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Piers are hotspots for benthic marine debris in an urbanised estuary. | LitMetric

Piers are hotspots for benthic marine debris in an urbanised estuary.

PLoS One

Evolution & Ecology Research Centre, University of New South Wales, Sydney, New South Wales, Australia.

Published: December 2022

AI Article Synopsis

  • A study in Sydney Harbour examined the impact of recreational activities on marine debris, finding that piers had significantly higher debris levels than nearby soft-sediment habitats.
  • Over 2,800 debris items were collected, with more than half being plastic and a large portion linked to recreational fishing, especially near the estuary mouth.
  • The research suggests that management efforts should concentrate on areas near piers and that public awareness campaigns should address the behaviors of recreational users to reduce debris.

Article Abstract

Records of anthropogenic marine debris and the threats it poses are increasing worldwide, yet we know relatively little about the distribution of benthic debris. The seafloor is the final destination for a large proportion of debris due to the degradation and sinking of items. A more detailed understanding of debris distributions in hotspots such as urbanised estuaries can help decision makers target management and remediation activities. We selected sites frequented by fishers and boaters in Sydney Harbour, an urbanised estuary, to investigate the impacts of recreational activities on debris abundance. The aim of this study was to examine variation in macro debris (>5mm in diameter) type and abundance at two habitat types (piers and non-piers). We chose five locations at various distances from the estuary mouth. In each location SCUBA teams performed fixed transects at two sites, one under a pier and one over nearby soft-sediment habitat. Debris was recovered by the divers and brought to the surface for classification and disposal. Surveys were repeated multiple times at each location between November 2019 and February 2020, recording a total of 2803 debris items over 36 survey events. Overall, piers had more than ten times the debris abundance of soft-sediment sites, and much higher proportion of debris types related to recreational fishing. Over half of the debris items in this study were plastic (65%), and approximately 70% of the total debris was classified as related to recreational fishing. This trait was most prominent in debris at sites closest to the estuary mouth, likely reflecting increased fishing activity in this area. This study indicates that policy makers and community groups in urbanised estuaries should focus monitoring, reduction, and remediation efforts near artificial structures such as piers, and that public awareness campaigns should target the behaviour of recreational users of these structures.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9797093PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0274512PLOS

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