Giunchi Dimitri, Mongini Emanuele, Pollonara Enrica, Baldaccini N Emilio
Dipartimento di Etologia Ecologia Evoluzione, Università degli Studi di Pisa, Via A. Volta 6, 56126, Pisa, Italy.
Naturwissenschaften. 2003 Jun;90(6):261-4. doi: 10.1007/s00114-003-0422-7. Epub 2003 May 15.
Previous experiments on wild rock doves ( Columba l. livia Gmelin) released within their familiar area revealed an evident effect of fast-shifting, although shifted doves, but not controls, tended to orient homeward. Such an outcome suggested a possible influence of the release time per se on the directional choices of the tested doves. In the present study, this hypothesis was investigated by comparing the orientation of slow-shifted birds to that of two control groups released at different times of the day. As would be expected if doves make use of a time-compensated sun compass, the bearings of shifted birds were deflected clockwise with respect to controls. The time of release itself seemed to influence only the scatter of the vanishing bearings of controls. These findings testify to the substantial similarity of clock-shift effects on the initial orientation of rock doves to those on homing pigeons released from familiar sites.
先前在其熟悉区域内放飞野生原鸽（岩鸽指名亚种）的实验表明，快速转移具有明显效果，尽管转移后的鸽子（而非对照组）倾向于朝家的方向定向。这样的结果表明放飞时间本身可能对受试鸽子的方向选择有影响。在本研究中，通过比较缓慢转移的鸽子与在一天中不同时间放飞的两个对照组鸽子的定向，对这一假设进行了研究。如果鸽子利用时间补偿太阳罗盘，那么正如预期的那样，转移鸽子的方位相对于对照组会顺时针偏转。放飞时间本身似乎仅影响对照组消失方位的离散度。这些发现证明了时钟转移对原鸽初始定向的影响与对从熟悉地点放飞的信鸽的影响有很大相似性。
