title: [Effects of Algicidal Substance on Phaeocystis globosa and Its Fatty Acids by the Simulation Experiment].
abstract: In order to evaluate the effects of algicidal substance on Phaeocystis globosa (P. globosa) and its algal toxin-fatty acids, the changes of chlorophyll-a, pH, dissolved oxygen, permanganate index and N, P concentration were evaluated by the simulation experiment. Fatty acids composition in P. globosa was detected by GC-MS. After adding algicidal substance in simulative water with the volume ratio 1: 100, the levels of chlorophyll-a, pH and permanganate index were reduced, while the concentrations of dissolved oxygen and N, P were increased significantly within 14 days. Comparing with control group after 14 days, pH was reduced to 7. 51 from 8. 50, chlorophyll-a and permanganate index were reduced by 82. 3% (P < 0. 05) and 55. 2% (P < 0. 01), respectively. Dissolved oxygen was significantly increased by 29. 5% (P < 0. 05). The concentrations of NH4+ -N, NO2- -N, NO3- -N and PO(4)3- -P were respectively 0. 46, 1. 50 , 6. 24 and 1. 30 times higher than that in control group. 14 days after the addition of algicidal substance, the total fatty acids of P. globosa were reduced by 83. 4%. The major fatty acids C18:2, C16:0, and C18:1, were reduced by 100%, 97. 7% and 85. 4% (P <0. 01), respectively. Our results indicated that algicidal substance from Bacillus sp. BI can effectively inhibit the growth of P. globosa and reduce the concentration of algal toxin-fatty acid in the simulation experiment. This study provides a theoretical basis for ecological safety of algicidal substance form Bacillus sp. strain Bl.
authors.forename: Qiu-chan
authors.initials: QC
authors.lastname: Yang
authors.forename: Ling
authors.initials: L
authors.lastname: Zhao
authors.forename: Ping-he
authors.initials: PH
authors.lastname: Yin
authors.forename: Shuo
authors.initials: S
authors.lastname: Tan
authors.forename: Wan-jiao
authors.initials: WJ
authors.lastname: Shu
authors.forename: Shao-ling
authors.initials: SL
authors.lastname: Hou
mesh_terms: D000898:Antibiosis; D001407:Bacillus / Q000737:chemistry; D001685:Biological Factors; D002734:Chlorophyll / Q000737:chemistry; D000077194:Chlorophyll A; D005227:Fatty Acids / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D058087:Haptophyta / Q000737:chemistry / Q000187:drug effects*
chemical_list: D001685:Biological Factors; D005227:Fatty Acids; D002734:Chlorophyll; D000077194:Chlorophyll A