Fish diet modeling using δ13C and δ15N
We used the constant-feeding treatments (i.e., chironomid-only and feed-only in tanks and no-feeding in ponds) to illustrate the temporal pattern of muscle tissue isotopic transition in fish subjected to relatively constant diets. We modeled muscle tissue isotopic content transitions for these treatments using the following exponential equation (Cerling et al., 2007; MacAvoy et al., 2001; Tieszen et al.,