Emu Emu Society
Journal of BirdLife Australia

Is the conservation value of small urban remnants of eucalypt forest limited by increased levels of nest predation?

Scott D. Piper A B and Carla P. Catterall A

A Faculty of Environmental Sciences, Griffith University, Nathan, Qld 4111, Australia.

B Corresponding author. Email: s.piper@griffith.edu.au

Emu 106(2) 119-125 http://dx.doi.org/10.1071/MU05043
Submitted: 5 September 2005  Accepted: 28 February 2006   Published: 19 May 2006


Levels of predation on bird nests may be increased in small remnant patches compared with levels in extensive forests, owing to edge-related nest predation or mesopredator release. Previous work using artificial nests has demonstrated that increased rates of nest predation, owing mainly to avian predators, occur near edges of fragmented subtropical Australian eucalypt forests. This implies that levels of nest predation within small patches of remnant forest, which could effectively be all ‘edge’, may also be increased. We used artificial nests, deployed on the ground and 1–4 m above the ground in shrubs, to compare levels of nest predation and predator assemblages between interiors of small (10–20 ha) suburban remnant patches and extensive tracts (>400 ha) of subtropical Australian eucalypt forest. Most predation of nests in shrubs in both remnants and extensive forests was by birds, although there were some differences in the assemblages involved. Ground-nests were far more likely to be depredated by mammals or lizards in the remnants than in the extensive forests. However, despite the differences between their predator assemblages, overall levels of nest predation did not differ significantly between remnants and extensive forests, suggesting that any edge-related predation was of insufficient spatial extent to affect the interiors (>50 m from external edges) of remnants in this size-class. Eucalypt forest remnants of 10–20 ha often support bird assemblages typical of extensive forest tracts, but may act as population sinks for these species if levels of nest predation are excessive. Our results support the contention, however, that remnants in this size-class are useful to the conservation of forest bird assemblages.


Andrén H. (1995). Effects of landscape composition on predation rates at habitat edges. In ‘Mosaic Landscapes and Ecological Processes’. (Eds L. Hansson, L. Fahrig and G. Merriam.) pp. 225–255. (Chapman and Hall: London.)

Barrett G. W. Ford H. A. Recher H. F. 1994 Conservation of woodland birds in a fragmented rural landscape. Pacific Conservation Biology 1 245 256

Batary P. Baldi A. 2004 Evidence of an edge effect on avian nest success. Conservation Biology 18 389 400

Bender D. J. Contreras T. A. Fahrig L. 1998 Habitat loss and population decline: a meta-analysis of the patch size effect. Ecology 79 517 533

Berry L. 2002 Predation rates of artificial nests in the edge and interior of a southern Victorian forest. Wildlife Research 29 341 345

Catterall C. P., Green R. J., and Jones D. N. (1991). Habitat use by birds across a forest-suburb interface in Brisbane: implications for corridors. In ‘Nature Conservation 2: The Role of Corridors’. (Eds D. A. Saunders and R. J. Hobbs.) pp. 247–258. (Surrey Beatty: Sydney.)

Catterall C. P. Kingston M. B. Park K. 1997 Use of remnant forest habitat by birds during winter in subtropical Australia: patterns and processes. Pacific Conservation Biology 3 262 274

Catterall C. P. Kingston M. B. Park K. Sewell S. 1998 Deforestation, urbanisation and seasonality: interacting effects on a regional bird assemblage. Biological Conservation 84 65 81

Crooks K.R. Soulé M.E. 1999 Mesopredator release and avifaunal extinctions in a fragmented system. Nature 400 563 566 DOI

Fulton G. R. Ford H. A. 2003 Quail eggs, modelling clay eggs, imprints and small mammals in an Australian woodland. Emu 103 255 258 DOI

Gardner J. L. 1998 Experimental evidence for edge-related predation in a fragmented agricultural landscape. Australian Journal of Ecology 23 311 321

Graetz R.D., Wilson M.A., and Campbell S.K. (1995). Landcover disturbance over the Australian continent. Australian Department of Environment, Sport and Territories, Biodiversity Series Paper No. 7, Canberra.

Heske E. J. Robinson S. K. Brawn J. D. 2001 Nest predation and neotropical migrant songbirds: piecing together the fragments. Wildlife Society Bulletin 29 52 61

Laurance W. F. 2000 Do edge effects occur over large spatial scales? Trends in Ecology & Evolution 15 134 135

Laurance W. F. Yensen E. 1991 Predicting the impacts of edge effects in fragmented habitats. Biological Conservation 55 77 92 DOI

Low T. (1995). ‘The Animals of Brisbane: A Vertebrate Status Review.’ (Brisbane City Council: Brisbane.)

Loyn R. H. (1987). Effects of patch area and habitat on bird abundances, species numbers and tree health in fragmented Victorian forests. In ‘Nature Conservation: The Role of Remnants of Native Vegetation’. (Eds D. A. Saunders, G. W. Arnold, A. A. Burbidge and A. J. M. Hopkins.) pp. 65–77. (Surrey Beatty: Sydney.)

Mac Nally R. Bennett A. F. Horrocks G. 2000 Forecasting the impacts of habitat fragmentation. Evaluation of species-specific predictions of the impact of habitat fragmentation on birds in the box-ironbark forests of central Victoria, Australia. Biological Conservation 95 7 29 DOI

Maier T. J. DeGraaf R. M. 2001 Differences in depredation by small predators limit the use of plasticine and zebra finch eggs in artificial-nest studies. Condor 103 180 183

Major R. E. Kendal C. E. 1996 The contribution of artificial nest experiments to understanding avian reproductive success: a review of methods and conclusions. Ibis 138 298 307

Marzluff J. M., and Restani M. (1999). The effects of forest fragmentation on avian nest predation. In ‘Forest Fragmentation: Wildlife and Management Implications’. (Eds J. A. Rochelle, L. A. Lehmann and J. Wisniewski.) pp. 155–169. (Brill Academic Publishing: Köln, Germany.)

Matthews A. Dickman C. R. Major R. E. 1999 The influence of fragment size and edge on nest predation in urban bushland. Ecography 22 349 356

Murcia C. 1995 Edge effects in fragmented forests: implications for conservation. Trends in Ecology & Evoloution 10 58 62

Paton P. W. C. 1994 The effect of edge on avian nest success: how strong is the evidence? Conservation Biology 8 17 26 DOI

Piper S. D. Catterall C. P. 2003 A particular case and a general pattern: hyperaggressive behaviour by one species may mediate avifaunal declines in fragmented Australian forests. Oikos 101 602 614 DOI

Piper S. D. Catterall C. P. 2004 Effects of edge type and nest height on predation of artificial nests within subtropical Australian eucalypt forests. Forest Ecology and Management 203 361 372 DOI

Piper S. D. Catterall C. P. In press Impacts of picnic areas on bird assemblages and nest predation activity within Australian eucalypt forests. Landscape and Urban Planning

Piper S. Catterall C. P. Olsen M. 2002 Does adjacent land use affect predation of artificial shrub-nests near eucalypt forest edges? Wildlife Research 29 127 133

Pulliam H. R. 1988 Sources, sinks, and population regulation. American Naturalist 132 652 661 DOI

Quinn G. P., and Keogh M. J. (2002). ‘Experimental Design and Data Analysis for Biologists.’ (Cambridge University Press: Cambridge, UK.)

Rogers C. M. Caro M. J. 1998 Song sparrows, top carnivores and nest predation: a test of the mesopredator release hypothesis. Oecologia 116 227 233 DOI

Roper J. J. 1992 Nest predation experiments with quail eggs: too much to swallow? Oikos 65 528 530

Russell E. M. 2000 Avian life histories: is extended parental care the southern secret? Emu 100 377 399

Sewell S. R. Catterall C. P. 1998 Bushland modification and styles of urban development: their effects on birds in south-east Queensland. Wildlife Research 25 41 63 DOI

Sieving K. E. 1992 Nest predation and differential insular extinction among selected forest birds of central Panama. Ecology 73 2310 2328

Söderström B. 1999 Artificial nest predation rates in tropical and temperate forests: a review of the effects of edge and nest site. Ecography 22 455 463

Söderström B. Pärt T. Rydén J. 1998 Different nest predator faunas and nest predation risk on ground and shrub nests at forest ecotones: an experiment and a review. Oecologia 117 108 118

Soulé M. E. Bolger D. T. Alberts A. C. Wright J. Sorice M. Hill S. 1988 Reconstructed dynamics of rapid extinctions of chaparral-requiring birds in urban habitat islands. Conservation Biology 2 75 92 DOI

SPSS Inc. (2003). ‘SPSS for Windows, Release 12.0.1.’ (SPSS Inc.: Chicago, IL.)

Taylor L. N. H. Ford H. A. 1998 Predation of artificial nests in a fragmented landscape on the New England Tablelands of New South Wales. Wildlife Research 25 587 594 DOI

Terborgh J., and Winter B. (1980). Some causes of extinction. In ‘Conservation Biology’. (Eds M. E. Soulé and B. A. Wilcox.) pp. 119–133. (Sinauer: Sunderland, MA.)

Wilcove D. S., McLellan C. H., and Dobson A. P. (1986). Habitat fragmentation in the temperate zone. In ‘Conservation Biology: The Science of Scarcity and Diversity’. (Ed. M. E. Soulé.) pp. 237–256. (Sinauer: Sunderland, MA.)

Zanette L. Jenkins B. 2000 Nesting success and nest predators in forest fragments: a study using real and artificial nests. Auk 117 445 454

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