The δ 15 N and δ 13 C levels of animals showed a clear trend of stepwise enrichment at each trophic level according to the following equations: 10) [9] δ C 13 ( ‰ ) = 1.8 ( TL - 1 ) - 29.4 ‰ [10] δ N 15 ( ‰ ) = 3.3 ( TL - 1 ) + 3.8 ‰ We demonstrate that carbon and nitrogen SIs can be successfully applied to elucidate trophic relationships and conclude that the pelagic food web of Lake Baikal has an ideal, isotopically ordered structure ( Fig. 5 ). b).
1
—
—