Effects of the 175m impoundment (the first time) in the stable carbon and nitrogen isotope ratios (13C/12C and 15N/14N) of different organisms in Hanfeng Lake from the Three Gorges Reservoir
Abstract:Stable carbon and nitrogen isotope ratios (13C/12C and 15N/14N) of primary producers and consumers were investigated between pre-impoundment and post-impoundment conditions in 2010, in order to describe the food web in the Hanfeng Lake. Overall the values of the primary producers, including particulate organic matter (POM), periphytic algae and aquatic plants samples, were -28.45‰~-24.78‰, -25.81‰~-21.22‰, -27.99‰~-23.74‰ for δ13C and 3.72‰~5.76‰, 3.23‰~4.81‰, 8.06‰~12.48‰ for δ15N, respectively. δ13C and δ15N in primary producers (except for aquatic plants) assumed an overall reduced tendency from pre-impoundment period to post-impoundment period. In addition, δ15N values in consumers presented an consistent variation trend to that in primary producers, while the δ13C values didn’t change significantly. Trophic level length of fish food web in Hanfeng Lake was three trophic levels (from pre-impoundment period to post-impoundment period) and the omnivorous fish whose carbon sources come from periphytic algae were the dominant group. These results showed that the aquatic ecosystem of Hanfeng Lake, which was a new artificial lake, had formed a relatively stable structure of fishes’ food web.
李斌, 徐丹丹, 王志坚, 岳兴建, 齐泽民, 张耀光. 三峡库区蓄水175m对汉丰湖不同生物类群δ13C、δ15N值的影响[J]. 中国环境科学, 2013, 33(8): 1426-1432.
LI Bin, XU Dan-Dan, WANG Zhi-Jian, YUE Xing-Jian, QI Ze-Min, ZHANG Yao-Guang. Effects of the 175m impoundment (the first time) in the stable carbon and nitrogen isotope ratios (13C/12C and 15N/14N) of different organisms in Hanfeng Lake from the Three Gorges Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(8): 1426-1432.