Plant − ant − fungus communities investigated through qualitative modelling

摘要: Qualitative models are applied to investigate aspects related the activities of leaf-cutting ant populations, pernicious agents in tropical areas New World for productivity forests and crop fields. The modelling approach allows global evaluation interactions occurring a natural system. In particular, loop analysis one qualitatively handle dynamic behaviour complex systems subject external actions that tend modify their parameters. peculiar mutualism between these insects some Basidiomycetes is articulated on subtle behavioural biochemical mechanisms which confer primary role ants processes organic decomposition mineral cycling. If adds diverse forms interaction undertake with other organisms variety functions they carry out, obtains picture would be reductive analyse only from point view food chain, under hypothesis simple two trophic level structures. complexity community system generates feedback condition dynamics components, involve cause-effect easily missed when intuitive or linear interpretations prevail. Alterations parameters carried control harmful action can generate situations opposite expectations, as shown here investigated.