摘要
2010年三峡大坝首次成功蓄水到175m.为了探讨175m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.
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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2013年第6期1715-1721,共7页
Chinese Journal of Applied Ecology
基金
国家公益性行业(农业)科研专项(200903048-08)
中国长江三峡集团公司科研项目(G-12-08-01)资助
