Abstract
Invasive alien species are seriously threatening biodiversity worldwide. This study focused on Procambarus clarkii, a native species of the southeastern United States that is now widely recognized as an invasive species in Japan's rice paddy fields. Despite regulations regarding P. clarkii, its impact extends beyond biodiversity loss, affecting both agriculture and water management. We investigated the characteristics of rice paddies affecting P. clarkii habitats, focusing on the influence of permanent water bodies such as ditches. Our results showed a significant negative effect of water temperature on P. clarkii abundance during the irrigation season, which we attributed to paddy field temperatures exceeding the preferred range for this species during the irrigation season. Although ditches, as permanent water bodies, were the primary habitat for this species in our study area, ditch presence did not strongly affect the species’ population in the rice paddies, which was likely due to an increase in water temperature in the rice paddies as a result of ditch establishment.
https://ror.org/03aptyv62 
