Figure 2.

Daily patterns in cercarial emergence (mean ± SE, recalculated to 1 h) of Trichobilharzia sp. “peregra” from Radix balthica snails during diel intervals (Sr, sunrise in triangles; D, day in circles; Ss, sunset in diamonds; N, night in squares) under natural photoperiod in field experiments in August 2017 and 2018. Day interval is divided into half and termed as D1 and D2. Note that the mean value of cercarial emergence from two snails is given for the third day of the experiment in August 2017 (see Appendix A Table A1). “ln” refers to ln-transformed number of emerged cercariae per hour.