Table 4.

Overview of comparable snail-trematode diversity and community studies.

No. of snail species	No. of snails sampled	No. of. trematode species	Overall prevalence	Sampling sites	Reference
11	14000	18	n/a	Estuarine saltmarsh system in the U.S.	15
1	n/a	11	‘low’	Four lakes in New Zealand	74
5	13197	39	13.5%	Six lakes in Canada	40
1	10821	6 genera	8.8%	120 freshwater ponds in the U.S.	75
15	6403	29	4.9%	Pooled data from rivers, ponds and lakes in Germany	42
12	2802	26	33.9%	Two fishponds and one swamp in the Czech Republic	43
6	10581	25	46.5%	29 lakes in Poland	44
14	n/a	26	n/a	Seven lakes in Poland	76
6	5347	36	19.6%	Interconnected Ruhr lake system	Present study