Microplastics in marine sediments near Rothera Research Station, Antarctica

Highlights: • The Antarctica environment is remote and pristine compared to other regions. • Microplastics were detected in marine sediments around Rothera Research Station. • Microplastic levels were comparable with those found in marine sediments worldwide. • A likely source was treated laundry grey water from the station sewage outfall. • Further microplastics research would inform Antarctic policy and management. - Abstract: Antarctica and surrounding waters are often considered pristine, but may be subject to local pollution from tourism, fishing and governmental research programme activities. In particular, the quantification of microplastic pollution within the Antarctic Treaty area (south of latitude 60°S) has received little attention. We examined microplastic particle concentrations in sediment samples from 20 locations up to 7 km from Rothera Research Station. The highest concentrations of microplastic (−1) were recorded in sediment collected near the station sewage treatment plant outfall. The concentrations were similar to levels recorded in shallow and deep sea marine sediments outside Antarctica. The detected microplastics had characteristics similar to those commonly produced by clothes washing. We recommend further research on microplastics around Antarctic stations to inform policy discussions and the development of appropriate management responses.