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Related Experiment Video

Updated: Dec 23, 2025

Ecotoxicological Effects of Microplastics on Bird Embryo Development by Hatching without Eggshell
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Microplastics disrupt hermit crab shell selection.

Andrew Crump1, Charlotte Mullens1, Emily J Bethell2

  • 1Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, UK.

Biology Letters
|April 29, 2020
PubMed
Summary
This summary is machine-generated.

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Microplastic exposure impairs essential survival behaviors in hermit crabs. This plastic pollution negatively affects their cognition, specifically their ability to find and select optimal shells.

Area of Science:

  • Marine Biology
  • Environmental Science
  • Ecotoxicology

Background:

  • Microplastic pollution poses a significant threat to marine ecosystems and biodiversity.
  • The impact of microplastics on animal behavior and cognitive functions remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of microplastic exposure on the shell selection behavior and cognition of the common European hermit crab (Pagurus bernhardus).

Main Methods:

  • Hermit crabs were exposed to polyethylene microplastics for five days.
  • Post-exposure, their ability to contact, investigate, and enter an optimal shell was assessed and compared to a control group.

Main Results:

  • Microplastic-exposed hermit crabs demonstrated impaired shell selection, showing reduced likelihood and increased time to contact and enter optimal shells.
Keywords:
Pagurus bernhardusbehaviourcognitioncrustaceanplastic pollutionresource assessment

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  • Cognitive functions related to information processing were negatively affected, disrupting crucial survival behaviors.

    • Conclusions:

    • Microplastic exposure significantly disrupts essential survival behaviors in hermit crabs by impairing cognitive processes.
    • This study highlights the detrimental effects of microplastics on marine animal cognition and behavior.