The creation of Transboundary Biosphere Reserves (TBRs) is one of the most outstanding contributions of the United Nations Educational, Scientific, and Cultural Organization (UNESCO) Man and Biosphere Programme (MAB). Recent revisions have shown that there is a gap between its biodiversity conservation proposals and the theoretical convergence of nations towards sustainable development goals with the practices in action. By applying the landscape approach to the case study of the rural system of the Spanish–Portuguese border, declared Meseta Ibérica TBR (MITBR), it is verified that the spatial zoning of TBRs is a prominent factor in this gap, since they do not correspond to the landscape units and bioregions. This has led to the formulation and implementation of strategic proposals for the reorientation of TBRs towards the stimulation of landscape networks in the transboundary framework. Agroecological networks in this territory stand out, which brings together one of the highest concentrations of indigenous breeds in Europe. A breeder replacement experience was carried out based on the social networks of the MITBR that protect the landscape. The main conclusion of this article is that TBRs are effective in practice through the promotion of cross-border networks of governance and social participation, and mainly through agroecological ones due to their outstanding effect on biodiversity.

Agricultural policies show an orientation in the management of natural resources, such as water, towards specialized production for world markets. This is promoting models of private use against those of common use. The objective of this research is to evaluate the transformations in the institutional framework associated with the change of vision of water and the pressures created on peasant communities that culturally maintain socio-ecological systems. Based on Ostrom’s methodological proposals for the governance of common goods, a case study of the Rio Portoviejo Basin (Ecuador) was carried out. The three developed management models are analyzed: public, private and community. Evidence is provided that the community model is more equitable, efficient and sustainable. The way in which the extension of the market model, which conditions agricultural activity to profitability, is weakening the networks of peasant communities is also studied. In this context, the correlation between the loss of the traditional agrarian culture and the environmental degradation of the area is observed.