Fig. 1

AMR sampling sites. A: Position of Rothera Point on the Antarctic Peninsula; B: Closer detail of Adelaide Island including Rothera Point and the two furthest sampling sites, Hangar Cove and “Back Bay” Lagoon; C: Aerial photography image of the sampling sites at Rothera around the sewage treatment plant in North Cove. Background image is taken from the Rothera Minimum Snow Cover Survey 2019 aerial image, British Antarctic Survey. GIS co-ordinates available in Additional File 1