Currently pursuing a PhD, my thesis work combines approaches and questions from aquatic ecology and environmental social sciences. Recent work in river ecology has shown that considering abiotic parameters alone does not allow us to predict the structure of species assemblages, particularly in environments that are most disconnected from the main channel. This result suggests the importance of other dominant factors in community organization, particularly the role of ecosystem processes (production and degradation of organic matter) on food webs. In this way, these new insights into river ecology could help to adjust ecological restoration measures, particularly those affecting the connectivity of different types of river channels. Mobilizing Science and Technology Studies and Political Ecology makes it possible to question the factors behind the emergence of this knowledge in the academic field and its potential transfer, appropriation, and even use in the management of hydrosystems. In this context, the objectives of my thesis are therefore to: (i) identify and characterize the effects of the connectivity of different types of channels on ecosystem processes, (ii) identify and characterize the effects of ecosystem processes on food webs, and (iii) examine the production of knowledge in river ecology (particularly that produced in (i) and (ii)) and its mobilization in management arenas.