Seasonal variations in fish δ¹³C and δ¹⁵N in two West African reservoirs, Sélingué and Manantali (Mali): Modifications of trophic links in relation to water levelFootnote§

§ Revised version of a paper presented at the 4^th International Conference on Applications of Stable Isotope Techniques to Ecological Studies, April 19–23, 2004, Wellington, New Zealand.

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