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Abundance and projected control of invasive house crows in Singapore

Brook, Barry W., Sodhi, Navjot S., Soh, M. C. K. and Lim, H. C. (2003). Abundance and projected control of invasive house crows in Singapore. Journal of Wildlife Management,67(4):808-817.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 15 times in Scopus Article | Citations
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Title Abundance and projected control of invasive house crows in Singapore
Author Brook, Barry W.
Sodhi, Navjot S.
Soh, M. C. K.
Lim, H. C.
Journal Name Journal of Wildlife Management
Publication Date 2003
Volume Number 67
Issue Number 4
ISSN 0022-541X   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0242370137
Start Page 808
End Page 817
Total Pages 10
Place of Publication Bethesda, USA
Publisher Wildlife Society
HERDC Category C1 - Journal Article (DEST)
Abstract The Indian house crow (Corvus splendens) has successfully invaded tropical and subtropical regions well beyond its native range, reaching pest proportions in many areas. The invasive population of house crows in Singapore (Southeast Asia) has increased at least 30-fold since 1985 and now numbers in excess of 130,000 birds. To understand the population ecology and behavior of the house crow in Singapore, we undertook regular population size and roost surveys, dissections of birds shot (to provide age structure and breeding status), detailed nestsite observations, and monitoring of coastal dispersal. Using a discrete-time, density-dependent population model to synthesize this information, we demonstrated that at least 41,000 crows will need to be culled in the first year of a control program, and equivalent effort committed each year thereafter, to be confident of suppressing the Singapore population from its 2001 density of 190 birds/km(2) to the management target of <10 birds/km(2) within a 10-year period. This figure drops to 32,000 if culling is combined with other management strategies such as resource limitation and nest destruction. Complete eradication of the house crow from Singapore may be an unrealistic goal due to potential difficulties in detecting crows at IOW population densities and influx of migrants from neighboring Malaysia. Our study has implications for pest-bird management in other cities in Asia, Africa, and the Middle East, and presents it surrogate population-dynamics management tool for use in regions where the house crow has become established as a pest species, but where limited local field data is available.
Keywords population-dynamics
bird pests
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