Biodiversity & Conservation

, Volume 10, Issue 11, pp 1809–1829

Land-snail faunas in indigenous rainforest and commercial forestry plantations in Kakamega Forest, western Kenya

  • Peter Tattersfield
  • Mary B. Seddon
  • Charles N. Lange


We examine the diversity and structure of land-snail faunas in indigenous rainforest communities and three types of forestry plantation in Kakamega Forest, western Kenya. Using plot-based, standardized sampling consisting of fixed-time direct searching and fixed-volume litter sieving we estimated molluscan diversity and abundance in monoculture plantation plots of the exotic, non-African tree species Bischofia javanica and Pinus spp., and the central African tree Maesopsis eminii which is an indigenous component of the Kakamega rainforest. Overall, 41, 39, 41 and 34 mollusc species were recorded in indigenous forest, Maesopsis, Bischofia and Pinus plantations respectively. The mean number of species and mean number of specimens per plot were 15–49% and 6–54% lower respectively in the plantations relative to indigenous forest. Abundance and species number were suppressed the most in the Pinus stands, and the least in the plantations of indigenous Maesopsis. Species per plot, Shannon index and abundance were lowest in the Pinus plantation and highest in the indigenous forest. Snails were more abundant in Maesopsis than in Bischofia, but mean species per plot and total species number did not differ significantly between these plantation types. Shannon evenness indices showed that the indigenous forest faunas were more uniform in terms of species abundance, whereas the three plantation types were dominated by a small number of species. Several species were confined to the indigenous rain forest. Although most species were present in both indigenous forest and plantations, many species were significantly more abundant in the rainforest communities. The potential use of groups of these species as indicators of forest conditions is discussed. Overall, the Maesopsis and Bischofia plantations support a substantial proportion of the indigenous rainforest's mollusc fauna. This maybe partly because of the relatively close proximity of indigenous stands to plantations, which can facilitate recolonisation. However, the finding illustrates that plantations hold the potential, at least in some circumstances, to provide alternative habitats for forest molluscs where indigenous rainforest has been cleared.

biodiversity forestry plantations Kenya land-snails rainforest 


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  1. Belshaw R andBolton B (1993) The effect of forest disturbance on the leaf-litter ant fauna in Ghana. Biodiversity and Conservation 2: (pp 656-666)Google Scholar
  2. Binggeli P andHamilton AC (1993) Biological invasion by Maesopsis eminii in the East Usambara forests, Tanzania. Opera Botanica 121: 229-235Google Scholar
  3. Burgess ND,Clarke GP andRodgers WA (1998) Coastal forests of eastern Africa: status, endemism patterns and their potential causes. Biological Journal of the Linnean Society 64: 337-367Google Scholar
  4. Cain AJ andCowie RH (1978) Activity of different species of land-snail on surfaces of different inclinations. Journal of Conchology, London 29: 267-272Google Scholar
  5. Cameron RAD (1978a) Differences in the sites of activity of co-existing species of land mollusc. Journal of Conchology, London 29: 273-278Google Scholar
  6. Cameron RAD (1978b) Terrestrial snail faunas of the Malham area. Field Studies 4: 715-728Google Scholar
  7. Cameron RAD (1986) Environment and diversities of forest snail faunas from coastal British Columbia. Malacologia 27: 341-355Google Scholar
  8. Chey VK (1994) Comparison of biodiversity between plantation and natural forests in Sabah using moths as indicators. PhD thesis, University of OxfordGoogle Scholar
  9. Chey VK,Holloway JD,Hambler C andSpeight MR (1998) Canopy knockdown of arthropods in exotic and natural forest in Sabah, north-east Borneo, using insecticidal mist-blowing. Bulletin of Entomological Research 88: 15-24Google Scholar
  10. De Winter AJ andvan Bruggen AC (1992) Systematic position and distribution of the land snails Afropunctum seminium (Morelet) and 'Guppya' rumurutiensis (Preston) (Mollusca, Gastropoda, Pulmonata: Euconulidae), with the description of two new taxa. Proceedings Koninklijke Nederlandse Akademie van Wetenschappen 95(4): 515-533Google Scholar
  11. De Winter AJ andGittenberger E (1998) The land snail fauna of a square kilometer of rainforest in southwestern Cameroon: high species richness, low abundance and seasonal fluctuations. Malacologia 40: 231-250Google Scholar
  12. Emberton KC (1995) On the endangered biodiversity of Madagascan land snails. In: van Bruggen AC,Wells SM andKemperman ThCM (eds) Biodiversity and Conservation of the Mollusca, pp 69-89. Backhuys, Leiden, The NetherlandsGoogle Scholar
  13. Emberton KC,Pearce TA,Kasigwa PF,Tattersfield P andHabibu Z (1997). High diversity and regional endemism in land snails of eastern Tanzania. Biodiversity and Conservation 6(8): 1123-1136Google Scholar
  14. Faden RB (1970) A preliminary report on the Kakamega Forest in Kenya. Unpublished report from the East African Herbarium, Nairobi, KenyaGoogle Scholar
  15. Germain L (1923)Voyage de M. Guy Babault dans L'Afrique orientale anglaise. Resultats scientifique. Mollusques terrestres et fluviatiles. ParisGoogle Scholar
  16. Grieser Johns A (1997) Timber Production and Biodiversity Conservation in Tropical Rain Forests. Cambridge University Press, CambridgeGoogle Scholar
  17. Hanski I andKrikken J (1991) Dung beetles in tropical forests in South-east Asia. In: Hanski I andCambefort Y (eds) Dung Beetle Ecology, pp 179-197. Princeton University Press, New JerseyGoogle Scholar
  18. Holloway JD,Kirk-Spriggs AH andChey VK (1992) The response of some rain forest groups to logging and conversion to plantation. In: Marshall AG andSwaine MD (eds) Tropical Rain Forest: Disturbance and Recovery (Phil. Trans. Royal Society B 335), pp 425-436. Alden Press, Royal Society, OxfordGoogle Scholar
  19. Jansen A (1997) Terrestrial invertebrate community structure as an indicator of the success of a tropical rainforest restoration project. Restoration Ecology 5(2): 115-124Google Scholar
  20. Kokwaro JO (1984) The Kakamega Forest of Kenya: the easternmost relic of the equatorial rain forests of Africa. In: report on a workshop on the plant communities of Kenya. EMTA, Nairobi, KenyaGoogle Scholar
  21. Lucas GL (1968) Kenya. In: Hedberg I andHedberg O (eds) Conservation of Vegetation in Africa South of the Sahara. Acta Phytogeographica Suecica 54: 152-166Google Scholar
  22. MacFadyen A (1989) A brief study of the relationships between Maesopsis and some soil properties in the East Usambaras. In: Hamilton AC andBensted-Smith R (eds) Forest Conservation in the East Usambara Mountains Tanzania, pp 333-343. IUCN, Gland, Switzerland/Cambridge, UKGoogle Scholar
  23. Magurran AE (1988) Ecological Diversity and Its Measurement. Croom Helm, LondonGoogle Scholar
  24. Mahunka S (1989) Preliminary studies of the soil fauna of primary and secondary submontane rain forests on the East Usambaras. In: Hamilton AC andBensted-Smith R (eds) Forest Conservation in the East Usambara Mountains Tanzania, pp 345-346. IUCN, Gland, Switzerland/Cambridge, UKGoogle Scholar
  25. Mahunka S (1990) Aspects of the soil fauna in the Usambara mountains. In: Hedberg I andPersson E (eds) Research for the Conservation of Tanzanian Catchment, pp 108-112. Uppsala Universitet Reprocentralen HSC, Uppsala, SwedenGoogle Scholar
  26. Merwe M van der,Dippenaar-Schoeman AS andScholtz CH (1996) Diversity of ground-living spiders at Ngome State Forest, Kwazulu/Natal: a comparative survey in indigenous forest and pine plantations. African Journal of Ecology 34: 342-350Google Scholar
  27. Michelsen A,Lisanework N,Friis I andHolst N (1996) Comparisons of understorey vegetation and soil fertility in plantations and adjacent natural forests in the Ethiopian highlands. Journal of Applied Ecology 33: 627-642Google Scholar
  28. Muriuki JW andTsingalia MH (1990) A new population of de Brazza's monkey in Kenya. Oryx 24: 157-162Google Scholar
  29. Mutangah JG,Mwangani O andMwaura PK (1992) Kakamega Forest: a vegetation survey report. Unpublished report by Kenya Indigenous Forest Conservation Project, National Museums of Kenya, Nairobi, KenyaGoogle Scholar
  30. Pilsbry HA (1919) A Review of the Land Mollusks of the Belgian Congo Chiefly Based on the Collections of the American Museum Congo Expedition, 1909-1915. Bulletin of the American Museum of Natural History XL(I): 1-370Google Scholar
  31. Richards PW (with contributions by Walsh RPD, Baillie IC and Greig-Smith P 1996). The Tropical Rain Forest: An Ecological Study. Cambridge University Press, CambridgeGoogle Scholar
  32. Rodgers WA (1993) The conservation of the forest resources of eastern Africa: past influences, present practices and future needs. In: Lovett JA andWasser SK (eds) Biogeography and Ecology of the Rain Forests of Eastern Africa, pp 283-318. Cambridge University Press, CambridgeGoogle Scholar
  33. Rodgers WA andHomewood KM (1982) Species Richness and Endemism in the Usambara mountain Forest, Tanzania. Biological Journal of the Linnean Society 18: 197-242Google Scholar
  34. Sawyer J (1993) Plantations in the Tropics. IUCN, Gland, Switzerland/Cambridge, UKGoogle Scholar
  35. Sawyer JA,Harcourt CS andCollins NM (eds) (1992) The Conservation Atlas of Tropical Forests: Africa. IUCN, New York/LondonGoogle Scholar
  36. Shikov EV (1984) Effects of land use changes on the land mollusc fauna in the central portion of the Russian plain. In: Solem A andvan Bruggen AC (eds) World-Wide Snails, pp 237-248. Brill, Leiden, The NetherlandsGoogle Scholar
  37. Tattersfield P (1996) Local patterns of land-snail diversity in a Kenyan rain forest. Malacologia 38: 161-180Google Scholar
  38. Tattersfield P (1998) Patterns of diversity and endemism in East African land snails, and the implications for conservation. Journal of Conchology, Special Publication No. 2, 77-86Google Scholar
  39. Tsingalia MH (1990) Habitat disturbance, severity and patterns of abundance in Kakamega Forest,Western Kenya. African Journal of Ecology 28: 213-226Google Scholar
  40. Turton SM andFreiburger HJ (1997) Edge and aspect effects on the microclimate of a small tropical remnant of the Atherton Tableland, Northeastern Australia. In: Laurance WF andBierregaard RO (eds) Tropical Forest Remnants, pp 45-54. University of Chicago Press, ChicagoGoogle Scholar
  41. Verdcourt B ( 1983) A list of the non-marine Mollusca of East Africa (Kenya, Uganda, Tanzania excluding Lake Malawi). Achatina 11: 200-239Google Scholar
  42. Waldén H (1981) Communities and diversity of land molluscs in Scandanivian woodlands. 1. High diversity communities in taluses and boulder slopes in SW Sweden. Journal of Conchology, London 30: 351-372Google Scholar
  43. Wäreborn I (1969) Land molluscs and their environments in an oligotrophic area in southern Sweden. Oikos 20: 461-479Google Scholar
  44. Wass P (ed) (1995) Kenya's Indigenous Forest: Status, Management and Conservation. IUCN, Gland, Switzerland/Cambridge, UKGoogle Scholar
  45. Watt AD,Stork NE,Eddington P,Srivastava D,Bolton B,Larsen TB,Brendell MJD andBignell DE (1997) Impact of forest loss and regeneration on insect abundance and diversity. In: Watt AD,Stork NE andHunter MD (eds) Forests and Insects, pp 273-286. Chapman & Hall, LondonGoogle Scholar
  46. Wilson WL andJohns AD (1982) Diversity and abundance of selected animal species in undisturbed forest, selectively logged forest and plantations in East Kalimantan, Indonesia. Biological Conservation 24: 205-218Google Scholar
  47. White F (1983) The Vegetation of Africa: A Descriptive Memoir to Accompany the Unesco/ AETFAT/UNSO Vegetation Map of Africa. Unesco, ParisGoogle Scholar
  48. Zimmerman DA (1972) The avifauna of the Kakamega Forest,Western Kenya, including a bird population study. Bulletin of the American Museum of Natural History 149: 255-340Google Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Peter Tattersfield
    • 1
  • Mary B. Seddon
    • 1
  • Charles N. Lange
    • 2
  1. 1.Department of Biodiversity & Systematic BiologyNational Museum of WalesCardiffUK
  2. 2.National Museums of KenyaNairobiKenya

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