Effect of Intertidal Elevation at Tsuyazaki Cove,Fukuoka,Japan on Survival Rate of Horseshoe Crab Tachypleus tridentatus Eggs  

作　　者：ITAYA Shinji SHUUNO Mari ONIKURA Norio TAI Akira YANO Shinichiro 

机构地区：[1]Environmental Fluid Dynamics Laboratory,Department of Urban and Environmental Engineering,Graduate School of Engineering,Kyushu University,Fukuoka,819-0395,Japan [2]Tsuyazaki Seaside Nature School,Fukutsu,811-3304,Japan [3]Fishery Research Laboratory,Department of Bioresource Science,Graduate School of Bioenvironmental Science,Kyushu University,Fukuoka,819-0395,Japan

出　　处：《Journal of Ocean University of China》2022年第3期601-610,共10页中国海洋大学学报（英文版）

摘　　要：Physical factors affecting the survival of Tachypleus tridentatus eggs were investigated by translocating their eggs between the high intertidal zone and the low intertidal zone of a known spawning site.The mean egg survival rates per day were highest in the mid intertidal zone(45.1%±25.4%)and the lowest in the low intertidal zone(13.3%±27.6%).Differences in the elevation,air exposure time,and water content of the spawning ground were significant factors determining the egg survival rates.Excessive or insufficient air exposure time resulted in inadequate water content at higher and lower intertidal zones and could reduce egg survival.On the other hand,moderate saturation and dehydration were repeated with each tidal movement in the mid intertidal zone.This dynamic is considered as one of the crucial factors for the survival of eggs and is considered optimal for spawning.Therefore,the protection of the mid intertidal zone is imperative for maximizing the egg survival rate in Tsuyazaki Cove where almost all suitable nesting sites have disappeared due to coastal development.By protecting these optimal sites for spawning and recovering other optimal sites on suitable beaches,a positive contribution can be made to future management and conservation.The study also suggests that translocating eggs from marginal to optimal spawning sites might be a recovery strategy for this globally endangered species.

关 键 词：air exposure time globally endangered species intertidal elevation intertidal zone optimal spawning site Tachypleus tridentatus translocated horseshoe crab eggs Tsuyazaki Cove 

分 类 号：Q958.8[生物学—动物学]