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外来植物互花米草通过沉积食性螺类进入盐沼食物网:稳定同位素与脂肪酸分析

发表时间:2017-02-16  浏览量:1247  下载量:226
全部作者: 王思凯,吴纪华
作者单位: 复旦大学生命科学学院;中国水产科学研究院东海水产研究所
摘 要: 外来植物入侵对土著消费者营养基础的改变以及对食物网营养结构的影响一直存在争议,并且在不同生态系统之间具有差异性。由于沉积食性消费者的食物来源复杂、鉴别困难,导致人们对这些消费者在遭受植物入侵后食性变化的认识还不清楚。本研究在长江口盐沼湿地土著植物芦苇(Phragmites australis)和入侵植物互花米草(Spartina alterniflora)生境,分别采集了两种优势螺类(绯拟沼螺Assiminea latericea和尖锥拟蟹守螺Cerithidea largillierti)及其主要的潜在食物来源(沉积物、悬浮颗粒物及植物),通过稳定同位素与脂肪酸相结合的方法,分析植物入侵对沉积食性消费者食源的影响。结果表明,绯拟沼螺和尖锥拟蟹守螺作为沉积食性消费者,主要从沉积物中同化吸收硅藻、细菌和维管植物。互花米草入侵没有改变螺类食源组成中硅藻、细菌和维管植物的相对含量,即没有改变其食性。绯拟沼螺比尖锥拟蟹守螺能够同化吸收更多的互花米草是因为绯拟沼螺本身能够摄取更多的植物。因此,研究表明互花米草能够通过优势螺类的取食同化进入到长江口盐沼湿地食物网中。
关 键 词: 生态学;盐沼;食物网;植物入侵;沉积取食者;长江口
Title: Incorporation of exotic Spartina alterniflora into salt marsh food webs through deposit-feeding snails: stable isotope and fatty acid analysis
Author: WANG Sikai, WU Jihua
Organization: School of Life Sciences, Fudan University; East China Sea Fisheries Research Intitute, Chinese Academy of Fishery Sciences
Abstract: Whether exotic plants change the energy base for native consumers, altering the trophic structure and food web interactions, is controversial and system specific. The response of deposit-feeding animals to plant invasions is unclear because their food sources are difficult to identify. We examined the effect of the exotic plant species, Spartina alterniflora, on the food source of two dominant snail species, Assiminea latericea and Cerithidea largillierti, in Yangtze river estuary salt marsh using combined stable isotope and fatty acid analysis. We collected the snails and potential food material (sediment organic matter, particulate organic matter, and plant material) in S. alterniflora and native plant Phragmites australis habitats. Our results indicated that A. latericea and C. largillierti were deposit feeders grazing sedimentary particles originating from diatoms, bacteria, and vascular plants. The invasive species S. alterniflora did not result in a change in the relative contribution of microalgae, bacteria, and vascular plants to the food source of the snails. The invasive S. alterniflora was confirmed to be assimilated by both snail species. The higher assimilation of S. alterniflora by A. latericea compared with C. largillierti was probably related to the greater ability of A. latericea to assimilate plant materials. Overall, S. alterniflora was incorporated into the food web of the estuarine salt marsh by the dominant snail species with generalist-feeding habits.
Key words: ecology; salt marshes; food web; plant invasions; deposit feeder; Yangtze river estuary
发表期数: 2017年2月第3期
引用格式: 王思凯,吴纪华. 外来植物互花米草通过沉积食性螺类进入盐沼食物网:稳定同位素与脂肪酸分析[J]. 中国科技论文在线精品论文,2017,10(3):271-280.
 
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2017-02-22 10:31:04
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