Schneider Hans
Zoologisches Institut der Universität Bonn, Bonn, Deutschland.
Oecologia. 1971 Sep;8(3):310-320. doi: 10.1007/BF00346477.
In 1969 and 1970 calling and chorusing of the tree frog, Hyla a. arborea, was recorded daily, together with air temperature and light intensity. The onset of calling occured during the first days of May at 7.45 p.m. and shifted to about 9 p.m. during June and July. The treefrogs began calling at a light intensity of lower than 260 Lux and chorused at less than 60 Lux, provided the air temperature was above 8°C, which is the lower limit for calling activity. The start of the daily calling activity is controlled by the light intensity and by an annual endogenous rhythm. The effect of the rhythm is 6 to 10 times greater than that of the light intensity.
1969年和1970年，每天都记录了欧洲林蛙（Hyla a. arborea）的鸣叫和合唱情况，同时记录了气温和光照强度。鸣叫始于5月初的晚上7点45分，6月和7月时则转移到晚上9点左右。只要气温高于8°C（鸣叫活动的下限），欧洲林蛙在光照强度低于260勒克斯时开始鸣叫，在低于60勒克斯时合唱。每日鸣叫活动的开始受光照强度和年度内源性节律控制。节律的影响比光照强度的影响大6至10倍。
