Trophic assimilation efficiency markedly increases at higher trophic levels in four-level host–parasitoid food chain
Dirk Sanders, Andrea Moser, Jason Newton, F. J. Frank van Veen
Proceedings of the Royal Society B, 2016
http://rspb.royalsocietypublishing.org/content/283/1826/20153043
たまたまassimilation efficiencyとあったので見てみたら，おお，d15Nをつかっているのではありませんか！
