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Trophic transfer of microplastics from mysids to fish greatly exceeds direct ingestion from the water column

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Title: Trophic transfer of microplastics from mysids to fish greatly exceeds direct ingestion from the water column
Authors: Hasegawa, Takaaki Browse this author
Nakaoka, Masahiro Browse this author →KAKEN DB
Keywords: Crustacean
Trophic transfer
Plastic fragmentation
Prey-predator interaction
Neomysis spp.
Myoxocephalus brandti
Issue Date: 15-Mar-2021
Publisher: Elsevier
Journal Title: Environmental pollution
Volume: 273
Issue: 15
Start Page: 116468
Publisher DOI: 10.1016/j.envpol.2021.116468
Abstract: Predators ingest microplastics directly from the environment and indirectly via trophic transfer, yet studies have not investigated the contribution of each pathway to microplastic ingestion in fish. We assessed the relative importance of the two exposure routes using mysids (Neomysis spp.) and a benthic fish (Myoxocephalus brandti) as a model prey-predator system. We first exposed the mysids to fluorescent polyethylene beads (27-32 mu m) at concentrations of 200 and 2000 mu g/L. We then exposed the fish to water containing the same concentrations of polyethylene beads or to nine mysids pre-exposed to polyethylene beads. We quantified the size and overall mass of polyethylene beads in mysids and in fish to assess polyethylene beads fragmentation by the mysids. Mysids ingested 2-3 more polyethylene beads from water containing the higher concentration, and fish ingested 3-11 times more polyethylene beads via trophic transfer than from the water column. The percentage of fragmented particles was higher in mysids and in fish fed bead-exposed mysids, suggesting that the mysids can fragment polyethylene beads. Our experiments demonstrate that trophic transfer is a major route of microplastic ingestion by fish and that prey such as mysids can fragment microplastics. Small particles can translocate from the digestive system into tissues and exert adverse physiological effects. Trophic transfer of microplastics may therefore pose more serious threats to organisms at higher trophic levels. (C) 2021 Elsevier Ltd. All rights reserved.
Rights: ©2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 仲岡 雅裕

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