Abstract
To better understand the potential impacts of the deepwater horizon oil spill on lower trophic level food sources, a series of toxicological laboratory experiments were conducted with two microalgae species. The acute toxicity of oil (tar mat and MC252 crude oil), dispersant (Corexit 9500A), and dispersed oil on growth inhibition (IC50) and motility of Isochrysis galbana and Chaetoceros sp. were determined. There was no impact on cell division (growth) for microalgae exposed to both oil types and mean motility of I. galbana never dropped below 79 %. However, the addition of dispersant inhibited cell division and motility within 24 h, with Chaetoceros sp. being more susceptible to sublethal effects than I. galbana. These results highlight microalgae sensitivity to the use of dispersants in bioremediation processes, which may be a concern for long-term impacts on fisheries recruitment.
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Acknowledgments
This research was made possible by a grant from BP/The Gulf of Mexico Research Initiative through the Florida Institute of Oceanography. The authors would like to thank the Florida Fish and Wildlife Conservation Commission, BP, and Nalco for providing the tar mat oil, crude oil, and Corexit used in our studies. This is contribution #1933 of the Harbor Branch Oceanographic Institute at Florida Atlantic University.
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Garr, A.L., Laramore, S. & Krebs, W. Toxic Effects of Oil and Dispersant on Marine Microalgae. Bull Environ Contam Toxicol 93, 654–659 (2014). https://doi.org/10.1007/s00128-014-1395-2
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DOI: https://doi.org/10.1007/s00128-014-1395-2