崇明东滩大型底栖动物食源的稳定同位素示踪

doi:10.11849/zrzyxb.2008.02.016

自然资源学报 ›› 2008, Vol. 23 ›› Issue (2): 319-326.doi: 10.11849/zrzyxb.2008.02.016

崇明东滩大型底栖动物食源的稳定同位素示踪

余婕¹, 刘敏¹, 侯立军², 许世远¹, 欧冬妮¹, 程书波¹

1. 华东师范大学地理学系,教育部地理信息科学重点实验室,上海 200062;
2. 华东师范大学河口海岸科学研究院,上海 200062

收稿日期:2007-03-09 修回日期:2007-12-10 出版日期:2008-03-25 发布日期:2008-03-25
作者简介:余婕(1981- ),女,浙江定海人,博士生,主要从事环境地球化学研究工作。E-mail:jiefy2000@126.com
基金资助:
国家自然科学基金(40671171);华东师范大学优秀博士研究生培养基金项目。

Food Sources of Macrofaunal in East Chongming Salt Marsh as Traced by Stable Isotopes

YU Jie¹, LIU Min¹, HOU Li-jun², XU Shi-yuan¹, OU Dong-ni¹, CHENG Shu-bo¹

1. Key Laboratory of Geo-information Science of Ministry of Education, Department of Geography, East China Normal University, Shanghai 200062;
2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received:2007-03-09 Revised:2007-12-10 Online:2008-03-25 Published:2008-03-25

摘要/Abstract

摘要： 利用稳定同位素示踪技术,对崇明东滩盐沼湿地夏季不同生境大型底栖动物的食物来源和营养结构进行了初步研究。结果显示,表层沉积有机质稳定碳、氮同位素组成分别在-21.3‰~-24.2‰、4.6‰~5.6‰,不同生境下存在一定差异。植物体各组织的同位素值存在差异,在判别食物来源时需要注意,不能简单地以植物叶片值来代替整个植株。大型底栖动物的δ¹³C值为-14.7‰~-23.6‰,表现出食物来源的差异。总体上说,湿地优势植物的活植物体不是大型底栖动物的主要食物来源,沉积有机质是大部分底栖消费者的食物基础。底栖动物的氮同位素能较好地反映其食性和营养级,计算出崇明东滩大型底栖动物营养级在2.0~3.7,为一级消费者和二级消费者。

关键词: 海洋生物学, 底栖动物, 食源, 营养级, 碳同位素, 氮同位素, 崇明东滩

Abstract: East Chongming salt marsh,located in the east of Changjiang Estuary, is a large wetland, which exhibits a variety of macrobenthos. Understanding the food sources and trophic level of macrofauna is a foundation to study the material and energy flux in the ecosystem. In this paper, stable carbon and nitrogen isotope ratios of organic matter sources and consumers were investigated in the summer of 2005 in the differents living environments of East Chongming salt marsh. It is found that the δ¹³C and δ¹⁵N values of surface sediments vary in different tidal levels, with δ¹³C from-21.3‰ to-24.2‰ and δ¹⁵N from 4.6‰ to 5.6‰. These stable isotope values suggest that sediments not only contain the extraneous materials but also are influenced by the autochthonous organic matter. Our data displays that the dominant macrophytes Scirpus mariqueter and Phragmites australis are the main allochthonous sources of sedimentary organic matter and the extraneous source is suspended particulate organic matter. The dominant macrophytes Scirpus mariqueter and Phragmites australis are C₃ plants, and Spartina alterniflora is C₄ plant. The stable isotopes are variable among different tissues of plants, especially of Phragmites australis, which suggests that care must be taken and the isotope value of leaves may not be used as that of the whole plant when estimating the food sources. The macrofauna shows a wide range of δ¹³C, with overall δ¹³C values between -23.6‰ and -14.7‰, which suggests significant difference of food sources. As a whole, sedimentary organic matter seems to be food base for macrofauna, while the dominant macrophytes of salt marsh appears to play a negligible trophic role. The nitrogen isotope can reflect the trophic level of macrobenthos. It is calculated that trophic level of macrofauna in East Chongming salt marsh is between 2.0 and 3.7, and thus the invertebrates are primary and secondary consumers.

Key words: marine biology, macrobenthos, food source, trophic level, carbon isotope, nitrogen isotope, East Chongming salt marsh

中图分类号:

Q178.53

余婕, 刘敏, 侯立军, 许世远, 欧冬妮, 程书波. 崇明东滩大型底栖动物食源的稳定同位素示踪[J]. 自然资源学报, 2008, 23(2): 319-326.

YU Jie, LIU Min, HOU Li-jun, XU Shi-yuan, OU Dong-ni, CHENG Shu-bo. Food Sources of Macrofaunal in East Chongming Salt Marsh as Traced by Stable Isotopes[J]. JOURNAL OF NATURAL RESOURCES, 2008, 23(2): 319-326.

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崇明东滩大型底栖动物食源的稳定同位素示踪

Food Sources of Macrofaunal in East Chongming Salt Marsh as Traced by Stable Isotopes

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