Abstract
The conservation value of urban parks for butterfly communities remains poorly understood, particularly for tropical butterflies in Asia. We conducted point count and route transect butterfly surveys, and used them to sample four habitats located within 13 urban parks across Hong Kong. We found 1054 individuals and 58 species of butterflies recorded in 60 survey hours over 6 months. This represents approximately one quarter of the entire known Hong Kong butterfly species list. Over 30 % of the individuals counted were Catospilia sp. but six of the species identified are classified locally as rare or very rare. Tree-covered habitats and grasslands showed higher butterfly diversity than open areas. The most common butterfly behavior was “directed flight,” which we also found to be habitat-dependent and most common in ponds and open areas. We additionally observed the use of vegetation in urban parks, which included 40 species of nectar plant and four records of butterfly oviposition. The high butterfly diversity, presence of rare species and usage of vegetation (especially as a nectar resource) we documented in this study suggests that urban parks have some conservation value for Hong Kong. However, the use of pesticides and heavy vegetation clearing may limit significant butterfly reproduction and population growth. Altogether these results emphasize the diversity of uses of urban parks for butterflies in Hong Kong while also providing possible directions for improvement in habitat and vegetation management that could increase urban park value for biodiversity.
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Acknowledgments
We thank the Leisure and Cultural Service Department for granting permission to undertake research in the urban parks of Hong Kong. Moreover, KCT would like to thank Mr. Pun Sui Fai whose knowledge sharing and experience in butterfly watching and breeding in Hong Kong has been invaluable. We thank Mrs. Poon Choi Hei Yin for assistance in plant identification. Toby Tsang and Melanie Chan provided helpful input on the manuscript.
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Tam, K.C., Bonebrake, T.C. Butterfly diversity, habitat and vegetation usage in Hong Kong urban parks. Urban Ecosyst 19, 721–733 (2016). https://doi.org/10.1007/s11252-015-0484-2
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DOI: https://doi.org/10.1007/s11252-015-0484-2