Abstract
We have mapped the vegetational variability of the Endulen-Laetoli area of northern Tanzania based on the premise that heterogeneity at the landscape level is a function of differences in geology, soils and topography. Vegetation habitats have been described in relation to these factors, particularly soils and topography, and the effects of climate changes are estimated in relation to these other factors. We have made voucher collections of the plants in the Laetoli region, an area of about 250 km2, and we have recorded distributions of plants by habitat, climate, soil and topography. Vegetation structure has been measured in terms of canopy cover, species richness, and canopy height. Sixteen species associations and structural types have been identified within the study area, and these have been mapped at a scale of 1:120,000. The whole area has been much disturbed by human activity, with large areas of weed growth resulting from cultivation, burning and overgrazing. Results show that areas of low relief have soils with impeded drainage or seasonal waterlogging and dense Acacia drepanolobium woodland, low stature when disturbed by human action, high when not. Shallow brown soils on volcanic lavas have five woodland associations, two dominated by Acacia species, two by Combretum-Albizia species, while a fifth to the east on volcanic soils has a different woodland association with Croton-Dombeya-Albizia species. Elevated land to the east, also on volcanic soils, has two associations of montane-edge species, one with Croton-Celtis-Lepidotrichilia, and the other with Acacia lahai, grading into the eastern highlands montane forest at 2,750 m. Seasonal water channels flowing from east to west have three Acacia riverine woodland associations. Three deep valleys to the north of the area have dense riverine woodland with Celtis, Albizia, Euclea, Combretum, and Acacia spp. Emergence of springs at Endulen feed a perennial stream with closed gallery forest with Ficus-Croton-Lepidotrichilia. Finally, recent ash falls from Oldonyo Lengai have produced localized immature alkaline soils with calcrete formation and short grass vegetation. Projections of increased or decreased rainfall and how this may potentially have affected the different environments form the basis for predictions about vegetation and habitat change.
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References
Alemseged, Z., Spoor, F., Kimbel, W. H., Bobe, R., Geraads, D., Reed, D., & Wynn, G. (2006). A juvenile early hominin skeleton from Dikika, Ethiopia. Nature, 443, 296–301.
Anderson, G. D., & Herlocker, D. (1973). Soil factors affecting the distribution of the vegetation types and their utilization by wild animals in Ngorongoro crater, Tanzania. Journal of Ecology, 61, 627–651.
Anderson, G. D., & Talbot, L. M. (1976). Soil factors affecting the distribution of grassland types and their utilization by wild animals on the Serengeti plains, Tanganyika. Journal of Ecology, 53, 33–55.
Andrews, P. (1989). Palaeoecology of Laetoli. Journal of Human Evolution, 18, 173–181.
Andrews, P., & Bamford, M. (2007). Past and present vegetation ecology of Laetoli, Tanzania. Journal of Human Evolution, 58, 78–98.
Andrews, P., & O’Brien, E. M. (2000). Climate, vegetation and predictable gradients in mammal species richness in southern Africa. Journal of Zoology, 251, 205–231.
Andrews, P., Groves, C., & Horne, J. (1975). The ecology of the Tana River flood plain. Journal of the East African Natural History Society, 151, 1–31.
Beentje, H. (1994). Kenya trees, shrubs and lianas. Nairobi: Kenya National Museum.
Bishop, L. C., Plummer, T. W., Hertel, F., & Kovarovic, K. (2011). Paleoenvironments of Laetoli, Tanzania as determined by antelope habitat preferences. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 355–366). Dordrecht: Springer.
Boone, R. B., Thirgood, S. J., & Hopcroft, J. G. (2006). Serengeti wildebeest migratory patterns modeled from rainfall and new vegetation growth. Ecology, 87, 1987–1994.
Burtt, B. D. (1942). Burtt memorial supplement: some east african vegetation communities. Journal of Ecology, 30, 65–146.
Dale, I. R., & Greenway, P. J. (1961). Kenya trees and shrubs. Nairobi: Buchanan’s Kenya Estates.
De Wit, H. A. (1978). Soils and grassland types of the Serengeti Plain (Tanzania): Their distribution and interrelations. Ph.D. dissertation, Agricultural University of Wageningen, Wageningen.
Dublin, H. T. (1991). Dynamics of the Serengeti-Mara woodlands. Forest Conservation and History, 35, 169–178.
Field, R., O’Brien, E. M., & Whittaker, R. J. (2005). Global models for predicting the climatic potential for (tree-shrub) plant richness: Development and evaluation. Ecology, 86, 2263–2277.
Grunblatt, J., Ottichilo, W. K., & Sinange, R. K. (1989). A hierarchical approach to vegetation classification in Kenya. African Journal of Ecology, 27, 45–51.
Hawkins, B. A., Montoya, D., Rodriguez, M. A., Olalla-Tarraga, M. A., & Zavala, M. A. (2006). Global models for predicting woody plant richness from climate: Comment. Ecology, 87, 255–259.
Hay, R. L. (1976). Geology of the Olduvai Gorge. Berkeley: University of California.
Hay, R. L. (1987). Geology of the Laetolil Beds. In M. D. Leakey, & J. M. Harris (Eds.), Laetoli: A Pliocene site in northern Tanzania (pp. 23–61). Oxford: Clarendon.
Herlocker, D., & Dirschl, H. J. (1972). Vegetation of the Ngorongoro Conservation Area, Tanzania. Canadian Wildlife Services Report Series, 19, 1–39.
Hernesniemi, E., Giaourtsakis, I., Evans, A. R. & Fortelius, M. (2011). Rhinocerotidae. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Fossil hominins and the associated fauna, vol. 2, pp. 275–293). Dordrecht: Springer.
Jager, T. (1982). Soils of the Serengeti Woodlands, Tanzania. Ph.D. dissertation, Agricultural University of Wageningen, Wageningen.
Johanson, D., White, T., & Coppens, Y. (1978). A new species of the genus Australopithecus (Primates: Hominidae) from the Pliocene of eastern Africa. Kirtlandia, 28, 1–14.
Kaiser, T. M. (2011). Feeding ecology and niche partitioning of the Laetoli ungulate faunas. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 329–354). Dordrecht: Springer.
Kingston, J. D. (2011). Stable isotopic analyses of Laetoli fossil herbivores. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 293–328). Dordrecht: Springer.
Kingston, J. D., & Harrison, T. (2007). Isotopic dietary reconstructions of pliocene herbivores at Laetoli: Implications for early hominin paleoecology. Palaeogeography, Palaeoclimatology, Palaeoecology, 243, 272–306.
Kovarovic, K., & Andrews, P. (2011). Environmental change within the Laetoli fossiliferous sequence: vegetation catenas and bovid ecomorphology. In T. Harrison (Ed.), Paleontology and geology of Laetoli: Human evolution in context (Geology, geochronology, paleoecology and paleoenvironment, vol. 1, pp. 367–380). Dordrecht: Springer.
Lamprey, R. H., & Reid, R. S. (2004). Expansion of human settlement in Kenya’s Maasai Mara: What future for pastoralism and wildlife? Journal of Biogeography, 31, 997–1032.
Leakey, M. D., & Harris, J. M. (Eds.). (1987). Laetoli: A Pliocene site in northern Tanzania. Oxford: Clarendon.
Leakey, M. D., & Hay, R. (1979). Pliocene footprints in the Laetolil Beds at Laetoli, northern Tanzania. Nature, 278, 317–323.
Lind, E. M., & Morrison, M. E. S. (1974). East African vegetation. London: Longman.
Metzger, K. L., Coughenour, M. B., Reich, R. M., & Boone, R. B. (2005). Effects of seasonal grazing on plant species diversity and vegetation structure in a semi-arid ecosystem. Journal of Arid Environments, 61, 147–160.
Michelmore, A. P. G. (1939). Observations on tropical African grasslands. Journal of Ecology, 27, 282–312.
Musiba, C. M. (1999). Laetoli Pliocene paleoecology: A reanalysis via morphological and behavioral approaches. Ph.D. dissertation, University of Chicago, Chicago.
Norton-Griffiths, M., Herlocker, D., & Pennycuick, L. (1975). The patterns of rainfall in the Serengeti ecosystem, Tanzania. East African Wildlife Journal, 13, 347–375.
O’Brien, E. M. (1993). Climatic gradients in woody plant species richness: Towards an explanation based on an analysis of southern Africa’s woody flora. Journal of Biogeography, 20, 181–198.
O’Brien, E. M., & Peters, C. R. (1999). Climatic perspectives for Neogene environmental reconstructions. In J. Agusti, L. Rook, & P. J. Andrews (Eds.), Hominoid evolution and climatic change in Europe (The evolution of Neogene terrestrial ecosystems in Europe, vol. 1, pp. 53–78). Cambridge: Cambridge University.
O’Brien, E. M., Whittaker, R. J., & Fields, R. (1998). Climate and woody plant diversity in southern Africa: Relationships at species, genus and family levels. Ecography, 21, 495–509.
O’Brien, E. M., Whittaker, R. J., & Fields, R. (2000). Climatic gradients in woody plant (tree and shrub) diversity: Water-energy dynamics, residual variation, and topography. Oikos, 89, 588–600.
Pratt, D. J., Greenway, P. J., & Gwynne, M. D. (1966). A classification of east african rangeland. Journal of Applied Ecology, 3, 369–382.
Reed, K. E. (1997). Early hominid evolution and ecological change through the African Plio-Pleistocene. Journal of Human Evolution, 32, 289–322.
Retallack, G. J. (1990). Soils of the past: An introduction to Paleopedology. Boston: Unwin Hyman.
Schmidt, W. (1975). The vegetation of the northeastern Serengeti National Park, Tanzania. Phytocoenologia, 3, 30–82.
Sinclair, A. R. E., & Norton-Griffiths, M. (1979). Serengeti, dynamics of an ecosystem. Chicago: University of Chicago.
Stern, J. T., & Susman, R. L. (1983). The locomotor anatomy of Australopithecus afarensis. American Journal of Physical Anthropology, 60, 279–317.
Su, D. F., & Harrison, T. (2007). The paleoecology of the Upper Laetolil Beds at Laetoli. In R. Bobe, Z. Alemseged, & A.K. Behrensmeyer (Eds.), Hominin environments in the East African Pliocene: An assessment of the faunal evidence (pp. 277–311). Dordrecht: Springer.
Trapnell, C. G., & Griffiths, J. F. (1960). The rainfall–altitude relation and its ecological significance in Kenya. East African Agricultural Journal, 25, 207–213.
Watson, R. M. (1967). The population ecology of the wildebeest in the Serengeti. Ph.D. dissertation, University of Cambridge, Cambridge.
White, F. (1983). The Vegetation of Africa. Paris: AETFAT/UNESCO.
Woodward, F. I. (1987). Climate and plant distribution. Cambridge: Cambridge University.
Acknowledgements
We are grateful to Terry Harrison for his invitation to take part in his Laetoli expeditions and to William Mziray for loan of herbarium equipment and facilities for identifying the plant species. We have also profited from discussions with Rosa Albert, Raymonde Bonnefille, Charles Peters, Rob Blumenschine and Terry Harrison. Five reviewers have helped to improve the manuscript, and we thank them. This work was supported by NSF grants BCS-9903434 and BCS-0309513 (to Terry Harrison), a PAST (Palaeoanthropological Scientific Trust, South Africa) grant (to MB) and the Wenner-Gren Foundation for Anthropological Research (to PA).
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Andrews, P., Bamford, M.K., Njau, EF., Leliyo, G. (2011). The Ecology and Biogeography of the Endulen-Laetoli Area in Northern Tanzania. In: Harrison, T. (eds) Paleontology and Geology of Laetoli: Human Evolution in Context. Vertebrate Paleobiology and Paleoanthropology Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9956-3_8
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