Flight heights in ibis and spoonbills: implications for collision risk
Batbayar Galtbalt A , Heather M. McGinness
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Handling Editor: Shannon Dundas
Abstract
Millions of birds worldwide have become victims of airspace collisions with aircraft, wind turbines, power lines and other infrastructure. Mobile bird species using grassland, agricultural and urban habitats are at higher risk, including large wading waterbird species such as ibis, spoonbills, egrets and herons that are priorities for conservation.
This work aimed to improve understanding of ibis and spoonbill flight characteristics as a first step in assessing species vulnerability to collision, and developing risk mitigation.
We used high-accuracy GPS telemetry data to quantify (a) flight heights of three aggregate-nesting waterbird species, i.e. straw-necked ibis (Threskiornis spinicollis), Australian white ibis (T. molucca) and royal spoonbill (Platalea regia), and (b) variations in flight heights and modes in relation to atmospheric conditions for straw-necked ibis as a focal species.
Across all species and movements, flights mostly occurred at heights of between 150 and 550 m above ground level (AGL). Long-distance movements by straw-necked ibis reached a maximum height of 2800 m AGL; however, most flights (75%) occurred below 1000 m. Soaring and gliding were driven by the intensity of thermal uplifts and associated with longer-distance flight legs. Where thermal uplift was absent, birds flapped at relatively low and constant heights compared to when uplift was present. For straw-necked ibis, 29% of all flight fixes were in the rotor swift zone of wind turbines (20–250 m), but this figure increased to 53% if only flapping flights were considered. Flight heights broadly overlapped with general aviation zones, notably during aircraft take-off and landing phases.
There are clearly collision risks associated with wind turbines and aircraft flight zones when considering the flight characteristics and ecology of large aggregate-nesting waterbirds such as ibis and spoonbills.
When assessing spatially and temporally explicit scenarios of risk for such species, we suggest that several factors should be considered, including (a) atmospheric, weather and seasonal conditions, (b) common routes or flyways used during long-distance movements, (c) the locations of important nesting sites and associated foraging sites, (d) the locations of important stopover and overwintering sites, and (e) the timing of flights.
Keywords: aircraft, atmospheric condition, flapping, gliding, soaring, thermal uplift, turbine, waterbird.
References
Andrews R, Bevrani B, Colin B, Wynn MT, Ter Hofstede AHM, Ring J (2022) Three novel bird strike likelihood modelling techniques: the case of Brisbane Airport, Australia. PLoS ONE 17(12), e0277794.
| Crossref | Google Scholar | PubMed |
Arrondo E, García Alfonso M, Blas J, Cortés-Avizanda A, De la Riva M, DeVault TL, Fiedler W, Flack A, Jimenez J, Lambertucci SA, Margalida A, Oliva-Vidal P, Phipps L, Sánchez-Zapata JA, Wikelski M, Donázar JA (2021) Use of avian GPS tracking to mitigate human fatalities from bird strikes caused by large soaring birds. Journal of Applied Ecology 58(7), 1411-1420.
| Crossref | Google Scholar |
Australian Transport Safety Bureau (2019) Australian aviation wildlife strike statistics 2008–2017. ATSB Transport Safety Report Research Report AR-2018-035. (Commonwealth of Australia: Canberra, ACT, Australia) Available at https://www.atsb.gov.au/publications/2018/ar-2018-035
Bergen S, Huso MM, Duerr AE, Braham MA, Katzner TE, Schmuecker S, Miller TA (2022) Classifying behavior from short-interval biologging data: an example with GPS tracking of birds. Ecology and Evolution 12(2), e08395.
| Crossref | Google Scholar |
Beston JA, Diffendorfer JE, Loss SR, Johnson DH (2016) Prioritizing avian species for their risk of population-level consequences from wind energy development. PLoS ONE 11(3), e0150813.
| Crossref | Google Scholar | PubMed |
Bino G, Brandis K, Kingsford RT, Porter J (2021) Shifting Goalposts: setting restoration targets for waterbirds in the Murray–Darling basin under climate change. Frontiers in Environmental Science 9, 785903.
| Crossref | Google Scholar |
Blackwell BF, Schafer LM, Helon DA, Linnell MA (2008) Bird use of stormwater-management ponds: decreasing avian attractants on airports. Landscape and Urban Planning 86(2), 162-170.
| Crossref | Google Scholar |
Blackwell BF, Seamans TW, Schmidt PM, De Vault TL, Belant JL, Whittingham MJ, Martin JA, Fernández-Juricic E (2013) A framework for managing airport grasslands and birds amidst conflicting priorities. Ibis 155(1), 199-203.
| Crossref | Google Scholar |
Bohrer G, Brandes D, Mandel JT, Bildstein KL, Miller TA, Lanzone M, Katzner T, Maisonneuve C, Tremblay JA (2012) Estimating updraft velocity components over large spatial scales: contrasting migration strategies of golden eagles and turkey vultures. Ecology Letters 15(2), 96-103.
| Crossref | Google Scholar | PubMed |
Brandis KJ, Bino G, Spencer JA, Ramp D, Kingsford RT (2018) Decline in colonial waterbird breeding highlights loss of Ramsar wetland function. Biological Conservation 225, 22-30.
| Crossref | Google Scholar |
Byrne ME, Holland AE, Bryan AL, Beasley JC (2017) Environmental conditions and animal behavior influence performance of solar-powered GPS-GSM transmitters. The Condor: Ornithological Applications 119(3), 389-404.
| Crossref | Google Scholar |
Chelak MS, Kohl MT, Small JR, Smith KT, Pratt AC, Beck JL, Backen CR, Flack MB, Wayment HP, Wood JA, Howell R, Strange TD, McDonald LR, Manlove KR, Frey SN, Larsen RT, Maxfield BA, Dahlgren DK, Messmer T, Stoner DC (2025) Refurbishing used GPS transmitters improves performance for subsequent deployments on greater sage-grouse. Wildlife Society Bulletin 49(1), e1566.
| Crossref | Google Scholar |
Civil Aviation Safety Authority (2024) Part 91 of CASR general operating and flight rules. (Commonwealth of Australia) Available at https://www.casa.gov.au/rules/regulatory-framework/casr/part-91-casr-general-operating-and-flight-rules#Rulestatus [Verified 25 September 2024]
Conkling TJ, Vander Zanden HB, Allison TD, Diffendorfer JE, Dietsch TV, Duerr AE, Fesnock AL, Hernandez RR, Loss SR, Nelson DM, Sanzenbacher PM, Yee JL, Katzner TE (2022) Vulnerability of avian populations to renewable energy production. Royal Society Open Science 9(3), 211558.
| Crossref | Google Scholar | PubMed |
Department of Transport and Planning (2024) Wind energy facilities: supporting development of renewable energy as an important contributor to Victoria’s future energy needs. (State Government of Victoria) Available at https://www.planning.vic.gov.au/guides-and-resources/guides/all-guides/renewable-energy-facilities/wind-energy-facilities [Verified 25 September 2024]
DeVault TL, Blackwell BF, Seamans TW, Belant JL (2016) Identification of off airport interspecific avian hazards to aircraft. The Journal of Wildlife Management 80(4), 746-752.
| Crossref | Google Scholar |
DeVault TL, Blackwell BF, Seamans TW, Begier MJ, Kougher JD, Washburn JE, Miller PR, Dolbeer RA (2018) Estimating interspecific economic risk of bird strikes with aircraft. Wildlife Society Bulletin 42(1), 94-101.
| Crossref | Google Scholar |
Dolbeer RA (2006) Height Distribution of Birds Recorded by Collisions with Civil Aircraft. Journal of Wildlife Management 70(5), 1345-1350.
| Crossref | Google Scholar |
Dormann CF, Elith J, Bacher S, Buchmann C, Carl G, Carré G, Marquéz JRG, Gruber B, Lafourcade B, Leitão PJ, Münkemüller T, McClean C, Osborne PE, Reineking B, Schröder B, Skidmore AK, Zurell D, Lautenbach S (2013) Collinearity: a review of methods to deal with it and a simulation study evaluating their performance. Ecography 36(1), 27-46.
| Crossref | Google Scholar |
Duriez O, Peron G, Gremillet D, Sforzi A, Monti F (2018) Migrating ospreys use thermal uplift over the open sea. Biology Letters 14, 20180687.
| Crossref | Google Scholar | PubMed |
Erickson WP, Johnson GD, Young DP Jr (2005) A summary and comparison of bird mortality from anthropogenic causes with an emphasis on collisions. In ‘Bird conservation implementation and integration in the americas: proceedings of the third international partners in flight conference’, 20–24 March 2002, Asilomar, CA, USA. (Eds CJ Ralph, TD Rich) Volume 2, General Technical Report PSW-GTR-191, pp. 1029–1042. (USDA Forest Service, Pacific Southwest Research Station)
Ferraz G, Pacheco C, Fernández-Tizón M, Marques AT, Alves PC, Silva JP, Mougeot F (2024) Using GPS and accelerometer data to remotely detect breeding events in two elusive ground-nesting steppe birds. Animal Biotelemetry 12(1), 30.
| Crossref | Google Scholar |
Gauld JG, Silva JP, Atkinson PW, Record P, Acácio M, Arkumarev V, Blas J, Bouten W, Burton N, Catry I, Champagnon J, Clewley GD, Dagys M, Duriez O, Exo K-M, Fiedler W, Flack A, Friedemann G, Fritz J, Garcia-Ripolles C, Garthe S, Giunchi D, Grozdanov A, Harel R, Humphreys EM, Janssen R, Kölzsch A, Kulikova O, Lameris TK, López-López P, Masden EA, Monti F, Nathan R, Nikolov S, Oppel S, Peshev H, Phipps L, Pokrovsky I, Ross-Smith VH, Saravia V, Scragg ES, Sforzi A, Stoynov E, Thaxter C, Van Steelant W, Van Toor M, Vorneweg B, Waldenström J, Wikelski M, Žydelis R, Franco AMA (2022) Hotspots in the grid: avian sensitivity and vulnerability to collision risk from energy infrastructure interactions in Europe and North Africa. Journal of Applied Ecology 59(6), 1496-1512.
| Crossref | Google Scholar |
Gawne B, Thompson R (2023) Adaptive water management in response to climate change: the case of the southern Murray–Darling Basin. Australasian Journal of Water Resources 27(2), 271-288.
| Crossref | Google Scholar |
Hedenström A, Alerstam T (1995) Optimal flight speed of birds. Philosophical Transactions of the Royal Society of London – B. Biological Sciences 348, 471-487.
| Crossref | Google Scholar |
Hersbach H, Bell B, Berrisford P, Hirahara S, Horányi A, Muñoz-Sabater J, Nicolas J, Peubey C, Radu R, Schepers D, Simmons A, Soci C, Abdalla S, Abellan X, Balsamo G, Bechtold P, Biavati G, Bidlot J, Bonavita M, De Chiara G, Dahlgren P, Dee D, Diamantakis M, Dragani R, Flemming J, Forbes R, Fuentes M, Geer A, Haimberger L, Healy S, Hogan RJ, Hólm E, Janisková M, Keeley S, Laloyaux P, Lopez P, Lupu C, Radnoti G, De Rosnay P, Rozum I, Vamborg F, Villaume S, Thépaut J-N (2020) The ERA5 global reanalysis. Quarterly Journal of the Royal Meteorological Society 146(730), 1999-2049.
| Crossref | Google Scholar |
Jirinec V, Rodrigues PF, Amaral B (2021) Adjustable leg harness for attaching tags to small and medium-sized birds. Journal of Field Ornithology 92(1), 77-87.
| Crossref | Google Scholar |
Kamata T, Sato H, Mukai H, Sato T, Yamada S, Sekijima T (2023) Sensitivity analysis of collision risk at wind turbines based on flight altitude of migratory waterbirds. Ecological Solutions and Evidence 4(2), e12222.
| Crossref | Google Scholar |
Karl BJ, Clout MN (1987) An improved radio transmitter harness with a weak link to prevent snagging. Journal of Field Ornithology 58(1), 73-77.
| Google Scholar |
Kirby JS, Stattersfield AJ, Butchart SHM, Evans MI, Grimmett RFA, Jones VR, O’Sullivan J, Tucker GM, Newton I (2008) Key conservation issues for migratory land- and waterbird species on the world’s major flyways. Bird Conservation International 18(S1), S49-S73.
| Crossref | Google Scholar |
Lato KA, Stepanuk JEF, Heywood EI, Conners MG, Thorne LH (2022) Assessing the accuracy of altitude estimates in avian biologging devices. PLoS ONE 17(10), e0276098.
| Crossref | Google Scholar | PubMed |
Loss SR, Will T, Marra PP (2014a) Estimation of bird–vehicle collision mortality on US roads. The Journal of Wildlife Management 78(5), 763-771.
| Crossref | Google Scholar |
Loss SR, Will T, Marra PP (2014b) Refining estimates of bird collision and electrocution mortality at power lines in the United States. PLoS ONE 9(7), e101565.
| Crossref | Google Scholar |
Martin J, French K, Major R (2010) Population and breeding trends of an urban coloniser: the Australian white ibis. Wildlife Research 37(3), 230-239.
| Crossref | Google Scholar |
McGinness HM, Lloyd-Jones LR, Robinson F, Langston A, O’Neill LG, Rapley S, Jackson MV, Hodgson J, Piper M, Davies M, Martin J, Kingsford R, Brandis K, Doerr V, Mac Nally RM (2024a) Satellite telemetry reveals complex mixed movement strategies in ibis and spoonbills of Australia: implications for water and wetland management. Movement Ecology 12, 74.
| Google Scholar |
McGinness HM, Lloyd-Jones LR, Robinson F, Langston A, O’Neill LG, Rapley S, Jackson MV, Hodgson J, Piper M, Davies M, Martin J, Kingsford R, Brandis K, Doerr V, Mac Nally RM (2024b) Habitat use by nomadic ibis and spoonbills post-dispersal from breeding sites. Landscape Ecology 39, 189.
| Crossref | Google Scholar |
McGinness HM, Jackson MV, Lloyd-Jones L, Robinson F, Langston A, O’Neill LG, Rapley S, Piper M, Davies M, Hodgson J, Martin JM, Kingsford R, Brandis K, Doerr V, Mac Nally R (2024c) Extensive tracking of nomadic waterbird movements reveals an inland flyway. Ecology and Evolution 14(12), e70668.
| Crossref | Google Scholar |
McGinness HM, Lloyd-Jones L, Robinson F, Jackson M, Rapley S, O’Neill L (2024d) Satellite tracking waterbird movements in the Murray–Darling basin. A report to the Commonwealth Environmental Water Holder (CEWH) monitoring, evaluation and research program, department of agriculture, water and the environment. CSIRO, Canberra, ACT, Australia.
Morant J, Arrondo E, Sánchez-Zapata JA, Donázar JA, Margalida A, Carrete M, Blanco G, Guil F, Serrano D, Pérez-García JM (2024) Fine-scale collision risk mapping and validation with long-term mortality data reveal current and future wind energy development impact on sensitive species. Environmental Impact Assessment Review 104, 107339.
| Crossref | Google Scholar |
Murray–Darling Basin Authority (2019) Basin-wide environmental watering strategy. (MDBA: Canberra, ACT, Australia) Available at https://www.mdba.gov.au/water-use/water-environment/water-environment-your-region/deciding-where-water-goes/basin-wide-environmental
Murray–Darling Basin Authority (2020) 2020 Basin Plan evaluation. (MDBA: Canberra, ACT, Australia) Available at https://www.mdba.gov.au/water-management/basin-plan/basin-plan-evaluations/2020-basin-plan-evaluation
Nicol S, Lloyd-Jones L, McGinness HM (2024) A method to predict connectivity for nomadic waterbird species from tracking data. Landscape Ecology 39, 13.
| Crossref | Google Scholar |
Péron G, Fleming CH, Duriez O, Fluhr J, Itty C, Lambertucci S, Safi K, Shepard EL, Calabrese JM (2017) The energy landscape predicts flight height and wind turbine collision hazard in three species of large soaring raptor. Journal of Applied Ecology 54(6), 1895-1906.
| Crossref | Google Scholar |
Pfeiffer MB, Kougher JD, DeVault TL (2018) Civil airports from a landscape perspective: a multi-scale approach with implications for reducing bird strikes. Landscape and Urban Planning 179, 38-45.
| Crossref | Google Scholar |
Roshier DA, Asmus MW (2009) Use of satellite telemetry on small-bodied waterfowl in Australia. Marine and Freshwater Research 60(4), 299-305.
| Crossref | Google Scholar |
Sachs G, Traugott J, Nesterova AP, Dell’Omo G, Kümmeth F, Heidrich W, Vyssotski AL, Bonadonna F (2012) Flying at no mechanical energy cost: disclosing the secret of wandering albatrosses. PLoS ONE 7, e41449.
| Crossref | Google Scholar | PubMed |
Safi K, Kranstauber B, Weinzierl R, Griffin L, Rees EC, Cabot D, Cruz S, Proaño C, Takekawa JY, Newman SH, Waldenström J, Bengtsson D, Kays R, Wikelski M, Bohrer G (2013) Flying with the wind: scale dependency of speed and direction measurements in modelling wind support in avian flight. Movement Ecology 1, 4.
| Crossref | Google Scholar |
Schaub T, Millon A, De Zutter C, Buij R, Chadoeuf J, Lee S, Mionnet A, Klaassen RHG (2023) How to improve the accuracy of height data from bird tracking devices? An assessment of high-frequency GPS tracking and barometric altimetry in field conditions. Animal Biotelemetry 11(1), 31.
| Crossref | Google Scholar |
Smith ACM, Munro U, Figueira WF (2013) Modelling urban populations of the Australian white ibis (Threskiornis molucca) to inform management. Population Ecology 55(4), 567-574.
| Crossref | Google Scholar |
Sodhi NS (2002) Competition in the air: birds versus aircraft. The Auk 119(3), 587-595.
| Crossref | Google Scholar |
Thaxter CB, Ross-Smith VH, Clark JA, Clark NA, Conway GJ, Marsh M, Leat EHK, Burton NHK (2014) A trial of three harness attachment methods and their suitability for long-term use on Lesser Black-backed Gulls and Great Skuas. Ringing & Migration 29(2), 65-76.
| Crossref | Google Scholar |
Thaxter CB, Buchanan GM, Carr J, Butchart SHM, Newbold T, Green RE, Tobias JA, Foden WB, O’Brien S, Pearce-Higgins JW (2017) Bird and bat species’ global vulnerability to collision mortality at wind farms revealed through a trait-based assessment. Proceedings of the Royal Society of London – B. Biological Sciences 284(1862), 20170829.
| Crossref | Google Scholar |
Watts HE, Cornelius JM, Fudickar AM, Perez J, Ramenofsky M (2018) Understanding variation in migratory movements: a mechanistic approach. General and Comparative Endocrinology 256, 112-122.
| Crossref | Google Scholar | PubMed |
Weiser EL, Overton CT, Douglas DC, Casazza ML, Flint PL (2024) Geese migrating over the Pacific Ocean select altitudes coinciding with offshore wind turbine blades. Journal of Applied Ecology 61(5), 951-962.
| Crossref | Google Scholar |