Isolation and Characterization of Novel Hydrocarbon-Degrading Euryhaline Consortia from Crude Oil and Mangrove Sediments |
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Authors: | María Piedad Díaz Steve JW Grigson Chris J Peppiatt J Grant Burgess |
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Institution: | (1) Centre for Marine Biodiversity and Biotechnology, Department of Biological Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, U.K., GB;(2) Department of Civil and Offshore Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, U.K., GB |
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Abstract: | Two novel and versatile bacterial consortia were developed for the biodegradation of hydrocarbons. They were isolated from
crude oil from the Cormorant Field in the North Sea (MPD-7) and from sediment associated with mangrove roots (MPD-M). The
bacterial consortia were able to degrade both aliphatic and aromatic hydrocarbons in crude oils very effectively in seawater
(35 g/L NaCl) and synthetic media containing 0 to 100 g/L NaCl (1.7 M). Salinities over twice that of normal seawater decreased
the biodegradation rates. However, even at the highest salinity biodegradation was significant. Ratios of nC17 to pristane
and nC18 to phytane were significantly lowered across the range of salinity. The lowest values were at 0 and 20 g/L (0.34
M). Phytane was degraded in preference to pristane. The degradation of these compounds was constant over the salinity range,
with evidence of a slight increase for consortium MPD-M with increasing salinity. In general, the consortium isolated from
mangrove root sediments was more efficient in metabolizing North Sea crude oil than the consortium isolated from Cormorant
crude oil. The 5 strains that comprise MPD-M have been tentatively identified as species of the genera Marinobacter, Bacillus, and Erwinia. This is the first report of hydrocarbon-degrading consortia isolated from crude oil and mangrove sediments that are capable
of treating oily wastes over such a wide range of salinity.
Received June 30, 1999; accepted May 29, 2000. |
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Keywords: | : euryhaline consortia crude oil mangrove sediment hydrocarbon degradation high salinity |
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