Effect of traffic noise on black-faced spoonbills in the Taipa–Coloane Wetland Reserve, Macao
Min Zhang A , Kuaitat Cheong B , Kunfong Leong B and Fasheng Zou A C
+ Author Affiliations
- Author Affiliations
A Guangdong Entomological Institute/South China Institute of Endangered Animals, Guangzhou 510260, China.
B Macao Civic and Municipal Affairs Bureau, Macao Special Administrative Region CP3054, China.
C Corresponding author. Email: zoufs@gdei.gd.cn
Wildlife Research 39(7) 603-610 https://doi.org/10.1071/WR12060
Submitted: 19 March 2012 Accepted: 31 July 2012 Published: 7 September 2012
Abstract
Context: Nearly 20% of black-faced spoonbills (Platalea minor), a globally endangered species, winter along the coasts of the Pearl River Estuary, China. However, these wintering habitats are threatened by urban development. Especially in Macao, road construction for the tourism industry has resulted in habitat deterioration.
Aims: Our study aimed to assess the effects of traffic noise on the distribution and behaviour of black-faced spoonbills in the Taipa–Coloane Wetland Reserve, Macao SAR.
Methods: We built a traffic-noise prediction model for habitat-suitability division. Then we investigated the relationship between traffic noise and diurnal of spoonbill behaviours by collecting traffic-noise data on surrounding roads and observing the activity of black-faced spoonbills in the area over two winters, from 2007 to 2009.
Key results: The maximum number of individuals present in a single month was 50 in the winter of 2007–08 (in February) and 52 in the winter of 2008–09 (in January). Continuous traffic noise was 46.5 and 45.4 dB(A), respectively, at roosting sites in two ecological zones. On the basis of the prediction model, only 10.8 of 30.3 ha were suitable for spoonbills, with noise levels lower than 47 dB(A). Most of the time, the spoonbills were acclimated to the traffic and were not alarmed. However, heavy trucks with a high noise level of 81.8 ± 2.3 dB(A) sometimes disrupted spoonbill behaviour.
Conclusions: The traffic noise around the Taipa–Coloane Wetland Reserve did exist but did not substantially affect black-faced spoonbills. For the birds mainly roosting in a quieter area, the small area of suitable habitat may indirectly limit population growth.
Implications: The fences around Ecological Zone I were successful in minimising visual stimuli from human activities and passing cars. To maintain the suitability of the winter habitat in Macao, restrictions on traffic flow, especially on heavy truck volume, are necessary for spoonbill conservation.
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