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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 30, No. 4, 2009, pp. 418-422
Bioline Code: zr09063
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 30, No. 4, 2009, pp. 418-422

 en Analysis on Trophic Structure of Main Waterbirds in Qinghai Lake Based on Stable Isotopic Technology
Yang, Yue-qin; Yi, Xian-feng & Li, Ning

Abstract

Stable carbon and nitrogen isotopes were measured to analyze trophic level of main waterbirds in Qinghai Lake in May−June, 2008, based on the model of isotopic enrichment and the fractionation factor. Our results indicated that δ15N was significantly enriched in the muscle of waterbirds, but δ13C showed no obvious variation. We obtained a fractionation factor between Gymnocypris przewalskii check for this species in other resources and Phalacrocorax carbo check for this species in other resources , i.e., 1.78‰. Phytoplankton, zooplankton, Gammarus suifunensis check for this species in other resources , G. przewalskii and waterbirds were estimated at the trophic levels of 1.64−2.06, 2.35−2.83, 2.63, 3.64−4.20 and 3.35−4.93 respectively. P. carbo>, Larus ichthyaetus check for this species in other resources , Larus brunnicephalus check for this species in other resources and Podiceps cristatus check for this species in other resources occupied the highest trophic level due to their primary feeding on G. przewalskii. However, Tadorna ferruginea check for this species in other resources , Sterna hirundo check for this species in other resources , and Tringa totanus check for this species in other resources occupied the relatively high trophic levels. Anser indicus check for this species in other resources , mainly relying on plant materials as their food supply, was at the lowest trophic level. Our results predicted that the future resource situation of G. przewalskii would have great influence on the growth, reproduction and community structure of main waterbirds, especially for P. carbos, L. ichthyaetus, L. brunnicephalus and P. cristatus, consequently on the stability and diversity of the whole ecosystem.

Keywords
Waterbird; Trophic level; G. przewalskii; Stable isotope; Qinghai Lake

 
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