Cited by 286Microplastics and Plastic PollutionEnvironmental Toxicology and EcotoxicologyMarine Biology and Ecology Research

Fate of Microplastics in the Marine Isopod Idotea emarginata

Hämer, Julia, Gutow, Lars, Köhler, Angela, Saborowski, Reinhard·2014·Environmental Science & Technology

Abstract

Plastic pollution is an emerging global threat for marine wildlife. Many species of birds, reptiles, and fishes are directly impaired by plastics as they can get entangled in ropes and drown or they can ingest plastic fragments which, in turn, may clog their stomachs and guts. Microplastics of less than 1 mm can be ingested by small invertebrates, but their fate in the digestive organs and their effects on the animals are yet not well understood. We embedded fluorescent microplastics in artificial agarose-based food and offered the food to marine isopods, Idotea emarginata. The isopods did not distinguish between food with and food without microplastics. Upon ingestion, the microplastics were present in the stomach and in the gut but not in the tubules of the midgut gland which is the principal organ of enzyme-secretion and nutrient resorption. The feces contained the same concentration of microplastics as the food which indicates that no accumulation of microplastics happens during the gut passage. Long-term bioassays of 6 weeks showed no distinct effects of continuous microplastic consumption on mortality, growth, and intermolt duration. I. emarginata are able to prevent intrusion of particles even smaller than 1 μm into the midgut gland which is facilitated by the complex structure of the stomach including a fine filter system. It separates the midgut gland tubules from the stomach and allows only the passage of fluids and chyme. Our results indicate that microplastics, as administered in the experiments, do not clog the digestive organs of isopods and do not have adverse effects on their life history parameters.

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Crossref · 10.1021/es501385y

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  • Microplastic uptake had no effect on the marine isopod Idotea emarginata, but it caused weight loss and lower feeding activity in the marine lugworm Arenicola marina.

    “Microplastic uptake did not cause any effects on the marine isopod Idotea emarginata(16) but did cause weight loss and a reduced feeding activity for the marine lugworm Arenicola marina.17−19”

    From Microplastic Effect Thresholds for Freshwater Benthic Macroinvertebrates (2018) · cites this paper as [16]

    The Discussion (p. 4) reports no distinct adverse effects on the isopods’ survival, intermolt duration, or growth. But the Discussion (p. 6) also reports reduced uptake of food supplemented with microplastics, so “did not cause any effects” is too absolute. The lugworm finding is attached to citations 17–19, not this source. (LLM, conf=0.86)

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  • No growth effects were found for the marine isopod I. emarginata exposed to PE, PS, and PA microplastics in water.

    “No effects were found on growth for the marine isopod I. emarginata exposed to PE, PS, and PA microplastics in water,16”

    From Microplastic Effect Thresholds for Freshwater Benthic Macroinvertebrates (2018) · cites this paper as [16]

    The Discussion (p. 4) reports no distinct adverse effect on growth, and the Materials and Methods (p. 2) describe food containing PE fragments; the Introduction (p. 2) identifies PS particles and polyacrylic fibers. But the isopods ingested microplastics embedded in artificial food, rather than being exposed to microplastics dispersed in water. (LLM, conf=0.90)

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Research works printed but not linked: 3

  1. [28](28) Thompson, R. C. Plastic debris in the marine environment: consequences and solutions. Marine Nature Conservation in Europe 2006. Proceedings of the Symposium , Stralsund, BfN Skripten, 2007; Vol. 193 , pp 107 -116. http://www.habitatmarenatura2000.de (accessed Sept 30, 2014). -
  2. [29](29) Fauchald, K.; Jumars, P. A. The diet of worms: a study of polychaete feeding guilds. Oceanogr. Mar. Biol. Annu. Rev. 1979 , 17 , 193 -284. -
  3. [52](52) Graham, E. R.; Thompson, J. T. Depositand suspensionfeeding sea cucumbers (Echinodermata) ingest plastic fragments. J. Exp. Mar. Biol. Ecol. 2009 , 368 (1), 22 -29 DOI: 10.1016/ j.jembe.2008.09.007. -

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Authors
Hämer, J., Gutow, L., Köhler, A., & Saborowski, R.
Affiliations
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (DE)
Corresponding author
Saborowski, Reinhard
Venue
Environmental Science & Technology
Published
2014-11-06
Volume
48
Issue
22
Pages
13451-13458
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2321250239
Cited by
286
References
69
Citations by year
2026: 5 · 2025: 21 · 2024: 22 · 2023: 30 · 2022: 30 · 2021: 31 · 2020: 38 · 2019: 33 · 2018: 24 · 2017: 22 · 2016: 22 · 2015: 8
FWCI
12.23
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
  • Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut) (acceptedVersion)
Topics
  • Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Biology and Ecology Research
Keywords
microplastics, marine isopods, plastic ingestion, hepatopancreas, gastrointestinal tract, fecal excretion, plastic pollution, life history, mortality, growth
MeSH terms
Animals, Digestive System, Feces, Gastrointestinal Contents, Plastics, Water Pollutants, Chemical, Isopoda

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