My main interests are related to try to analyze and understand current Amazonian tree species community turnover as well as the different historic and evolutionary processes underlying it. The results of my previous work confirm the existence of a strong and abrupt floristic disruption at different scales within areas of younger nutrient-rich clay and sandy soils in Ecuadorian Amazonia and affinities between some of these areas with forests on white sand soils strongly influenced by more ancient geological formations (Guyana Shield, Brazilian Shield). This evidence challenges the notion about the importance of dispersal and edaphic partitioning as well as neutral models of tree species distribution in northwestern Amazonia and suggests questions about historical and evolutionary specialization in the Amazon basin. The first step in this process is to extend my current research to unexplored areas of Ecuadorian Amazonia, and extend the establishment of plots series to Brazil, Peru and Colombia including phylogenetic and functional traits analysis in certain well-known large widespread lineages as well as monotypic lineages.

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Publications:


Edwin Pos, Juan Ernesto Guevara Andino, Daniel Sabatier, Jean-François Molino, Nigel Pitman, Hugo Mogollón, David Neill, Carlos Cerón, Gonzalo Rivas, Anthony Di Fiore, Raquel Thomas, Milton Tirado, Kenneth R. Young, Ophelia Wang, Rodrigo Sierra, Roosevelt García-Villacorta, Roderick Zagt, Walter Palacios, Milton Aulestia, Hans ter Steege. 2014. Are all species necessary to reveal ecologically important patterns? Submitted to Ecology and Evolution.

Pitman, N.C.A., Guevara Andino J.E, J. E., Aulestia, M., Cerón, C., Neill, D.A., Palacios, W. Rivas, G. 2014. Distribution and abundance of tree species in swamp forest in Amazonian Ecuador. Ecography. DOI: 10.1111/ecog.00774

ter Steege, H., N.C.A. Pitman, D. Sabatier, C. Baraloto, R. de Paiva Salomão, J.E. Guevara, et al. 2013. Hyper dominance in Amazonian tree Flora. Science 342: 1243092

Guevara, J., Pitman, N.C.A.P., Cerón, C., Mogollón, H., García–Villacorta, R., Aulestia, M., Palacios, W. 2013. Influence of geology, soils and climatic variables in phylogenetic diversity turnover along a longitudinal gradient in Western Amazonia. In prep.


Guevara, J. E. , Pitman, N.C.A.P., Cerón, C., Mogollón, H., García-Villacorta, R., Aulestia, M., Palacios, W. 2012. BETA DIVERSITY IN THE ECUADORIAN AMAZONIA TREE SPECIES COMMUNITY. In prep.  


Couvreur, T.L.P., Jeanson, M.L, Guevara, J.E., Henderson, A.J. 2010. PALMS OF THE SOUTH WEST GALERAS CORDILLERA, A REMOTE PREMONTANE RAIN FOREST IN EASTERN ECUADOR. Palms 54 (2) 94-110. 


Stropp, J., ter Steege, H., Malhi, Y., ATDN, RAINFOR. 2009. DISENTANGLING REGIONAL AND LOCAL TREE DIVERSITY IN THE AMAZON (AUTHORSHIP THROUGH COLLECTIVE AUTHOR A.T.D.N.). Ecography 32(1): 46-54


Guevara, J., Pitman, N.C.A.P., Mogollon, H., García-Villacorta, R., Cerón, C., Palacios, W. 2009. VARIACIN FLORSTICA EN 23 PARCELAS DE 1HA EN BOSQUES DE TIERRA FIRME EN LA AMAZONIA NORTE ECUATORIANA. Cinchonia 9 (1) 75-93.


Pitman, N.C.A, Mogollón, H., Dávila, N., Ríos, M., García-Villacorta, R., Guevara, J., Ahuite, M., Aulestia, M., Cardenas, D., Cerón, C.E., Neill, D.A, Núñez P.V., Palacios, W., Phillips, O.L., Spichiger, R., Valderrama, E. and Vásquez-Martínez R. 2008. TREE COMMUNITY CHANGE ACROSS 700 KM OF LOWLAND AMAZONIAN FOREST FROM THE ANDEAN FOOTHILLS TO BRAZIL. Biotropica 40(5):525 - 654.

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