Surface oil is the primary driver of macroinvertebrate impacts following spills of diluted bitumen in freshwater
| Autor: | Vince Palace, Bruce P. Hollebone, Mark L. Hanson, Diane M. Orihel, Tyler A. Black, Jules M. Blais, M.S. White, Jose Luis Rodriguez-Gil |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Health Toxicology and Mutagenesis 010501 environmental sciences Toxicology 01 natural sciences Animals 14. Life underwater Ecosystem 0105 earth and related environmental sciences Invertebrate 010604 marine biology & hydrobiology Dilbit Lake ecosystem Community structure Sediment General Medicine Pollution Invertebrates 6. Clean water Hydrocarbons Lakes Asphalt Benthic zone Environmental chemistry Environmental science Species richness Oils Water Pollutants Chemical |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 290 |
| ISSN: | 1873-6424 |
| Popis: | The response of freshwater invertebrates following accidental releases of oil is not well understood. This knowledge gap is more substantial for unconventional oils such as diluted bitumen (dilbit). We evaluated the effects of dilbit on insect emergence and benthic invertebrates by conducting experimental spills in limnocorrals (10-m diameter; ~100-m3) deployed in a boreal lake at the IISD-Experimental Lakes Area, Canada. The study included seven dilbit treatments (spill volumes ranged from 1.5 L [1:66,000, oil:water, v/v] to 180 L [1:590, oil:water, v/v]), two controls, and additional lake reference sites, monitored for 11 weeks. Invertebrate emergence declined at the community level following oil addition in a significantly volume-dependent manner, and by 93–100 % over the 11 weeks following the spill in the highest treatment. Dilbit altered community structure of benthic invertebrates, but not abundance. One-year post-spill and following oil removal using traditional skimming and absorption techniques, benthic richness and abundance were greater among all treatments than the previous year. These results indicate that recovery in community composition is possible following oil removal from a lake ecosystem. Research is needed concerning the mechanisms by which surface oil directly affect adult invertebrates, whether through limiting oviposition, limiting emergence, or both. The response of benthic communities to sediment tar mats is also warranted. |
| Databáze: | OpenAIRE |
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