枸杞岛近岸海域食物网的稳定同位素分析  

Stable isotope analysis of the offshore food web of Gouqi Island

作　　者：蒋日进[1,2] 章守宇[1] 王凯[1] 周曦杰[1] 赵静[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]浙江省海洋水产研究所,农业部重点渔场渔业资源科学观测实验站,浙江省海洋渔业资源可持续利用技术研究重点实验室,浙江舟山316021

出　　处：《生态学杂志》2014年第4期930-938,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41176110);国家重点基础研究发展计划项目(2011CB111608);浙江省自然科学基金项目(LY13D060006)资助

摘　　要：为了探明岛礁近岸海域食物网主要生物类群之间的营养关系,对2012年11月和2013年2月枸杞岛近岸的消费者及其潜在食物源的稳定碳、氮同位素组成进行了分析,并利用氮稳定同位素数据计算了消费者的营养级。结果表明:枸杞岛近岸海域消费者潜在食源浮游植物、POM、SOM和大型海藻的δ13C值范围为-21.7‰^-14.7‰,浮游动物、大型无脊椎动物和鱼类等消费者的δ13C值范围为-21.1‰^-13.7‰。初级生产者的C/N平均值为8.5,消费者的C/N平均值3.7,差异极显著(P<0.001)。根据消费者的δ15N值,可将枸杞岛近岸海域的消费者分为滤食性浮游动物、食藻或碎屑的小型底栖动物、杂食性的大型无脊椎动物和鱼类以及凶猛的肉食性鱼类4大类,消费者共有4个营养等级,黑鲷的营养级最高为4.33。To find out the trophic relationships among main biological groups in the offshore food web of Gouqi Island, this study analyzed δ13C and δ15N compositions of the offshore consumers and their potential food sources collected in November 2012 and February 2013. The trophic levels of consumers were calculated based on the stable N isotope ratio. The results showed that the δ13C values of potential food sources-the phytoplankton, POM, SOM and macroalgae ranged from -21.7‰ to -14.7‰, and the δ13C values of zooplankton, macroinvertebrate and fish ranged from -21.1‰ to -13.7‰. The average C/N ratios of the primary producers and the consumers were 8.5 and 3.7 respectively, with a significant difference between them （P〈0.001）. Based on the δ15N values, the consumers could be divided into four trophic levels namely filterfeeding zooplankton, detritivorous/alage small-sized benthic animals, omnivorous animals, and fierce carnivorous fish. The trophic level of Sparus macrocephlus was 4.33, ranking the highest.

关 键 词：稳定同位素 食物网 岩礁 营养级 

分 类 号：Q178.53[生物学—水生生物学]