Aranda A, Madrid J A, Sánchez-Vázquez F J
Department of Physiology and Pharmacology, Faculty of Biology, University of Murcia, Spain.
J Biol Rhythms. 2001 Feb;16(1):50-7. doi: 10.1177/074873040101600106.
Most animals when presented with food on a periodic basis develop feeding anticipatory activity (FAA). The objective of the present study was to investigate the synchronization of activity rhythms to light and feeding in single goldfish given a single daily meal and exposed to different light regimes. In the 1st experiment, the group of fish fed at the end of the day showed a longer FAA (228 +/- 27 min) than the group fed 1 h after lights-on (97 +/- 31 min). In the 2nd experiment, goldfish under conflicting zeitgebers, LD (T = 26) and feeding (T = 24) cycles, initially synchronized to the light cycle although feeding time gradually assumed greater importance as the experiment progressed. In the 3rd experiment, after altering the feeding cycles by advancing or delaying feeding time by 4 h in LD 0.25:23.75, most goldfish resynchronized to the feeding stimulus and developed FAA. In conclusion, the authors' results revealed that FAA in goldfish is driven by an endogenous timing system that is entrainable by periodic feeding and influenced by the light regime.
大多数动物在定期喂食时会产生进食预期活动（FAA）。本研究的目的是调查在每天喂食一次并暴露于不同光照条件下的单条金鱼中，活动节律与光照和进食的同步情况。在第一个实验中，在一天结束时喂食的鱼群比在光照开启后1小时喂食的鱼群表现出更长的进食预期活动（228±27分钟）（97±31分钟）。在第二个实验中，处于冲突的授时因子（光照周期（T = 26）和进食周期（T = 24））下的金鱼最初与光照周期同步，尽管随着实验的进行，喂食时间逐渐变得更加重要。在第三个实验中，在LD 0.25:23.75中将喂食时间提前或推迟4小时来改变喂食周期后，大多数金鱼重新与喂食刺激同步并产生了进食预期活动。总之，作者的结果表明，金鱼的进食预期活动是由一个内源性计时系统驱动的，该系统可被周期性喂食所调节，并受光照条件的影响。
