Sample sizes of the field experiment to study the effect of photostimulation on laying dates in wild living great tits (Parus major).

We created 3 experimental groups: (i) photostimulated females (ii) females which experienced natural day length in captivity and (iii) females which experienced natural day length in the field. Females from group (i) and (ii) were kept indoors for one day and two nights after which they were released in the field at the location where they were caught.我们设立了3组实验雌性个体：(i) 经光刺激处理的个体（photostimulated females）；(ii) 于人工圈养环境中暴露于自然日照时长的个体；(iii) 于野外环境中暴露于自然日照时长的个体。其中第(i)组与第(ii)组的个体先在室内饲养1天2夜，随后在其原始捕获地点被放归野外。