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Title: Toxicity of dispersant Corexit 9500A and crude oil to marine microzooplankton
Authors: Almeda, Rodrigo 
Hyatt, C
Buskey E.
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Crude oil
Corexit 9500A dispersant
Marine microzooplankton
Deepwater Horizon oil spill, et al
Issue Date: 2014
Journal: Ecotoxicology and Environmental Safety 
Abstract: In 2010, nearly 7 million liters of chemical dispersants, mainly Corexit® 9500A, were released in the Gulf of Mexico to treat the Deepwater Horizon oil spill. However, little is still known about the effects of Corexit 9500A and dispersed crude oil on microzooplankton despite the important roles of these planktonic organisms in marine ecosystems. We conducted laboratory experiments to determine the acute toxicity of Corexit 9500A, and physically and chemically dispersed Louisiana light sweet crude oil to marine microzooplankton (oligotrich ciliates, tintinnids and heterotrophic dinoflagellates). Our results indicate that Corexit 9500A is highly toxic to microzooplankton, particularly to small ciliates, and that the combination of dispersant with crude oil significantly increases the toxicity of crude oil to microzooplankton. The negative impact of crude oil and dispersant on microzooplankton may disrupt the transfer of energy from lower to higher trophic levels and change the structure and dynamics of marine planktonic communities.
ISSN: 0147-6513
DOI: 10.1016/j.ecoenv.2014.04.028
Source: Ecotoxicology and Environmental Safety [ISSN 0147-6513], v. 106, p.76-85 (August 2014)
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