Reproductive biology of the land crab Epigrapsus politus Heller, 1862 (Brachyura: Gecarcinidae) on Iriomote-jima, Japan
Reproductive biology of the land crab Epigrapsus politus Heller, 1862 (Brachyura: Gecarcinidae) on Iriomote-jima, Japan
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日本西表岛陆蟹 Epigrapsus politus Heller 的生殖生物学，1862 年（Brachyura：Gecarcinidae）
DOI：
10.1093/jcbiol/ruaa003
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发表时间：
2020
影响因子：
1.1
通讯作者：
Kohno Hiroyoshi
中科院分区：
文献类型：
--
作者：
Doi Wataru;Itoh Daiki;Kato Shunsuke;Mizutani Akira;Kohno Hiroyoshi
2017年9月至11月，通过在日本西表岛亚热带地区进行的标记-再捕获实验，研究了陆蟹Epigrapsus politus（Gecarcinidae）的繁殖周期。E.卵石海岸的politus在繁殖季节增加，然后下降。螃蟹密度估计为423.5超过20平方米。人口显示出双峰和单峰体长频率的男性和女性，分别。寿命估计为一至二或三年。9月上旬至11月下旬检测到产卵（产卵）女性，最高丰度发生在9月下旬至11月上旬。产卵雌性的胚胎发育（无眼和有眼卵）的比例以及重新捕获的雌性的胚胎和胚胎发育的存在或不存在表明，幼虫在满月后的几天被释放。相比之下，鸡蛋挤出发生在前一次满月期间，即，将蛋孵育四周。雌性在一个单一的繁殖季节产生一窝。对E. politus的特点是短，发生在一个较冷的季节比其他gecarcinids栖息在西北太平洋的亚热带岛屿。
The breeding cycle of the land crabEpigrapsus politus(Gecarcinidae) was studied through a mark-recapture experiment on subtropical Iriomote-jima, Japan between September and November 2017. The abundance ofE. politusat the cobble shore increased during the breeding season, and then decreased. Crab density was estimated to be 423.5 over 20 m2. The population showed a bimodal and a monomodal body-length frequency for males and females, respectively. Lifespan was estimated to be between one and two or three years. Ovigerous (egg bearing) females were detected from early September to late November, with the highest abundance occurring between late September and early November. The proportion of embryonic development (non-eyed and eyed eggs) of ovigerous females and the presence or absence of embryos and embryonic development of recaptured females showed that larvae were released on the days after the full moon. In comparison, egg extrusion occurred during the period of the previous full moon, i.e., eggs were incubated for four weeks. Females produced one brood within a single breeding season. The breeding ecology ofE. polituswas characterized as being short and occurring in a cooler season than that of other gecarcinids inhabiting the subtropical islands of the northwest Pacific.