Food Web Implications of δ13C and δ15N Variability over 370 km of the Regulated Colorado River USA
Food Web Implications of δ13C and δ15N Variability over 370 km of the Regulated Colorado River USA
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美国科罗拉多河 370 公里范围内 δ13C 和 δ15N 变化对食物网的影响
DOI：
10.1080/10256010108033294
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发表时间：
2001
影响因子：
1.3
通讯作者：
K. P. Wilson
中科院分区：
文献类型：
--
作者：
J. Shannon;D. Blinn;G. A. Haden;E. P. Benenati;K. P. Wilson
摘要通过美国大峡谷国家公园的科罗拉多河的双稳定同位素分析，揭示了在干旱的生物群落中空间变化的食物网。下游富集的δ 13 C数据被检测到跨越三个营养级，导致转移的食物网。来自肌肉栓和鳍夹的Humpack Chub δ 13 C和δ 15 N值没有显著差异。驼背鲢鱼和虹鳟鱼的营养位置是正相关的标准长度，表明在鱼食较大的鱼类增加。本文讨论了格伦峡谷大坝蓄水后水生生物群落的恢复以及大型河流中稳定同位素分析的收集改进。
Abstract Dual stable isotope analysis in the regulated Colorado River through Grand Canyon National Park, USA, revealed a food web that varied spatially through this arid biome. Down-river enrichment of δ13C data was detected across three trophic levels resulting in shifted food webs. Humpack chub δ13C and δ15N values from muscle plugs and fin clips did not differ significantly. Humpback chub and rainbow trout trophic position is positively correlated with standard length indicating an increase in piscivory by larger fishes. Recovery of the aquatic community from impoundment by Glen Canyon Dam and collecting refinements for stable isotope analysis within large rivers are discussed.