detritivore: an organism that feeds on detritus; a decomposer; food chain: the feeding relationships between species in a biotic community; a linear path through a food web; trophic level: a particular position occupied by a group of organisms in a food chain (primary producer, primary consumer, secondary consumer, Dive in and learn why how this beautiful world is so fragileinterconnected. Dec 9, 2003. Food-web constraints on biodiversity–ecosystem functioning relationships. Elisa…