alexa Effects of Macondo Oil on Phytoplankton from Grand Isle, Louisiana
ISSN: 2161-0525

Journal of Environmental & Analytical Toxicology
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Research Article

Effects of Macondo Oil on Phytoplankton from Grand Isle, Louisiana

Jie Li1, Robert R Bidigare2 and Edward A Laws1*

1Department of Environmental Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA

2Hawaii Institute of Marine Biology, University of Hawaii, PO Box 1346, Kaneohe, HI 96744, USA

*Corresponding Author:
Edward A Laws
Department of Environmental Sciences
College of the Coast and Environment
Louisiana State University, Baton Rouge
LA 70803, USA
Tel: 12255788800
E-mail: [email protected]

Received Date: May 04, 2017 Accepted Date: May 08, 2017 Published Date: May 13, 2017

Citation: Li J, Bidigare RR, Laws EA (2017) Effects of Macondo Oil on Phytoplankton from Grand Isle, Louisiana. J Environ Anal Toxicol 7: 468. doi: 10.4172/2161- 0525.1000468

Copyright: © 2017 Li J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Bioassays were performed on phytoplankton communities from the coastal waters at Grand Isle, Louisiana from February through August 2013 to determine the impact of the water-accommodated fraction of unweathered Macondo well oil on the growth rates and taxonomic composition of the phytoplankton. Pigment analysis indicated that diatoms dominated the natural phytoplankton communities, and with one exception, diatoms were the only class of phytoplankton that grew in control cultures or in artificial seawater amended with the water-accommodated fractions of Macondo well oil at a series of concentrations from 0.1 to 19.2 mg L–1. The growth rates of diatoms were enhanced by roughly 10% at oil concentrations ≤ 0.6 mg L–1 but were reduced by up to 30% at concentrations ≥ 1.0 mg L–1. Ratios of fucoxanthin to chlorophyll a were positively correlated with oil concentrations, an indication that there was some adjustment of the characteristics of the light-harvesting antennae of the diatoms in response to the stress of the oil.

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