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Published on: March 6, 2018
Polystyrene microplastic exposure reduces fecundity and delays development of the nematode Litoditis marina despite
Flávia J L de França1, Louka Noyen2, Rodgee Mae Guden2
1Department of Zoology, Federal University of Pernambuco, Recife, Pernambuco, Brazil.
Abstract:
Microplastics (MPs) pose a significant threat to marine benthic ecosystems. Using cryptic species PmIII of the marine nematode species complex of Litoditis marina as a model organism, we investigated the ingestion of differently sized polystyrene MPs (1- and 6-μm), their impact on carbon absorption from 13C-labeled bacteria, and the subsequent consequences for key life-history traits and population dynamics. Consistent with its buccal cavity size, Litoditis marina readily ingested 1-μm MPs, both in the presence and absence of a food source, but did not ingest the larger 6-μm particles. Crucially, short-term carbon absorption from bacteria remained unaffected by either MP size, even when the nematode gut was heavily loaded with 1-μm MPs. Despite this lack of nutritional impact, chronic exposure to 1-μm MPs significantly reduced fecundity, delayed embryonic and total development times, and decreased the abundance of eggs, juveniles, and adults, thereby compromising overall population maintenance. This disparity suggests that the adverse population-level effects are not driven by reduced nutrient uptake but likely by alternative mechanisms, such as increased energetic costs or direct reproductive stress. Our findings underscore the necessity of long-term, multiparameter mechanistic studies conducted at environmentally relevant pollutant concentrations to fully assess the ecological risks posed by microplastic pollution.
Insights
Marine nematodes readily ingest small microplastics (MPs), but these particles do not affect nutrient absorption. Chronic exposure to MPs significantly harms nematode reproduction and population dynamics, indicating non-nutritional stress mechanisms.
Area of Science:
- Marine Biology
- Ecotoxicology
- Environmental Science
Background:
- Microplastics (MPs) are pervasive pollutants in marine ecosystems.
- Benthic invertebrates, like nematodes, are susceptible to microplastic ingestion.
- Understanding the ecological impact of MPs on marine life is crucial.
Purpose of the Study:
- Investigate the ingestion of polystyrene MPs by the marine nematode Litoditis marina.
- Assess the impact of MPs on carbon absorption from labeled bacteria.
- Determine the effects of MPs on nematode life-history traits and population dynamics.
Main Methods:
- Utilized cryptic species PmIII of Litoditis marina as a model organism.
- Exposed nematodes to 1-μm and 6-μm polystyrene MPs.
- Measured carbon absorption from 13C-labeled bacteria.
- Monitored key life-history traits (fecundity, development time) and population abundance.
Main Results:
- Litoditis marina ingested 1-μm MPs but not 6-μm MPs.
- Short-term carbon absorption remained unaffected by MP ingestion.
- Chronic exposure to 1-μm MPs significantly reduced fecundity and development time.
- Nematode population abundance (eggs, juveniles, adults) decreased with MP exposure.
Conclusions:
- Adverse population-level effects of MPs are likely due to non-nutritional mechanisms like increased energetic costs or reproductive stress.
- Microplastic ingestion does not impair short-term nutrient uptake in this nematode model.
- Long-term studies are essential to fully evaluate the ecological risks of microplastic pollution.
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