Effects of carbon dioxide on deep-sea harpacticoids revisited |
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| Authors: | Linda Sedlacek David Thistle Kevin R Carman John W Fleeger James P Barry |
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| Institution: | 1. Department of Oceanography, Florida State University, Tallahassee, FL 32306-4320, USA;2. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803-1725, USA;3. Monterey Bay Aquarium Research Institute, Sandholdt Road, Moss Landing, CA 95039-9644, USA |
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| Abstract: | As part of the evaluation of the environmental impact of sequestering carbon dioxide in the deep ocean, we exposed the sediment-dwelling fauna at a station in Monterey Submarine Canyon (36.378°N, 122.676°W, 3262 m) to carbon dioxide-rich seawater and found that most of the harpacticoid copepods were killed. In an expanded, follow-on experiment on the continental rise nearby (36.709°N, 123.523°W, 3607 m), not only did harpacticoids survive exposure to carbon dioxide-rich seawater, but we found no evidence from seven additional metrics that the harpacticoids had been affected. We infer that during the second experiment the harpacticoids were not exposed to a stressful dose. During the second experiment, carbon dioxide-rich seawater appears to have been produced more slowly than in the first, probably because of differences in the near-bottom flow regimes. We conclude that local physical circumstances can substantially influence the results of experiments of this type and will complicate the evaluation of the environmental consequences of deep-ocean carbon dioxide sequestration. |
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