三峡库区175 m蓄水对小江回水区主要经济鱼类能量来源的影响

应用生态学报

三峡库区175 m蓄水对小江回水区主要经济鱼类能量来源的影响

李斌^1,2,王志坚¹,岳兴建²,王永明²,金丽¹,张耀光^1**

(¹西南大学生命科学学院淡水鱼类资源与生殖发育教育部重点实验室, 重庆 400715； ^2内江师范学院生命科学学院长江上游鱼类资源保护与利用四川省重点实验室, 四川内江 641112)

出版日期:2013-06-18 发布日期:2013-06-18

Influence of 175-m-impoundment in Three Gorges Reservoir Area on the food web energy sources of main commercial fishes in backwater area of Xiaojiang River.

LI Bin^1,2, WANG Zhi-jian², YUE Xing-jian², WANG Yong-ming², JIN Li¹, ZHANG Yao-guang¹

(¹Ministry of Education Key Laboratory of Freshwater Fish Reproduction and Development, School of Life Sciences, Southwest University, Chongqing 400715, China; ^2Sichuan Province Key Laboratory for Fishes Conservation and Utilization in the Upper Reaches of the Yangtze River, School of Life Sciences, Neijiang Normal University, Neijiang 642111, Sichuan, China)

Online:2013-06-18 Published:2013-06-18

摘要/Abstract

摘要： 2010年三峡大坝首次成功蓄水到175 m.为了探讨175 m蓄水对库区支流鱼类食物网能量来源的影响,采用稳定性同位素方法并结合多源线性混合模型(IsoSource模型)对小江回水区鲫、鲤、蒙古鲌、鲇、大鳍鳠、瓦氏黄颡鱼、光泽黄颡鱼等7种主要经济鱼类能量来源进行了分析.结果表明: 蓄水前(2010年7月),微型藻类是7种主要经济鱼类能量的主要来源;蓄水后(2010年12月),微型藻类对7种主要经济鱼类能量来源的贡献比例略有下降,而陆生C4植物的相对贡献比例明显增加,特别是对杂食性鲫和肉食性鲇的贡献率分别达到了38%～54%和32%～50%.蓄水后,鲫和鲇至少有30%的能量来自陆生C4植物.说明三峡大坝的蓄水过程增加了外源性C4植物对鱼类能量的贡献比例.

Abstract: The impoundment in the Three Gorges Reservoir Area (TGRA) was first reached 175 m in 2010. To approach the influence of this impoundment on the food web energy sources of fishes in the tributaries of TRGA, an analysis was made on the food web energy sources of seven economically important fishes (Carassius auratus, Cyprinus carpio, Silurus asotus, Culter mongolicus mongolicus, Mystus macropterus, Pelteobagrus vachelli, and Pelteobagrus nitidus) in the backwater area of Xiaojiang River by using stable isotope method in combining with IsoSource Model. The results showed that before this impoundment (July 2010), microalgae were the main energy sources for the seven species. After this impoundment (December 2010), the contribution ratio of the microalgae decreased somewhat, while the relative contribution of terrestrial C4 plants had an obvious increase. Especially for crucian carp (C. auratus) and catfish (S. asotus), the contribution rate of the C4 plants reached 38-54% and 32-50%, respectively. After the impoundment, at least 30% of the energy resources of these two fishes were come from terrestrial C4 plants, suggesting that the impoundment in TGRA increased the contribution rate of exogenous terrestrial C4 plants as the energy sources of fishes.

李斌1,2,王志坚1,岳兴建2,王永明2,金丽1,张耀光1**. 三峡库区175 m蓄水对小江回水区主要经济鱼类能量来源的影响[J]. 应用生态学报.

LI Bin1,2, WANG Zhi-jian2, YUE Xing-jian2, WANG Yong-ming2, JIN Li1, ZHANG Yao-guang1. Influence of 175-m-impoundment in Three Gorges Reservoir Area on the food web energy sources of main commercial fishes in backwater area of Xiaojiang River.[J]. Chinese Journal of Applied Ecology.