El estudio tuvo como objetivo determinar los componentes de la diversidad arbórea asociada a las parcelas productoras de café en la provincia de Rodríguez de Mendoza, en el nororiente del Perú. Para este fin, se visitaron 32 fincas con distintos arreglos cafetaleros. En cada finca se evaluaron dos cuadrantes de 20*20 metros, y, para la recolección de los datos se empleó la observación sistemática. Los datos fueron analizados con estadística descriptiva. Los resultados indican que en la zona de estudio existen 19 especies arbóreas distintas. En cuanto a la abundancia (a) y riqueza (b) arbóreas promedio, entendidas como componentes de la diversidad alfa, se estimaron para cuatro tipos de sistemas cafetaleros: diversificado certificado (a=8.56, b=2.17), diversificado no certificado (a=5.58, b=1.92), convencional certificado (a=3.19, b=1.19) y convencional no certificado (a=2.28, b=0.89). Por tanto, se concluye que la diversidad alfa arbórea decrece desde los sistemas más amigables a los menos amigables con la conservación de la diversidad. Para futuras investigaciones, se recomienda replicar la metodología empleada en otras provincias cafetaleras ampliando el tamaño de muestra con la finalidad de fortalecer las conclusiones expuestas.

The various ecosystem services related to water form a complex structure that impacts on human well-being so it is necessary to know the relationships between their attributes to support decision making for water security. Our work investigates individual preferences for water ecosystem service attributes in the Tilacancha River Microbasin, in northern Peru, using two methods of a different nature. In that context, prioritization results using Choice Experiments and Analytic Hierarchy Process are compared for their abilities to represent purchase preferences and theoretical preferences, respectively. Both methods reveal that in a context of abundant water resources, the public has a higher preference for the attributes Quality Maintenance and Water Regulation, over Sediment Control and Water Yield, which were less valued. The differences allowed us to identify possible applications of the results useful for water security management. Additionally, we conclude that it is possible to combine the results of both methods to support decision making, and we highlight the specific cases in which it is appropriate to use the methods individually.

The maximum cadmium tolerance standards were established by the European Union in 2014, for the importation of cocoa-based products, causing concern in the countries. Global studies on Theobroma cacao research related to cadmium activity in the atmosphere were analyzed. Bibliometric analyses in R and VOSviewer programs were used to examine 64 documents published in the Scopus database according to keywords. We identified 811 keywords in the co-occurrence of terms, 5 thematic groups in the bibliographic coupling, 20 institutions as most important affiliations, 20 countries of origin of corresponding authors, 112 institutions in co-authorship network of which 5 are in primary documents, and two groups in thematic similarity in co-citation of documents. The United States leads the scientific production with 11 papers, followed by Colombia (8) and Ecuador (7). In 1996, the first scientific article was registered for the network, with increases of up to 11 publications by 2020. In conclusion, the need to strengthen and create more research networks between countries, institutions, authors, and co-authors is evident. It is hoped that the results will allow a comprehensive unraveling of the cadmium-cocoa research trajectory, while at the same time yielding new prospective research.