Table 3.

Occurrence of freshwater snails in the woodland ponds studied

Species	Ponds
	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Viviparus contectus					✓
Potamopyrgus antipodarum			✓	✓	✓		✓	✓		✓	✓
Bithynia tentaculata		✓	✓	✓	✓
Valvata cristata	✓				✓						✓
Valvata piscinalis		✓	✓	✓		✓
Lymnaea stagnalis		✓	✓	✓	✓							✓	✓	✓
Stagnicola palustris		✓						✓		✓			✓
Stagnicola corvus			✓											✓
Galba truncatula	✓													✓
Radix auricularia		✓	✓	✓	✓								✓
Radix balthica	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓		✓
Planorbis planorbis	✓	✓		✓	✓		✓							✓
Anisus spirorbis					✓				✓	✓
Anisus vortex														✓
Bathyomphalus contortus												✓	✓
Gyraulus albus	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓		✓	✓	✓
Gyraulus crista	✓	✓			✓					✓		✓		✓
Hippeutis complanatus	✓	✓							✓			✓	✓	✓
Planorbarius corneus	✓	✓							✓	✓		✓	✓	✓
Ferrissia fragilis	✓								✓			✓	✓	✓
Physa fontinalis												✓
Physella acuta	✓	✓	✓	✓	✓	✓	✓
Aplexa hypnorum										✓
Number of species	10	12	9	9	12	4	5	4	6	8	3	13	8	11