Table 1.

Summary of parameters for D. magna females: first and second samples

	First sample (7. June 2015)	Second sample (28. June 2015)
Total number of collected females	309	408
Females on sampling day (= day of capture)
Percentage infected females on day of capture	4.8%	38.2%
Number of females with eggs
Uninfected	17	1
Infected	0	0
Average number of eggs in broodpouch
Uninfected	0.383 (± 1.136)	0.027 (± 0.001)
Infected	0 (± 0)	0 (± 0)
Number of females with ephippia
Uninfected	10	0
Infected	0	0
Average body length
Uninfected	2.37 mm (± 0.65)	2.10 mm (± 0.41)
Infected	3.26 mm (± 0.40)	3.21 mm (± 0.40)
Females at the end of the observation period
Percentage infected at the end of observation period	40.1%	88.0%
Number of days for infection to be recognized	13.7 (± 4.9)	10.1 (± 6.79)
Number of clutches prior to parasitic castration	0.89 (± 0.8)	0.09 (± 0.4)

Where appropriate, means ± standard deviations are given