Table 2 Parasites and pathogens associated with Gammarus roeselii (n = 156) during this study. The prevalence of each pathogen and parasite in the population sampled from Chojna, Poland, is stated alongside the reference image, if available

Viruses

Gammarus roeselii Bacilliform Virus

12.2

Fig. 2

Putative gut virus

2.7

Fig. 1f

Bacteria

Epibiotic filamentous bacteria

100

Fig. 1b

Putative rickettsia-like organism

< 1.0

Fig. 1g

Microsporidia

Cucumispora roeselii n. sp.

12.2

Figs. 3–5

Microsporidium sp. from the hepatopancreas

< 1.0

Fig. 1j

Protists

Epibiotic, stalked, ciliated protists

83.9

Fig. 1a, b

Epibiotic embedded ciliated protists

83.9

Fig. 1c

Parasitic ciliated protists

< 1.0

Fig. 1d

Gut-dwelling gregarines

50.0

Fig. 1e

Metazoa

Epibiotic rotifer

48.6

Fig. 1a

Digenean trematodes

1.4

Fig. 1h 

Polymorphus minutus

1.4

Fig. 1i

Pomphorhynchus sp.

4.1

No image