Fig. S1. Sampling sites on Ulleungdo and Dokdo islands. (a) location of Ulleungdo (Seonginbong) and Dokdo (Dongdo and Seodo) islands and map showing sampling sites (black dots, Seonginbong; 37°30'05.9"N 130°52'04.9"E, Dongdo; 37°14'21.0"N 131°52'10.4"E, and Seodo; 37°14'31.5"N 131°51'51.6"E) on (b) Ulleungdo (Seonginbong) and (c) Dokdo (Dongdo and Seodo). (d–f) Sampling sites on (d) Seonginbong (e) Dongdo and (f) Seodo.