earticle

영어

To monitor a relocated population and a natural population of Hynobius yangi, we applied drift fences and pitfall traps which were constructed around three artificial wetlands in the relocated population and one natural wetland in the natural population and counted the number of breeding salamanders and eggs during breeding seasons from 2006 to 2010. The number of adults entering to breeding sites was the greatest around the mid March and showed a positive relationship with the amounts of daily precipitation. The number of adults appeared in the relocated population showed no significant changes, whereas the number of adults in the natural population decreased gradually mostly by habitat loss and disturbance in the areas. The operational sex ratio in both breeding populations ranged from 0.7 to 1.9. The number of adults appeared in the breeding populations showed a negative relationship with the annual minimum temperature and the monthly mean temperature and precipitation during a winter period (from November to March). Our results suggest that up to date, the relocated population has maintained its size in the areas, but need to continuously pay attention to how the disturbed natural population affects the relocated population.