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Species-specific impact of microplastics on coral physiology

Mendrik, F.M.; Henry, T.B.; Burdett, H.; Hackney, C.R.; Waller, C.; Parsons, D.R.; Hennige, S.J.


F.M. Mendrik

T.B. Henry

H. Burdett

C.R. Hackney

D.R. Parsons

S.J. Hennige


There is evidence that microplastic (MP) pollution can negatively influence coral health; however, mechanisms are unknown and most studies have used MP exposure concentrations that are considerably higher than current environmental conditions. Furthermore, whether MP exposure influences coral susceptibility to other stressors such as ocean warming is unknown. Our objective was to determine the physiology response of corals exposed to MP concentrations that have been observed in-situ at ambient and elevated temperature that replicates ocean warming. Here, two sets of short-term experiments were conducted at ambient and elevated temperature, exposing the corals Acropora sp. and Seriatopora hystrix to microspheres and microfibres. Throughout the experiments, gross photosynthesis and net respiration was quantified using a 4-chamber coral respirometer, and photosynthetic yields of photosystem II were measured using Pulse-Amplitude Modulated (PAM) fluorometry. Results indicate the effect of MP exposure is dependent on MP type, coral species, and temperature. MP fibres (but not spheres) reduced photosynthetic capability of Acropora sp., with a 41% decrease in photochemical efficiency at ambient temperature over 12 days. No additional stress response was observed at elevated temperature; photosynthetic performance significantly increased in Seriatopora hystrix exposed to MP spheres. These findings show that a disruption to coral photosynthetic ability can occur at MP concentrations that have been observed in the marine environment and that MP pollution impact on corals remains an important aspect for further research.


Mendrik, F., Henry, T., Burdett, H., Hackney, C., Waller, C., Parsons, D., & Hennige, S. (2021). Species-specific impact of microplastics on coral physiology. Environmental pollution, 269, Article 116238.

Journal Article Type Article
Acceptance Date Dec 4, 2020
Online Publication Date Dec 7, 2020
Publication Date Jan 15, 2021
Deposit Date Feb 5, 2021
Publicly Available Date Dec 8, 2021
Journal Environmental Pollution
Print ISSN 0269-7491
Electronic ISSN 1873-6424
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 269
Article Number 116238
Keywords Microplastic; Reef-building corals; Ocean warming; Photosynthesis; Stress; Respiration
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