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Invasion of Psittacula krameri in Gauteng, South Africa: are other birds impacted?

  • Ielyzaveta M. IvanovaEmail author
  • Craig T. Symes
Original Paper
Part of the following topical collections:
  1. Invasive species

Abstract

Anthropogenic activities have resulted in the dispersal of many species beyond their natural range and there is ongoing concern over their impacts on native ecosystems. However, these interactions are hard to disentangle from the effect of human-driven habitat alterations. Psittacula krameri (Rose-ringed Parakeet) is a recent coloniser in the heavily modified province of Gauteng, South Africa. We analysed this species across the region to assess its colonising status and potential impact to-date. Using presence data from the Second Southern African Bird Atlas Project (SABAP2) for the parakeet as well as a selected subgroup of 49 other bird species (potential competitor and control species), occurrence patterns in the province for the period of July 2007–June 2017 were determined. Reporting rates for species in SABAP2 were used as a proxy for relative abundance. While the parakeet’s range and abundance increased significantly, only two species showed a significant reporting rate decline in areas of parakeet occurrence. These declines persisted across a wider area where parakeets were not found. Broader-scale Gauteng reporting rate trends, not replicated in the parakeet range, were noted for nine other species, suggesting that the changing avifaunal composition in the anthropogenically transformed Gauteng may instead be driven by habitat change. A large proportion of species can be considered as newcomers to this largely modified ecosystem, and the possibility of vacant niche filling is strong in this case. In the context of novel ecosystems such as urban areas, a terminology based on adaptability rather than nativity status is encouraged.

Keywords

Psittacula krameri Species invasions Gauteng, South Africa Species interactions Nativity 

Notes

Acknowledgements

We would like to acknowledge the ongoing contribution of a large number of observers to the SABAP2 database, whose work made possible the data used in this study.

References

  1. Ahmad S, Khan HA, Javed M, Ur-Rehman K (2011) Roost composition and damage assessment of rose-ringed parakeet (Psittacula krameri) on maize and sunflower in agro-ecosystem of Central Punjab, Pakistan. Int J Agric Biol 13:731–736Google Scholar
  2. Andersen MC, Adams H, Hope B, Powell M (2004) Risk analysis for invasive species: general framework and research needs. Risk Anal 24:893–900CrossRefPubMedGoogle Scholar
  3. BirdLife International (2016) Psittacula krameri. The IUCN Red List of threatened species 2016: e.T22685441A93073464. http://doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22685441A93073464.en. Downloaded on 26 February 2017
  4. Brooke RK (1997) Rose-ringed Parakeet. In: Harrison JA, Allan DG, Underhill LG, Herremans M, Tree AJ, Parker V, Brown CJ (eds) The atlas of Southern African birds, vol 1. BirdLife South Africa, Johannesburg, p 536Google Scholar
  5. Butler CJ (2003) Population biology of the introduced rose-ringed parakeet Psittacula krameri in the UK. PhD thesis, University of Oxford, OxfordGoogle Scholar
  6. Butler CJ, Cresswell W, Gosler A, Perrins C (2013) The breeding biology of Rose-ringed Parakeets Psittacula krameri in England during a period of rapid population expansion. Bird Study 60:527–532CrossRefGoogle Scholar
  7. Byers JE (2002) Impact of non-indigenous species on natives enhanced by anthropogenic alteration of selection regimes. Oikos 97:449–458CrossRefGoogle Scholar
  8. Carrete M, Lambertucci SA, Speziale K, Ceballos O, Travaini A, Delibes M, Hiraldo F, Donázar JA (2010) Winners and losers in human-made habitats: interspecific competition outcomes in two Neotropical vultures. Anim Conserv 13:390–398CrossRefGoogle Scholar
  9. Chapman T (2005) The status and impact of the rainbow lorikeet (Trichoglossus haematodus moluccanus) in South-Western Australia. Miscellaneous Publication, Department of Agriculture, Government of Western Australia, 4/2005. p 25Google Scholar
  10. Charter M, Izhaki I, Mocha YB, Kark S (2016) Nest-site competition between invasive and native cavity nesting birds and its implication for conservation. J Environ Manag 181:129–134CrossRefGoogle Scholar
  11. Clavero M, García-Berthou E (2005) Invasive species are a leading cause of animal extinctions. Trends Ecol Evol 20:110CrossRefPubMedGoogle Scholar
  12. Clavero M, Brotons L, Pons P, Sol D (2009) Prominent role of invasive species in avian biodiversity loss. Biol Conserv 142:2043–2049CrossRefGoogle Scholar
  13. Clergeau P, Croci S, Jokimäki J, Kaisanlahti-Jokimäki M, Dinetti M (2006) Avifauna homogenisation by urbanisation: analysis of different European latitudes. Biol Conserv 127:336–344CrossRefGoogle Scholar
  14. Craig A, Feare C (2010) Starlings and mynas. Christopher Helm Publishers, London, p 228Google Scholar
  15. Crooks JA, Soulé ME (1999) Lag times in population explosions of invasive species: causes and implications. In: Sandlund OT, Schei PJ, Viken A (eds) Invasive species and biodiversity management. Kluwer Academic Publishers, Dordrecht, pp 103–125CrossRefGoogle Scholar
  16. Cunningham SJ, Madden CF, Barnard P, Amar A (2016) Electric crows: powerlines, climate change and the emergence of a native invader. Divers Distrib 22:17–29CrossRefGoogle Scholar
  17. Czajka C, Braun MP, Wink M (2011) Resource use by non-native rose-ringed parakeets (Psittacula krameri) and native starlings (Sturnus vulgaris) in central Europe. Open Ornithol J 4:17–22CrossRefGoogle Scholar
  18. Dangoisse G (2009) Étude de la population de Conures veuves (Myiopsitta monachus) de Bruxelles-Capitale. Aves 46:57–69Google Scholar
  19. Dean WRJ (2000) Alien birds in southern Africa: what factors determine success? S Afr J Sci 96:9–14Google Scholar
  20. Department of Environmental Affairs (2016) National Land Cover 2013–2014. Environmental Geographical Information Systems (E-GIS), https://egis.environment.gov.za/data_egis. Downloaded on 9 June 2017
  21. Dhindsa MS, Saini HK (1994) Agricultural ornithology: an Indian perspective. J Biosci 19:391–402CrossRefGoogle Scholar
  22. Didham RK, Tylianakis JM, Hutchison MA, Ewers RM, Gemmell NJ (2005) Are invasive species the drivers of ecological change? Trends Ecol Evol 20:470–474CrossRefPubMedGoogle Scholar
  23. Dodaro G, Battisti C (2014) Rose-ringed parakeet (Psittacula krameri) and starling (Sturnus vulgaris) syntopics in a Mediterranean urban park: evidence for competition in nest-site selection? Belg J Zool 144:5–14Google Scholar
  24. Duncan RP, Bomford M, Forsyth DM, Conibear L (2001) High predictability in introduction outcomes and the geographical range size of introduced Australian birds: a role for climate. J Anim Ecol 70:621–632CrossRefGoogle Scholar
  25. Environmental Systems Research Institute (ESRI) (2015) ArcGIS desktop: release 10.3.1. Environmental Systems Research Institute, Redlands, CAGoogle Scholar
  26. Goddard MA, Dougill AJ, Benton TG (2009) Scaling up from gardens: biodiversity conservation in urban environments. Trends Ecol Evol 25:90–98CrossRefPubMedGoogle Scholar
  27. Grarock K, Tidemann CR, Wood JT, Lindenmayer DB (2014) Are invasive species drivers of native species decline or passengers of habitat modification? A case study of the impact of the common myna (Acridotheres tristis) on Australian bird species. Austral Ecol 39:106–114CrossRefGoogle Scholar
  28. Greenwood JJD (2007) Citizens, science and bird conservation. J Ornithol 148(Supplement 1):S77–S124CrossRefGoogle Scholar
  29. Grimm NB, Grove JM, Pickett STA, Redman CL (2000) Integrated approaches to long-term studies of urban ecological systems. Bioscience 50:571–584CrossRefGoogle Scholar
  30. Gu W, Swihart RK (2004) Absent or undetected? Effects of non-detection of species occurrence on wildlife-habitat models. Biol Conserv 116:195–203CrossRefGoogle Scholar
  31. Gurevitch J, Padilla DK (2004) Are invasive species a major cause of extinctions? Trends Ecol Evol 19:470–474CrossRefPubMedGoogle Scholar
  32. Harrison JA, Underhill LG (1997) Introduction and methods. In Harrison JA, Allan DG, Underhill LG, Herremans M, Tree AJ (eds) The Atlas of Southern African birds, vol 1. BirdLife South Africa, Johannesburg, pp XLIII–LXIVGoogle Scholar
  33. Harrison JA, Underhill LG, Barnard P (2008) The seminal legacy of the Southern African Bird Atlas Project. S Afr J Sci 104:82–84Google Scholar
  34. Hart LA, Downs CT (2014) Public surveys of rose-ringed parakeets, Psittacula krameri, in the Durban Metropolitan Area, South Africa. Afr Zool 49:283–289CrossRefGoogle Scholar
  35. Hernández-Brito D, Carrete M, Popa-Lisseanu AG, Ibáñez C, Tella JL (2014) Crowding in the city: losing and winning competitors of an invasive bird. PLoS ONE.  https://doi.org/10.1371/journal.pone.0100593 CrossRefPubMedPubMedCentralGoogle Scholar
  36. Hobbs RJ (2018) Novel ecosystems: can’t we just pretend they’re not there? In: Kareiva P, Marvier M, Silliman B (eds) Effective conservation science: data not dogma. Oxford University Press, Oxford, pp 45–50Google Scholar
  37. Hobbs RJ, Higgs E, Harris JA (2009) Novel ecosystems: implications for conservation and restoration. Trends Ecol Evol 24:599–605CrossRefPubMedGoogle Scholar
  38. Hofmeyr SD, Symes CT, Underhill LG (2014) Secretarybird Sagittarius serpentarius population trends and ecology: insights from South African citizen science data. PLoS ONE.  https://doi.org/10.1371/journal.pone.0096772 CrossRefPubMedPubMedCentralGoogle Scholar
  39. Hugo S, Altwegg R (2017) The second Southern African Bird Atlas Project: causes and consequences of geographical sampling bias. Ecol Evol 7:6839–6849CrossRefPubMedPubMedCentralGoogle Scholar
  40. Hugo S, van Rensburg BJ (2009) Alien and native birds in South Africa: patterns, processes and conservation. Biol Invasions 11:2291–2302CrossRefGoogle Scholar
  41. Hulme PE (2009) Trade, transport and trouble: managing invasive species pathways in an era of globalization. J Appl Ecol 46:10–18CrossRefGoogle Scholar
  42. Ivanova IM, Symes CT (2018) Common starling Sturnus vulgaris expansion in South Africa. Biodivers Obs 9:1–6Google Scholar
  43. Jackson H, Strubbe D, Tollington S, Prys-Jones R, Matthysen E, Groombridge JJ (2015) Ancestral origins and invasion pathways in a globally invasive bird correlate with climate and influences from bird trade. Mol Ecol 24:4269–4285CrossRefPubMedPubMedCentralGoogle Scholar
  44. Japiot X (2005) Psittacides en villes d’Europe. Mairie de Paris, Direction des Parcs, Jardin and Espaces Verts, Service de l’Ecologie Urbaine, Section Etudes et Prospectives Environnementales, Pole Biodiversité, Paris, FranceGoogle Scholar
  45. Jones D (2013) Fifty years of urban ecology. Wildl Aust 50:30–31Google Scholar
  46. Juniper T, Parr M (1998) Parrots: a guide to the parrots of the world. Pica, SussexGoogle Scholar
  47. Kark S, Iwaniuk A, Schalimtzek A, Banker E (2007) Living in the city: can anyone become an ‘urban exploiter’? J Biogeogr 34:638–651CrossRefGoogle Scholar
  48. Kolar CS, Lodge DM (2001) Progress in invasion biology: predicting invaders. Trends Ecol Evol 16:199–204CrossRefPubMedGoogle Scholar
  49. Kowarik I (2011) Novel urban ecosystems, biodiversity, and conservation. Environ Pollut 159:1974–1983CrossRefPubMedGoogle Scholar
  50. Kruger AC (2006) Observed trends in daily precipitation indices in South Africa: 1910–2004. Int J Climatol 26:2275–2285CrossRefGoogle Scholar
  51. Kumschick S, Nentwig W (2010) Some alien birds have as severe an impact as the most effectual alien mammals in Europe. Biol Conserv 143:2757–2762CrossRefGoogle Scholar
  52. Kumschick S, Alba C, Hufbauer RA, Nentwig W (2011) Weak or strong invaders? A comparison of impact between the native and invaded ranges of mammals and birds alien to Europe. Divers Distrib 17:663–672CrossRefGoogle Scholar
  53. Lee ATK, Altwegg R, Barnard P (2017) Estimating conservation metrics from atlas data: the case of southern African endemic birds. Bird Conserv Int 27:323–336CrossRefGoogle Scholar
  54. Lever C (1987) Naturalized birds of the world. Longman Scientific and Technical Editors, Essex, pp 241–286Google Scholar
  55. Lin Neo M (2012) A review of three alien parrots in Singapore. Nat Singap 5:241–248Google Scholar
  56. Lodge DM (1993) Biological invasions: lessons for ecology. Trends Ecol Evol 8:133–137CrossRefPubMedGoogle Scholar
  57. Lowe S, Browne M, Boudjelas S, De Poorter M (2000) 100 of the world’s worst invasive alien species. Invasive Species Specialist Group, Species Survival Commission, IUCN, Gland, p 12Google Scholar
  58. Luna A, Franz D, Strubbe D, Shwartz A, Braun MP, Hernández-Brito D, Malihi Y, Kaplan A, Mori E, Menchetti M, van Turnhout CAM, Parrott D, Chmielewski F, Edelaar P (2017) Reproductive timing as a constraint on invasion success in the ring-necked parakeet (Psittacula krameri). Biol Invasions 19:2247–2259CrossRefGoogle Scholar
  59. Mac Nally R, Timewell CAR (2005) Resource availability controls bird-assemblage composition through interspecific aggression. Auk 122:1097–1111CrossRefGoogle Scholar
  60. MacGregor-Fors I, Calderón-Parra R, Meléndez-Herrada A, López-López S, Schondube JE (2011) Pretty, but dangerous! Records of non-native monk parakeets (Myiopsitta monachus) in Mexico. Rev Mex Biodivers 82:1053–1056Google Scholar
  61. McKinney ML (2006) Urbanization as a major cause of biotic homogenization. Biol Conserv 127:247–260CrossRefGoogle Scholar
  62. Menchetti M, Mori E (2014) Worldwide impact of alien parrots (Aves Psittaciformes) on native biodiversity and environment: a review. Ethol Ecol Evol 26:172–194CrossRefGoogle Scholar
  63. Menchetti M, Mori E, Angelici FM (2016) Effects of the recent world invasion by ring-necked parakeets Psittacula krameri. In: Angelici FM (ed) Problematic Wildlife. Springer, Basel, pp 253–266CrossRefGoogle Scholar
  64. Møller AP (2009) Successful city dwellers: a comparative study of the ecological characteristics of urban birds in the Western Palearctic. Oecologia 159:849–858CrossRefPubMedGoogle Scholar
  65. Mori E, Ancillotto L, Menchetti M, Romeo C, Ferrari N (2013a) Italian red squirrels and introduced parakeets: victims or perpetrators? Hystrix. Ital J Mammal 24:195–196Google Scholar
  66. Mori E, Di Febbraro M, Foresta M, Melis P, Romanazzi E, Notari A, Boggiano F (2013b) Assessment of the current distribution of free-living parrots and parakeets (Aves: Psittaciformes) in Italy: a synthesis of published data and new records. Ital J Zool 80:158–167CrossRefGoogle Scholar
  67. Muirhead JR, Minton MS, Miller WA, Ruiz GM (2015) Projected effects of the Panama Canal expansion on shipping traffic and biological invasions. Divers Distrib 21:75–87CrossRefGoogle Scholar
  68. Newson SE, Johnston A, Parrott D, Leech DI (2011) Evaluating the population-level impact of an invasive species, ring-necked parakeet Psittacula krameri, on native avifauna. Ibis 153:509–516CrossRefGoogle Scholar
  69. O’Connor RJ (1986) Biological characteristics of invaders among bird species in Britain. Philos Trans R Soc B 314:583–598CrossRefGoogle Scholar
  70. Olden JD, Poff NL, Douglas MR, Douglas ME, Fausch KD (2004) Ecological and evolutionary consequences of biotic homogenization. Trends Ecol Evol 19:18–24CrossRefPubMedGoogle Scholar
  71. Orchan Y, Chiron F, Shwartz A, Kark S (2013) The complex interaction network among multiple invasive bird species in a cavity-nesting community. Biol Invasions 15:429–445CrossRefGoogle Scholar
  72. Paton PWC, Griffin CR, Griffin LH (1982) Rose-ringed parakeet nesting in Hawaii: a potential agricultural threat. Elepaio 43:37–39Google Scholar
  73. Pauchard A, Aguayo M, Peña E, Urrutia R (2006) Multiple effects of urbanisation on the biodiversity of developing countries: the case of a fast-growing metropolitan area (Concepción, Chile). Biol Conserv 127:272–281CrossRefGoogle Scholar
  74. Peacock DS, van Rensburg BJ, Robertson MP (2007) The distribution and spread of the invasive alien common myna, Acridotheres tristis L. (Aves: Sturnidae), in southern Africa. S Afr J Sci 103:465–473Google Scholar
  75. Peck HL, Pringle HE, Marshall HH, Owens IPF, Lord AM (2014) Experimental evidence of impacts of an invasive parakeet on foraging behaviour of native birds. Behav Ecol 25:582–590CrossRefPubMedPubMedCentralGoogle Scholar
  76. Peh KSH (2010) Invasive species in Southeast Asia: the knowledge so far. Biodivers Conserv 19:1083–1099CrossRefGoogle Scholar
  77. Perrin MR (2009) Niche separation in African parrots. In: Harebottle DM, Craig AJFK, Anderson MD, Rakotomanana H, Muchai M (eds) Proceedings of the 12th Pan-African ornithological congress, 2008. Animal Demography Unit, Cape Town, pp 29–37Google Scholar
  78. Perrin MR, Cowgill R (2005) Rose-ringed parakeet Psittacula krameri. In: Hockey PAR, Dean WRJ, Ryan PG (eds) Roberts Birds of Southern Africa, 7th edn. The Trustees of the John Voelcker Bird Book Fund, Cape Town, pp 229–230Google Scholar
  79. Ramalho CE, Hobbs RJ (2012) Time for a change: dynamic urban ecology. Trends Ecol Evol 27:179–188CrossRefPubMedGoogle Scholar
  80. Rebele F (1994) Urban ecology and special features of urban ecosystems. Glob Ecol Biogeogr Lett 4:173–187CrossRefGoogle Scholar
  81. Richardson DM, Pyšek P, Rejmánek M, Barbour MG, Panetta FD, West CJ (2000) Naturalisation and invasion of alien plants: concepts and definitions. Divers Distrib 6:93–107CrossRefGoogle Scholar
  82. Robertson A, Simmons RE, Jarvis AM, Brown CJ (1995) Can bird atlas data be used to estimate population size? A case study using Namibian endemics. Biol Conserv 71:87–95CrossRefGoogle Scholar
  83. Robertson A, Jarvis AM, Brown CJ, Simmons RE (1998) Avian diversity and endemism in Namibia: patterns from the Southern African Bird Atlas Project. Biodivers Conserv 7:495–511CrossRefGoogle Scholar
  84. Robertson MP, Cumming GS, Erasmus BFN (2010) Getting the most out of atlas data. Divers Distrib 16:363–375CrossRefGoogle Scholar
  85. Rosenzweig ML (2001) The four questions: what does the introduction of exotic species do to diversity? Evol Ecol Res 3:361–367Google Scholar
  86. Runde DE, Pitt WC, Foster JT (2007) Population ecology and some potential impacts of emerging populations of exotic parrots. In: Witmer GW, Pitt WC, Fagerstone KA (eds), Managing vertebrate invasive species: proceedings of an international symposium. USDA/APHIS Wildlife Services, CO, pp 338–360Google Scholar
  87. Rychlik L, Zwolak R (2006) Interspecific aggression and behavioural dominance among four sympatric species of shrews. Can J Zool 84:434–448CrossRefGoogle Scholar
  88. Sax DF, Stachowicz JJ, Brown JH, Bruno JF, Dawson MN, Gaines SD, Grosberg RK, Hastings A, Holt RD, Mayfield MM (2007) Ecological and evolutionary insights from species invasions. Trends Ecol Evol 22:465–471CrossRefPubMedGoogle Scholar
  89. Schäffler A, Swilling M (2012) Valuing green infrastructure in an urban environment under pressure: the Johannesburg case. Ecol Econ 86:246–257CrossRefGoogle Scholar
  90. Schlaepfer MA (2018) Introduced species are not always the enemy of conservation. In: Kareiva P, Marvier M, Silliman B (eds) Effective conservation science: data not dogma. Oxford University Press, Oxford, pp 39–44Google Scholar
  91. Schüttler E, Rozzi R, Jax K (2011) Towards a societal discourse on invasive species management: a case study of public perceptions of mink and beavers in Cape Horn. J Nat Conserv 19:175–184CrossRefGoogle Scholar
  92. Scortecci G (1953) Monaco (Myiopsitta monachus). In: Animali: come sono, dove vivono, come vivono. Labor Editors, Milano, ItalyGoogle Scholar
  93. Sebastián-González E, Sánchez-Zapata J, Botella F, Ovaskainen O (2010) Testing the heterospecific attraction hypothesis with time-series data on species co-occurrence. Proc R Soc B 277:2983–2990CrossRefPubMedGoogle Scholar
  94. Seebens H, Essl F, Dawson W, Fuentes N, Moser D, Pergl J, Pyšek P, van Kleunen M, Winter M, Blasius B (2015) Global trade will accelerate plant invasions in emerging economies under climate change. Glob Chang Biol 21:4128–4140CrossRefPubMedGoogle Scholar
  95. Sharp RL, Larson LR, Green GT (2011) Factors influencing public preferences for invasive alien species management. Biol Conserv 144:2097–2104CrossRefGoogle Scholar
  96. Shwartz A, Strubbe D, Butler CJ, Matthysen E, Kark S (2009) The effect of enemy-release and climate conditions on invasive birds: a regional test using the rose-ringed parakeet (Psittacula krameri) as a case study. Divers Distrib 15:310–318CrossRefGoogle Scholar
  97. Sol D, Timmermans S, Lefebvre L (2002) Behavioural flexibility and invasion success in birds. Anim Behav 63:495–502CrossRefGoogle Scholar
  98. Sol D, Bartomeus I, Griffin AS (2012) The paradox of invasion in birds: competitive superiority or ecological opportunism? Oecologia 169:553–564CrossRefPubMedGoogle Scholar
  99. Statistics South Africa (2018) Mid-year population estimates. Statistical release P0302, PretoriaGoogle Scholar
  100. Strubbe D, Matthysen E (2007) Invasive ring-necked parakeets Psittacula krameri in Belgium: habitat selection and impact on native birds. Ecography 30:578–588CrossRefGoogle Scholar
  101. Strubbe D, Matthysen E (2009) Experimental evidence for nest-site competition between invasive ring-necked parakeets (Psittacula krameri) and native nuthatches (Sitta europaea). Biol Conserv 142:1588–1594CrossRefGoogle Scholar
  102. Strubbe D, Matthysen E, Graham CH (2010) Assessing the potential impact of invasive ring-necked parakeets Psittacula krameri on native nuthatches Sitta europaea in Belgium. J Appl Ecol 47:549–557CrossRefGoogle Scholar
  103. Symes CT (2014) Founder populations and the current status of exotic parrots in South Africa. Ostrich 85:235–244CrossRefGoogle Scholar
  104. Symes CT, Roller K, Howes C, Lockwood G, van Rensburg BJ (2017) Grassland to urban forest in 150 years: avifaunal response to an African metropolis. In: Murgui E, Hedblom M (eds) Ecology and conservation of birds in urban environments. Springer, Switzerland, pp 309–343CrossRefGoogle Scholar
  105. Thabethe V, Thompson LJ, Hart LA, Brown M, Downs CT (2013) Seasonal effects on the thermoregulation of invasive rose-ringed parakeets (Psittacula krameri). J Therm Biol 38:553–559CrossRefGoogle Scholar
  106. Tindall SD, Ralph CJ, Clout MN (2007) Changes in bird abundance following common myna control on a New Zealand island. Pac Conserv Biol 13:202–212CrossRefGoogle Scholar
  107. Todes A, Kok P, Wentzel M, van Zyl J, Cross C (2010) Contemporary South African urbanisation dynamics. Urban Forum 21:331–348CrossRefGoogle Scholar
  108. Turrini T, Knop E (2015) A landscape ecology approach identifies important drivers of urban biodiversity. Glob Chang Biol 21:1652–1667CrossRefPubMedGoogle Scholar
  109. Underhill LG (2016) The fundamentals of the SABAP2 protocol. Biodivers Observ 7:1–12Google Scholar
  110. Van Heezik Y, Smyth A, Mathieu R (2008) Diversity of native and exotic birds across an urban gradient in a New Zealand city. Landsc Urban Plan 87:223–232CrossRefGoogle Scholar
  111. Van Rensburg BJ, Peacock DS, Robertson MP (2009) Biotic homogenization and alien bird species along an urban gradient in South Africa. Landsc Urban Plan 92:233–241CrossRefGoogle Scholar
  112. Veltman CJ, Nee S, Crawley MJ (1996) Correlates of introduction success in exotic New Zealand birds. Am Nat 147:542–557CrossRefGoogle Scholar
  113. Weissenbacher BKH, Allan D (1985) Rose-ringed Parakeet breeding attempts in the Transvaal. Ostrich 56:169CrossRefGoogle Scholar

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Authors and Affiliations

  1. 1.School of Animal, Plant and Environmental SciencesUniversity of the WitwatersrandWitsSouth Africa
  2. 2.School of Biological SciencesMonash UniversityMelbourneAustralia

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