Seasonal variations in dimethylsulfoniopropionate and dimethylsulfide concentrations in relation to the plankton community in the St. Lawrence Estuary
Seasonal variations in dimethylsulfoniopropionate and dimethylsulfide concentrations in relation to the plankton community in the St. Lawrence Estuary
复制标题
DOI：
10.1016/j.ecss.2006.09.020
复制
发表时间：
2007-02
影响因子：
2.8
通讯作者：
S. Michaud;M. Levasseur;G. Cantin
中科院分区：
文献类型：
--
作者：
S. Michaud;M. Levasseur;G. Cantin
研究了1994年春季至秋季圣劳伦斯河口沿海固定站总二甲基磺酰丙酸（DMSPt）和二甲基硫化物（DMS）与浮游植物组合的周变化。DMSPt和DMS浓度具有较强的季节性，且在时间上紧密耦合。DMSPt和DMS的最高浓度出现在7月和8月，此时水温较暖，营养物浓度较低。8月初，DMSPt和DMS的季节最大值分别为365.4nmoll−1和14.2nmoll−1，与此同时，还有许多浮游植物的存在，如tamarense Alexandrium、Dinophysis acuminata、Gymnodinium sp.、Heterocapsa rotundata、protooperidinium ovatum、Scrippsiella trochoidea、Chrysochromulina sp. （6μm）、Cryptomonas sp. （6μm）、一组小于5μm的微鞭毛虫（mf<5）、许多tintinnids和Mesodinium rubrum。mf<5的丰度符合DMS浓度的总体趋势。卵形鞭毛藻的高丰度和DMSPt浓度的短暂出现表明，这种异养鞭毛藻既可以合成DMSP，也可以从富含DMSP的猎物中获取。海空DMS通量在8月1日达到最大值8.36μmol−2d−1。据估计，圣劳伦斯河口每年向大气排放的生物硫为77.2吨。
Weekly variations in total dimethylsulfoniopropionate (DMSPt) and dimethylsulfide (DMS) were investigated in relation to the phytoplankton assemblage from spring to fall 1994 at a coastal fixed station in the St. Lawrence Estuary. DMSPt and DMS concentrations showed a strong seasonality and were tightly coupled in time. Maximum concentrations of DMSPt and DMS were observed in July and August, during a period of warm water and low nutrient concentrations. Seasonal maxima of 365.4nmoll−1for DMSPt and 14.2nmoll−1for DMS in early August coincided with the presence of many phytoplankton species, such as Alexandrium tamarense, Dinophysis acuminata, Gymnodinium sp., Heterocapsa rotundata, Protoperidinium ovatum, Scrippsiella trochoidea, Chrysochromulina sp. (6μm), Cryptomonas sp. (6μm), a group of microflagellates smaller than 5μm (mf<5), many tintinnids, and Mesodinium rubrum. The abundance of mf<5 followed the general trend of DMS concentrations. The temporal occurrence of high P. ovatum abundance and DMSPt concentrations suggests that this heterotrophic dinoflagellate can either synthesize DMSP or acquire it from DMSP-rich prey. The calculated sea-to-air DMS flux reached a maximum of 8.36μmol−2d−1on August 1. The estimated annual emission from the St. Lawrence Estuary is 77.2tons of biogenic sulfur to the atmosphere.