Test  of  the  energetic  hypothesis for the restriction of food chain
   length.   Researchers   manipulated   the   productivity  of  treehole
   communities  in  Queensland, Australia, by providing leaf litter input
   at  three levels: high litter input = natural (control) rate of litter
   fall;  medium  =  1 / 10 natural rate; and low = 1 / 100 natural rate.
   Reducing  energy  input reduced food chain length, a result consistent
   with the energetic hypothesis.