Table 1.

List of alien (AS) and indigenous (IS) species, including abbreviations, of the four different taxonomical groups, amphipoda (AMP), isopoda (ISO), gastropods (GAS), and bivalves (BIV), which were considered in the species-specific analysis. Just species with at least five sites of occurrence were considered

AS/IS	Group	Species	Abbreviations
AS	AMP	Corophium curvispinum	C.cur
AS	AMP	Dikerogammarus villosus	D.vil
AS	AMP	Echinogammarus berilloni	E.ber
AS	AMP	Gammarus tigrinus	G.tig
AS	BIV	Corbicula fluminea	C.flu
AS	BIV	Dreissena polymorpha	D.pol
AS	GAS	Physella acuta	P.acu
AS	GAS	Physella heterostropha	P.het
AS	GAS	Potamopyrgus antipodarum	P.ant
AS	ISO	Jaera istri	J.ist.
AS	ISO	Proasellus coxalis	P.cox
IS	AMP	Gammarus fossarum	G.fos
IS	AMP	Gammarus pulex	G.pul
IS	AMP	Gammarus roeselii	G.roe
IS	BIV	Anodonta anatina	A.ana
IS	BIV	Musculium lacustre	M.lac
IS	BIV	Pisidium amnicum	P.amn
IS	BIV	Pisidium casertanum	P.cas
IS	BIV	Pisidium henslowanum	P.hen
IS	BIV	Pisidium milium	P.mil
IS	BIV	Pisidium nitidum	P.nit
IS	BIV	Pisidium personatum	P.per
IS	BIV	Pisidium subtruncatum	P.sub
IS	BIV	Pisidium supinum	P.sup
IS	BIV	Sphaerium corneum	S.cor
IS	BIV	Sphaerium rivicola	S.riv
IS	BIV	Unio pictorum	U.pic
IS	BIV	Unio tumidus	U.tum
IS	GAS	Acroloxus lacustris	A.lac
IS	GAS	Ancylus fluviatilis	A.flu
IS	GAS	Anisus vortex	A.vor
IS	GAS	Bathyomphalus contortus	B.con
IS	GAS	Bithynia tentaculata	B.ten
IS	GAS	Galba truncatula	G.tru
IS	GAS	Gyraulus albus	G.alb
IS	GAS	Lymnaea stagnalis	L.sta
IS	GAS	Physa fontinalis	P.fon
IS	GAS	Planorbarius corneus	P.cor
IS	GAS	Planorbis carinatus	P.car
IS	GAS	Planorbis planorbis	P.pla
IS	GAS	Radix auricularia	R.aur
IS	GAS	Radix balthica	R.bal
IS	GAS	Radix labiata	R.lab
IS	GAS	Theodoxus fluviatilis	T.flu
IS	GAS	Valvata cristata	V.cri
IS	GAS	Valvata piscinalis	V.pis
IS	GAS	Viviparus contectus	V.con
IS	GAS	Viviparus viviparus	V.viv
IS	ISO	Asellus aquaticus	A.aqu