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Classification of marine microdebris: A review and case study on fish from the Great Barrier Reef, Australia
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This review developed a classification system for marine microdebris (0.1 μm to <5 mm) covering synthetic, semi-synthetic, and naturally-derived items, and applied it in a case study on fish from the Great Barrier Reef to standardize identification and reporting of small marine debris.
Marine debris, and in particular plastic pollution, is ubiquitous throughout global marine environments. Here, we present a classification of marine microdebris (i.e. debris between 0.1 μm and <5 mm) tailored to represent synthetic, semi-synthetic and naturally-derived items. The specific aim of this classification is to introduce a level of consistency in the higher-level characterisation of marine microdebris, thereby improving the overall reporting on marine microdebris contamination. We first conducted an extensive literature review on the accumulation of ingested debris in fish to identify discrepancies in marine microdebris reporting as a basis for the new classification. The review reveals the diverse nature of ingested marine microdebris, including items that are non-plastic but often incorrectly reported on as microplastics. We then applied our classification to a case study on wild-caught juvenile coral trout, Plectropomus spp., from the Great Barrier Reef World Heritage Area, Australia. This first report on accumulation of ingested marine debris in commercial fish on the reef demonstrates a high frequency of occurrence and a prevalence of semi-synthetic and naturally-derived fibres. Based on our findings, we offer recommendations on potential improvements for the classification presented, ultimately contributing to a more realistic assessment of the ecological risks of marine microdebris.
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This study found microplastic contamination in coral reef fish larvae from the Great Barrier Reef, where larval fish are uniquely vulnerable because microplastics overlap in size with their natural zooplankton prey and are concentrated by the same oceanographic processes. Ingestion of microplastics by larvae could impair early development and recruitment to reef fish populations.
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