[1] Natl Univ Singapore, Dept Geog, 1 Arts Link, Singapore 117570, Singapore
[2] Singapore Bot Gardens, Ctr Urban Greenery & Ecol, 1E Cluny Rd, Singapore 259601, Singapore
[3] Blue Forests, Jl Pengayoman,Kompleks Gladiol B-3, Makassar 90233, South Sulawesi, Indonesia
[4] Charles Darwin Univ, Res Inst Environm & Livelihoods, Red Bldg 1,Ellengowan Dr, Darwin, NT 0909, Australia