Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

Comparison of forest regeneration in two sites with different primate abundances in Northwestern Ecuador
PT 64-2 JUN 2016


Alouatta palliata
Ateles fusciceps fusciceps
Cebus capucinus
biogeographic Chocó region
seed dispersal
forest regeneration.
Alouatta palliata
Ateles fusciceps fusciceps
Cebus capucinus
Chocó biogeográfico
dispersión de semillas
puntos calientes de biodiversidad
regeneración de bosques.

How to Cite

Calle-Rendón, B. R., Peck, M., Bennett, S. E., Morelos-Juarez, C., & Alfonso, F. (2016). Comparison of forest regeneration in two sites with different primate abundances in Northwestern Ecuador. Revista De Biología Tropical, 64(2), 493–506.


There is increasing evidence that large-bodied primates play important roles as seed dispersers and in the maintenance of tree diversity in forest ecosystems. In this study we compared forest regeneration at two sites with differing primate abundances in the Ecuadorian Chocoan rainforest. We predicted: (1) significant differences in primate abundance between the two sites; (2) higher understory tree species richness and density at the site with greater primate abundance; (3) the site with lower primate abundance characterized by tree species dispersed by non-primate biotic agents and/or abiotic factors. We compared two sites, Tesoro Escondido (TE) a campesino cooperative, and the El Pambilar (EP) wildlife refuge that both maintain populations of mantled howler monkey (Alouatta palliata), the brown-headed spider monkey (Ateles fusciceps fusciceps) and the capuchin monkey (Cebus capucinus). We characterized canopy structure by point-quadrant sampling, determined primate abundance and sampled seedlings/saplings in 1 m2 plots, classifying tree species based on three dispersal syndromes: adapted for primate dispersal, dispersed by other biological agents, and abiotic dispersal. We compared sites in terms of primate abundance (groups and individuals observed per day) and regeneration characteristics (overall density, species richness, and dispersal syndrome). We carried out within site comparisons and constructed understory tree species accumulation curves. Overall the forests were structurally similar - with significantly higher densities of A. f. fusciceps at TE. Encounter rates for the other two primate species were similar at both sites. Understory tree density and species richness was significantly higher in TE with no stabilization of tree species accumulation curves. The species accumulation curve for understory trees at EP stabilized. Higher densities and species richness of primate dispersed tree species were observed at TE, with non-primate biotically dispersed tree species the dominant dispersal syndrome at both sites. Our observations are consistent with those from other studies investigating the role of large-bodied frugivorous primates in forest regeneration, and point to a general pattern: future lowland tropical forest tree diversity depends on maintaining robust populations of large primate species in these systems. It is highly probable that the maintenance of high levels of tree diversity in Chocoan rainforests is dependent on the conservation of its largest resident primate, the critically endangered brown-headed spider monkey (A. f. fusciceps).


Andresen, E. (2002). Primary seed dispersal by red howler monkeys and the effect of defecation patterns on the fate of dispersed seeds. Biotropica, 34, 261-272.

Andresen, E., & Levey, D. J. (2004). Effects of dung and seed size on secondary dispersal, seed predation, and seedling establishment of rain forest trees. Oecologia, 139, 145-154.

Arroyo-Rodríguez, V., Mandujano, S., & Cuende-Fanton, C. (2005). Ocupación de parches de selva por monos aulladores Alouatta palliata mexicana en tres paisajes con diferente grado de fragmentación en Los Tuxtlas, México. Universidad y Ciencia, 2, 23-34.

Barrera, V. A., Zambrano, J., & Stevenson, P. R. (2008). Diversity of regenerating plants and seed dispersal in two canopy trees from Colombian Amazon forests with different hunting pressure. Revista de Biología Tropical, 56, 1531-1542.

Beck-King, H., von Helversen, O., & Beck-King, R. (1999). Home range, population density, and food resources of Agouti paca (Rodentia: Agoutidae) in Costa Rica: a study using alternative methods. Biotropica, 31, 675-685.

Bodmer, R. E. (1991). Strategies of seed dispersal and seed predation in Amazonian ungulates. Biotropica, 23, 255-261.

Calle-Rendón, B. R., Moreno, F., & Cárdenas-López, D. (2011). Relación entre suelos y estructura del bosque en la Amazonía colombiana. Revista de Biología Tropical, 59, 1307-1322.

Carrillo, E., Won, G., & Cuarón, A. D. (2000). Monitoring mammal populations in Costa Rican protected areas under different hunting restrictions. Conservation Biology, 14, 1580-1591.

Carson, W. P., Anderson, J. T., Leigh Jr, E. G., & Schnitzer, S. A. (2008). Challenges associated with testing and falsifying the Janzen-Connell hypothesis: a review and critique. In W. P. Carson & S. A. Schnitzer (Eds.), Tropical forest community ecology (pp. 210-241). Oxford, United Kingdom: Wiley-Blackwell.

Casas, L. F. (2010). Heterogeneidad estructural de un bosque de tierra firme de la Amazonia colombiana y su relación con algunas variables ambientales (M. Sc. Dissertation). Universidad Nacional de Colombia, Colombia.

Chao, A. (1984). Nonparametric estimation of the number of classes in a population. Scandinavian Journal of Statistics, 11, 265-270.

Chapman, C. A. (1995). Primate seed dispersal: coevolution and conservation implications. Evolutionary Anthropology, 4, 74-82.

Colwell, R. K. (2013). EstimateS: Statistical estimation of species richness and shared species from samples, version 9.0. Storrs, USA: University of Connecticut. Retrieved from

Connell, J. H. (1971). On the role of natural enemies in preventing competitive exclusion in some marine animals and in rain forest trees. In P. J. den Boer & G. R. Gradwell (Eds.), Dynamics of populations (pp. 298-312). Wageningen, Holland: Pudoc.

Corlett, R. T., & Primack, R. B. (2008). Tropical rainforest conservation: a global perspective. In W. P. Carson, & S. A. Schnitzer (Eds.), Tropical forest community ecology (pp. 442-457). Oxford, United Kingdom: Wiley-Blackwell.

Dalling, J. W., & John, R. (2008). Seed limitation and the coexistence of pioneer tree species. In W. P. Carson, & S. A. Schnitzer (Eds.), Tropical forest community ecology (pp. 242-253). Oxford, United Kingdom: Wiley-Blackwell.

Defler, T. R. (2010). Historia Natural de los primates colombianos. Bogotá, Colombia: Universidad Nacional de Colombia and Conservación Internacional.

Defler, T. R., & Defler, S. B. (1996). Diet of a group of Lagothrix lagothricha lagothricha in southeastern Colombia. International Journal of Primatology, 17, 161-190.

DeWalt, S. J., & Chave, J. (2004). Structure and biomass of four lowland neotropical forests. Biotropica, 36, 7-19.

Effiom, E. O., Nuñez-Iturri, G., Smith, H. G., Ottosson, U., & Olsson, O. (2013). Bushmeat hunting changes regeneration of African rainforests. Proceedings of the Royal Society B-Biological Sciences, 280, 2013026.

Estrada, A., & Coates-Estrada, R. (1996). Tropical rain forest fragmentation and wild populations of primates at Los Tuxtlas, Mexico. International Journal of Primatology, 17, 759-783.

Forget, P. M., Muñoz, E., & Leigh Jr, E. G. (1994). Predation by rodents and bruchid beetles on seeds of Scheelea palms on Barro Colorado Island, Panama. Biotropica, 26, 420-426.

Galeano, G., Suárez, S., & Balslev, H. (1998). Vascular plant species count in a wet forest in the Chocó area on the pacific coast of Colombia. Biodiversity and Conservation, 7, 1563-1575.

Ganzhorn, J. U., Rakotondranary, S. J., & Ratovonamana, Y. R. (2011). Habitat description and phenology. In J. M. Setchell, & D. J. Curtis (Eds.), Field and laboratory methods in primatology: a practical guide (pp. 51-68). Cambridge, United Kingdom: Cambridge University Press.

Janzen, D. H. (1970). Herbivores and the number of tree species in tropical forests. The American Naturalist, 104, 501-528.

Jennings, S. B., Brown, N. D., & Sheil, D. (1999). Assessing forest canopies and understory illumination: canopy closure, canopy cover and other measures. Forestry, 72, 59-73.

Justicia, R. M. (2007). Ecuador’s Choco Andean corridor: a landscape approach for conservation and sustainable development (Ph. D. Dissertation). University of Georgia, United States of America.

Knogge, C., Heymann, E. W., & Tirado, E. R. (1998). Seed dispersal of Asplundia peruviana (Cyclanthaceae) by the primate Saguinus fuscicollis. Journal of Tropical Ecology, 14, 99-102.

Leighton, M., & Leighton, D. R. (1982). The relationship of size of feeding aggregate to size of food patch: howler monkeys (Alouatta palliata) feeding in Trichilia cipo fruit trees on Barro Colorado Island. Biotropica, 14, 81-90.

Link, A., & Di Fiore, A. (2006). Seed dispersal by spider monkeys and its importance in the maintenance of neotropical rain-forest diversity. Journal of Tropical Ecology, 22, 235-246.

McArthur, R. H., Diamon, J. M., & Karr, J. R. (1972). Density compensation in island faunas. Ecology, 53, 330-342.

McConkey, K. R., Aldy, F., Ario, A., & Chivers, D. J. (2002). Selection of fruit by gibbons (Hylobates muelleri × agilis) in the rain forests of Central Borneo. International Journal of Primatology, 23, 123-145.

Melo, O. A., & Vargas, R. (2002) Evaluación ecológica y silvicultural de ecosistemas boscosos. Ibagué, Colombia: Universidad del Tolima, CRQ, Carder, Corpocaldas and Cortolima.

Mendes, A. (1997). Habitat partitioning among primates in Maracá Island, Roraima, northern Brazilian Amazonia. International Journal of Primatology, 18, 131-157.

Ministerio del Ambiente (2011). Plan de Manejo del Refugio de Vida Silvestre El Pambilar. Quito, Ecuador: Ministerio del Ambiente.

Mittermeier, R. A., Myers, N., Thomsen, J. B., da Fonseca, G. A. B., & Olivieri, S. (1998). Biodiversity hotspots and major tropical wilderness areas: approaches to setting conservation priorities. Conservation Biology, 12, 516-520.

Mittermeier, R. A., Schwitzer, C., Rylands, A. B., Taylor, L. A., Chiozza, F., Williamson, E. A., & Wallis, J. (2012). Primates in peril: the world’s 25 most endangered primates 2012-2014. Bristol, United Kingdom: IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), Conservation International (CI) and Bristol Conservation and Science Foundation.

Moscoso, P., & Peck, M. (2012). A conservation strategy for the critically endangered brown-headed spider monkey (Ateles fusciceps) (Primates, Atelidae) in the Coop Tesoro (NW Ecuador). (Unpublished report prepared for Primenet).

Muller-Landau, H. C. (2008). Colonization-related trade-offs in tropical forests and their role in the maintenance of plant species diversity. In W. P. Carson, & S. A. Schnitzer (Eds.), Tropical forest community ecology (pp. 182-194). Oxford, United Kingdom: Wiley-Blackwell.

Myers, N. (1988). Threatened biotas:"hotspots" in tropical forests. Environmentalist, 8, 187-208.

Myers, N. (1990). The biodiversity challenge: expanded hot-spots analysis. Environmentalist, 10, 243-256.

Myers, N., Mittermeier, R. A., Mittermeier, C. G., da Fonseca, G. A. B., & Kent, J. (2000). Biodiversity hotspots for conservation priorities. Nature, 403, 853-858.

Nasi, R., Taber, A., & van Vliet, N. (2011). Empty forests, empty stomachs? bushmeat and livelihoods in the Congo and Amazon basins. International Forestry Review, 13, 355-368.

Nichols, E., Spectora, S., Louzadab, J., Larsenc, T., Amezquitad, S., Favilad, M. E., & The Scarabaeinae Research Network. (2008). Ecological functions and ecosystem services provided by Scarabaeinae dung beetles. Biological Conservation, 141, 1461-1474.



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