Diversity of Birds in Highland Reservoirs and Adjoining Areas of Tigray, Northern Ethiopia: Implication for Conservation
Abstract
Avian diversity is among the key components of the earth’s biodiversity that serve as unique barometers for environmental change. Bird diversity in unprotected habitats such as reservoirs in the Tigray region is less known. A study was conducted to assess the avian diversity in highland reservoirs of the Tigray region, particularly at Maygundi and Maysye reservoirs and their adjoining habitats from August 2022 to March 2023, covering both wet and dry seasons. A line transect and point count methods aided by binoculars were used to estimate avian species diversity and distribution. Biodiversity indices and Two-way ANOVA were used to analyze the data. A total of 1,813 individual birds belonging to 151 species, 17 orders and 51 families were recorded during the study period. Egyptian goose was the most abundant species (19.58 %), followed by Little Grebe (10. 86 %), Eurasian Coot (7.00 %), Ruff and Yellow Mantle Widowbird (3.31 % for each). A significant variation in the number of bird species between wet and dry seasons (F = 1225, df = 1, P = 0.02) and between reservoirs (F = 484, df = 1, P = 0.03) was observed. However, there was no significant difference in abundance of birds between wet and dry seasons in both reservoirs (P > 0.05). Maysye reservoir had high bird species diversity (H′ = 3.66), while Maygundi reservoir had the lowest (H′ = 3.24). The study shows that sedimentation and habitat destruction due to anthropogenic activities, including the expansion of settlements; agriculture and livestock grazing were the main threats to bird diversity. The highland reservoirs and their adjoining habitats support high avian species diversity including endemic and endangered species revealing the importance of the sites for bird conservation. Therefore, urgent conservation measures are recommended for long-term bird conservation.
References
Aerts, R., Lerouge, F., November, E., Lens, L., Hermy, M. & Muys, B. 2008. Land rehabilitation and the conservation of birds in a degraded Afromontane landscape in northern Ethiopia. Biodiversity and Conservation, 17, 53-69.
https://doi.org/10.1007/s10531-007-9230-2
Aerts, R., Maes, W., November, E., Negussie, A., Hermy, M. & Muys, B. 2006. Restoring dry Afromontane forest using bird and nurse plant effects: direct sowing of Olea europaea ssp. cuspidata seeds. Forest Ecology and Management, 230, 23-31.
https://doi.org/10.1016/j.foreco.2006.04.001
Alemayehu, S. & Dereje, Y. 2021. Diversity, distribution and relative abundance of avifauna at Ansas Dam and surrounding farmland site Debre Birhan Town, Ethiopia. Avian Biology Research, 14 (1), 8-17.
https://doi.org/10.1177/1758155920963200
Asmare, B. D., Derebe, Y. & Tamer, M. 2023. Diversity and relative abundance of bird species in the two habitat types of Dokima forest Awi zone, Ethiopia. PLoS ONE, 18(3): e0281595.
https://doi.org/10.1371/journal.pone.0281595
Bibby, C., Burgessand, J. & David, H. 1992. Bird census techniques. London. Academic Press.
Bibby, C., Jones, M. & Marsden, S. 1998. Bird Surveys: Expedition Field Techniques. The Expedition Advisory Center Royal Geographic Society, London.
Bibby, C. J., Burgess, N. D., Hill, D. A. & Mustoe, S. 2000. Bird census techniques. 2nd edition. Academic Press, London.
BirdLife International. 2017. Spotlight on threatened birds. Presented as part of the BirdLife State of the world's birds website. Available from: http://www.birdlife.org/datazone.
Conservation International. 2011. Biodiversity Hotspots Revisited. http://www.Biodiversity hotspots.org/xp/ Hotspots/resources/maps.xml.
Ethiopian Biodiversity Institute (EBI). 2015. Ethiopia's national biodiversity strategy and action plan 2015-2020.
Gibbons, D. W. & Gregory, R. D. 2006. Birds. In: Sutherland, W. J., ed. Ecological census techniques: a handbook. 2nd edition. Cambridge University Press, Cambridge.
https://doi.org/10.1017/CBO9780511790508.010
Girma, Z., Mengesha, G. & Asfaw, T. 2017. Diversity, relative abundance and distribution of avian fauna in and around Wondo Genet forest, South-central Ethiopia. Research Journal of Forestry, 11, 1-12.
https://doi.org/10.3923/rjf.2017.1.12
Hadis, T., Afework, B. & Simeneh A. 2020. Significance of Gefersa Artificial Reservoir and its surrounding habitat for the conservation of avifauna, Northwestern Addis Ababa, Ethiopia. Species, 21 (67), 53-61.
Hailu, T. & Bezawork, A. 2022. The role of Gullele Botanical Garden for bird conservation in Addis Ababa, Ethiopia. Ethiopian Journal of Biological Science, 21 (1), 1819-8678.
Hammer, O., Harper, D. & Ryan, P. 2001. PAST: Paleontological Statistics Software Package for Education and Data Analysis. Paleontologia Electronica, 4 (1), 1-9.
Hanson, T., Brooks, T. M. Da Fonseca, G. A., Hoffmann, M., Lamoreux, J. F., Machlis, G., Mittermeier, C. G., Mittermeier, R. A. & Pilgrim J. D. 2009. Warfare in Biodiversity Hotspots. Conservation Biology, 23 (3), 578-587.
https://doi.org/10.1111/j.1523-1739.2009.01166.x
Husen, A., Mishra, V. K., Semwal, K. & Kumar, D. 2012. Biodiversity Status in Ethiopia and Challenges. In: Bharati, K. P., Chauhan, A. and Kumar, P., eds. Environmental Pollution and Biodiversity. Discovery Publishing House Pvt Ltd. New Delhi, India. 31-79.
Jemal, Z., Girma, Z. & Mengesha, G. 2020. Bird Diversity in Nensebo Moist Afromontane Forest Fragment, South Eastern Ethiopia. The Open Ornithology Journal, 13, 1-9.
https://doi.org/10.2174/1874453202013010001
Kathleen, A., Nolan, K. & Callahan, J. E. 2005. The Shannon-Weiner species diversity index. Beachcomber Biology, 27, 334-338.
Kiros, W., Tsegazeabe, H., Solomon, K., Mokonen, T., Kibrom, F. & Meheretu, Y. 2014. Assessment of birds of the Arid water bodies in Tigray, Northern Ethiopia. International Journal of Biodiversity and Conservation, 6 (4), 333-341.
https://doi.org/10.5897/IJBC2014.0695
Manthey, J. D., Bourgeois, Y., Meheretu, Y. & Boissinot, S. 2022. Varied diversification patterns and distinct demographic trajectories in Ethiopian montane forest bird (Aves: Passeriformes) populations separated by the Great Rift Valley. Molecular Ecology, 31 (9), 2664-2678.
https://doi.org/10.1111/mec.16417
Mekbeb, T., Addisu, A. & Yila, D. 2022. Ambition for biodiversity BIODEV 2030. National Biodiversity Threat Assessment: Ranking Major Threats Impacting Ethiopia's Biodiversity. Accessed on February 2022.
Mengistu, W. 2003. Wetlands, Birds and important bird areas of Ethiopia. In: Abebe, Y. L., Geheb, K., eds. Wetlands of Ethiopia. Proceedings of Seminar on the Resource and Status of Ethiopia's Wetlands. Gland, Switzerland: International Union for conservation of Nature and Natural Resources, 25-36.
Nyssen, J. 2023. Establishment of a modest Tigray botanical garden in Belgium - An illustration of the Afromontane vegetation, 1 (17).
Otero, I., Farrell, K.N., Pueyo, S., Kallis, G., Kehoe, L., Haberl, H., Plutzar, C., Hobson, P., García-Márquez, R., Rodríguez-Labajos, B., Martin, J. L., Erb, K. L., Schindler, S., Nielsen, J., Skorin, T., Settele, J., Essl, F., Gómez-Baggethun, E., Brotons, L., Rabitsch,W., Schneide, F. & Pe'er, G. 2020. Biodiversity policy beyond economic growth. Conservation Letters, 13, e12713.
https://doi.org/10.1111/conl.12713
Redman, R., Stevenson, T. & Fanshawe, J. 2009. Birds of the Horn of Africa: Helm Field Guides. London. Christopher Helm Press, 1-512.
Rowe Karen, M. C., Selwood Katherine, E., Bryant, D. & Baker-Gabb, D. 2023. Acoustic surveys improve landscape-scale detection of a critically endangered Australian bird, the plains-wanderer. Wildlife Research.
https://doi.org/10.1071/WR22187
Santini, L., Tobias, J. A., Callaghan, C., Gallego-Zamorano, J. & Benítez-López, A. 2023. Global patterns and predictors of avian population density. Global Ecology and Biogeography, 00, 1-16.
https://doi.org/10.1111/geb.13688
Shannon, C. E. & Weaver, N. 1949. The Mathematical Theory of Communication. The University of Illinois, Urbana, 117.
Shimelis, A. & Afework, B. 2008. Species composition, relative abundance, and distribution of bird fauna of riverine and wetland habitats of Infranz and Yiganda at the Southern tip of Lake Tana, Ethiopia. Tropical Ecology, 49 (2), 199-209.
Shimelis, A. & Afework, B. 2009. Species composition, relative abundance and habitat association of the bird fauna of the montane forest of Zegie peninsula and nearby Islands, Lake Tana, Ethiopia. Ethiopian Journal of Science, 32, 45-56.
Sohil, A. & Sharma, N. 2020. Assessing the bird guild patterns in heterogeneous land use types around Jammu, Jammu, and Kashmir, India. Ecological Processes, 9 (1), 1-5.
https://doi.org/10.1186/s13717-020-00250-9
Tsegazeabe, H. 2023. Limnological factors that affect waterbird assemblages in semi-arid reservoirs of Tigray National Regional State, northern Ethiopia. Heliyon, 9 (6), e17110.
https://doi.org/10.1016/j.heliyon.2023.e17110
Teklay, G., Zeyede, T., & Tesfay, T. 2020. Bird Diversity and Community Composition in Kafta Sheraro National Park, Tigray, Northern Ethiopia. International Journal of Zoology.
https://doi.org/10.1155/2020/5016804
Tsehaye, A., Tadesse, D., Declerck, S., Nyssen, J., Van der Gucht, K., Risch, S., Rousseaux, S., De Wit, J., Afework, M., Nigussie, H., Abreha, G., Poesen, J., Deckers, J., Vyverman, W. & De Meester, L. 2007. Ecological Atlas of Reservoirs in Tigray, Northern Ethiopia. Tigray Livelihood Papers No. 4 vol. 80, VLIR-Mekelle University IUC Programme and Zala-Daget Project, Mekelle, Ethiopia.
Weldemariam, T. & Getachew, M. 2017. Impact of Climatic Change on Avian Populations: Implication for Long Term Conservation in Wildlife Genetic Resources. American Journal of Bioscience and Bioengineering. 5 (1), 23-33.
https://doi.org/10.11648/j.bio.20170501.15
Weldemariam, T. 2016. Bird Species Composition and Diversity in Wetlands of Awi zone and Wombera hotspot areas Northwestern, Ethiopia. Journal of Zoology Studies, 3 (5), 00-00.
Weldemariam, T., Demeke, D., Mengistu, W., Gebre Egziabeher, H. & Tadesse, H. 2020. Impact of wind energy development on birds and bats: the case of Adama wind farm, Ethiopia, The Journal of Basic and Applied Zoology, 81, 41.
https://doi.org/10.1186/s41936-020-00171-1
Yalden, D. 1983. The extent of high ground in Ethiopia compared to the rest of Africa. SINET: Ethiopian Journal of Science, 6, 35-38.
