Effects of reduced ultraviolet radiation on aqueous concentrations of dimethylsulfoniopropionate and dimethylsulfide during a microcosm study in the Lower St. Lawrence Estuary

被引:16
作者
Sakka, A
Gosselin, M
Levasseur, M
Michaud, S
Monfort, P
Demers, S
机构
[1] UNIV QUEBEC, DEPT OCEANOG, RIMOUSKI, PQ G5L 3A1, CANADA
[2] MINIST PECHES & OCEANS, INST MAURICE LAMONTAGNE, MONT JOLI, PQ G5H 3Z4, CANADA
[3] UNIV MONTPELLIER 2, LAB HYDROBIOL MARINE & CONTINENTALE, UNITE MIXTE RECH ECOSYST LAGUNAIRES, F-34095 MONTPELLIER 05, FRANCE
[4] INST NATL RECH SCI OCEANOL, RIMOUSKI, PQ G5L 3A1, CANADA
关键词
dimethylsulfide; dimethylsulfoniopropionate; phytoplankton; ultraviolet radiation; photooxidation; bacteria; microcosms; MARINE EUKARYOTIC ALGAE; B RADIATION; BETA-DIMETHYLSULPHONIOPROPIONATE; COCCOLITHOPHORE BLOOM; CARBOHYDRATE SOLUTES; QUATERNARY AMMONIUM; OSMOTIC ADJUSTMENT; TERTIARY SULFONIUM; GREEN MACROALGAE; SULFUR-COMPOUNDS;
D O I
10.3354/meps149227
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In August 1994, microcosm experiments were conducted with the natural phytoplankton community from the Lower St. Lawrence Estuary, Canada, in order to determine the influence of ultraviolet radiation (UVR) on the production of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS). The planktonic community was exposed for 42 h to 2 different Light regimes: natural light conditions and UVR reduced by 95% using UF3 filters. Throughout the experiments, flagellates dominated the algal community. During the first day, the production rate of DMS under reduced UVR was 4 times greater than under natural light conditions, suggesting a decrease in the loss rate of DMS under reduced UVR. There were no significant effects of the light regimes on particulate DMSP (DMSPp), dissolved DMSP (DMSPd), DMSPp/chlorophyll a and DMSPp/total algal cell number ratios during the first 24 h. During the second day, DMSP, concentrations, DMSPp/chlorophyll a and DMSPp/total algal cell number ratios increased significantly under reduced UVR whereas these variables decreased in the microcosms exposed to natural light conditions. These results suggest that the reduction of UVR favoured the accumulation of DMSP in algal cells. We conclude that the reduction of UVR affects the DMSP/DMS dynamics in seawater at 2 levels depending on the time frame considered: on a short-term basis (<24 h), it increases the DMS concentration, probably by decreasing its removal; on a long-term basis (>24 h), it increases algal DMSP content, probably by stimulating the synthesis and/or by inhibiting the excretion of DMSP.
引用
收藏
页码:227 / 238
页数:12
相关论文
共 70 条
[61]   BIOSYNTHESIS OF DIMETHYLSULFIDE AND DIMETHYLPROPIOTHETIN BY HYMENOMONAS-CARTERAE IN RELATION TO SULFUR SOURCE AND SALINITY VARIATIONS [J].
VAIRAVAMURTHY, A ;
ANDREAE, MO ;
IVERSON, RL .
LIMNOLOGY AND OCEANOGRAPHY, 1985, 30 (01) :59-70
[62]   THE INFLUENCE OF LIGHT-INTENSITY ON DIMETHYLSULFIDE PRODUCTION BY A MARINE DIATOM [J].
VETTER, YA ;
SHARP, JH .
LIMNOLOGY AND OCEANOGRAPHY, 1993, 38 (02) :419-425
[63]   EFFECT OF UV-B IRRADIANCE ON THE ATP CONTENT OF MICROORGANISMS OF THE WEDDELL SEA (ANTARCTICA) [J].
VOSJAN, JH ;
DOHLER, G ;
NIEUWLAND, G .
NETHERLANDS JOURNAL OF SEA RESEARCH, 1990, 25 (03) :391-393
[64]  
Watson R., 1988, Ozone Trends Panel: Executive Summary
[65]  
Winer B. J., 1971, STAT PRINCIPLES EXPT, V2
[66]   RELEASE AND CONSUMPTION OF DMSP FROM EMILIANIA-HUXLEYI DURING GRAZING BY OXYRRHIS-MARINA [J].
WOLFE, GV ;
SHERR, EB ;
SHERR, BF .
MARINE ECOLOGY PROGRESS SERIES, 1994, 111 (1-2) :111-119
[67]   EFFECTS OF METHYLATED, ORGANIC, AND INORGANIC SUBSTRATES ON MICROBIAL CONSUMPTION OF DIMETHYL SULFIDE IN ESTUARINE WATERS [J].
WOLFE, GV ;
KIENE, RP .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1993, 59 (08) :2723-2726
[68]   IMPROVED HPLC METHOD FOR THE ANALYSIS OF CHLOROPHYLLS AND CAROTENOIDS FROM MARINE-PHYTOPLANKTON [J].
WRIGHT, SW ;
JEFFREY, SW ;
MANTOURA, RFC ;
LLEWELLYN, CA ;
BJORNLAND, T ;
REPETA, D ;
WELSCHMEYER, N .
MARINE ECOLOGY PROGRESS SERIES, 1991, 77 (2-3) :183-196
[69]  
Zar JH., 1984, BIOSTAT ANAL, V2
[70]   OXIDATION OF DIMETHYL SULFIDE TO DIMETHYLSULFOXIDE BY PHOTOTROPHIC PURPLE BACTERIA [J].
ZEYER, J ;
EICHER, P ;
WAKEHAM, SG ;
SCHWARZENBACH, RP .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1987, 53 (09) :2026-2032