Fig. 1

Location of the study area in central Vistula, Poland (coordinates 52.13815° N, 21.18593° E). The map was created in Adobe Photoshop based on map from the Polish Waters website (https://wody.isok.gov.pl/imap_kzgw/?gpmap=gpPDF).

Location of the study area in central Vistula, Poland (coordinates 52.13815° N, 21.18593° E). The map was created in Adobe Photoshop based on map from the Polish Waters website (https://wody.isok.gov.pl/imap_kzgw/?gpmap=gpPDF).