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The other subpopulation of Christmas Island White-eye Zosterops natalis (Aves: Zosteropidae): a historic introduction has led to an enduring subpopulation on Horsburgh Island, Cocos (Keeling) Islands group

Woinarski, J. C. Z., Detto, T. and Macrae, Ismail (2014). The other subpopulation of Christmas Island White-eye Zosterops natalis (Aves: Zosteropidae): a historic introduction has led to an enduring subpopulation on Horsburgh Island, Cocos (Keeling) Islands group. Raffles Bulletin of Zoology,Supplement No. 30:65-70.

Document type: Journal Article
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IRMA ID 84376995xPUB169
Title The other subpopulation of Christmas Island White-eye Zosterops natalis (Aves: Zosteropidae): a historic introduction has led to an enduring subpopulation on Horsburgh Island, Cocos (Keeling) Islands group
Author Woinarski, J. C. Z.
Detto, T.
Macrae, Ismail
Journal Name Raffles Bulletin of Zoology
Publication Date 2014
Volume Number Supplement No. 30
ISSN 0217-2445   (check CDU catalogue  open catalogue search in new window)
Start Page 65
End Page 70
Total Pages 6
Place of Publication Singapore
Publisher Raffles Museum of Biodiversity Research
HERDC Category C1 - Journal Article (DIISR)
Abstract The Christmas Island White-eye Zosterops natalis occurs naturally only on the 135 km 2 Christmas Island. Between 1888 and 1900 (remarkably soon after it was first discovered and described), it was introduced to the 1 km 2 Horsburgh Island in the Cocos (Keeling) Islands group. There has been limited subsequent documentation of the fate of this translocated population. Based on transect sampling in 2013, we estimate the population size to be 1084 individuals (with 95% confidence limits of 731 to 1716). This represents a substantially larger estimate than the previous estimate (of 400 individuals in 1941), and indicates a greater abundance than the most recent (1982) non-quantitative record of its status. In contrast to previous documentation, this species is widespread on Horsburgh Island, and abundant in a mosaic of natural and modified vegetation (dominated by coconut Cocos nucifera plantation with Scaevola taccada shrub layer). Contextualising the conservation significance of this introduced population is difficult because there is no reliable estimate of the population size on Christmas Island, but it is plausible that the Horsburgh Island subpopulation now comprises c. 5% of the species’ total population size. However, more importantly, its significance lies in the provision of a second location that may reduce extinction risk.
Keywords Chrstmas Island
Cocos (Keeling) Islands
Conervation
Population
Census
Translocation
Description for Link Link to publisher's version
URL http://lkcnhm.nus.edu.sg/nus/images/data/raffles_bulletin_of_zoology/supplement30/S30_C10_65_70.pdf
 
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Created: Wed, 19 Aug 2015, 12:27:21 CST