Effect of Land Use on Leaf Litter Decomposition in Upper Mara Streams, Kenya

  • Tsisiche A., M’merimba C. M. and Mbaka J. G. Egerton University
Keywords: Leaf litter, land use, Exotic, native, Processing rate, Mara River


Modification of riparian vegetation via land use change alters leaf litter processing rates in streams. This study aimed at investigating the effect of land use change from forestry to agriculture on leaf litter decomposition in the upper Mara River catchment, Kenya. The study involved collecting, drying and weighing leaves of Eucalyptus saligna (exotic) and Macrocalyx neubotonia (native). About 6g of each leaf species was enclosed in litter bags measuring 11 x 11cm and mesh size of 10mm. The bags were exposed randomly in six streams; three draining agricultural and three draining indigenous forests. They were later retrieved at intervals of 0, 1,3,7,14,28 and 48 days, dried and weighed. The difference in processing rates of Eucalyptus leaves were statistically not significant (insert test and statistics) between streams draining indigenous forest (mean -k = 0.039±0.009, pooled data) and streams draining agricultural areas decaying Macrocalyx leaves were –k = 0.095±0.005 in streams draining agricultural areas and k=0.062±0.01 for streams draining indigenous forest. The two values differed significantly (t = 2.892, d.f=4, p= < 0.05). Significant differences in processing rates were also evident between Eucalyptus and Macrocalyx leaves in streams draining indigenous and agricultural forests respectively (ttest, p<0.05). It would take 63 and 69 days for 90% of leaves of Eucalyptus to be processed in agricultural and forested streams respectively whilst Macrocalyx leaves would take 24 and 53 days. Processing rates for the two leaves were generally higher in agricultural streams than in forested streams most probably due to higher nutrients especially Phosphate concentration arising from agricultural land.  In all the study streams SRP had significant correlation with decay rates for both species. Significant differences in processing rates observed between the two leave species could be attributed to differences in leave toughness and the presence of inhibitory compounds in eucalypts. The findings of this study suggest that land use change interacts with change in the composition of riparian tree species to influence decomposition rates of leaf litter in streams. This has implications on the functional organization of shredders and nutrient cycling in streams. This study confirms that land use activity has an effect on litter decomposition rates in Upper Mara catchment streams. However Eucalyptus decomposition did not respond to change in land use activity because of its poor quality which masks the land use effect.

Author Biography

Tsisiche A., M’merimba C. M. and Mbaka J. G., Egerton University

Biological Sciences Department, Egerton University,

P.O. Box 536 – 20115 Egerton


Acuña, V., Díez, J. R., Flores, L., Meleason, M., and Elosegi, A. (2013). Does it make economic sense to restore rivers for their ecosystem services? Journal of Applied Ecolology: 10:1365-2664.
Allan, J. D. (2004). Landscapes and rivers capes: the influence of land use on stream ecosystems. Annual. Review Ecololgy. 35: 257–284
American Public Health Association- APHA (2004). Standard methods for the examination of water and wastewater, 21st Ed. Water Pollution Control Federation. Washington, D.C.
Bergfur J, and Friberg N, (2012). Trade-offs between fungal and bacterial respiration along gradients in temperature, nutrients and substrata: experiments with stream derived microbial communities. Fungal Ecology, 5:46-52.
Benfield, E. F., (1996). Comparison of litterfall input to streams: stream organic matter budgets. Journal of the North American Benthological Society, 16: 104-108.
Cuffney, T. F. and Wallace, J. B. (1987), Leaf litter processing in Coastal Plain streams and floodplains of southeastern Georgia, U.S.A. Archive Hydrobiology, 76:1-24.
Canhoto, C., Bärlocher F. and Graça M. A. S. (2002). The effects of Eucalyptus globules oils on fungal enzymatic activity. Archive Hydrobiology, 154: 121-132.
Carpenter, S. R., Caraco, N. F., Correll, D. L., Howarth, R. W., Sharpley, A. N. and Smith, V. H. (1998). Nonpoint pollution of surface waters with phosphorus and nitrogen. Ecological Applications, 8: 559–568.
Cortes, R. M. V., Abelho, M. and Rebelo, S. B. (1997). The macroinvertebrate colonization of leaf bags: is there a pattern? Limnetica 13: 71–75.
Ferreira V, Elosegi A, Gulis V, Pozo J. and Graça M. A. S. (2006). Eucalyptus plantations affect fungal communities associated with leaflitter decomposition in Iberian streams. Archiv fur Hydrobiologie. 166: 467–490.
Filoso, S., (2009). Environmental markets: the power of regulation response.
Science 326, 1061– 1062.
Gessner, M. O. and Chauvet, E. (2002). A case for using litter breakdown to assess functional stream integrity. Ecological Applications 12: 498– 510.
Graça, M. A. S., Pozo, J., Canhoto C. and Elosegi A. (2002). Effects of Eucalyptus plantations on detritus, decomposers and detritivores in streams. The Scientific World, 2: 1173-1185
Graça, M. A., Bärlocher F. and Gessner M. (2005). Methods to Study Litter Decomposition: APractical Guide, 37-42. Dordrecht, the Netherlands: Springer.
Grattan, R.M. I. and Suberkropp, K. (2001). Effects of nutrient enrichment on yellow poplar leaf decomposition and fungal activity in streams. Journal of the North American Benthological Society, 20: 33–43.
Kenya Forestry Service (KFS) (2009). A Guide to On-Farm Eucalyptus Growing in Kenya.
Hoffmann, A. (2005). Dynamics of fine particulate organic matter (FPOM) and macroinvertebrates in natural and artificial leaf packs. Hydrobiologia. 549:167–178.
Larranga, A., Basaguren, S., Elsogei, A. and Pozo, J. (2006) Assessing the impact of Eucalyptus plantation on benthic macroinvertebrate communities by litter exclusion experiment. International Journal of Limnology, 42:1-8.
Lovett, J. C. and Wasser, S. K., (1993). Biogeography and Ecology of the
Rain Forests of Eastern Africa. Cambridge University Press, Cambridge
Majer, J. D. and Recher, H. F., (1999). Are Eucalypts Brazil’s friend or foe?
An entomological viewpoint. Anais da Sociedade Entomológica do Brasil, 28:185-200.
Masese F. O., Kitaka N., Kipkemboi J., Gettel G. M, Irvine K. and McClain M. E. (2014). Litter processing and shredder distribution as indicators of riparian and catchment influences on ecological health of tropical streams. Ecological Indicators, 46: 23–37.
Mathuriau, C. and Chauvet, E. (2002). Breakdown of leaf litter in a neotropical stream. Journal of the North American Benthological Society, 21: 384–396.
Minaya, V., McClain, M.E., Moog, O., Omengo, F. and Singer, G. (2013). Scale-dependent effects of rural activities on benthic macroinvertebrates and physico-chemical characteristics in headwater streams of the Mara River, Kenya. Ecological Indicators 32,116–122
Moretti, M. S., Gonçalves, J. F., Ligeiro, R. and Callisto, M. (2007). Invertebrates colonization on native trees leaves in a neotropical stream (Brazil). International Review Hydrobiology 92:199-210.
Murphy, J.F. and Giller, P. S. (2000) Seasonal dynamics of macroinvertebrate assemblages in the benthos and associated with detritus packs in two low-order streams with different riparian vegetation. Freshwater Biology, 43: 617–631.
Peterson, R. C., and Cummins, K. W. (1974). Leaf processing in a woodland stream. Freshwater Biology, 4: 343-368.
Rosemond, A. D., Pringle, C. M., Ramı´rez, A., Paul, M. J., & Meyer, J. L.
(2002). Landscape variation in phosphorus concentration and effects on detritus-based tropical streams. Limnology and Oceanography, 47: 278–289.
Sweeney, B. W., Bott, T. L., Jackson, J. K., Kaplan, L. A., Newbold, J. D., Standley, L. J., Hession, W. C. and Horwitz, R. J. (2004) Riparian deforestation, stream narrowing, and loss of stream ecosystem services. Proceedings of the National Academy of Sciences of the United States of America.
Suberkropp, K., Gulis, V., Rosemond, A. D., and Benstead, J. P. (2010). Ecosystem and physiological scales of microbial responses to nutrients in a detritus based stream: Results of a 5 year continuous enrichment.
Limnology and Oceanography, 55: 149-155.
How to Cite
Tsisiche A., M’merimba C. M. and Mbaka J. G. (2019). Effect of Land Use on Leaf Litter Decomposition in Upper Mara Streams, Kenya. Egerton Journal of Science and Technology, 16(1-139). Retrieved from https://eujournal.egerton.ac.ke/index.php/EJ/article/view/24
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