摘要
中国水产科学研究院南海水产研究所"南锋号"科考船在2012年2月22日—3月20日调查期间,对南海南部海域0 m、75 m和150 m层水体悬浮颗粒物进行了脂肪酸(FA)组成的研究。FA含量在表层、75 m层和150 m层的变化范围分别为9.9—15.65μg/L,10.45-14.45μg/L和9.65—16.45μg/L。FA与叶绿素a的比值垂向变化非常大,在表层和150 m层都大于70,而在75 m层小于30(除A7)。悬浮颗粒物的FA组成以饱和脂肪酸和单不饱和脂肪酸为主,而多不饱和脂肪酸含量较低。饱和脂肪酸主要包括C16:0和C18:0,其次是C12:0,单不饱和脂肪酸主要包括C14:1n3、C16:1n7和C16:1n9,多不饱和脂肪酸主要为C18:2n6和C22:2n6。主成分分析表明,第一主成分主要与C16:0、C18:0、C20:0等正相关,可认为第一主成分主要表征浮游植物和碎屑,而第二主成分所表征的可能与浮游动物等有关的信息。悬浮颗粒物的脂肪酸标记物中,C16:1n7/C16:0和∑C16:1/∑FA之间呈显著正相关,同时C16:1n7/C16:0与∑C18/∑FA呈显著负相关,将C16:1n7/C16:0和C16:1/∑FA结合起来适宜于指示硅藻类的组成,∑C18/∑FA可用来指示甲藻类组成。
Some fatty acids （FA） are specific to individual classes of organisms and attempts to trace organic materials in the ocean. Fatty acid markers have been widely used to trace or confirm predator-prey relationships so as to illustrate the key trophic linkages in the marine ecosystem. Suspended particulate matter from Om, 75 m and 150 m were collected to better understand the fatty acid composition and its fatty acid biomarkers in the southern South China Sea. The cruise was conducted by ＂NanFeng＂ RV from February 22 to March 30, initiated by South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences. The range of FA contents were 9.9--15.65 μg/L, 10.45 --14.45 μg/L and 9.65-- 16.45 μg/L at 0 m, 75 m and 150 m, respectively. FA contents indicate that vertical change of FA contents was unobvious. Deep chlorophyll a （Chl a） maximum phenomenon was popular in South China Sea, thus FA/Chl a concentration varied in the water column obviously. The ratio of FA/Chl a was higher than 70 at surface and 150m layer, while lower than 30 at75m layer （except A7）. Saturated fatty acids （SFA） and mono-unsaturated fatty acids （MUFA） dominated total fatty acid contents in all SPM from each layer. Major SFA was C16：0, C18：0 and C12：0. Major MUFA were C14：1n3, C16：1n7 and C16：1n9, and major polyunsaturated fatty acids （PUFA） were C18：2n6 and C22： 2n6. Principle components analysis （PCA） revealed that PC1 was positively related to C16：0, C18：0 and C20：0 concentrations, so PC1 maybe the indicator of phytoplankton and debris. PC2 may be represented the information of zooplankton. Within five FA biomarkers, C16：1n7/ C 16 ： 0 was positively related to C 16 ： 1/∑ FA, while negatively related to ∑ C 18/∑ FA, so the combination of C 16 ： 1 n7/ C16：0 and C 16：1/∑ FA can be considered as FA biomarker of diatoms, and ∑ C 18! ∑ FA also can be applied to indicate dinoflagellate.
出处
《生态学报》
CAS
CSCD
北大核心
2014年第10期2599-2607,共9页
Acta Ecologica Sinica
基金
农业部财政重大专项(NFZX2013)
公益性行业(农业)科研专项(201403008)
中央级公益性科研院所基本科研业务费(中国水产科学研究院南海水产研究所)资助项目(2013TS07)
广东省自然科学基金(S2013040016424)
农业部南海渔业资源开发利用重点实验室开放基金(LSF201105)
中国科学院热带海洋生物资源与生态重点实验室开放基金(LMB111010)
关键词
南海
悬浮颗粒物
脂肪酸
South China Sea
suspended particulate matter
fatty acid
