*2.3. Habitat Survey Method*

In the viewpoint of bird's habitat, the elements of landscapes at traditional folk village include diverse patches like houses (thatched or tile-roofed), cultivation areas (croplands, paddies and orchards), wetlands (rivers and ponds) and forests. By using the digital contour maps (1:25,000 or 1:5000) and forest cover maps (1:5000), we classified land cover into 13 categories, including paddies, deciduous forests, grasslands, coniferous forests, croplands, rivers, bare lands, residential areas, mixed forests, riparian shrubs, roads, bamboo forests and ponds (Table 2). After classification of land cover, we calculated the percentage value of each cover with the application of ArcMap 9.3 (ESRI, 1999). Habitat diversity and diversity of functional traits were calculated using the Shannon-Wiener diversity index:

$$\mathbf{H}' = -\mathbf{p}i\Sigma\_{i=1}^{\mu}\ln(pi) \tag{1}$$


**Table 1.** Locations, areas and survey distances at five maeuls.

\* Maeul refers to village in pure Korean language.


**Table 2.** Percentage of each land cover and habitat diversity index at five maeuls.

\* HA: Hahoe, WG: Wanggok, NA: Nagan, YD: Yangdong, HG: Hangae.
