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枸杞岛近岸海域食物网的稳定同位素分析

蒋日进1,2,章守宇1**,王凯1,周曦杰1,赵静1   

  1. (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)
  • 出版日期:2014-04-10 发布日期:2014-04-10

Stable isotope analysis of the offshore food web of Gouqi Island.

JIANG Ri-jin1,2, ZHANG Shou-yu1**, WANG Kai1, ZHOU Xi-jie1, ZHAO Jing1   

  1. (1College of Marine Science and Technology, Shanghai Ocean University, Shanghai 201306, China; 2Marine Fisheries Research Institute of Zhejiang Province, Scientific Observing and Experimental Station of Fishery Resources for Key Fishery Grounds, Ministry of Agriculture, Zhejiang Province Key Laboratory for Technology Research on Sustainable Utilization of Marine Fishery Resources, Zhoushan 316021, Zhejiang, China)
  • Online:2014-04-10 Published:2014-04-10

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。

 

关键词: 光质, 叶片衰老, 内源激素

Abstract: 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 δ13C 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.

Key words: leaf senescence, light quality, endogenous hormone