Table 1.

Seasonal and diurnal prevalence of microsporidians in drifted and stationary (Station.) Gammarus pulex clade E for each drift experiment.

Microsporidian parasites	Microsporidian prevalence of drifted Gammarus pulex in %
	October 2021			April 2022			July 2022
	Drifted		Station.	Drifted		Station.	Drifted		Station.
	Day (n = 18)	Night (n = 127)	Day (n = 280)	Day (n = 52)	Night (n = 638)	Day (n = 187)	Day (n = 41)	Night (n = 120)	Day (n = 430)
Dictyocoela duebenum	0	0.79 (1)	0	0	0.47 (3)	0.5 (1)	0	0	0.2 (1)
Dictyocoela sp. H9	0	1.57 (2)	0.4 (1)	0	0	0.5 (1)	0	0	2.1 (9)
Microsporidium sp. 01RB	5.56 (1)	1.57 (2)	0	0	0	0	0	0	0.9 (4)
Microsporidium sp. 02RB	0	0	0	0	0	0	0	0	0.2 (1)
Microsporidium sp. 03RB	0	0	0	0	0	0	0	0	0.2 (1)
Microsporidium sp. 505	22.2 (4)	3.15 (4)	0.7 (2)	3.85 (2)	1.41 (9)	0.5 (1)	0	0.83 (1)	2.1 (9)
Microsporidium sp. 515	0	7.87 (10)	1.8 (5)	9.61 (5)	2.04 (13)	1.6 (3)	4.88 (2)	1.67 (2)	1.86 (8)
Microsporidium sp. IV-B	0	0	0	9.61 (5)	23.82 (152)	6.4 (12)	0	0	0.9 (4)
Microsporidium sp. IV-F	0	0	0	0	0.78 (5)	0	2.44 (1)	0.83 (1)	0
Nosema granulosis	0	0	0.4 (1)	0	0.16 (1)	0	0	0.83 (1)	0

The number of infected individuals is reported in brackets.