PMID- 34872166 OWN - NLM STAT- MEDLINE DCOM- 20211208 LR - 20211214 IS - 1879-3363 (Electronic) IS - 0025-326X (Linking) VI - 173 IP - Pt A DP - 2021 Dec TI - Buoyancy affects stranding rate and dispersal distance of floating litter entering the sea from river mouths. PG - 113028 LID - S0025-326X(21)01062-6 [pii] LID - 10.1016/j.marpolbul.2021.113028 [doi] AB - Rivers are a major source of litter entering the sea but our understanding of the transport and fate of plastics in estuarine environments is poor. Marked blocks of varying buoyancy were released at three river mouths in South Africa. Of the 1400 blocks released, 80% were recovered on nearby beaches, with a higher recovery rate for more buoyant blocks. Dispersal distances increased with decreasing buoyancy at all sites; median dispersal distance of stranded items ranged from 20 to 90 m for expanded polystyrene (EPS) to 70-90 m for wood and 60-1042 m for high density polyethylene (HDPE) blocks. Floating litter in estuaries is subject to bidirectional flow and export is largely controlled by hydrodynamic conditions such as tides, winds, and wave action, as well as coastal structure and vegetation. Cleaning beaches around river mouths will help to reduce leakage of plastic and other litter into the sea. CI - Copyright (c) 2021 Elsevier Ltd. All rights reserved. FAU - Maclean, Kyle AU - Maclean K AD - FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa. Electronic address: macleankyle1@gmail.com. FAU - Weideman, Eleanor A AU - Weideman EA AD - FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa. FAU - Perold, Vonica AU - Perold V AD - FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa. FAU - Ryan, Peter G AU - Ryan PG AD - FitzPatrick Institute of African Ornithology, DSI-NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa. LA - eng PT - Journal Article DEP - 20211013 PL - England TA - Mar Pollut Bull JT - Marine pollution bulletin JID - 0260231 RN - 0 (Plastics) RN - 0 (Polystyrenes) RN - 0 (Waste Products) SB - IM MH - Environmental Monitoring MH - Plastics MH - Polystyrenes MH - *Rivers MH - *Waste Products/analysis OTO - NOTNLM OT - Buoyancy OT - Land-based sources OT - Macroplastics OT - Plastic tracking EDAT- 2021/12/08 06:00 MHDA- 2021/12/15 06:00 CRDT- 2021/12/07 01:02 PHST- 2021/06/10 00:00 [received] PHST- 2021/09/29 00:00 [revised] PHST- 2021/09/30 00:00 [accepted] PHST- 2021/12/07 01:02 [entrez] PHST- 2021/12/08 06:00 [pubmed] PHST- 2021/12/15 06:00 [medline] AID - S0025-326X(21)01062-6 [pii] AID - 10.1016/j.marpolbul.2021.113028 [doi] PST - ppublish SO - Mar Pollut Bull. 2021 Dec;173(Pt A):113028. doi: 10.1016/j.marpolbul.2021.113028. Epub 2021 Oct 13.