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Spatial patterns of tree recruitment in East African tropical forests that have lost their vertebrate seed dispersers

Published online by Cambridge University Press:  29 January 2010

Fred Babweteera  and
Nick Brown
Fred Babweteera*
Affiliation:
Budongo Conservation Field Station, P.O. Box 362, Masindi, Uganda
Nick Brown
Affiliation:
Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
*
1Corresponding author. Email: [email protected]
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Abstract:

The direct removal of adult trees by logging affects tree recruitment in tropical rain forests. However, secondary effects of logging, such as loss of vertebrate seed dispersers may also affect tree recruitment. We studied the recruitment and spatial distribution of five tree species namely Balanites wilsoniana, Celtis zenkeri, Chrysophyllum albidum, Cordia millenii and Ricinodendron heudelotii in Kibale, Budongo and Mabira Forests in Uganda. These forests have been subjected to varying degrees of disturbance leading to changes in their vertebrate seed dispersers. Vertebrate frugivores of the five tree species were identified. Three 1-ha plots were established around adult trees of the same five species in each forest and the distance from the juveniles to the nearest adult conspecific was measured to generate a recruitment curve. Frugivore visitation rates were high in the less disturbed Budongo and Kibale (2.2 and 1.6 individuals h−1 respectively) compared with the highly disturbed Mabira (0.9 individuals h−1). In the frugivore-impoverished forest, 70–90% of juveniles established beneath adult conspecifics, whereas in the less-disturbed forests juveniles were established up to 80 m from adult conspecifics. Shade-tolerant species capable of recruiting beneath adult conspecifics appeared to maintain their populations without dispersal. Consequently, disturbances leading to significant loss of vertebrates may alter tree recruitment and spatial distribution with consequences for long-term population viability of shade-intolerant tropical trees.

Keywords

Balanites wilsonianaCeltis zenkeriChrysophyllum albidumclumpedCordia milleniidensitydispersaldisturbancepredationRicinodendron heudelotii
Type
Research Article
Information
Journal of Tropical Ecology , Volume 26 , Issue 2 , March 2010 , pp. 193 - 203
Copyright
Copyright © Cambridge University Press 2010

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References

LITERATURE CITED

ARATRAKORN, S., THUNHIKORN, S. & DONALD, P. F. 2006. Changes in bird communities following conversion of lowland forest to oil palm and rubber plantations in southern Thailand. Bird Conservation International 16:71–82.CrossRefGoogle Scholar
BABWETEERA, F., SAVILL, P. & BROWN, N. 2007. Balanites wilsoniana: regeneration with and without elephants. Biological Conservation 134:40–47.Google Scholar
BALCOMB, S. R. & CHAPMAN, C. A. 2003. Bridging the gap: influence of seed deposition on seedling recruitment in a primate–tree interaction. Ecological Monographs 73:625–642.Google Scholar
BARLOW, J. & PERES, C. A. 2006. Effects of single and recurrent wildfires on fruit production and large vertebrate abundance in a central Amazonian forest. Biodiversity and Conservation 15:985–1012.Google Scholar
BAS, J. M., PONS, P. & GOMEZ, C. 2006. Exclusive frugivory and seed dispersal of Rhamnus alaternus in the bird breeding season. Plant Ecology 183:77–89.CrossRefGoogle Scholar
BASUTA, I. G. & KASENENE, J. M. 1987. Small rodent populations in selectively felled and mature tracts of Kibale Forest, Uganda. Biotropica 19:260–266.CrossRefGoogle Scholar
BAWA, K. S. & SEIDLER, R. 1998. Natural forest management and conservation of biodiversity in tropical forests. Conservation Biology 12:46–55.Google Scholar
CARBONE, C., CHRISTIE, S., CONFORTI, K., COULSON, T., FRANKLIN, N., GINSBERG, J. R., GRIFFITHS, M., HOLDEN, J., KAWANISHI, K., KINNAIRD, M., LAIDLAW, R., LYNAM, A., MACDONALD, D. W., MARTYR, D., MCDOUGAL, C., NATH, L., O'BRIEN, T., SEIDENSTICKER, J., SMITH, D. J. L., SUNQUIST, M., TILSON, R. & SHAHRUDDIN, W. N. W. 2001. The use of photographic rates to estimate densities of tigers and other cryptic mammals. Animal Conservation 4:75–79.Google Scholar
CHAPMAN, L. J., CHAPMAN, C. A. & WRANGHAM, R. W. 1992. Balanites wilsoniana – elephant dependent dispersal. Journal of Tropical Ecology 8:275–283.Google Scholar
COCHRANE, E. P. 2003. The need to be eaten: Balanites wilsoniana with and without elephant seed-dispersal. Journal of Tropical Ecology 19:579–589.Google Scholar
CORLETT, R. T. 1996. Characteristics of vertebrate-dispersed fruits in Hong Kong. Journal of Tropical Ecology 12:819–833.CrossRefGoogle Scholar
DA SILVA, J. M. C. & TABARELLI, M. 2000. Tree species impoverishment and the future flora of the Atlantic forest of northeast Brazil. Nature 404:72–74.Google Scholar
DIRZO, R., MENDOZA, E. & ORTIZ, P. 2007. Size-related differential seed predation in a heavily defaunated Neotropical rain forest. Biotropica 39:355–362.CrossRefGoogle Scholar
FEER, F. 1995. Seed dispersal in African forest ruminants. Journal of Tropical Ecology 11:683–689.CrossRefGoogle Scholar
FENNER, M. & THOMPSON, K. 2005. The ecology of seeds. Cambridge University Press, Cambridge. 250 pp.CrossRefGoogle Scholar
FORGET, P. M. 1990. Seed-dispersal of Vouacapoua americana (Caesalpiniaceae) by caviomorph rodents in French Guiana. Journal of Tropical Ecology 6:459–468.CrossRefGoogle Scholar
FRY, C. H. & KEITH, S. 2004. The birds of Africa Vol. VII. Christopher Helm, London. 666 pp.Google Scholar
FRY, C. H., KEITH, S. & URBAN, E. K. 1988. The birds of Africa Vol. III. Academic Press, London. 611 pp.Google Scholar
FRY, C. H., KEITH, S. & URBAN, E. K. 2000. The birds of Africa Vol. VI. Academic Press, London. 706 pp.Google Scholar
GAUTIER-HION, A., DUPLANTIER, J. M., QURIS, R., FEER, F., SOURD, C., DECOUX, J. P., DUBOST, G., EMMONS, L., ERARD, C., HECKETSWEILER, P., MOUNGAZI, A., ROUSSILHON, C. & THIOLLAY, J. M. 1985. Fruit characters as a basis of fruit choice and seed dispersal in a tropical forest vertebrate community. Oecologia 65:324–337.CrossRefGoogle Scholar
GITHIRU, M., LENS, L., BENNUR, L. A. & OGOL, C. 2002. Effects of site and fruit size on the composition of avian frugivore assemblages in a fragmented Afrotropical forest. Oikos 96:320–330.CrossRefGoogle Scholar
HAMILL, D. N. & WRIGHT, S. J. 1986. Testing the dispersion of juveniles relative to adults – a new analytic method. Ecology 67:952–957.Google Scholar
HAMILTON, A. 1991. A field guide to Uganda forest trees. Makerere University Printers, Kampala. 269 pp.Google Scholar
HARDESTY, B. D., HUBBELL, S. P. & BERMINGHAM, E. 2006. Genetic evidence of frequent long-distance recruitment in a vertebrate-dispersed tree. Ecology Letters 9:516–525.CrossRefGoogle Scholar
HOWARD, P. C. 1991. Nature conservation in Uganda's tropical forest reserves. IUCN, Gland. 313 pp.Google Scholar
HOWE, H. F. & MIRITI, M. N. 2000. No question: seed dispersal matters. Trends in Ecology and Evolution 15:434–436.Google Scholar
KAPLIN, B. A. & MOERMOND, T. C. 1998. Variation in seed handling by two species of forest monkeys in Rwanda. American Journal of Primatology 45:83–101.Google Scholar
KEITH, S., URBAN, E. K. & FRY, C. H. 1992. The birds of Africa Vol. IV. Academic Press, London. 609 pp.Google Scholar
KINGDON, J. 1997. The Kingdon guide to African mammals. Academic Press, London. 450 pp.Google Scholar
LAMBERT, J. E. 2000. The fate of seeds dispersed by African apes and cercopithecines. American Journal of Physical Anthropology 111:204–204.Google Scholar
LAURANCE, W. F., ALONSO, A., LEE, M. & CAMPBELL, P. 2006. Challenges for forest conservation in Gabon, central Africa. Futures 38:454–470.Google Scholar
MCCONKEY, K. R. 2000. Primary seed shadow generated by Gibbons in the rain forests of Barito Ulu, central Borneo. American Journal of Primatology 52:13–29.Google Scholar
PEET, R. K. & CHRISTENSEN, N. L. 1987. Competition and tree death. Bioscience 37:586–595.CrossRefGoogle Scholar
PEREIRA, R., ZWEEDE, J., ASNER, G. P. & KELLER, M. 2002. Forest canopy damage and recovery in reduced-impact and conventional selective logging in eastern Para, Brazil. Forest Ecology and Management 168:77–89.Google Scholar
PERES, C. A. 2001. Synergistic effects of subsistence hunting and habitat fragmentation on Amazonian forest vertebrates. Conservation Biology 15:1490–1505.Google Scholar
PLUMPTRE, A. & COX, D. 2006. Counting primates for conservation: primate surveys in Uganda. Primates 47:65–73.Google Scholar
PLUMPTRE, A., REYNOLDS, V. & BAKUNEETA, C. 1994. The contribution of fruit eating primates to seed dispersal and natural regeneration after selective logging. Budongo Forest Project, Oxford. 101 pp.Google Scholar
SILVEIRA, L., JACOMO, A. T. A. & DINIZ-FILHO, J. A. F. 2003. Camera trap, line transect census and track surveys: a comparative evaluation. Biological Conservation 114:351–355.Google Scholar
STANFORD, A. 2000. Rodent ecology and seed predation in logged and unlogged forest, Uganda. PhD thesis, School of Biological Sciences. University of Bristol, Bristol. 171 pp.Google Scholar
STONER, K. E., RIBA-HERNANDEZ, P., VULINEC, K. & LAMBERT, J. E. 2007. The role of mammals in creating and modifying seed shadows in tropical forests and some possible consequences of their elimination. Biotropica 39:316–327.Google Scholar
STRUHSAKER, T. T. 2008. Long-term research and conservation in Kibale National Park. Pp. 27–37 in Wrangham, R. & Ross, E. (eds.). Science and conservation in African forests: the benefits of long-term research. Cambridge University Press, Cambridge.CrossRefGoogle Scholar
SYNNOTT, T. J. 1985. A checklist of the flora of Budongo Forest Reserve, Uganda with notes on ecology and phenology. Commonwealth Forestry Institute Occasional papers No. 27. Oxford Forestry Institute, Oxford.Google Scholar
TAYLOR, C. J. 1960. Synecology and silviculture in Ghana. Thomas Nelson and Sons Ltd, London. 418 pp.Google Scholar
TERBORGH, J., PITMAN, N., SILMAN, M., SCHICHTER, H. & NUNEZ, P. V. 2002. Maintenance of tree diversity in tropical forests. Pp. 1–17 in Levey, D. J., Silva, W. R. & Galetti, M. (eds.). Seed dispersal and frugivory: ecology, evolution and conservation. CABI, Wallingford.Google Scholar
URBAN, E. K., FRY, C. H. & KEITH, S. 1986. The birds of Africa Vol. II. Academic Press, London. 552 pp.Google Scholar
URBAN, E. K., FRY, C. H. & KEITH, S. 1997. The birds of Africa Vol. V. Academic Press, London. 669 pp.Google Scholar
WESTMAN, W. E., STRONG, L. L. & WILCO, B. A. 1989. Tropical deforestation and species endangerment: the role of remote sensing. Landscape Ecology 3:97–109.Google Scholar
WHITE, L. J. T. 1994. The effects of commercial mechanized selective logging on a transect in lowland rainforest in the Lope-Reserve, Gabon. Journal of Tropical Ecology 10:313–322.Google Scholar
WRANGHAM, R. W., CHAPMAN, C. A. & CHAPMAN, L. J. 1994. Seed dispersal by forest chimpanzees in Uganda. Journal of Tropical Ecology 10:355–368.Google Scholar
WRIGHT, S. J. & MULLER-LANDAU, H. C. 2006. The future of tropical forest species. Biotropica 38:287–301.CrossRefGoogle Scholar