Chemoreception drives plastic consumption in a hard coral

Last modified: 
December 16, 2019 - 1:00pm
Type: Journal Article
Year of publication: 2017
Date published: 11/2017
Authors: Austin Allen, Alexander Seymour, Daniel Rittschof
Journal title: Marine Pollution Bulletin
Volume: 124
Issue: 1
Pages: 198 - 205
ISSN: 0025326X

The drivers behind microplastic (up to 5 mm in diameter) consumption by animals are uncertain and impacts on foundational species are poorly understood. We investigated consumption of weathered, unfouled, biofouled, pre-production and microbe-free National Institute of Standards plastic by a scleractinian coral that relies on chemosensory cues for feeding. Experiment one found that corals ingested many plastic types while mostly ignoring organic-free sand, suggesting that plastic contains phagostimulents. Experiment two found that corals ingested more plastic that wasn't covered in a microbial biofilm than plastics that were biofilmed. Additionally, corals retained ~ 8% of ingested plastic for 24 h or more and retained particles appeared stuck in corals, with consequences for energetics, pollutant toxicity and trophic transfer. The potential for chemoreception to drive plastic consumption in marine taxa has implications for conservation.

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