Effects of plastic ingestion on blood chemistry, gene expression and body condition in wedge-tailed shearwaters (Ardenna pacifica)
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View abstract on PubMed
Summary
This summary is machine-generated.Plastic pollution impacts seabirds, with ingested plastic found in wedge-tailed shearwaters. Light-weight birds showed physiological stress responses, suggesting dehydration and increased energy demands.
Area Of Science
- Marine Biology
- Ecotoxicology
- Avian Ecology
Background
- Plastic pollution is a pervasive global threat to marine ecosystems and biodiversity.
- Seabirds, as apex predators, are particularly vulnerable to the impacts of plastic ingestion.
- Wedge-tailed shearwaters (Ardenna pacifica) on Maui, Hawai'i, were studied to assess plastic's sublethal effects.
Purpose Of The Study
- To investigate the sublethal physiological and molecular effects of ingested plastic on wedge-tailed shearwaters.
- To determine the relationship between plastic ingestion and indicators of health, such as body condition, blood chemistry, and gene expression.
- To understand the adaptive or stress responses in seabirds exposed to plastic pollution.
Main Methods
- Analysis of blood chemistry, including blood urea nitrogen (BUN), hematocrit, and potassium levels.
- Gene expression profiling to identify changes in metabolic, biosynthetic, and inflammatory pathways.
- Morphometric measurements and examination of regurgitated stomach contents to assess plastic presence and body condition.
Main Results
- Plastic was detected in 12 out of 28 wedge-tailed shearwaters.
- No significant direct relationships were found between ingested plastic load and body condition, gene expression, or blood analytes.
- Light-weight birds exhibited upregulated metabolic and inflammatory genes, with elevated hematocrit, BUN, and potassium, suggesting dehydration and increased energetic demand.
Conclusions
- Sublethal physiological stress, potentially linked to dehydration and increased energy expenditure, was observed in lighter-weight shearwaters, possibly exacerbated by plastic ingestion.
- While direct links between plastic load and measured health indicators were not significant, indirect physiological stress responses are evident.
- Further research with repetitive sampling is recommended to monitor body condition changes throughout the breeding season and to better understand the long-term effects of plastic ingestion in free-living seabird populations.
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