Wildebeest (Connochaetes taurinus) Population Densities and Distribution in Dry and Wet Season in the Kilimanjaro Landscape

Noah Sitati^1*, Kenana Lekishon², Samuel Bakari³, Fiesta Warinwa¹, Stephen Ndambuki Mwiu², Nathan Gichohi¹, Elphas Bitok², Machoke Mwita³, Hamza K. Ija³, Joseph Mukeka²

¹African Wildlife Foundation, Namanga, Kenya.
²Kenya Wildlife Service, Nairobi, Kenya.
³Tanzania Wildlife Research Institute, Arusha, Tanzania.

DOI: 10.4236/nr.2014.513070                

Abstract

The conservation of migratory wildlife species in the savannah habitat can be a challenge because of frequent and prolonged drought and their requirements for a large area. We investigated the performance of the wildebeest (Connochaetes taurinus) population in the 25,624 km² Kilimanjaro landscape of Kenya and Tanzania, which comprises Amboseli-West Kilimanjaro-Magadi-Natron after 2009 drought. We used total aerial counts to determine the spatial distribution and numbers of wildebeests during wet and dry season in 2010 and 2013. Global Positioning System and digital voice recorders were used to count wildebeests along established transects within blocks. There was an increase in the wildebeest population by 103% during the wet season and 14% during the dry season between 2010 and 2013. The seasonal variation in density occurred between the four counting blocks with Natron and Magadi areas recording the highest densities. Generally, the increase in population could be attributed to the recovery of the population after the 2009 drought. The current cross border collaboration between Kenya and Tanzania in aerial surveys is an important step in the conservation of this migratory species in the landscape. This study demonstrates that detailed knowledge of density and spatial distribution of migratory species is required to plan effective conservation action.

Keywords

Aerial Count, Density, Kilimanjaro Landscape, Seasons, Wildebeest, Trans-Boundary

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Ottichilo, W.K., de Leeuw, J. and Prins, H.H.T. (2001) Population Trends of Resident Wildebeest [Connochaetes taurinus hecki (Neumann)] and Factors Influencing Them in the Masai Mara Ecosystem, Kenya. Biological Conservation, 97, 271-282. http://dx.doi.org/10.1016/S0006-3207(00)00090-2
[2]	Spinage, C.A. (1992) The Decline of the Kalahari Wildebeest. Oryx, 26, 147-150. http://dx.doi.org/10.1017/S0030605300023577
[3]	Whyte, I.J. (1985) The Present Ecological Status of the Blue Wildebeest (Connochaetes taurinus, Burchell, 1823) in the Central District of the Kruger National Park. M.Sc. Thesis, University of Natal, Pietermaritzburg.
[4]	Whyte, I.J. and Joubert, S.C.J. (1988) Blue Wildebeest Population Trends in the Kruger National Park and the Effects of Fencing. South African Journal of Wildlife Research, 18, 78-87.
[5]	Berry, H.H. (1981) Abnormal Level of Disease and Predation as Limiting Factors for Wildebeest in the Etosha National Park. Madoqua, 12, 242-252.
[6]	Starfield, A.M., Smuts, G.L. and Shiell, J.D. (1976) A Simple Wildebeest Population Model and Its Applications. South African Journal of Wildlife Research, 6, 95-98.
[7]	Ogutu, J.O. and Owen-Smith, N. (2003) ENSO, Rainfall and Temperature Influences on Extreme Population Declines among African Savanna Ungulates. Ecology Letters, 6, 412-419. http://dx.doi.org/10.1046/j.1461-0248.2003.00447.x
[8]	Mduma, S.A.R., Sinclair, A.R.E. and Hilborn, R. (1999) Food Regulates the Serengeti Wildebeest: A 40-Year Record. Journal of Animal Ecology, 68, 1101-1122. http://dx.doi.org/10.1046/j.1365-2656.1999.00352.x
[9]	Sitati, N.W. and Wishitemi, B.E.L. (2003) Wildebeest Migration and Tourism Seasonality Pattern and Dynamics in the Mara Ecosystem, Kenya. African Journal of Business and Economics, 2, No. 1.
[10]	Ogutu, J., Owen-Smith, N., Piepho, H.P. and Said, M.Y. (2011) Continuing Wildlife Population Declines and Range Contraction in the Mara Region of Kenya during 1977-2009. Journal of Zoology, 285, 99-109. http://dx.doi.org/10.1111/j.1469-7998.2011.00818.x
[11]	Sinclair, A.R.E. (1995) Population Limitation of Resident Herbivores. In: Sinclair, A.R.E. and Arcese, P., Eds., Serengeti II: Research, Management and Conservation of an Ecosystem, University of Chicago Press, Chicago, 194-219.
[12]	Maddock, L. (1979) The Migration and Grazing Succession. In: Sinclair, A.R.E. and Arcese, P., Eds., University of Chicago Press, Chicago, 104-129.
[13]	Wilmshurst, J.F., Fryxell, J.M., Farm, B.P., Sinclair, A.R.E. and Henschel, C.P. (1999) Spatial Distribution of Serengeti Wildebeest in Relation to Resources. Canadian Journal of Zoology, 77, 1223-1232. http://dx.doi.org/10.1139/z99-088
[14]	Wolanski, E., Gereta, E., Borner, M. and Mduma, S. (1999) Water, Migration and the Serengeti Ecosystem. American Scientist, 87, 526-523. http://dx.doi.org/10.1511/1999.42.838
[15]	Fryxell, J.M. (1995) Aggregation and Migration by Grazing Ungulatesin Relation to Resources and Predators. In: Sinclair, A.R.E. and Arcese, P., Eds., Serengeti II, University of Chicago Press, Chicago, 257-273.
[16]	Murray, M.G. (1995) Specific Nutrient Requirements and Migration of Wildebeest. In: Sinclair, A.R.E. and Arcese, P., Eds., Serengeti II, University of Chicago Press, Chicago, 231-256.
[17]	Okello, M.M. (2005) Land Use Changes and Human-Wildlife Conflicts in the Amboseli Area, Kenya. Human Dimensions of Wildlife, 10, 19-28. http://dx.doi.org/10.1080/10871200590904851
[18]	Serneels, S. and Lambin, E. (2001) Impact of Land-Use Change on the Wildebeest Migration in the Northern Part of the Serengeti-Mara Ecosystem. Journal of Biogeography, 28, 391-407. http://dx.doi.org/10.1046/j.1365-2699.2001.00557.x
[19]	Okello, M.M. and Kiringe, J.W. (2004) Threats to Biodiversity and the Implications in Protected and Adjacent Dispersal Areas of Kenya. Journal of Sustainable Tourism, 12, 55-69. http://dx.doi.org/10.1080/09669580408667224
[20]	Okello, M.M., Wishitemi, B.E. and Lagat, B. (2005) Tourism Potential and Achievement of Protected Areas in Kenya: Criteria and Prioritization. Tourism Analysis, 10, 151-164. http://dx.doi.org/10.3727/108354205776259286
[21]	Croze, H., Sayialel, S. and Sitonic, D. (2006) What’s on in the Ecosystem: Amboseli as a Biosphere Reserve. A Compendium of Conservation and Management Activities in the Amboseli Ecosystem. ATE/AERP, UNESCO/MAB, Nairobi, 28 p.
[22]	Western, D. (1973) The Structure, Dynamics, and Changes of the Amboseli Ecosystem. Ph.D. Thesis, University of Nairobi, Nairobi.
[23]	Western, D. and Van Praet, C. (1973) Cyclical Changes in the Habitat and Climate of an East African Ecosystem. Nature, 241, 104-106. http://dx.doi.org/10.1038/241104a0
[24]	TWCM (1998) Aerial Census in West Kilimanjaro. Tanzania, Dry Season, 1997. TWCM Aerial Survey, Unpublished AWF Report.
[25]	TAWIRI (2009) Aerial Census in West Kilimanjaro. Tanzania, Dry Season, 2009. TAWIRI Aerial Survey Report.
[26]	Kenana, L.M., Bakari, S.K., Bitok, E., Machoke, N.M., Hamza, H.K., Mukeka, J., Chepkwony, R.K. and Mwiu, S.N., (2013) Total Aerial Count for Amboseli-West Kilimanjaro and Magadi-Natron Cross Border Landscape, April 2013. Unpublished Technical Report for KWS, Kenya and TAWIRI, Tanzania.
[27]	Norton-Griffiths, M. (1978) Counting Animals. African Wildlife Foundation.
[28]	Dirschl, H., Norton-Griffiths, M. and Wetmore, S.P. (1981) Training Observers for Aerial Surveys of Herbivores. Wildlife Society Bulletin, 9, 108.
[29]	Ottichilo, W.K. and Sinange, R.K. (1985) Differences in the Visual and Photographic Measurements in the Estimation of Strip Widths for Aerial Censuses of Animal Populations. DRSRS, Ministry of Planning and National Development, Nairobi.
[30]	SPSS (2011) Statistics for Windows, Version 20.0. IBM Corp., Armonk.
[31]	KWS & TAWIRI (2010) Aerial Total Count: Amboseli-West Kilimanjaro and Magadi-Natron Cross Border Landscape, March 2010. Unpublished KWS/TAWIR Report.
[32]	Kenana, L.M., Maliti, H.T., Kanga, E.M., Kyale, D.M., Bakari, S.K., Massawe, E.T., Kimutai, D.K, Machoke, N.M., Hamza, H.K. and Mwiu, S.N. (2010) Total Aerial Count for Amboseli-West Kilimanjaro and Magadi-Natron Cross Border Landscape, October 2010. A Technical Report for KWS, Kenya and TAWIRI, Tanzania.
[33]	Kenana, L.M., Bakari, S.K., Bitok, E., Machoke, N.M., Hamza, H.K, Mukeka, J., Mwiu, S.N., Kyale, D.M. and Cheptei, J. (2013) Large Mammalaerial Total Count for Amboseli-West Kilimanjaro and Magadi-Natron Cross Border Landscape, October 2013. A Technical Report for Kenya Wildlife Service (KWS), Kenya and Tanzania Wildlife Research Institute (TAWIRI), Tanzania.
[34]	Thirgood, S., Mosser, A., Tham, S., Hopcraft, G., Mwangomo, E., Mlengeya, T., Kilewo, M., Fryxell, J., Sinclair, A. R.E. and Borner, M. (2004) Can Parks Protect Migratory Ungulates? The Case of the Serengeti Wildebeest. Animal Conservation, 7, 113-120. http://dx.doi.org/10.1017/S1367943004001404