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The article's aim is show an interpretation about environmental interdisciplinary perspective and the input of the network approach at this debate like a theoretical basis. Here still will be explain about the catfish's commercial network (example like a object between the city and nature relationship in the Amazon) show asks about interdisciplinary research in the Environmental Science. It's understood that interdisciplinary environmental studies require news approaches of the concepts and methods of the disciplinary areas. The network's understanding and analysis, encompass several disciplines and incorporate differents contents. Through catfish's commercial network, this article show a theoretical and methodological proposal to interdisciplinary research in environmental science. [ABSTRACT FROM AUTHOR]

The complexity of the relation city-countryside in the Amazonas state can be associated to the seasonality of the river system, specifically the high and low waters. When the river is in its high season, between the months of May and July the low lands are flooded, uniting rivers and lakes. This phenomenon characterized as interfluves turns places that are of difficult access during dry season easily linked and united by the fluvial network. In this sense, the spatial dynamics modifies itself seasonally and the "ribeirinho", traditional inhabitants that lives by the rivers, is mobile living in the city or in the countryside, navigating through the rural-urban networks. This mobility characterizes both rural and urban spacialities making there distinction difficult. In order to analyse this relation the production of açaí in Codajas, state of Amazonas. Analysing the açaí of Codajás will show that the counties of Amazonas state, specially those with small cities can not be understood without the social relationship of production that are constructed in this interfluve city-countryside. [ABSTRACT FROM AUTHOR]