Preliminary observations on the breeding ecology and potential threats to Bonelli’s Eagle Aquila fasciata in Sithagiri Malai, Tamil Nadu, India
DOI:
https://doi.org/10.11609/jott.10236.18.5.28971-28975Keywords:
Accipitridae, Accipitriformes, bioindicators, power line collisions, raptors, rock outcrop, wind turbinesAbstract
Bonelli’s Eagle (Mosaladikki; meaning hare hunter) Aquila fasciata is a top predator experiencing population declines across its range. This study presents preliminary findings from a periodic survey (April 2024–May 2025) in Sithagiri Malai, a rocky outcrop in Tamil Nadu, India. We document the presence of breeding territory, potential prey species, and discuss imminent threats, particularly from windmills, emphasising the ecological value of rocky outcrops for the species in this landscape.
References
Ali, S. & D. Ripley (1987). Compact Handbook of the Birds of India and Pakistan together with those of Bangladesh, Nepal, Bhutan and Sri Lanka. 2nd Edition. Oxford University Press, New Delhi, 737 pp.
Bharos, A.M.K. & D. Pare (2023). Probable nesting of Bonelli’s Eagle Aquila fasciata (Family Accipitridae) in a telecom tower in Khandwa district, Madhya Pradesh, India. Journal of the Bombay Natural History Society 120(2). https://doi.org/10.17087/jbnhs/2023/v120/158804
BirdLife International (2020). Bonelli’s Eagle (Aquila fasciata) – BirdLife species factsheet. http://datazone.birdlife.org/species/factsheet/bonellis-eagle-aquila-fasciata. Accessed on 15.x.2025.
Byju, H., N. Raveendran & A.J. Mathiyazhagan (2023). Powerline pylons: an unusual nesting success of White-bellied Sea-Eagle Haliaeetus leucogaster (Gmelin, 1788) (Aves: Accipitriformes: Accipitridae) from Ramanathapuram, southeastern coast of India. Journal of Threatened Taxa 15(7): 23610–23614. https://doi.org/10.11609/jott.8460.15.7.23610-23614
De Lucas, M., G.F.E. Janss, D.P. Whitfield & M. Ferrer (2008). Collision fatality of raptors in wind farms does not depend on raptor abundance. Journal of Applied Ecology 45(6): 1695–1703. https://doi.org/10.1111/j.1365-2664.2008.01549.x
Di Vittorio, M., G. Rannisi, E. Di Trapani, A. Falci, A. Ciaccio, M. Rocco, G. Giacalone, M. Zafarana, S. Grenci, G. La Grua, A. Scuderi, F. Palazzolo, S. Cacopardi, L. Luiselli & S. Merlino (2017). Positive demographic effects of nest surveillance campaigns to counter illegal harvest of the Bonelli’s Eagle in Sicily (Italy). Animal Conservation (ZSL – Let’s Work for Wildlife). https://doi.org/10.1111/acv.12381
Donázar, J.A., A. Cortés-Avizanda, J.A. Fargallo, A. Margalida, M. Moleón, Z. Morales-Reyes, R. Moreno-Opo, J.M. Pérez-García, J.A. Sánchez-Zapata, I. Zuberogoitia & D. Serrano (2016). Roles of raptors in a changing world: from flagships to providers of key ecosystem services. Ardeola 63(1): 181–234. https://doi.org/10.13157/arla.63.1.2016.rp8
Ferguson-Lees, J. & D.A. Christie (2001). Raptors of the World. Houghton Mifflin Harcourt, Boston and New York, 994 pp.
Fitzsimons, J.A. & D.R. Michael (2017). Rocky outcrops: a hard road in the conservation of critical habitats. Biological Conservation 211: 36–44. https://doi.org/10.1016/j.biocon.2016.11.019
Hernández-Matías, A., J. Real, F. Parés & R. Pradel (2015). Electrocution threatens the viability of populations of the endangered Bonelli’s Eagle (Aquila fasciata) in Southern Europe. Biological Conservation 191: 110–116. https://doi.org/10.1016/j.biocon.2015.06.028
Hernández-Matías, A., J. Real, R. Pradel, A. Ravayrol & N. Vincent-Martin (2011). Effects of age, territoriality and breeding on survival of Bonelli’s Eagle Aquila fasciata. Ibis 153(4): 846–857. https://doi.org/10.1111/j.1474-919X.2011.01158.x
Skarabal, J., M. Raab, R. Raab, M.U. Grüebler, U.G. Kormann, P. Scherler, P. Sumasgutner, S. Åkesson, A. Bermejo, N. Chakarov, W. Fiedler, A. Godino, L. Haraszthy, K. Klein, M. Kolbe, I. Literák, K. Mammen, U. Mammen, J.Y. Paquet, T. Pfeiffer, J. De La Puente, A. Resetaritz, S. van Rijn, L. Scholze, P. Spakovszky, E. Steinborn, J. Westphal, M. Wojta & R. Raab (2025). Red Kite (Milvus milvus) collision risk is higher at wind turbines with larger rotors and lower clearance, evidenced by GPS tracking. Biological Conservation 312: 111482. https://doi.org/10.1016/j.biocon.2025.111482
Kitowski, I., D. Jakubas, D. Wiącek & A. Sujak (2017). Concentrations of lead and other elements in the liver of the white-tailed eagle (Haliaeetus albicilla), a European flagship species, wintering in Eastern Poland. Ambio 46(8): 825–841. https://doi.org/10.1007/s13280-017-0929-3
Krijgsveld, K.L., K. Akershoek, F. Schenk, F. Dijk & S. Dirksen (2009). Collision risk of birds with modern large wind turbines. Ardea 97(3): 357–366. https://doi.org/10.5253/078.097.0311
Kumar, S.R., V. Anoop, P.R. Arun, R. Jayapal & A.M.S. Ali (2019). Avian mortalities from two wind farms at Kutch, Gujarat and Davangere, Karnataka, India. Current Science 116(9): 1587–1592. https://www.jstor.org/stable/27138080
Kumar, S.R., P.R. Arun & A.M.S Ali (2022). Effects of wind farm on land bird composition at Kachchh District, Gujarat, India. Journal of Threatened Taxa 14(9): 21826–21835. https://doi.org/10.11609/jott.4793.14.9.21826-21835
Manigandan, S., P. Kannan, H. Byju, S. Bharathidasan, C. Thambi & B. Ramakrishnan (2022). Death of a Himalayan Vulture in South India highlights the potential threat of power infrastructure. Vulture News 80(1): 20–22. https://doi.org/10.4314/vulnew.v80i1.3
McClure, C.J.W., J.R.S. Westrip, J.A. Johnson, S.E. Schulwitz, M.Z. Virani, R. Davies, A. Symes, H. Wheatley, R. Thorstrom, A. Amar, R. Buij, V.R. Jones, N.P. Williams, E.R. Buechley & S.H.M. Butchart (2018). State of the world’s raptors: distributions, threats, and conservation recommendations. Biological Conservation 227: 390–402. https://doi.org/10.1016/j.biocon.2018.08.012
Ontiveros, D. (1999). Selection of nest cliffs by Bonelli’s Eagle (Hieraaetus fasciatus) in Southeastern Spain. Journal of Raptor Research 33(2): 110–116.
Rasmussen, P.C. & J.C. Anderton (2012). Birds of South Asia. The Ripley Guide. 2 Volumes. 2nd Edition. National Museum of Natural History – Smithsonian Institution, Michigan State University and Lynx Edicions, Washington D.C., Michigan and Barcelona.
Smallwood, K.S. & C.G. Thelander (2008). Bird mortality in the Altamont Pass Wind Resource Area, California. The Journal of Wildlife Management 72: 215–223. https://doi.org/10.2193/2007-032
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