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Colony complexity affects microplastic loads in Pocillopora corals.

Jessica Reichert1, Joshua S Madin1, Martina Pierdomenico2

  • 1Hawai'i Institute of Marine Biology, University of Hawai'i at Mānoa, Hawai'i, Kāne'ohe, USA.

Environmental Pollution (Barking, Essex : 1987)
|May 21, 2025
PubMed
Summary
This summary is machine-generated.

Coral structural complexity significantly influences microplastic (MP) accumulation in marine environments. Compact coral shapes trap more MPs, highlighting the need to consider reef structure in pollution risk assessments.

Keywords:
3D scanning and photogrammetryKāne‘ohe BayMP transportPocilloporacoral reefsmarine debrismicroplastic accumulationmicroplastic pollution

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Area of Science:

  • Marine Ecology
  • Environmental Science
  • Coral Reef Biology

Background:

  • Microplastic (MP) pollution is a pervasive threat to marine ecosystems.
  • Coral reefs, with their complex structures, can act as sinks for MPs.
  • The role of coral structural complexity in MP accumulation is not well understood.

Purpose of the Study:

  • To quantify and characterize MPs trapped by Pocillopora corals.
  • To compare MP distribution across coral compartments (surface, tissue, skeleton).
  • To assess the relationship between coral complexity metrics and MP loads.

Main Methods:

  • Sampling of Pocillopora sp. colonies from Kāne'ohe Bay, Hawai'i.
  • Extraction and characterization of MPs using microscopy and FTIR spectroscopy.
  • Assessment of coral complexity using photogrammetry and 3D scanning.

Main Results:

  • Microplastics were detected in Pocillopora corals at an average of 0.029 ± 0.079 particles per g.
  • The majority of MPs (61%) were found on the coral surface.
  • Compact, thick-branched coral morphologies exhibited higher MP accumulation.

Conclusions:

  • Coral structural complexity significantly influences microplastic deposition under natural conditions.
  • Higher MP accumulation in complex morphologies is linked to stagnant water and reduced turbulence.
  • Understanding coral morphology is crucial for assessing MP pollution risks to coral reefs.