The species diversity and richness of the regions are 3.07
and 10.06, respectively. By region, the diversities of Bigeumdo
and Dochodo islands are 3.09 and 2.63, respectively.
Bigeumdo and Dochodo islands have species richness of
12.52 and 11.33, respectively. Number of species per area is
2.22 for Bigeumdo island and 2.00 for Dochodo island.
Numbers of individuals per area are 52.35 for Bigeumdo
island and 36.19 for Dochodo island. The figures are
similar for both islands but the former has larger number of
individuals. This is because more shorebirds are discovered
in Bigeumdo island.
Except Passeriformes birds, Bigeumdo island has more
individuals than its counterpart. In particular, the shorebirds
show a big difference (Fig. 3). Environmental factors which
affect the advent individuals of shorebirds are proximity to
the land and the area of mud flats. Also, the birds require
resting places without being filled with water during the full
tide and the types and richness of prey depend on the mud
flat quality (Lee et al., 2010). Therefore, it is judged that
compared to Dochodo island, Bigeumdo island has wide
and clustered salt ponds which may be used as resting
places for birds. For Dochodo island, edges where a forest
and grassland meets show high habitat density and species
diversity of birds and other wildlife animals (Lay, 1938;