Abstract
Rivers border the geographic distributions of primate taxa, but the extent to which the rivers are effective barriers is debated. We here provide the first statistically substantiated analysis of the role of rivers as barriers to the distribution of primates in west and central Africa, as judged by the coincidence of the edge of distributions of forest-dwelling primates with rivers. We use data from the literature to analyze the distributions of 14 genera, 44 species, and 77 subspecies around 18 rivers, river groups, or stretches of rivers. Rivers bordered the distributions of more new taxa (subspecies) than of old taxa (genera), although within genera, age of origin of the taxon did not correlate with likelihood of rivers bordering distributions. Fewer taxa crossed wide rivers than crossed narrow ones. Some analyses indicated that more smaller-bodied genera were stopped by smaller rivers than were larger-bodied genera, but other analyses indicated no effect of body size. Genera with smaller geographic ranges crossed a smaller proportion of the rivers that they met than did genera with large ranges, implying a fundamental difference between small- and large-range taxa in their ability to disperse. Specialization might be the operating trait. Finally, although the aridity of the biogeographic gap in west Africa, the Dahomey Gap, is often argued to be the barrier to movement of species across the Gap, we found that for half the primate species that do not cross the Gap, the rivers that border the Gap could in fact be the effective barrier.
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Abegg, C., & Thierry, B. (2002). Macaque evolution and dispersal in insular south-east Asia. Biological Journal of the Linnean Society, 75, 555–576.
Ayres, J. M., & Clutton-Brock, T. H. (1992). River boundaries and species range size in Amazonian primates. The American Naturalist, 140, 531–537.
Barbujani, G., & Sokal, R. R. (1990). Zones of sharp genetic change in Europe are also linguistic boundaries. Proceedings of the National Academy of Sciences of the USA, 87, 1816–1819.
Booth, A. H. (1958). The Niger, the Volta, and the Dahomey Gap as geographic barriers. Evolution, 12, 48–62.
Campbell, G., Teichrob, J., & Paterson, J. D. (2008). Distribution of diurnal primate species in Togo and Bénin. Folia Primatologica, 79, 15–30.
Colyn, M. M. (1988). Distribution of guenons in the Zaïre-Lualaba-Lomami river system. In A. Gautier-Hion, F. Bourlière, & J.-P. Gautier (Eds.), A primate radiation: Evolutionary biology of the African guenons (pp. 104–124). Cambridge, UK: Cambridge University Press.
Conroy, G. C. (2003). The inverse relationship between species diversity and body mass: Do primates play by the "rules"? Journal of Human Evolution, 45, 43–55.
da Silva, M. N. F., & Patton, J. L. (1998). Molecular phylogeography and the evolution and conservation of Amazonian mammals. Molecular Ecology, 7, 475–486.
Diamond, J. M. (1975). Assembly of species communities. In M. L. Cody & J. M. Diamond (Eds.), Ecology and evolution of communities (pp. 343–444). Cambridge, MA: Harvard University Press.
Dupont, L. M., & Weinelt, M. (1996). Vegetation history of the savanna corridor between the Guinean and the Congolian rain forest during the last 150,000 years. Vegetation History and Archaeobotany, 5, 273–292.
Fuentes, A., & Wolfe, L. D. (Eds.). (2002). Primates face to face: The conservation implications of human–nonhuman primate interconnections. Cambridge, MA: Cambridge University Press.
Gascon, C., Malcolm, J. R., Patton, J. L., da Silva, M. N. F., Bogart, J. P., Lougheed, S. C., Peres, C. A., Neckel, S., & Boag, P. T. (2000). Riverine barriers and the geographic distribution of Amazonian species. Proceedings of the National Academy of Sciences of the USA, 97, 13672–13677.
Gautier-Hion, A., Colyn, M., & Gautier, J. P. (1999). Histoire naturelle des primates d'Afrique Centrale. Libreville, Gabon: ECOFAC.
Goodman, S. M., & Ganzhorn, J. U. (2004). Biogeography of lemurs in the humid forests of Madagascar: The role of elevational distribution and rivers. Journal of Biogeography, 31, 47–55.
Groves, C. P. (2001). Primate taxonomy. Washington, DC: Smithsonian Institution Press.
Grubb, P. (1990). Primate geography in the Afro-tropical rain forest biome. In G. Peters & R. Hutterer (Eds.), Vertebrates in the tropics (pp. 187–214). Bonn: Alexander Koenig Zoological Research Institute and Zoological Museum.
Happold, D. C. D. (1987). The mammals of Nigeria. Oxford: Clarendon Press.
Harcourt, A. H. (2000). Latitude and latitudinal extent: A global analysis of the Rapoport effect in a tropical mammalian taxon: primates. Journal of Biogeography, 27, 1169–1182.
Harcourt, A. H., Coppeto, S. A., & Parks, S. A. (2002). Rarity, specialization and extinction in primates. Journal of Biogeography, 29, 445–456.
Harcourt, A. H., Coppeto, S. A., & Parks, S. A. (2005). The distribution-abundance (i.e. density) relationship: Its form and causes in a tropical mammal order, Primates. Journal of Biogeography, 32, 565–579.
Heaney, L. R. (1986). Biogeography of mammals in southeast Asia: Estimates of rates of colonization, extinction and speciation. Biological Journal of the Linnean Society, 28, 127–166.
Hershkovitz, P. (1977). Living New World monkeys (Platyrrhini) (Vol. 1). Chicago: University of Chicago Press.
Houle, A. (1998). Floating islands: A mode of long-distance dispersal for small and medium-sized terrestrial vertebrates. Diversity and Distributions, 4, 201–216.
Kingdon, J. (1989). Island Africa: The evolution of Africa's rare animals and plants. Princeton, NJ: Princeton University Press.
Lernould, J.-M. (1988). Classification and geographical distribution of guenons: A review. In A. Gautier-Hion, F. Bourlière, & J.-P. Gautier (Eds.), A primate radiation: Evolutionary biology of the African guenons (pp. 54–78). Cambridge, UK: Cambridge University Press.
Maudlin, I. (2006). African trypanosomiasis. Annals of Tropical Medicine and Parasitology, 100, 679–701.
Meijaard, E., & Groves, C. P. (2006). The geography of mammals and rivers in mainland southeast Asia. In S. M. Lehman & J. G. Fleagle (Eds.), Primate biogeography (pp. 305–329). New York: Springer.
Meijaard, E., & Nijman, V. (2003). Primate hotspots on Borneo: Predictive value for general biodiversity and the effects of taxonomy. Conservation Biology, 17, 725–732.
Nobime, G., Sinsin, B., & Lernould, J.-M. (2009). Ecological factors determining the distribution of the red-bellied guenon Cercopithecus e. erythrogaster in Benin and Togo. International Journal of Biological and Chemical Sciences, 3, 606–611.
Oates, J. F. (1988). The distribution of Cercopithecus monkeys in West African forests. In A. Gautier-Hion, F. Bourlière, & J.-P. Gautier (Eds.), A primate radiation: Evolutionary biology of the African guenons (pp. 79–103). Cambridge, UK: Cambridge University Press.
Purvis, A. (1995). A composite estimate of primate phylogeny. Philosophical Transactions of the Royal Society of London B: Biological Sciences, 348, 405–421.
Salzmann, U., & Hoelzmann, P. (2005). The Dahomey Gap: An abrupt climatically induced rain forest fragmentation in West Africa during the late Holocene. The Holocene, 15, 190–199.
SAS Institute Inc. (2009). JMP 8.0. Cary, North Carolina: SAS Institute Inc.
Stouffer, P. C., Strong, C., & Naka, L. N. (2009). Twenty years of understorey bird extinctions from Amazonian rain forest fragments: Consistent trends and landscape-mediated dynamics. Diversity and Distributions, 15, 88–97.
Tattersall, I. (2006). Historical biogeography of the strepsirhine primates of Madagascar. Folia Primatologica, 77, 477–487.
Telfer, P. T., Souquiere, S., Clifford, S. L., Abernethy, K. A., Bruford, M. W., Disotell, D. R., Sterner, K. N., Roques, P., Marx, P. A., & Wickings, E. J. (2003). Molecular evidence for deep phylogenetic divergence in Mandrillus sphinx. Molecular Ecology, 12, 2019–2024.
Turner, I. M. (1996). Species loss in fragments of tropical rain forest: A review of the evidence. Journal of Applied Ecology, 33, 200–209.
Wallace, A. R. (1876). The geographical distribution of animals (Vol. I). New York: Harper and Bros.
Wallace, A. R. (1880). Island life. London: Macmillan.
Wolfheim, J. H. (1983). Primates of the world: Distribution, abundance and conservation. Seattle: University of Washington Press.
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We thank Lydia Beaudrot, John Oates, Joanna Setchell, Kelly Stewart, and an anonymous referee for critical commentary that markedly improved the paper.
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Harcourt, A.H., Wood, M.A. Rivers as Barriers to Primate Distributions in Africa. Int J Primatol 33, 168–183 (2012). https://doi.org/10.1007/s10764-011-9558-z
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DOI: https://doi.org/10.1007/s10764-011-9558-z