Table 1.

Table showing the origin of the data and the parameters used for ecological niche models (ENMs) for all study species in the Baltic Sea and their maximum distribution range. The table shows the total number of occurrence records before filtering, information on the species' biology from the literature, and the environmental layers selected. DL, distance to land (km); MD, maximum depth (m); SIC, sea ice concentration (30 arc-min); SSS, sea- surface salinity (psu); SST, sea-surface temperature (°C) (5 arc-min). All layers are mean annual values, except MD.

Species	Total GBIF records distribution	GBIF records Baltic	Other records Baltic*	Origin	Salinity tolerance [psu]	Selected layers
						5 arc-min†(Bio-Oracle, Tyberghein et al., 2012)	30 arc-min (Aqua-Maps, Kaschner et al., 2010)
Fucus vesiculosus	11072	575	332	Marine	4–35	SSS	(SSS), SIC, DL, MD
Fucus radicans	1	1	249	Brackish	3–7	SSS	(SSS), SIC, DL, MD
Idotea balthica	173	94	765	Marine	3–35	SSS, SST	(SSS, SST), SIC, DL, MD
Idotea chelipes	518	44	376	Marine	3–35	SSS, SST	(SSS, SST), SIC, DL, MD
Idotea granulosa	1105	26	149	Marine	5–35	SSS, SST	(SSS, SST), SIC, DL, MD
Gasterosteus aculeatus	24891	1384	0	Fresh–Marine	0–34	SSS, SST	(SSS, SST), SIC, DL, MD

^*Data collected by S. Leidenberger, data from museum collections and literature.

^†Used in the present projection only; for the 2050 projection, 30 arc-min layers were used exclusively.