Center for Tropical Research, UCLA Institute of the Environment & Sustainability

Dja Biosphere Reserve, Cameroon

Summary

Region: Africa

During the past 20 years, scientists from the Center for Tropical Research have been conducting research in the Dja Biosphere Reserve (DBR), a UNESCO World Heritage site located in South Central Cameroon. The reserve comprises over 500,000 hectares, making it one of Central Africa’s largest protected areas. Research began in 1993 with the establishment of the Bouamir research camp and 25-square-kilometer study site located near the center of the reserve. Since that time, research has focused on the role of vertebrate seed dispersers, particularly birds and primates, the impacts of hunting on vertebrate populations and on the genetics of the trees they disperse, conservation genetics, mechanisms of speciation, and disease research, both in the reserve and in adjacent areas.

Hornbill Project and Video

A short video of the research team capturing hornbills

Long-distance Movements and Resource Use by Hornbills in Cameroon (click here to download PDF).

Photos

Related Publications

2013 Smith, T.B., R. Harrigan, A. Kirsche, W. Buermann, S. Saatchi, D. Blumstein, S. de Kort, H. Slabbekoorn. Predicting birdsong from space. Evolutionary Applications. DOI: 10.1111/eva.12072. PDF
2011 Njabo, K.Y., A. J. Cornel, C. Bonneaud, E. Toffelmier, R. N. M. Sehgal, G. Valkiunas, A. F. Russell, and T. B. Smith. Nonspecific patterns of vector, host and avian malaria parasite associations in a Central African rainforest. Molecular Ecology 20: 1049-1061. PDF
2011 Sehgal, R. N. M., W. Buermann, R. J. Harrigan, C. Bonneaud,  C. Loiseau, A. Chasar, I. Sepil, G. Valkiunas, T. Iezhova, S. Saatchi, and T. B. Smith. Spatially explicit predictions of blood parasites in a widelydistributed African rainforest bird. Proceedings of the Royal Society B. 278: 1025-1033. PDF
2010 Loiseau, C., T. A. Iezhova, G. Valkiunas, A. Chasar, A. Hutchinson, W. Buermann, T. B. Smith, and R. N. M. Sehgal. Spatial variation of haemosporidian parasite infection in African rainforest bird species. Journal of Parasitology 96: 21-29. doi: 10.1645/GE-2123.1 PDF
2010 Freedman, A. H., Buermann, W, Mitchard, E. T. A., DeFries, R. S., and T. B. Smith. Human impacts flatten rainforest savanna gradient and reduce adaptive diversity in a rainforest bird. PLoS ONE 5: e13088. doi:10.1371/journal.pone.0013088. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.001308. PDF
2010 Freedman, A. H., Buermann, W, Mitchard, E. T. A., DeFries, R. S., and T. B. Smith. Human impacts flatten rainforest savanna gradient and reduce adaptive diversity in a rainforest bird. PLoS ONE 5: e13088. doi:10.1371/journal.pone.0013088. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0013088. PDF
2010 Freedman, A. H., H. A. Thomassen, W. Buermann, and T. B. Smith. Genomic signals of diversification along ecological gradients in a tropical lizard. Molecular Ecology 19: 3773-3788. PDF
2009 Njabo, K. Y., A. J. Cornel, R. N. M. Sehgal, C. Loiseau, W. Buermann, R.  J. Harrigan, J. Pollinger, G. Valkiūnas, and T. B. Smith. Coquillettidia (Culicidae, Diptera) mosquitoes as new natural vectors of avian malaria in Africa. Malaria Journal 8: 193. doi:10.1186/1475-2875-8-193. PDF
2009 Chasar, A., C. Loiseau, G, Valkiūnas, T. Iezhova, T. B. Smith, and R. N. M. Sehgal. Prevalence and diversity patterns of avian blood parasites in degraded African rainforest habitats. Molecular Ecology 18:  4121-4133. PDF
2009 Bonneaud, C, I. Sepil, B. Milá, W. Buermann, J. Pollinger, R. N. M. Sehgal, G. Valki?nas, T. A. Iezhova, S. Saatchi, and T. B. Smith. The prevalence of avian Plasmodium is higher in undisturbed tropical forests of Cameroon. Journal of Tropical Ecology 25: 439-447. PDF
2009 Valkiūnas G., T. A. Iezhova, C. Loiseau, A. Chasar, T. B. Smith, and R. N. M. Sehgal. New malaria parasites of the subgenus Novyella in African rainforest birds, with remarks on their high prevalence, classification and diagnostics. Parasitology Research 104: 1061-1077. PDF
2009 Kirschel, A. N. G., D. T. Blumstein, and T. B. Smith.  Character displacement of song and morphology in African tinkerbirds. Proceedings of the National Academy of Sciences 106: 8256-8261. PDF
2009 Kirschel, A. N. G., D. T. Blumstein, R. E. Cohen, W. Buermann, T. B. Smith, and H. Slabbekoorn. Birdsong tuned to the environment: green hylia song varies with elevation, tree cover, and noise. Behavioral Ecology 20: 1089-1095. PDF
2009 Freedman, A. H., W. Buermann, M. LeBreton, L. Chirio, and T. B. Smith. Modeling the effects of anthropogenic habitat change on savanna snake invasions into African rainforest. Conservation Biology 23: 81-92. PDF
2008 Valkiūnas G., T. A. Iezhova, C. Loiseau, A. Chasar, T. B. Smith, and R. N. M. Sehgal. New species of haemosporidian parasites (Haemosporida) from African rainforest birds, with remarks on their classification. Parasitology Research 103: 1213-1228. PDF
2008 Smith, T. B., and G. Grether. The importance of conserving evolutionary process. Pages 85-98. In S. P. Carroll and C. Fox (Eds.). Conservation Biology: Evolution in Action. Oxford University Press, Oxford.
2007 Wang, B. C., V. L. Sork, M. T. Leong, and T. B. Smith. Hunting of mammals affects seed removal and dispersal of the Afrotropical tree, Antrocaryon klaineanum (Anacardiaceae). Biotropica 39(3): 340-347. PDF
2005 Jones, H.I., R.N.M. Sehgal and T.B. Smith. Leucocytozoon (Apicomplexa: Leucocytozoide) from West African Birds, with descriptions of two species. Journal of Parasitology 29: 397-401. PDF
2005 Sehgal, R. N. M., H. I. Jones, and T. B. Smith. Molecular evidence for host specificity of parasitic nematode microfilariae in some African rainforest birds. Molecular Ecology 14: 3977-3988. PDF
2005 Sehgal, R. N. M., H. I. Jones, and T. B. Smith. Blood parasites of some West African rainforest birds. Journal of Veterinary Medical Science 67: 295-301. PDF
2005 Smith, T. B., R. K. Wayne, D. Girman, and M. W. Bruford. Evaluating the divergence-with-gene-flow model in natural population: the importance of ecotones in rainforest speciation. Pages 148-165. In E. Bermingham, C. Dick, and C. Moritz (Eds.). Tropical Rainforests: Past, Present, and Future. University of Chicago Press, Chicago. PDF
2005 Smith, T. B., S. Saatchi, C. Graham, H. Slabbekoorn, and G. Spicer. Putting process on the map: Why ecotones are important for preserving biodiversity. Pages 166-197. In A. Purvis, J. Gittleman, and T. Brooks (Eds.). Phylogeny and Conservation. Cambridge University Press, Cambridge, United Kingdom. PDF
2005 French, A., and T.B. Smith. Importance of body size in determining dominance hierarchies among diverse tropical frugivores. Biotropica 37: 95-100. PDF
2005 Clark, C. J., J. R. Poulsen, E.F. Connor, B. Bolker and V. T Parker. Comparative seed shadows of bird-, monkey, and wind-dispersed trees in a central African tropical rain forest.  Ecology 86:2684-2694.
2004 Clark, C. J., J. R. Poulsen, E. F. Connor and V. T. Parker.Fruiting trees as dispersal foci in a closed canopy tropical forest.  Oecologia 139: 66-75.
2004 Stauffer, D., and T. B. Smith. Breeding and nest site characteristics of the Black-casqued Ceratogymna atrata and White-thighed Ceratogymna cylindricus Hornbill in south-central Cameroon. Ostrich 75: 79-88. PDF
2003 Hardesty, B. D. and V. T. Parker.  Community seed rain patterns and a comparison to adult community structure in a West African tropical forest.  Plant Ecology 164: 49-64.
2002 Richard, F.A., R. N. M. Sehgal, H. I. Jones, and T. B. Smith. A Comparative Analysis of PCR-based Detection Methods for Avian Malaria, Journal of Parasitology 88: 819-822. PDF
2002 Slabbekoorn, H and T. B. Smith. Habitat-dependent song divergence in the little greenbul: an analysis of environmental selection pressures on acoustic signals. Evolution 56: 1849-1858. PDF
2002 Holbrook, K. M., T. B. Smith and B. D. Hardesty. Long-distance movements of frugivorous rainforest hornbills. Ecography 25: 745-749. PDF
2002 Poulsen, J. R., C. J. Clark, E. F. Conner and T. B. Smith. Differential resource use by primates and hornbills: implications for seed dispersal. Ecology 83: 228-240. PDF
2002 Wang, B. C. and T. B. Smith. Closing the seed dispersal loop. Trends in Ecology and Evolution 17: 379-386. PDF
2001 Poulsen, J. R., C. J. Clark, and T. B. Smith. Seed dispersal by a primate community in the Dja Reserve, Cameroon. Journal of Tropical Ecology 17: 787-808. PDF
2001 Clark, C. J., J. R. Poulsen, and V. T. Parker.  Frugivore impact on seed rain patterns in a central African tropical forest.  Biotropica 33: 606-620.
2001 Poulsen, J. R., C. J. Clark, and T. B. Smith. Seasonal variation in the feeding ecology of the grey-cheeked mangabey (Lophocebus albigena) in Cameroon. American Journal of Primatology 54: 91-105. PDF
2001 Sehgal, R. N. M., H. I. Jones and T. B. Smith. Host specificity and prevalence of Trypanosoma in the African avifauna: a molecular approach. Molecular Ecology. 10: 2319-2327. PDF
2000 Holbrook, K. M and T. B. Smith. Seed dispersal and movement patterns in two species of Ceratogymna hornbills in a West African tropical lowland forest. Oecologia 125: 249-257. PDF
1999 Schneider, C., T. B. Smith, B. Larison, and C. Moritz. 1999. A test of alternative models of diversification in tropical rainforest: ecological gradients vs. rainforest refugia. Proceedings of the National Academy of Sciences 96: 13869-13873. PDF
1998 Whitney, K., Fogiel, M., Lamperti, A., Holbrook, K., Stauffer, D., Hardesty, B., Parker, V. Smith, T. Seed dispersal by Ceratogymna hornbills in the Dja Reserve of Cameroon. Journal of Tropical Ecology 14: 351-371. PDF
1998 Whitney, K. and Smith, T. Habitat use and resource tracking by African Ceratogymna hornbills: implications for seed dispersal and forest conservation. Animal Conservation 1: 107-117. PDF
1997 Smith, T.B., R. K. Wayne, D. Girman and M. W. Bruford. A Role for Ecotones in Generating Rainforest Biodiversity. Science 276: 1855-1857. PDF

Theses

Freedman, A. 2009. Adaptive diversification and anthropogenic impacts on African rainforest biodiversity. PhD, University of California, Los Angeles, CA.
http://catalog.library.ucla.edu/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=First Call number W4C F8745a 2009

Chasar, A. 2009. Effects of deforestation on the prevalence and diversity of blood parasites in two African rainforest birds. MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 2009 BIOL .C437

Wang, B.C. 2008. Impacts of hunting on seed dispersal in a Central African tropical forest  PhD, University of California, Los Angeles, CA http://catalog.library.ucla.edu/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=FirstW4C Call number W18385i 2008 

Fogiel, M. 2007. An evaluation of fruit availability theory and measurement in an afrotropical rainforest. MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 2007 BIOL .F64  

Lamperti A. 2004. Aspects of the seed dispersal ecology of Ceratogymna hornbills in Central Africa. MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 2004 BIOL .L36  

Wang, B.C. 2004. Hornbills in a human-disturbed rainforest: seed dispersal, habitat suitability, and conservation MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 2004 BIOL .W36  

French, A. 2002. Aspects of foraging in a diverse tropical frugivore guild : behavioral and nutritional patterns MA, San Francisco State University,
San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call Number AS36 2002 BIOL .F74  

Clark C.J. 2001. Frugivore influence on patterns of seed rain, seed shadows, and forest structure. MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 2001 BIOL .C62  

Poulsen J. R. 2000. Resource use, seed dispersal, and feeding ecology of primates in Cameroon MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox Call number AS36 2000 BIOL .P68

Holbrook K. M. 1999. Seed dispersal movement patterns of Ceratogymna hornbills in Cameroon. MA thesis (Biology), San Francisco State University, San Francisco
http://www.library.sfsu.edu/#utilitybox  Call number AS36 1999 BIOL .H642  

Hardesty B.D. 1999. Seed Rain in a West African Tropical Forest. MA, San Francisco State University, San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 1999 BIOL .H372  

Whitney, K. D. 1996. Ecology of Ceratogymna Hornbills : seed dispersal, habitat use, and resource training MA, San Francisco State University,San Francisco, USA.
http://www.library.sfsu.edu/#utilitybox  Call number AS36 1996 BIOL .W447  

Report

ECOFAC Report — Dja Hornbill Project/Projet Calao, 1994-1998



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