期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 52, 期 10, 页码 5718-5724出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b00335
关键词
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资金
- NSF [1129659]
- Gulf of Mexico Research Initiative
- DFF-Individual postdoctoral grant from the Danish Council for Independent Research [17023]
- European Union [6240979]
- Technical University of Denmark
- Villum Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1129659] Funding Source: National Science Foundation
After oil spills and dispersant applications the formation of red tides or harmful algal blooms (HABs) has been observed, which can cause additional negative impacts in areas affected by oil spills. However, the link between oil spills and HABs is still unknown. Here, we present experimental evidence that demonstrates a connection between oil spills and HABs. We determined the effects of oil, dispersant-treated oil, and dispersant alone on the structure of natural plankton assemblages in the Northern Gulf of Mexico. In coastal waters, large tintinnids and oligotrich ciliates, major grazers of phytoplankton, were negatively affected by the exposure to oil and dispersant, whereas bloom-forming dinoflagellates (Prorocentrum texanum, P. triestinum, and Scrippsiella trochoidea) notably increased their concentration. The removal of key grazers due to oil and dispersant disrupts the predator prey controls (top-down controls) that normally function in plankton food webs. This disruption of grazing pressure opens a loophole that allows certain dinoflagellates with higher tolerance to oil and dispersants than their grazers to grow and form blooms when there are no growth limiting factors (e.g., nutrients). Therefore, oil spills and dispersants can act as disrupters of predator prey controls in plankton food webs and as indirect inducers of potentially harmful dinoflagellate blooms.
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