in the detritus samples and an unidentified species (10 days) in the controls. Some epi-growth feeders (Type 2A)also showed a positive response to the detritus 60 days post-placement, i.e. Desmodora cazca Gerlach (L.C), Dichromadora sp. (H.C), Chromaspirina sp. (H.L) and Paracanthochus sp. (H.M).