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Ecotoxicological Effects of Microplastics on Bird Embryo Development by Hatching without Eggshell
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Microplastics impede larval urchin selective feeding.

Pui Lam Ng1, Seneca S Kinn-Gurzo2, Kit Yu Karen Chan3

  • 1Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.

The Science of the Total Environment
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

Microplastic exposure impairs sea urchin larval feeding behavior, lengthening stomach-filling time and reducing particle selection. These sub-lethal effects threaten marine invertebrate development and post-settlement success.

Keywords:
Particle capturePluteusPollutantsSelectivity

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Area of Science:

  • Marine Biology
  • Ecotoxicology
  • Developmental Biology

Background:

  • Microplastics pose a significant threat to marine life, particularly suspension feeders like invertebrate larvae.
  • Larval feeding is a complex process susceptible to disruption by microplastic ingestion, with impacts on various stages.
  • The specific feeding processes affected by microplastics in marine larvae remain poorly understood.

Purpose of the Study:

  • To investigate the impact of prior microplastic exposure on the feeding behavior of larval sea urchins (Heliocidaris crassispina).
  • To determine if microplastics alter particle selection and food handling efficiency in marine invertebrate larvae.

Main Methods:

  • Larval sea urchins were pre-exposed to either algae only (control) or algae with 10 μm polystyrene beads at two concentrations (1 or 1000 beads mL⁻¹).
  • Two experiments were conducted: a food handling experiment (measuring survival, growth, stomach filling/vacating time) and a particle selection experiment.
  • Larvae were exposed until 3 or 7 days post-fertilization.

Main Results:

  • Prior microplastic exposure significantly lengthened stomach filling time in larval sea urchins.
  • Microplastic exposure impaired the larvae's ability to selectively ingest algal cells over microplastics.
  • No significant changes were observed in larval survivorship or arm length.

Conclusions:

  • Sub-lethal impacts of microplastics on larval feeding, such as lengthened stomach filling time and impaired particle selection, can have severe consequences.
  • These feeding disruptions may threaten the overall in vivo success of marine invertebrate larvae, especially in food-limited environments.
  • Microplastic pollution poses a considerable risk to the post-settlement success of marine invertebrates.