Aquatic bird assemblages of a tropical African man-made lake

Aquatic birds are important biotic components of Lake Ecosystem serving as indicator of pollution, sources of protein, fishing agent, income, recreation, tourism, sport and pest control. The aim of this study was to provide a baseline data and checklist of the bird assemblages in Asa Lake, Ilorin, Nigeria. Bird sampling was conducted weekly for 24 weeks, by walking 10 mS-1 along a line transect on the bank of the lake. The populations were classified as rare, frequently seen and common based on the number of sightings, and abundance. Diversity indices such as dominance, evenness, Simpson diversity, Shanon-Weiner diversity, Marglef’s richness were estimated. 13682 birds consisting of 17 species in 9 families were recorded in the lake. Species were found in highest number during the rains. Water fowl was the most abundant species 42.21%. African jacana was the least abundant constituting 0.67%. Family Ardeidae was the most abundant in terms of species diversity. Three species were commonly seen, four frequently seen, while nine were rare. Diversity indices of the bird species were; (D) 0.045, (1-D) 0.95; (e^H/S) 0.96, Margalef richness 3.67 and (H) 2.99. The assemblage of bird species in the lake was high due to the availability of food, submerged aquatic macrophytes seeds and foliage, large volume of water, surface area and depth of the lake and absence of large predators. Morphological characteristics and behavioural tactics of the birds were attributed to the high occurrence of some of the birds. For continued residency of the birds in the lake, lake best management practices (LBMP) should be implemented. Continuous monitoring of the birds (bio monitor) in the lake should also be done to give an insight into the ecological conditions of the lake and at the same time serving as aesthetic organisms in the lake. Keywords: Birds; assemblages; lake; foraging; diversity; macrophytes; waterfowl References: Ali, S. (1943). The book of Indian birds. The Bombay Natural History Society; Bombay, India. Araoye, P. A. (2009). The seasonal variation of pH and dissolved oxygen (DO2) concentration in Asa lake Ilorin, Nigeria. International Journal of Physical Sciences, 4(5), 271-274. Bibby, C. J., Burgess, N. D., Hill, D. A., & Mustoe, S. (2000). Bird census techniques. Elsevier. Brasil. Ministry of Environment, Water Resources and Legal Amazon (Brasilia, DF). (1997). Conservation Plan of the Upper Paraguay Basin (Pantanal) -PCBAP: integrated and prognostic analysis of the Upper Paraguay Basin. Colwell, M. A., & Taft, O. W. (2000). Waterbird communities in managed wetlands of varying water depth. Waterbirds, 23, 45-55. Donatelli, R. J., Posso, S. R., & Toledo, M. C. B. (2014). Distribution, composition and seasonality of aquatic birds in the Nhecolândia sub-region of South Pantanal, Brazil. Brazilian Journal of Biology, 74(4), 844-853. Evans, M. I. (1994). Important bird's areas in the Middle East. Bird Life International, p. 410. Garay, G. L. A. D. Y. S., Johnson, W. E., & Franklin, W. L. (1991). Relative abundance of aquatic birds and their use of wetlands in the Patagonia of southern Chile. Revista Chilena de Historia Natural, 64, 127-137. Gaston, A. J. (1975). Methods for estimating bird populations. Journal of the Bombay Natural History Society, 72(2), 271-283. Grimmett, R., Inskipp, C., Inskipp, T., & Byers, C. (1999). Pocket guide to the birds of the Indian subcontinent. Oxford University Press, p. 384. Grimmett, R., & Inskipp, T. (2018). Birds of northern India. Bloomsbury Publishing, New Delhi, India, p. 240. Hammer, O., Harper, D. A. T., & Ryan, P. D. (2001). PAST: Paleontological Statistics Software Package for Education and Data Analysis. Palaeontologia Electronica, 4: 9. Hoyer, M. V., & Canfield, D. E. (1994). Bird abundance and species richness on Florida lakes: influence of trophic status, lake morphology, and aquatic macrophytes. In Aquatic birds in the trophic web of lakes. Springer, Dordrecht, pp. 107-119. Hoyer, M. V. (2013). Lake Management and Aquatic Birds. 17, 17-20. Knapton, R. W., & Petrie, S. A. (1999). Changes in distribution and abundance of submerged macrophytes in the Inner Bay at Long Point, Lake Erie: implications for foraging waterfowl. Journal of Great Lakes Research, 25(4), 783-798. MaGuarran, A. (1988). Ecological diversity and its measurement. Princeton University Press. New Jersey, p. 178. Malizia, L. R. (2001). Seasonal fluctuations of birds, fruits, and flowers in a subtropical forest of Argentina. The Condor, 103(1), 45-61. Mustapha, M. K. (2011). Perspectives in the Limnology of Shallow Tropical African Reservoirs in Relation to Their Fish and Fisheries. Journal of Transdisciplinary Environmental Studies, 10(1). Oliveira, D. M. M. D. (2006). Efeitos bioticos e abioticos de ambientes alagaveis nas assembleias de aves aquaticas e piscivoras no Pantanal, Brasil. Paszkowski, C. A., & Tonn, W. M. (2000). Community concordance between the fish and aquatic birds of lakes in northern Alberta, Canada: the relative importance of environmental and biotic factors. Freshwater Biology, 43(3), 421-437. Rajpar, M. N., & Zakaria, M. (2011). Bird species abundance and their correlationship with microclimate and habitat variables at Natural Wetland Reserve, Peninsular Malaysia. International Journal of Zoology, 2011. Serle, W., Morel, G. J., & Hartwig, W. (1992). Birds of West Africa. Collins Publication, London, p. 351. Shirihai, H., & Christie, D. (1996). The Macmillan birder's guide to European and Middle Eastern birds: including North Africa. Macmillan Pub Limited. Suter, W. (1994). Overwintering waterfowl on Swiss lakes: how are abundance and species richness influenced by trophic status and lake morphology?. In Aquatic Birds in the Trophic Web of Lakes. Springer, Dordrecht, pp. 1-14.

Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.