Biased primary sex ratio in the bushcricket Poecilimonveluchianus, an insect with sex chromosomes
Biased primary sex ratio in the bushcricket Poecilimonveluchianus, an insect with sex chromosomes
复制标题
DOI：
10.1007/s002650050280
复制
发表时间：
1996-09
影响因子：
2.3
通讯作者：
K. Reinhold
中科院分区：
文献类型：
--
作者：
K. Reinhold
对绒螯蟹Poecilimon veluchianus的子代性比进行了研究。雌性之间的后代性别比例差异显著（图1）。 性别决定前的低死亡率表明，这种异质性已经存在于初级后代的性别比中。精子年龄和雌性年龄对后代性别比没有影响（图2）。 然而，雄性交配时的年龄与后代的性别比显著相关（图3）。 有两种类型的男性：一种类型主要在年轻时生女儿，随着年龄的增长，儿子的比例越来越大。另一种类型产生的后代性别比为1：1，与年龄无关（图4）。 这两种类型的男性似乎出现在大约相同的数量。性比变化（1）可以自适应地补偿由性别特异性运动引起的局部性比偏差，或者（2）如果产蛋日期对后代适合度存在性别差异效应，则它可能是自适应的。
Offspring sex ratio at hatching was examined in the bushcricketPoecilimon veluchianus. Offspring sex ratios varied significantly between females (Fig. 1). Low mortality prior to sex determination established that this heterogeneity was already present in the primary offspring sex ratio. Sperm age and female age had no influence on offspring sex ratio (Fig. 2). Male age at copulation, however, correlated significantly with offspring sex ratio (Fig. 3). There were two types of males: one type produced predominantly daughters when young and an increasing proportion of sons with age. The other type produced, independent of age, 1:1 offspring sex ratios (Fig. 4). The two types of males seem to occur in approximately equal numbers. Sex ratio variation (1) may adaptively compensate for local sex ratio biases caused by sex-specific motility, or (2) it may be adaptive if there is a sex-differential effect of laying date on offspring fitness.