Figure 1

Location of sampling points in the study region. Background maps from “Map data: Google, TerraMetrics,Dane mapy ©2021 Google Polska. (https://www.google.pl/maps/place/Trzebiesz%C3%B3w/@51.9976784,22.3932616,28111m/data=!3m2!1e3!4b1!4m5!3m4!1s0x4721fbd1e8dac53f:0x77c729fd11bcd3f3!8m2!3d52.0122717!4d22.5207958), accessed 31 March 2020. The background maps were modified using Microsoft Office PowerPoint 2019.