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DIVERSITY AND ECOLOGY OF MACROFAUNA IN LAND USE MOSAICS EMBU
                                     AND TAITA DISTRICTS, KEN...
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Diversity and ecology of macrofauna in land use mosaics embu and taita districts, kenya

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Diversity and ecology of macrofauna in land use mosaics embu and taita districts, kenya

  1. 1. DIVERSITY AND ECOLOGY OF MACROFAUNA IN LAND USE MOSAICS EMBU AND TAITA DISTRICTS, KENYA Musombi, B.K1, Ayuke, F.O. 2 , Karanja, N.K2 , Nyamasyo, G.H.N2 Muya, E.M3 , Mungatu, J4 1 Department of Zoology, Invertebrate section, National Museums of Kenya, P.O Box 40658-00100, Nairobi, Kenya 2 University of Nairobi, P.O Box 30197-00200, Nairobi, Kenya 3 Kenya Agricultural Research Institute-NARL, (KARI), P.O. Box 14733-00100, Nairobi, Kenya 4 Department of Mathematics and Statistics, Jomo Kenyatta University of Agriculture and Technology D t t f M th ti d St ti ti J K tt U i it f A i lt dT h l SUMMARY The study aimed at evaluation the effect of land use on the diversity of macrofauna in Embu and Taita benchmark sites. The study demonstrated that quantitative changes in diversity and density of soil fauna communities occur when various land use mosaics are subjected to different management and varying levels of intensification. These may be associated with management practices. Significant correlation between some soil macrofauna groups with selected soil chemical properties showed that, soil chemical characteristics play a role in influencing density, distribution and structure of macrofauna communities. SOME MACROFAUNA RESULTS INTRODUCTION •Generally macrofauna density was higher in the arable systems Soil macrofauna are soil organisms larger than 2mm in diameter and than in the forests, although the differences were not always include :Earthworms, Termites, significant. Ants, beetles among other key soil •Forests harbored higher Chilopoda and Isopoda density than the organisms. They influence, decomposition, bi d d iti biodegradation of d ti f agro ecosystems. organic residues, organic matter • Low diversity and density of macrofauna were recorded in dynamics, humification, nutrient coffee, tea and mixed agricultural systems. release, Improve soil: physical parameters e.g. structure bulk •There was a significant correlations between some soil fauna density, Porosity, water percolation Earthworm groups to soil chemical properties e.g. Isopoda and Chilopoda and retention were positively correlated with acidity and soil carbon (Fig 1A & B) OBJECTIVE •Comparatively, Embu was less diverse on macro fauna -To understand the i d d h impact of land- fl d compared to Taita with thirty four and seventy seven d T i i h hi f d use on dynamics of soil macrofauna genera/species respectively. MATERIAL AND METHODS - At each sampling point a monolith of dimensions 0.25m x 0.25m and 0.3m deep is isolated, a transect and baited pit fall were also used (Fig 1). Termites Recovered earthworms were relaxed, killed and fixed in 4% formalin before preservation. -All other Macrofauna are placed in 70% alcohol for later processing and identification. Pitfall trap 20m Fig 1. Correlation between soil characteristics and Chilopoda 2m CONCLUSION 20 by 2 mTransect for quadrat and form sam alin pling 8m 1m2Quadrat Quantitative changes in diversity and density of soil fauna occur when land use systems are subjected to varying levels of intensification . These are associated with management Monolith 0.25 x 0.25 x 0.3mMonolith practices such as change of habitats, modification of soil microclimate, addition of soil amendments use of agrochemicals, removal of substrate , low diversity and Ants availability of food sources. This indicates the potential of Fig 1. Sampling plan for macrofauna using these fauna groups as bio-indicators of soil productivity bio- Acknowledgments •Conservation and Sustainable Management of Belowground Biodiversity (CSM-BGBD) Project

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