title: Effects of decabromodiphenyl ether (BDE-209) on inter-specific competition between two species of marine bloom-forming microalgae.
abstract: Decabromodiphenyl ether (BDE-209), a new kind of persistent organic pollutants, was selected to investigate its influence on population growth and inter-specific competition between two species of marine bloom-forming microalgae, Heterosigma akashiwo and Karenia mikimotoi. (1)BDE-209 showed acute toxic effects on both microalgae and H. akashiwo was more sensitive from view of 96 h-EC50 and the ultrastructure variation. (2)The microalgal population growth patterns in mono-culture were density-dependent and the growth of both species in the normal co-culture was significantly depressed by competition (P<0.05) with different initial biomass ratios. BDE-209 exposure significantly changed the growth. (3) Lotka-Volterra competition model was used to simulate the interaction between the microalgae. BDE-209 exposure broke the competitive balance to make competition gradually shift in favor of H. akashiwo. Results suggested BDE-209 did have toxic effects on either microalgal growth or the inter-specific competition, which was quite different from previous reports. Further exploration of the mechanism is needed.
authors.affiliation: Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao, China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Zhang
authors.forename: Xuexi
authors.initials: X
authors.lastname: Tang
authors.forename: Bin
authors.initials: B
authors.lastname: Zhou
authors.forename: You
authors.initials: Y
authors.lastname: Wang
mesh_terms: D018533:Biomass; D055768:Halogenated Diphenyl Ethers / Q000494:pharmacology*; D058086:Microalgae / Q000254:growth & development*; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000494:pharmacology*
chemical_list: D055768:Halogenated Diphenyl Ethers; D014874:Water Pollutants, Chemical; C010902:decabromobiphenyl ether
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