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We developed mathematical models that simulate community dynamics derivedfrom a series of perturbation experiments. These experiments were performed inan Atlantic Forest stream. The three trophic level community was submitted totwo combinations of press perturbation experiment. In the first, the toptrophic level was removed by electrical exclusion. In the second configuration,the top trophic level was still excluded plus a group of species from thesecond trophic level was inhibited, also by electrical pulses. Experiments wererepeated at different times to increase confidence in the observed mechanisms.Community responses indicated the existence of cascading interactions similarto a classic trophic cascade. The community was composed of Macrobrachiumshrimps at the top trophic level, Ephemeroptera and Chironomidae larval insectsat the second trophic level and periphyton (= epilithon = biofilm) at the firsttrophic level. The shrimp exclusion caused an increase in ephemeropterans andchironomids and led the periphyton to decrease in the exclusion zone. Whenephemeropterans were inhibited together with the exclusion of shrimps, thechironomids and the periphyton increased. We modelled the communityinteractions by means of differential equation systems, simulating the threeconfigurations: 1. natural condition, 2. shrimp exclusion condition and 3.shrimp-exclusion-plus-ephemeropteran-inhibition condition. All parameters werecalculated via experimental results and the stability of the models wasdetermined by their matrix eigenvalues. The models successfully reproduced thequalitative responses of the community. They proved to have attraction points,which enables us to predict that the system has some ability to return to itsprevious condition after local perturbation.

Dynamic modelling of a freshwater stream community from experimental field data