... it is possible that AGS are entraining their rhythms to changes in the intensity of light across the polar day, daily changes in the spectral composition of light are more consistent and less sensitive to cloud cover, and may therefore be a more prominent zeitgeber ( Ashley et al., 2013 ; Krüll et al., 1985...

...) activity under the influence of cyclic pressure and ‘remember’ the tidal cycle from the field for 1.5 days. STST North Sea Zeitgeber Tidal trigger Migration and distribution patterns of marine organisms are often closely connected to oceanic and tidal currents. In addition to long-distance...

... subsequently recovered, whereas plasma 3,5,3′-triiodo-L-thyronine (T 3 ) levels were not substantially affected by either photoperiod or temperature. There was no consistent pattern of change in plasma cortisol levels. The results do not provide support for the role of temperature as a zeitgeber, but do...

... salmon parr subsampled from a common stock. The significance of this is discussed. The data suggest that the lunar cycle acts as a Zeitgeber for synchronization of the growth rate rhythms. 06 01 1987 © 1987 by Company of Biologists 1987 teleost fish Zeitgeber growth lunar cycles...