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当前位置: 首页 > 文章 > 珠江河网典型段基础碳源对水生动物的贡献 生态学杂志 2018 (8) 2403-2410
Position: Home > Articles > Contribution of basal carbon sources to aquatic animals in typical sections of the Pearl River Chinese Journal of Ecology 2018 (8) 2403-2410

珠江河网典型段基础碳源对水生动物的贡献

作  者：
曾艳艺;杨婉玲;李海燕;彭松耀;赖子尼
关键词：
C3植物;浮游植物;沉水水草;稳定同位素;IsoSource
摘  要：
于2015年3、8月分别采集珠江河网3个江段的潜在基础碳源及优势种水生动物,测定其δ13C和δ15N值,利用IsoSource软件分析不同江段各类群碳源对水生动物的贡献。结果表明:上游宽阔江段主贡献碳源来自C3植物,其对该站位消费者50%置信水平上的贡献率超出50%;下游水草床茂盛江段主贡献碳源为沉水水草,其对该站位消费者贡献率接近或超出50%,C3植物变为次贡献碳源;而河网分叉江段主贡献碳源为浮游植物,其对该站位消费者贡献率接近或超出40%,沉水水草和C3植物为共同次贡献碳源。珠江河网不同类型江段的主贡献碳源变化特征可能由该江段的碳源储量及消费者的生物可利用性共同决定。对多元化河流栖息生境的保护是维持珠江河网生态系统功能完整的关键环节。
译  名：
Contribution of basal carbon sources to aquatic animals in typical sections of the Pearl River
作  者：
ZENG Yan-yi;YANG Wan-ling;LI Hai-yan;PENG Song-yao;LAI Zi-ni;Pearl River Fisheries Research Institute,Chinese Academy of Fishery Science;
单  位：
ZENG Yan-yi%YANG Wan-ling%LI Hai-yan%PENG Song-yao%LAI Zi-ni%Pearl River Fisheries Research Institute,Chinese Academy of Fishery Science
关键词：
C3 plant;;phytoplankton;;submersed plant;;stable isotope;;IsoSource
摘  要：
The destruction of riverine habitats and the decline in the integrity of aquatic functions is a problem in the Pearl River due to over-exploitation and over-utilization of water resources. To protect river habitats and maintain the integrity of river ecosystems in the Pearl River,we need to know how different carbon sources contribute to the aquatic food web. The potential basal carbon sources and dominant consumers were sampled in three typical sections of the Pearl River in March and August 2015,with the δ13 C and δ15 N of potential carbon sources and dominant consumers being then determined. The Iso Source estimation results showed that,in the wide-open water upstream habitats,C3 plants contributed more than 50%(within the 50% confidence level) to the dominant consumers. The downstream habitats were covered by large areas of submersed plants,which contributed almost,or more than 50%(within the 50% confidence level)to local consumers. In the downstream habitats,submersed plants became the dominant source to most consumers,while C3 plants were the secondary carbon source. In the bifurcation section,phytoplankton contributed nearly or more than 40%(within the 50% confidence level) to the local consumers and became the dominant source supporting many consumers,while both submersed plants and C3 plants were secondary sources. Therefore,the primary contribution sources to local consumers varied in different river sections with different habitats,which may be related to the proportion of different carbon sources and their availability to consumers. Our results suggest that the conservation of multiple habitats is essential for maintaining the functional integrity of aquatic ecosystems of the Pearl River.

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