Warmer air temperatures do not negatively affect body size and emergence success of loggerhead turtle (Caretta caretta) hatchlings at Yakushima Island, Japan, the largest rookery in the North Pacific
Warmer air temperatures do not negatively affect body size and emergence success of loggerhead turtle (Caretta caretta) hatchlings at Yakushima Island, Japan, the largest rookery in the North Pacific
复制标题
DOI：
10.1007/s00227-022-04093-0
复制
发表时间：
2022-08-01
期刊：
影响因子：
2.4
通讯作者：
Watanabe，Shun
中科院分区：
文献类型：
--
作者：
Hatase，Hideo;Watanabe，Shun
了解种群规模的决定因素对于有效保护和管理濒危物种至关重要。种群的增长取决于后代的存活。海龟后代的最初存活取决于孵化环境，较高的孵化温度对其活力和形态产生不利影响。因此，在一些砂温波动剧烈的栖息地，孵化特性已被证明表现出季节性和年度变化。我们研究了在一个温带繁殖地（日本屋久岛），红海龟（Caretta caretta）孵化的个体大小和出现成功率是否随季节性气温上升而下降。在同一筑巢季节的两个调查期间收集的离合器孵化在同一海滩孵化场超过两年。成年女性的身体大小奠定实验离合器之间的调查期间没有显着差异。对应于季节性气温上升，孵化期的离合器的第一次调查期间显着长于第二次。然而，无论是孵化大小和出现成功没有减少季节性，有没有显着的负相关关系，平均气温或估计的平均沙温孵化期间和孵化特性。这可能是由于实验海滩上的粗白色沙子和高降雨量的结合，这可能降低了沙子和巢穴的温度，并提高了沙子的湿度。季节性稳定的孵化特性可能是屋久岛是北太平洋最大的红海龟栖息地的原因之一。
Knowledge of the determinants of population size is essential for effective conservation and management of endangered species. Population growth is dependent on offspring survival. Initial survival of sea turtle offspring is subject to the incubation environment, where higher incubation temperatures negatively affect their vigour and morphology. Thus, at some rookeries with drastic fluctuations in sand temperature, hatchling characteristics have been demonstrated to exhibit seasonal and annual variation. We examined whether body size and emergence success of loggerhead turtle (Caretta caretta) hatchlings decline seasonally at a temperate rookery (Yakushima Island, Japan) in correlation with the seasonal rise in air temperature. Clutches collected during two survey periods within the same nesting season were incubated on the same beach hatchery over two years. The body size of adult females that laid experimental clutches was not significantly different between the survey periods. Corresponding to seasonally rising air temperatures, incubation duration for clutches of the first survey period was significantly longer than that of the second. However, both hatchling size and emergence success did not decrease seasonally, and there were no significant negative correlations between the mean air temperature or the estimated mean sand temperature during incubation and the hatchling characteristics. These may be due to a combination of coarse white sand and high rainfall on the experimental beach, which might have lowered sand and nest temperatures and elevated sand moisture. Seasonal stability in hatchling characteristics may be one of the reasons Yakushima Island is the largest rookery for loggerhead turtles in the North Pacific.