TRACKING CHANGE IN THE ILLINOIS RIVER USING STABLE ISOTOPES IN MODERN AND ANCIENT FISHES
TRACKING CHANGE IN THE ILLINOIS RIVER USING STABLE ISOTOPES IN MODERN AND ANCIENT FISHES
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DOI：
10.1002/rra.3099
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发表时间：
2017-03-01
影响因子：
2.2
通讯作者：
Martin, T.
中科院分区：
文献类型：
--
作者：
Brugam, R. B.;Little, K.;Martin, T.
伊利诺伊河受到人类活动的严重影响。我们检测了两只美洲原住民的鱼骨中胶原蛋白的氮和碳稳定同位素组成，并将它们与今天河里的现代鱼类进行了比较。我们还将古代和现代鱼类与三个参考样本进行了比较--(I)伊利诺伊河浮游植物；(Ii)死水湖泊沉积物；(Iii)河边树木组织。我们发现现代鱼骨胶原蛋白中的增量N-15值相对于古代胶原蛋白有很大的增加。然而，古今样品之间的N-15增量变化不大。入侵鲤鱼的骨胶原蛋白与现代浮游植物相似。所有的鱼都不同于河边的树木和回水的湖泊沉积物。古代鱼类和现代鱼类之间的增量N-15值的巨大变化可能是由于芝加哥处理过的废水和反硝化肥流失对河流的污染造成的。我们的结果表明，现代河流中的氮生物地球化学发生了重大变化。古代和现代的增量N-15值之间的比较表明，古代和现代鱼类的摄食行为几乎没有变化。然而，我们关于入侵鲤鱼的数据表明，它与本土浮游生物存在着激烈的竞争。(C)2016年提交人。《河流研究与应用》由John Wiley&Sons Ltd.出版。
The Illinois River has been heavily modified by human activities. We examined the nitrogen and carbon stable isotope composition of collagen from fish bones in two Native American middens comparing them to modern fishes in the River today. We also compared ancient and modern fishes to three reference samples-(i) Illinois River phytoplankton; (ii) backwater lake sediment; and (iii) tissue from riverside trees. We found a large increase in delta N-15 values in modern fish bone collagen relative to ancient collagen. However, there is little change in delta N-15 between ancient and modern samples. Bone collagen from invasive carp species (Hypopthalmichthys and Cyprinus) are similar to modern phytoplankton. All fishes are different from riverside trees and backwater lake sediment. The large shift in delta N-15 values between ancient and modern fishes is probably caused by contamination of the river by Chicago treated wastewater and by denitrified fertilizer run-off. Our results indicate a major change in nitrogen biogeochemistry in the modern river. Comparisons between ancient and modern delta N-15 values suggest little change in feeding behaviour of fishes between ancient and modern times. However, our data for invasive carp suggest strong competition with native planktivores. (C) 2016 The Authors. River Research and Applications Published by John Wiley & Sons Ltd.