Differential fractionation of δ13C and δ15N among fish tissues: implications for the study of trophic interactions

摘要: 1. Stable isotopes of nitrogen and carbon are widely used in the evaluation understanding trophic interactions, especially so aquatic food-webs. However, differences among tissues which occur consumers such as fish may confound resolution these ecological relationships, greatly affect dietary compositions calculated through mass-balance equations. 2. δ 13 C 15 N were determined for homogenized whole fry ( 2.7 g) particular (white muscle, red liver heart) juveniles (= 20.6 Rainbow Trout Oncorhynchus mykiss. 3. Differences observed tissues; removal lipid resulted becoming statistically indistinguishable but more variable C, particularly with higher content. be related to relative composition 'essential' 'non-essential' amino acids. 5. Acidification, is reduce variability caused by presence inorganic carbonate, had a significant effect on N, while having non-significant This was case ground fish-fry, contained 22.6% carbonates form bones scales, individual only very small amounts carbonate. 6. White muscle found less than all other tissues, probably best tissue use work. Red often closely associated white constitute source error material identification overlap.