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Related Experiment Video

Updated: Jan 17, 2026

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Tissue-specific microplastic burden in cetacean non-digestive organs.

Kexin Song1, Yuhuan Zhai1, Hui Kang2

  • 1Analytical Instrumentation Center, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Marine Mammal and Marine Bioacoustics Laboratory, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China.

Environmental Research
|September 20, 2025
PubMed
Summary

Microplastic (MP) pollution is widespread in marine mammals, accumulating in over 75% of non-digestive tissues in cetaceans. Tissue type significantly impacts MP characteristics more than species, highlighting the need for multi-tissue analysis.

Keywords:
DolphinMicroplasticTarget organTissue distributionWhale

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Area of Science:

  • Marine Biology
  • Environmental Science
  • Toxicology

Background:

  • Marine mammals, particularly cetaceans, face increasing threats from microplastic (MP) pollution.
  • Understanding MP accumulation in non-digestive tissues is crucial for assessing health impacts and developing mitigation strategies.
  • Significant research gaps exist regarding MP pollution characteristics and influencing factors across multiple cetacean tissues.

Purpose of the Study:

  • To investigate microplastic pollution in the non-digestive tissues of nearshore (Neophocaena phocaenoides) and offshore (Peponocephala electra) cetaceans.
  • To analyze the characteristics of MPs and identify influencing factors on their accumulation.
  • To compare MP pollution patterns between different species and tissues.

Main Methods:

  • Sample collection from non-digestive tissues of two cetacean species.
  • Microplastic identification and characterization.
  • Statistical analysis including dose-response modeling, Simpson index, and clustering analysis.

Main Results:

  • Microplastics were detected in over 75% of non-digestive tissues across both species, indicating widespread pollution.
  • Tissue-specific diversity of MPs (0.32) was higher than species-specific diversity (0.01), suggesting tissue function influences MP characteristics.
  • Clustering analysis revealed similarities in MP characteristics between tissues with similar physiological functions (e.g., heart and liver).

Conclusions:

  • Non-digestive tissues in cetaceans exhibit significant microplastic accumulation, necessitating multi-tissue investigations for accurate pollution assessment.
  • Tissue type is a more significant factor than species in determining microplastic characteristics within cetaceans.
  • Pollution source control may be more effective for reducing microplastic loads in nearshore cetaceans compared to offshore populations.