicating a weak participation of an endogenous circadian rhythm. However, when submitted to LD pulses, fish began to free-run with a periodicity of about 23 h and kept feeding in the light or dark phase according to their prior behavior. The existence of a dualism in the diel feeding pattern in sea bass was thus clearly demonstrated and it appeared that the diurnal and nocturnal behavior did not depend exclusively on a circadian phase inversion of the feeding rhythms as this pattern of behavior was enhanced under ultradian LD pulses. The ecological implications of such dual capacity and the switch from one type of phasing to another are hitherto unknown and need further field and laboratory investigation.