Table 4 Summary of fields examined in different regions
Location (Region, City, Prefecture) | Average area of rice paddy field examined ± SE (ha) (n) | Average area of fields investigated for land use in each year ± SE (ha) (n) | Average distance between fields  ± SE (m) | Mean source habitat (%) (range) |
|---|---|---|---|---|
Maesawa, Oshu, Iwate | 0.22 ± 0.02 a (47) | 0.15 ± 0.002 b (3508) | 810.6 ± 27.4 | 14.65 (3.55–28.68) |
Otomo, Rikuzen-Takata, Iwate | 0.23 ± 0.02 a (18) | 0.11 ± 0.003 c (1223) | 559.6 ± 16.1 |  0.32 (0.13–0.53) |
Semine, Kurihara, Miyagi | 0.28 ± 0.04 a (28) | 0.16 ± 0.005 a (1911) | 596.1 ± 89.8 |  9.34 (0.84–29.09) |