Altitudinal variation and conservation priorities of vegetation along the Great Rift Valley escarpment, northern Ethiopia

Biodiversity and Conservation

Volumn 21, Issue 10, 2012, Pages 2691-2707

  Aynekulu, Ermias ^a,b   Aerts, Raf ^c   Moonen, Pieter ^c   Denich, Manfred ^d   Gebrehiwot, Kindeya ^b   Vågen, Tor Gunnar ^a   Mekuria, Wolde ^e   Boehmer, Hans Juergen ^f,g  

^a WORLD AGROFORESTRY CENTRE ICRAF   (Kenya)

^b MEKELLE UNIVERSITY   (Ethiopia)

^c UNIVERSITY OF LEUVEN   (Belgium)

^d UNIVERSITY OF BONN   (Germany)

^e International Water Management Institute IWMI   (Laos)

^f UNIVERSITY OF BONN   (Germany)

^g TECHNICAL UNIVERSITY OF MUNICH   (Germany)

Author keywords

Afromontane; Conservation; Diversity; Dracaena ombet; Elevation; Forest fragment; Plant community; Species richness

Indexed keywords

ALTITUDINAL ZONATION; ELEVATION; ENDANGERED SPECIES; ESCARPMENT; HABITAT CONSERVATION; HABITAT FRAGMENTATION; LAND USE CHANGE; PLANT COMMUNITY; SHRUB; SPECIES DIVERSITY; SPECIES RICHNESS; VASCULAR PLANT;

ETHIOPIA; KENYA; RIFT VALLEY;

ABUTILON; ACACIA; ACACIA ETBAICA; ACACIA MELLIFERA; CALPURNIA AUREA; CLUTIA; DRACAENA OMBET; JUNIPERUS; JUNIPERUS PROCERA; LANCEOLATA; TRACHEOPHYTA;

EID: 84865409231     PISSN: 09603115     EISSN: 15729710     Source Type: Journal    
DOI: 10.1007/s10531-012-0328-9     Document Type: Article

References (80)

1. Aerts R, van Overtveld K, Deckers J, Haile M, Hermy M, Muys B (2006) Species composition and diversity of small Afromontane forest fragments in northern Ethiopia. Plant Ecol 187: 127-142.
2. Aerts R, Lerouge F, November E, Lens I, Hermy M, Muys B (2008) Land rehabilitation and the conservation of birds in a degraded Afromontane landscape in northern Ethiopia. Biodivers Conserv 17: 53-69.
3. Aerts R, Hundera K, Berecha G, Gijbels P, Baeten M, van Mechelen M, Hermy M, Muys B, Honnay O (2011) Semi-forest coffee cultivation and the conservation of Ethiopian Afromontane rainforest fragments. For Ecol Manag 261: 1034-1041.
4. Aynekulu E, Kassawmar T, Tamene L (2008) Applicability of ASTER imagery in mapping land use/cover as a basis for biodiversity studies in drylands of northern Ethiopia. Afr J Ecol 46(Suppl. 1): 19-23.
5. Aynekulu E, Denich M, Tsegaye D (2009) Regeneration response of Juniperus procera and Olea europaea subsp. cuspidata to exclosure in a dry Afromontane forest in northern Ethiopia. Mt Res Dev 29: 143-152.
6. Aynekulu E, Denich M, Tsegaye D, Aerts R, Neuwirth B, Boehmer HJ (2011) Dieback affects forest structure in a dry Afromontane forest in northern Ethiopia. J Arid Environ 75: 499-503.
7. Blundo C, Malizia LR, Blake JG, Brown AD (2012) Tree species distribution in Andean forests: influence of regional and local factors. J Trop Ecol 28: 83-95.
8. Boehmer HJ (2011) Vulnerability of tropical montane rain forest ecosystems due to climate change. In: Brauch HG, Oswald Spring Ú, Mesjasz C, Grin J, Kameri-Mbote P, Chourou B, Dunay P, Birkmann J (eds) Coping with global environmental change, disasters and security-threats, challenges, vulnerabilities and risks. Hexagon series on human and environmental security and peace, vol 5, Springer, Berlin, 789-802. doi: 10. 1007/978-3-642-17776-7_46.
9. Bongers F, Poorter L, Hawthorne WD, Sheil D (2009) The intermediate disturbance hypothesis applies to tropical forests, but disturbance contributes little to tree diversity. Ecol Lett 12: 798-805.
10. Breshears DD, Cobb NS, Rich PM, Price KP, Allen CD, Balice RG, Romme WH, Kastens JH, Floyd ML, Belnap J, Anderson JJ, Myers OB, Weyer CW (2005) Regional vegetation die-off in response to global-change-type drought. Proc Natl Acad Sci USA 102: 15144-15148.
11. Brinkmann K, Patzelt A, Dickhoefer U, Schlecht E, Buerkert A (2009) Vegetation patterns and diversity along an altitudinal and a grazing gradient in the Jabal al Akhdar mountain range of northern Oman. J Arid Environ 73(11): 1035-1045.
12. Burgess ND, Butynski TM, Cordeiro NJ, Doggart N, Fjeldså J, Kilahama F, Loader SP, Lovett JC, Mbilinyi B, Menegon M, Moyer DC, Nashanda EA, Perkin A, Atanley WT, Stuart SN (2007) The biological importance of the eastern Arc mountains of Tanzania and Kenya. Biol Conserv 134: 209-231.
13. Clarke KR (1993) Non-parametric multivariate analyses of changes in community structure. Aust J Ecol 18: 117-143.
14. Conservation International (2007) Biodiversity hotspots [Online]. http://www. biodiversityhotspots. org/xp/Hotspots/hotspots_by_region/Pages/default. aspx. Accessed 09 April 2012.
15. Darbyshire I, Lamb H, Umer M (2003) Forest clearance and regrowth in northern Ethiopia during the last 3, 000 years. Holocene 13: 537-546.
16. Dudley N, Parish J (2006) Closing the gap. Creating ecologically representative protected area systems: a guide to conducting the gap assessments of protected area systems for the convention on biological diversity. Technical series No. 24. Secretariat of the Convention on Biological Diversity, Montreal, Canada.
17. Dufrêne M, Legendre P (1997) Species assemblages and indicator species: the need for a flexible asymmetrical approach. Ecol Monogr 67: 345-366.
18. Eilu G, Hafashimana DIN, Kasenene JM (2004) Density and species diversity of trees in four tropical forests of the Albertine rift, western Uganda. Divers Distrib 10: 303-312.
19. Ferrier S (2002) Mapping spatial pattern in biodiversity for regional conservation planning: where to from here? Syst Biol 51: 331-363.
20. Fjeldsa J (2007) How broad-scale studies of patterns and processes can guide conservation planning in Africa. Conserv Biol 21: 659-667.
21. Friis I (1986) The forest vegetation of Ethiopia. Acta Univ Ups Symb Ups XX1: 31-47.
22. Friis I (1992) Forests and forest trees of northeast tropical Africa: their natural habitats and distribution patterns in Ethiopia, Djibouti and Somalia. Her Majesty's Stationery Office, London.
23. Friis I, Demissew S (2001) Vegetation maps of Ethiopia and Eritrea. A review of existing maps and the need for a new map for the flora of Ethiopia and Eritrea. In: Friis IB, Ryding O (eds) Proceedings of the 3rd international symposium on the flora of Ethiopia and Eritrea at the Carlsberg Academy, Copenhagen. Biodiversity Research in the Horn of Africa Region, pp 399-439.
24. Friis I, Demissew S, van Breugel P (2010) Atlas of the potential vegetation of Ethiopia, Biologiske Skrifter, vol 58. The Royal Danish Academy of Science and Letters, Copenhagen.
25. Gebreegziabher Z (1999) Dessa'a protected area: an assessment of human impact, evolutionary pattern and options for sustainable management. UNESCO MAB (Man and the Biosphere).
26. Gole TW, Borsch T, Denich M, Teketay D (2008) Floristic composition and environmental factors characterizing coffee forests in southwest Ethiopia. For Ecol Manag 255: 2138-2150.
27. Greenway PJ (1973) A classification of the vegetation of east Africa. Kirkia 9: 1-68.
28. Grytnes JA, Beaman JH (2006) Elevational species richness patterns for vascular plants on Mount Kinabalu, Borneo. J Biogeogr 33: 1838-1849.
29. Haila Y, Margules CR (1996) Survey research in conservation biology. Ecography 19: 323-331.
30. Hedberg O (1969) Evolution and speciation in a tropical high mountain flora. Biol J Linn Soc Lond 1: 135-148.
31. Hemp A (2006) Continuum or zonation? Altitudinal gradients in the forest vegetation of Mt. Kilimanjaro. Plant Ecol 184: 27-42.
32. Hillebrand H, Bennett D, Cadotte MW (2008) Consequences of dominance: a review of evenness effects on local and regional ecosystem processes. Ecology 89(6): 1510-1520.
33. Huston M, Gilbert L (1996) Consumer diversity and secondary production. In: Orians GH, Dirzo R, Cushman JH (eds) Biodiversity and ecosystem processes in tropical forests. Springer, New York, pp 33-47.
34. Kassen R, Buckling A, Bell G, Rainey PB (2000) Diversity peaks at intermediate productivity in a laboratory microcosm. Nature 406: 507-512.
35. Kessler M (2000) Elevational gradients in species richness and endemism of selected plant groups in the central Bolivian Andes. Plant Ecol 149: 181-193.
36. Kreft H, Jetz W (2007) Global patterns and determinants of vascular plant diversity. Proc Natl Acad Sci USA 104: 5925-5930.
37. Kurschner H, Kilian N, Hein P (2008) The Tarchonantho camphoratae-Oleetum cuspidatae ass. nov.-an Afromontane evergreen sclerophyllous community of the Arabian peninsula with strong relationships to East Africa. Phytocoenologia 38: 85-106.
38. Laurance WF, Useche DC, Shoo LP, Herzog SK, Kessler M, Escobar F, Brehm G, Axmacher JC, Chen I-C, Gámez LA, Hietz P, Fiedler K, Pyrcz T, Jolf W, Merkord CL, Cardelus C, Marshall AR, Ah-Peng C, Aplet GH, Arizmendi MDC, Baker WJ, Barone J, Brühl, CA, Bussmann RW, Cicuzza D, Eilu G, Favila ME, Hemp A, Hemp C, Homeier J, Hurtado J, Jankowski J, Kattán G, Kluge J, Krömer T, Lees DC, Lehnert M, Longino JT, Lovett J, Martin PH, Patterson, BD, Pearson RG, Peh KS-H, Richardson B, Richardson M, Samways MJ, Senbeta F, Smith TB, Utteridge TMA, Watkins JE, Wilson R, Williams SE, Thomas CD (2011) Global warming, elevational ranges and the vulnerability of tropical biota. Biol Cons 144: 548-557.
39. Logan WEM (1946) An Introduction to the Forests of Central and Southern Ethiopia. Imperial Forestry Institute, University of Oxford, Oxford.
40. Lomolino MV (2001) Elevation gradients of species-density: historical and prospective views. Glob Ecol Biogeogr 10: 3-13.
41. Lovett JC (1988) Endemism and affinities of the Tanzanian montane forest flora. In: Goldblatt P, Lowry PP (eds) Proceedings of the eleventh plenary of the Association for the Taxonomic Study of Tropical Africa. Monographs in systematic botany from the Missouri botanical garden, vol 25, pp 591-598.
42. Lovett JC (1993) Temperate and tropical floras in the mountains of eastern Tanzania. Opera bot 121: 217-227.
43. Lovett JC (1999) Tanzanian forest tree plot diversity and elevation. J Trop Ecol 121: 217-227.
44. Lovett JC, Wasser SK (1993) Biogeography & ecology of the rainforest of eastern Africa. Cambridge University Press, Cambridge.
45. Lovett JC, Rudd S, Taplin J, Frimodt-moller C (2000) Patterns of plant diversity in Africa south of the Sahara and their implications for conservation management. Biodivers Conserv 9: 37-46.
46. Lyaruu HV, Eliapenda S, Backeus I (2000) Floristic, structural and seed bank diversity of a dry Afromontane forest at Mafai, central Tanzania. Biodivers Conserv 9: 241-263.
47. Margules CR, Pressey RL, Williams PH (2007) Representing biodiversity: data and procedures for identifying priority areas for conservation. J Biosci 27: 309-326.
48. Martin TG, Chade's I, Arcese P, Marra PP, Possingham HP, Ryan Norris D (2007) Optimal conservation of migratory species. PLoS ONE 2(8): e751.
49. McCune B, Grace JB (2002) Analysis of ecological communities. MjM Software Design, USA.
50. McCune B, Mefford MJ (1999) PC-ORD multivariate analysis of Ecological data. Version 5. 0. MjM software. Gleneden Beach, Oregon.
51. Mekuria W, Aynekulu E (2011) Exclosure land management restores soil properties of degraded communal grazing lands in northern Ethiopia. Land Degrad Dev. doi: 10. 1002/ldr. 1146.
52. Mittelbach GG, Steiner CF, Scheiner SM, Gross KL, Reynolds HL, Waide RB, Willing MR, Dodson SI, Gouch L (2001) What is the observed relationship between species richness and productivity? Ecology 82: 2381-2396.
53. Mittermeier RA, Myers N, Thomsen JB (1998) Biodiversity hotspots and major tropical wilderness areas: approaches to setting conservation priorities. Conserv Biol 12: 516-520.
54. Munro RN, Deckers J, Haile M, Grove AT, Poesen J, Nyssen J (2008) Soil landscapes, land cover change and erosion features of the central plateau region of Tigrai, Ethiopia: photo-monitoring with an interval of 30 years. CATENA 75: 55-64.
55. Mwaura F, Kaburu HM (2009) Spatial variability in woody species richness along altitudinal gradient in a lowland-dryland site, Lokapel Turkana, Kenya. Biodivers Conserv 18: 19-32.
56. Newmark WD (2002) Conserving biodiversity in east African forests: a study of the eastern Arc Mountains. Ecological studies, vol 155. Springer, Berlin.
57. Nogués-Bravo D, Araújo MB, Romdal T, Rahbek C (2008) Scale effects and human impact on the elevational species richness gradients. Nature 253: 216-219.
58. Nyssen J, Poesen J, Moeyersons J, Deckers J, Haile M, Lang A (2004) Human impact on the environment in the Ethiopian and Eritrean highlands-a state of the art. Earth Sci Rev 64: 273-320.
59. Oommen MA, Shanker K (2005) Elevational species richness patterns emerge from multiple local mechanisms in Himalayan woody plants. Ecology 86(11): 3039-3347.
60. Pichi-sermolli R (1957) Una carta geobotanica dell'Africa Orientale. Webbia 13: 15-132.
61. Rahbek C (1995) The elevational gradient of species richness: a uniform pattern? Ecography 18(2): 200-205.
62. Reid WV (1998) Biodiversity hotspots. Trends Ecol Evol 13: 275-280.
63. Ren H-B, Niu S-K, Zhang L-Y, Ma K-P (2006) Distribution of vascular plant species richness along an elevational gradient in the Dongling Mountains, Beijing, China. J Integr Plant Biol 48: 153-160.
64. Sánchez-gonzález A, López-mata L (2005) Plant species richness and diversity along an altitudinal gradient in the Sierra Nevada, Mexico. Divers Distrib 11: 567-575.
65. Schmitt CB, Denich M, Demissew S, Friis I, Boehmer HJ (2010) Floristic diversity in fragmented Afromontane rainforests: altitudinal variation and conservation importance. Appl Veg Sci 13: 291-304.
66. Senbeta F, Schmitt CB, Denich M, Demissew S, Vlek PLG, Preisinger H, Woldemariam T, Teketay D (2005) The diversity and distribution of lianas in the Afromontane rainforests of Ethiopia. Divers Distrib 11: 443-452.
67. Tikssa M, Bekele T, Kelbessa E (2010) Plant community distribution and variation along the Awash river corridor in the main Ethiopian rift. Afr J Ecol 48: 121-128.
68. Tsegaye D, Moe SR, Haile M (2009) Livestock browsing, not water limitations, contributes to recruitment failure of Dobera glabra in semiarid Ethiopia. Rangeland Ecol Manag 62(6): 540-549.
69. Tsegaye D, Moe SR, Vedeld PO, Aynekulu E (2010a) Land-use/cover dynamics in arid and semi-arid rangelands of northern Afar, Ethiopia. Agric Ecosyst Environ 139: 174-180.
70. Tsegaye D, Hail M, Moe SR (2010b) The effect of land use on the recruitment and population structure of the important food and fodder plant, Dobera glabra (Forssk.) Poir. in northern Afar, Ethiopia. J Arid Environ 74(9): 1074-1082.
71. Vázquez JAG, Givnish TJ (1998) Altitudinal gradients in tropical forest composition, structure, and diversity in the Sierra de Manantlán, Jalisco, México. J Ecol 86: 999-1020.
72. von Breitenbach F (1963) The indigenous trees of Ethiopia, 2nd edn. Ethiopian Forestry Association, Addis Ababa, Ethiopia, p 305.
73. Whittaker RJ, Willis KJ, Field R (2003) Climatic-energetic explanations of diversity: a macroscopic perspective. In: Blackburn TM, Gaston KJ (eds) Macroecology: concepts and consequences. Cambridge University Press, Cambridge, pp 107-129.
74. Wilson MV, Shmida A (1984) Measuring beta diversity with presence-absence data. J Ecol 12: 1055-1064.
75. Woldemariam T (2003) Vegetation of the Yayu forest in SW Ethiopia: impacts of human use and implications for in situ conservation of wild coffea arabica L. populations. Ecology and development Series No. 10. Center for Development Research, University of Bonn.
76. Woldewahid G, van Der Werf W, Sykora K, Abate T, Mostofa B, van Huis A (2007) Description of plant communities on the Red Sea coastal plain of Sudan. J Arid Environ 68(1): 113-331.
77. Woldu Z, Feoli E, Nigatu L (1989) Partitioning an elevation gradient of vegetation from southeastern Ethiopia by probabilistic methods. Vegetatio 81: 189-198.
78. World Conservation Monitoring Centre (1998) Dracaena ombet. In: IUCN 2011. IUCN red list of threatened species. version 2011. 2. www.iucnredlist.org. Accessed 09 April 2012.
79. Yirdaw E (2001) Diversity of naturally-regenerated native woody species in forest plantations in the Ethiopian highlands. New For 22(3): 159-177.
80. Zhao S, Fang J (2006) Patterns of species richness for vascular plants in China's nature reserves. Divers Distrib 12: 364-372.