POPULATION AND FEEDING ECOLOGY OF THE MARABOU STORK (LEPTOPTILOS CRUMENIFERUS) AROUND LAKE ZIWAY, ETHIOPIA
Abstract
A study was carried out around Lake Ziway, covering both dry and wet seasons in 2010, to investigate the population structure, habitat
association and feeding ecology of the Marabou stork (Leptoptilos crumeniferus). Sample sites were designed based on the vegetation type and
area cover. Line transects and point counts counting methods were used on the randomly selected sampling sites. Focal sampling method was also
employed for observation of feeding. Face-to-face standard questionnaire interview and direct observation techniques were also conducted. A total of
318 and 594 Marabou storks were counted during dry and wet seasons,respectively. The number of birds during the dry and wet seasons was
significantly different (p<0.05). Lake shore was highly preferred for feeding. They were observed to feed on food items such as fish scraps (41%), carrions (23%), frogs (16%), worms (12%) and insects (9%), with variations from season to season. Their breeding nests were mostly in the town and on Acacia tortilis and Acacia nilotica trees. On average, 2.1 immature/young individuals were observed per nest. Habitat degradation in connection with agricultural activities of floriculture and urban expansion are the main threats to the survival of the Marabou stork and other wetland birds of the present study area.
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References
Campbell, B. (1974). The Dictionary of Birds in Color. The Viking Press. http://animaldiversity.ummz.umich.edu/site/accounts/information/Leptoptilos_cru meniferus.html (Accessed on July 2010).
Degefu Workineh (1987). Some Aspects of Meteorological Drought in Ethiopia: Drought and Hunger in Africa. Glantz, Cambridge.
Hancock, J.A., Kushlan, J.A. and Kahl, M.P. (1992). Storks, Ibises and Spoonbills of the World. Academic Press Limited, California.
Hertel, F. (1994). Diversity in body size and feeding morphology within past and present vulture assemblages. Ecology 75: 1074-1084.
Hoyo, J., Elliot, A. and Sargatal, J. (1992). Handbook of the Birds of the World. Volume 1: Ostrich to Ducks. Lynx Edicions, Barcelona.
Jokimäki, J., Suhonen, J., Inki, K. and Jokinen, S. (1996). Biogeographical comparison of winter bird assemblages in urban environments in Finland. J. Biogeogr. 23: 379-386.
Jones, M. (1998). Study Design. In: Expedition Field Techniques, Bird Surveys, pp.15-34 (Bibby, C., Jones, M. and Marseden, S., eds.). Royal Geographical Society with the Institute of British Geographer, London.
Kahl, M.P. (2010). A contribution to the ecology and reproductive biology of the Marabou stork (Leptoptilos crumeniferus) in East Africa. J. Zool. 148: 289-311.
Lee, P. and Rotenberry, J.T. (2005). Relationships between bird species and tree species assemblages in forested habitats of eastern North America. J. Biogeogr. 32: 1139-1150.
MacArthur, R.H. and Pianka, E.R. (1966). On optimal use of a patchy environment. Am.Nat. 100: 603-609.
Mlingwa, C. (2002). Breeding of the Marabou Stork Leptoptilos crumeniferus in Tanzania. Proceedings of the Third Annual Scientific Conference, Tanzania Wildlife Research Institute, Arusha.
Monadjem, A. (2005). Breeding biology of the Marabou Stork (Leptoptilos crumeniferus) in Swaziland. Ostrich 76: 90-94.
Monadjem, A., Andrew, J., Bamford, A.J. and Rasmussen, M. (2008) Dispersal of juvenile Marabou Storks Leptoptilos crumeniferus as determined by re-sightings. Ostrich 79: 187-189.
Monadjem, A., Bamford, A.J., Hardy, I.C.W., Earnshaw, J.K. and Franklin, E. (2010) Temporal and sex-specific variation in growth rates of Marabou Stork Leptoptilos crumeniferus chicks. Ostrich 81: 85-91.
Pettingill, O.S. (1985). Ornithology in Laboratory and Field. Academic Press, London.
Pol, J.L. (2006). A Guide to Endemic Birds of Ethiopia and Eritrea. 2 nd ed. Shama Books, Addis Ababa.
Pomeroy, D.E. (1977). Marabou Stork Leptoptilos crumeniferus breeding colonies in Uganda. J. East Afr. Nat. Hist. Soc. Nation. Muse. 31: 1-11.
Pomeroy, D.E. (1978). Seasonality of Marabou Storks (Leptoptilos crumeniferus) in Eastern Africa. Ibis 120: 313-321.
Richardson, W.J. (1978). Timing and amount of bird migration in relation to weather: A review. Oikos 30: 224-272.
Shimelis Aynalem and Afework Bekele (2008). Species composition, relative abundance and distribution of bird fauna of riverine and wetland habitats of Infranz and Yiganda at southern tip of Lake Tana, Ethiopia. Trop. Ecol. 49: 199-209.
Tarboton, W. (2001). A Guide to the Nests and Eggs of Southern African Birds. Struik, Cape Town.
Tenalem Ayenew (2004). Environmental implications of changes in the levels of lakes in the Ethiopian Rift since 1970. Reg. Environ. Change 4: 12-204.
WCMC (World Conservation Monitoring Center) (1992). Global Biodiversity: Status of the Earth’s Living Resources. Chapman and Hall, London.
Woodcock, M. and Hayman, P. (1982). The Birds of Africa. Vol. I. Academic Press,London.
