A continental analysis of correlations between tree patterns in African savannas and human and environmental variables

Journal of Arid Environments

Volumn 75, Issue 8, 2011, Pages 724-733

  Groen, T A ^a   van Langevelde, F ^b   van de Vijver, C A D M ^b   de Raad, A L ^c   de Leeuw, J ^d   Prins, H H T ^b  

^a UNIVERSITY OF TWENTE   (Netherlands)

^b WAGENINGEN UNIVERSITY   (Netherlands)

^c DURHAM UNIVERSITY   (United Kingdom)

^d INTERNATIONAL LIVESTOCK RESEARCH INSTITUTE   (Kenya)

Author keywords

Abiotic conditions; Aerial photographs; Herbivory; Nearest neighbour; Precipitation; Savanna trees; Spatial pattern

Indexed keywords

AERIAL PHOTOGRAPH; ANTHROPOGENIC EFFECT; CATTLE; ENVIRONMENTAL FACTOR; HERBIVORY; HISTORICAL RECORD; NEAREST NEIGHBOR ANALYSIS; POPULATION DENSITY; PRECIPITATION INTENSITY; SAVANNA; SHEEP; STAND STRUCTURE; TERRESTRIAL ECOSYSTEM;

AFRICA;

BOS; CAPRA HIRCUS; OVIS ARIES;

EID: 79955717110     PISSN: 01401963     EISSN: 1095922X     Source Type: Journal    
DOI: 10.1016/j.jaridenv.2011.03.010     Document Type: Article

References (49)

1. Archer S. Have southern Texas savannas been converted to woodland in recent history?. Am. Nat. 1989, 134:545-561.
2. Archer S. Development and stability of grass/woody mosaics in a subtropical savanna parkland, Texas, U.S.A. J. Biogeogr. 1990, 17:453-462.
3. Archibald S., Roy D.P., Van Wilgen B.W., Scholes R.J. What limits fire? An examination of drivers of burnt area in Southern Africa. Global Change Biol. 2009, 15:613-630.
4. Batjes, N.H., 2005. ISRIC-WISE global data set of derived soil properties on a 0.5 by 0.5 degree gridVersion 3.0. Report number: 2005/08, ISRIC-World Soil Information.
5. Belsky A.J. Spatial and temporal landscape patterns in arid and semi-arid African savannas. Mosaic Landscapes and Ecological Processes 1993, 31-56. Chapman and Hall, London. L. Hansson, Fahrig, G. Merriam (Eds.).
6. Bond W.J., Van Wilgen B.W. Fire and Plants 1996, Chapman and Hall, London, 263 p.
7. Breebaart L., Bhikray R., O'connor T.G. Dietary overlap between Boer goats and indigenous browsers in a South African savanna. Afr. J. Range For. Sci. 2002, 19:13-20.
8. Brown J.R., Carter J. Spatial and temporal patterns of exotic shrub invasion in an Australian tropical grassland. Landscape Ecol. 1998, 13:93-102.
9. Bucini G., Hanan N.P. A continental-scale analysis of tree cover in African savannas. Global Ecol. Biogeogr. 2007, 16:593-605.
10. Carmona-Moreno C., Belward A., Malingreau J.-P., Hartley A., Garcia-Alegre M., Antonovskiy M., Buchshtaber V., Pivovarov V. Characterizing interannual variations in global fire calendar using data from Earth observing satellites. Global Change Biol. 2005, 11:1537-1555.
11. Caylor K.K., Shugart H.H., Dowty P.R., Smith T.M. Tree spacing along the Kalahari transect in southern Africa. J. Arid Environ. 2003, 54:281-296.
12. Chevan A., Sutherland M. Hierarchical partitioning. Am. Stat. 1991, 45:90-96.
13. Debuse V.J., House A.P.N., Taylor D.W., Swift S.A. Landscape structure influences tree density patterns in fragmented woodlands in semi-arid eastern Australia. Austral. Ecol. 2009, 34:621-635.
14. De Knegt H.J., Hengeveld G.M., Van Langevelde F., De Boer W.F., Kirkman K.P. Patch density determines movement patterns and foraging efficiency of large herbivores. Behav. Ecol. 2007, 10.1093/beheco/arm080.
15. De Knegt H.J., Groen T.A., Van De Vijver C.A.D.M., Prins H.H.T., Van Langevelde F. Herbivores as architects of savannas: inducing and modifying spatial vegetation patterning. Oikos 2008, 117:543-554.
16. Di Bella C.M., Jobbágy E.G., Paruelo J.M., Pinnock S. Continental fire density patterns in South America. Global Ecol. Biogeogr. 2006, 15:192-199.
17. FAO ClimPag Climate Impact on Agriculture Available from:. http://www.fao.org/nr/climpag/climate/index_en.asp%23anchor1.
18. FAO GeoNetwork Environmental and Natural Resources Available from:. http://www.fao.org/geonetwork/srv/en/main.home.
19. FAO GLiPHA Global Livestock Production and Health Atlas Available from:. http://kids.fao.org/glipha/.
20. FAO Forest product Yearbook 2007, Available from:. http://www.fao.org/docrep/012/i0750m/i0750m00.htm.
21. Govender N., Trollope W.S.W., Van Wilgen B.W. The effect of fire season, fire frequency, rainfall and management on fire intensity in savanna vegetation in South Africa. J. Appl. Ecol. 2006, 43:748-758.
22. Groen T.A., Van Langevelde F., Van De Vijver C.A.D.M., Govender N., Prins H.H.T. Soil clay content and fire frequency affect clustering in trees in South African savannas. J. Trop. Ecol. 2008, 24:269-279.
23. Higgins S.I., Bond W.J., Trollope W.S.W. Fire, resprouting and variability: a recipe for tree-grass coexistence in savanna. Journal of Ecology 2000, 88:213-229.
24. Jeltsch F., Milton S.J., Dean W.R.J., Van Rooyen N. Tree spacing and coexistence in semiarid savannas. J. Ecol. 1996, 84:583-595.
25. Jeltsch F., Milton S.J., Dean W.R.J., Van Rooyen N., Moloney K.A. Modelling the impact of small-scale heterogeneities o tree-grass coexistence in semi-arid savannas. J. Ecol. 1998, 86:780-793.
26. LandScan Global Population Database 2005, Available from:, Oak Ridge National Laboratory, Oak Ridge, TN. http://www.ornl.gov/landsc
27. Lejeune O., Couteron P., Lefever R. Short range co-operativity competing with long range inhibition explains vegetation patterns. Acta Oecologica 1999, 20:171-183.
28. McGarigal K., Marks B.J. Fragstats: Spatial Pattern Analysis Program for Quantifying Landscape Structure 1993, Forest Science Department, Oregon State University.
29. Mistry, J., 2000. World Savannas: Ecology and Human Use. Pearson Education, Edinburg, p. 344.
30. Quinn G.P., Keough M.J. Experimental Design and Data Analysis for Biologists 2002, Cambridge University Press, pp. 537.
31. Roques K.G., O'Connor T.G., Watkinson A.R. Dynamics of shrub encroachment in an African savanna: relative influence of fire, herbivory, rainfall and density dependence. J. Appl. Ecol. 2001, 38:268-280.
32. Sankaran M., Hanan N.P., Scholes R.J., et al. Determinants of woody cover in African savannas. Nature 2005, 438:846-849.
33. Schenk H.J., Jackson R.B. Rooting depth, lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems. J. Ecol. 2002, 90:480-494.
34. Scholes R.J., Archer S.R. Tree-grass interactions in savannas. Annu. Rev. Ecol. Syst. 1997, 28:517-544.
35. Shackleton S.E., Shackleton C.M., Netshiluvhi T.R., Geach B.S., Ballance A., Fairbanks D.H.K. Use patterns and value of savanna resources in three rural villages in South Africa. Econ. Bot. 2002, 56:30-146.
36. Sankaran M., Ratnam J., Hanan N. Woody cover in African savannas: the role of resourcs, fire and herbivory. Global Ecology and Biogeography 2008, 17:236-245.
37. Sinclair A.R.E. Equilibria in plant-herbivore interactions. Serengeti II: Dynamics, Management and Conservation of an Ecosystem 1995, 91-114. University of Chicago Press, Chicago. A.R.E. Sinclair, P. Arcese (Eds.).
38. Smith T.M., Goodman P.S. The effect of competition on the structure and dynamics of Acacia savannas in Southern Africa. J. Ecol. 1986, 74:1031-1044.
39. Sturges H. The choice of a class-interval. J. Am. Stat. Assoc. 1926, 21:65-66.
40. Trollope W.S.W. Fire in Savanna. Ecological Effects of Fire of Southern African Ecosystems 1984, 199-218. Springer Verlag, Berlin. P.D.V. Booysen, N.M. Tainton (Eds.).
41. Trollope W.S.W. Fire Effects in African Grasslands and Savannas 1998, University of Fort Hare, Department Livestock & Pasture Science.
42. Trollope W.S.W., De Ronde C., Geldenhuys C.J. Fire behaviour. Wildland Fire Management Handbook for Sub-Sahara Africa 2004, Global Fire Monitoring Center, Freiburg, 432 p. J.G. Goldammer, C. De Ronde (Eds.).
43. Van Auken O.W. Shrub invasions of North American semiarid grasslands. Annu. Rev. Ecol. Syst. 2000, 3:197-215.
44. Van Der Brink P.J., Ter Braak C.J.F. Multivariate analysis of stress in experimental ecosystems by principal response curves and similarity analysis. Aquat. Ecol. 1998, 32:163-178.
45. Van De Vijver, C.A.D.M., 1999. Fire and life in Tarangire. Effects of burning and herbivory on an East African savanna system. Dissertation, Wageningen University, Wageningen, The Netherlands.
46. Van Langevelde F., Van De Vijver C.A.D.M., Kumar L., et al. Effects of fire and herbivory on the stability of savanna ecosystems. Ecology 2003, 84:337-350.
47. Walker B.H., Noy-Meir I. Aspects of the stability and resilience of savanna ecosystems. Ecology of Tropical Savannas 1982, 556-590. Springer Verlag, Berlin. B.J. Huntley, B.H. Walker (Eds.).
48. Walker B.H., Ludwig D., Holling C.S., Peterman R.M. Stability of semi-arid savanna grazing systems. J. Ecol. 1981, 69:473-498.
49. Walsh C.J. Hier. Part: Hierarchical Partitioning. R Package Version 1.0-1 2004, Available from:. http://www.r-project.org.