Abstract
While whole sediment toxicity tests with macrofaunal polychaetes are well developed and standardized, they are oftentimes not very sensitive to environmental contaminants. Meiofaunal polychaetes, however, are sensitive to contaminants, easy to culture, and representative of the interstitial habitat. These are desirable attributes for ecotoxicological assessments of marine and estuarine sediments. The meiofaunal polychaete, Dinophilus gyrociliatus Schmidt, 1857, is a cosmopolitan species that has become a useful tool for ecotoxicological assessments, particularly for its use in toxicity testing with sediment pore waters. Due to its short life cycle it is suitable for sublethal toxicity tests, with egg production by the females as a sensitive endpoint, which can be assessed in a 7-day exposure period. Toxicity assessments of pore waters from an industrialized bay in Texas, U.S.A., and of pore waters from sediments spiked with nitroaromatic explosives, demonstrated that the D. gyrociliatus reproduction endpoint was consistently among the most sensitive, when compared to early-life stage tests with several other marine species, including macro-algae, sea urchins and fish. There was also excellent agreement among the results of porewater tests with D. gyrociliatus, nauplii of the meiofaunal copepod, Longipedia americana, and embryos of the sea urchin, Arbacia punctulata in a survey with pore waters extracted from sediments collected in the vicinity of an oil platform in the Gulf of Mexico, where metals were the primary contaminants of concern.
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Nipper, M., Carr, R.S. (2003). Recent advances in the use of meiofaunal polychaetes for ecotoxicological assessments. In: Sigvaldadóttir, E., et al. Advances in Polychaete Research. Developments in Hydrobiology, vol 170. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0655-1_33
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DOI: https://doi.org/10.1007/978-94-017-0655-1_33
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