Anthropogenic Sources of Non-Migratory Avian Mortalities In Singapore

David J. X. TAN, Ding Li YONG, Bing Wen LOW, Alan OWYONG, Alfred CHIA


Although urban spaces are increasingly recognised as viable habitats for wildlife, cities remain a major source of anthropogenic mortality for wild birds. While the sources of urban avian mortalities have been well documented in North America, these phenomena remain poorly studied in Southeast Asia, especially for resident species. Here we present the first summary of non-migratory urban bird mortalities for the heavily urbanised island of Singapore. We conducted a citizen science study using print and social media outreach to encourage members of the public to report their observations of dead birds between November 2013 and October 2017, and collected a total of 362 mortality records across 65 resident bird species and five mortality sources. Our results show that a diverse array of bird species is directly impacted by anthropogenic sources of mortality, although mortalities stemming from roadkill and cat predation are likely to be undersampled. We also find that forest-edge frugivores such as the Pink-necked Green Pigeon are likely to be especially vulnerable to building collisions. Our study shows that despite its limitations, opportunistic sampling using citizen science can generate large amounts of ecological data at relatively low cost, and serve as a cost-effective complement to standardised survey methodologies.


bird mortality, building collisions, urban ecology, cats, human impacts, roadkill, citizen science

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Agudelo-Álvarez, L., Moreno-Velasquez, J., Ocampo-Peñuela, N., 2010. Colisiones de aves contra ventanales en un campus universitario de bogotá, colombia. Ornitol. Colomb. 10, 3–10.

Arnold, T.W., Zink, R.M., 2011. Collision mortality has no discernible effect on population trends of North American birds. PLoS One 6, 1–6.

Brisque, T., Campos-Silva, L.A., Piratelli, A.J., 2017. Relationship between bird-of-prey decals and bird-window collisions on a Brazilian university campus. Zoologia 34, 1–8.

Calvert, A.M., Bishop, C. a, Elliot, R.D., Krebs, E. a, Kydd, T.M., Machtans, C.S., Robertson, G.J., 2013. A Synthesis of Human-related Avian Mortality in Canada. Avian Conserv. Ecol. 8, 11.

Castelletta, M., Thiollay, J.-M., Sodhi, N.S., 2005. The effects of extreme forest fragmentation on the bird community of Singapore Island. Biol. Conserv. 121, 135–155.

Chan, L., Hillel, O., Elmqvist, T., Werner, P., Holman, N., Mader, A., Calcaterra, E., 2014. USER ’ S MANUAL ON THE SINGAPORE INDEX ON CITIES ’ BIODIVERSITY ( also known as the City Biodiversity Index ). National Parks Board, Singapore, Singapore.

Dickinson, J.L., Zuckerberg, B., Bonter, D.N., 2010. Citizen Science as an Ecological Research Tool: Challenges and Benefits. Annu. Rev. Ecol. Evol. Syst. 41, 149–172.

Eaton, J.A., van Balen, B., Brickle, N.W., Rheindt, F.E., 2016. Birds of the Indonesian Archipelago: Greater Sundas and Wallacea, First. ed. Lynx Edicions, Barcelona.

Feng, Z., 2013. Team flocks to collect dead birds for research. The Straits Times.

Jarvis, E.D., Mirarab, S., Aberer, A.J., Li, B., Houde, P., Li, C., Ho, S.Y.W., Faircloth, B.C., Nabholz, B., Howard, J.T., Suh, A., Weber, C.C., da Fonseca, R.R., Li, J., Zhang, F., Li, H., Zhou, L., Narula, N., Liu, L., Ganapathy, G., Boussau, B., Bayzid, M.S., Zavidovych, V., Subramanian, S., Gabaldon, T., Capella-Gutierrez, S., Huerta-Cepas, J., Rekepalli, B., Munch, K., Schierup, M., Lindow, B., Warren, W.C., Ray, D., Green, R.E., Bruford, M.W., Zhan, X., Dixon, A., Li, S., Li, N., Huang, Y., Derryberry, E.P., Bertelsen, M.F., Sheldon, F.H., Brumfield, R.T., Mello, C. V., Lovell, P. V., Wirthlin, M., Schneider, M.P.C., Prosdocimi, F., Samaniego, J.A., Velazquez, A.M. V., Alfaro-Nunez, A., Campos, P.F., Petersen, B., Sicheritz-Ponten, T., Pas, A., Bailey, T., Scofield, P., Bunce, M., Lambert, D.M., Zhou, Q., Perelman, P., Driskell, A.C., Shapiro, B., Xiong, Z., Zeng, Y., Liu, S., Li, Z., Liu, B., Wu, K., Xiao, J., Yinqi, X., Zheng, Q., Zhang, Y., Yang, H., Wang, J., Smeds, L., Rheindt, F.E., Braun, M., Fjeldsa, J., Orlando, L., Barker, F.K., Jonsson, K.A., Johnson, W., Koepfli, K.-P., O’Brien, S., Haussler, D., Ryder, O.A., Rahbek, C., Willerslev, E., Graves, G.R., Glenn, T.C., McCormack, J., Burt, D., Ellegren, H., Alstrom, P., Edwards, S. V., Stamatakis, A., Mindell, D.P., Cracraft, J., Braun, E.L., Warnow, T., Jun, W., Gilbert, M.T.P., Zhang, G., 2014. Whole-genome analyses resolve early branches in the tree of life of modern birds. Science (80-. ). 346, 1320–1331.

Kahle, L.Q., Flannery, M.E., Dumbacher, J.P., 2016. Bird-Window Collisions at a West-Coast Urban Park Museum: Analyses of Bird Biology and Window Attributes from Golden Gate Park, San Francisco. PLoS One 11, e0144600.

Klem, D., 2015. Bird-Window Collisions: A Critical Animal Welfare and Conservation Issue. Appl. Anim. Welf. Sci. 18, S11–S17.

Klem, D., 2014. Landscape, Legal, and Biodiversity Threats that Windows Pose to Birds: A Review of an Important Conservation Issue. Land 3, 351–361.

Klem, D., 1989. Bird-window collisions. Wilson Bull. 4, 606–620.

Kociolek, A. V., Clevenger, A.P., St. Clair, C.C., Proppe, D.S., 2011. Effects of Road Networks on Bird Populations. Conserv. Biol. 25, 241–249.

Lepczyk, C.A., Mertig, A.G., Liu, J., 2004. Landowners and cat predation across rural-to-urban landscapes. Biol. Conserv. 115, 191–201.

Lim, K.S., 2009. The Avifauna of Singapore. Nature Society (Singapore), Singapore.

Loss, S.R., Will, T., Loss, S.S., Marra, P.P., 2014. Bird–building collisions in the United States: Estimates of annual mortality and species vulnerability. Condor 116, 8–23.

Loss, S.R., Will, T., Marra, P.P., 2015. Direct Mortality of Birds from Anthropogenic Causes. Annu. Rev. Ecol. Evol. Syst. 46, 99–120.

Loss, S.R., Will, T., Marra, P.P., 2013. The impact of free-ranging domestic cats on wildlife of the United States. Nat. Commun. 4, 1396.

Low, B.W., Yong, D.L., Tan, D., Owyong, A., Chia, A., 2017. Migratory bird collisions with man-made structures in South-East Asia : a case study from Singapore. BirdingASIA 27, 107–111.

Tan, D.J.X., 2016. A quantitative survey of avian population densities in a heterogeneous tropical urban landscape. Raffles Bull. Zool. 2016.

Tan, D.J.X., 2015. Population Dynamics of the Striped Tit-Babbler in Singapore. National University of Singapore.

United Nations, Department of Economic and Social Affairs, P.D., 2015. World urbanization prospects. United Nations, New York.

Woinarski, J.C.Z., Murphy, B.P., Legge, S.M., Garnett, S.T., Lawes, M.J., Comer, S., Dickman, C.R., Doherty, T.S., Edwards, G., Nankivell, A., Paton, D., Palmer, R., Woolley, L.A., 2017. How many birds are killed by cats in Australia? Biol. Conserv. 214, 76–87.

Yee, A.T.K., Corlett, R.T., Liew, S.C., Tan, H.T.W., 2011. The vegetation of Singapore ― an updated map. Gard. Bull. Singapore 63, 205–212.



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Copyright© 2016 | ISSN: 2503-4715 

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The Faculty of Veterinary Medicine of Syiah Kuala University
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Center for Tropical Veterinary Studies of Syiah Kuala University
and Indonesian Veterinary Medical Association (PDHI)

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