Datafile to Sarabeev et al. Symbiotic species diversity can explain invasion success and host-parasite system stability: the case of gammarid hosts

Taxonomy and abundance data of symbiotic species from gammarid hosts in the Baltic region of Poland. Sample code (first 3-4 letters) defines host species and locality name, which is supplied with habitat abbreviations (3 letters after the hyphen) as follows: FWS, freshwater stream; FWR, freshwater river; FWD, freshwater delta; FWC, freshwater canal; BWD, brackish water delta; BWC, brackish water canal.