| Autor: |
Shannon, J. P., Blinn, D. W., Haden, G. A., Benenati, E. P., Wilson, K. P. |
| Zdroj: |
Isotopes in Environmental and Health Studies; November 2001, Vol. 37 Issue: 3 p179-191, 13p |
| Abstrakt: |
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. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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