Seabirds in crisis: Plastic ingestion induces proteomic signatures of multiorgan failure and neurodegeneration.
Level 5 - mechanism / opinion, no new human data
Non-human animal study
PubMed 40073124 · doi:10.1126/sciadv.ads0834
What was done
Researchers applied a hypothesis-agnostic proteomic approach to measure changes in 745 proteins in blood samples from free-living seabird chicks (<90 days old) with differing levels of natural plastic ingestion exposure.
What was found
The abstract reports no numerical values or statistical effect sizes. Chicks with heavy plastic ingestion showed elevated intracellular components in blood (indicating cell lysis), reduced abundance of secreted proteins (indicating stomach, liver, and kidney dysfunction), and proteomic signatures of neurodegeneration. Traditional wildlife metrics such as body mass did not reflect these internal health impacts.
Why it matters
It demonstrates that plastic ingestion causes systemic, distal toxicological impacts—including multiorgan dysfunction and potential neurotoxicity—that are missed by standard gross health metrics like body weight.
Limits
The abstract does not disclose the sample size (n), the specific seabird species, exact plastic exposure doses, or numerical effect sizes with confidence intervals. As an observational study of wild animals, unmeasured confounding from other environmental contaminants or dietary differences cannot be ruled out.
Cited by
- supports Young birds that had ingested plastic exhibited a dementia-like molecular signature compared to control birds, with BDNF levels reduced by approximately half.
- context Histological examinations of shearwater birds that ingested plastic revealed widespread organ fibrosis in the liver, kidneys, and stomach, a pathology termed 'plasticosis'.