Non-functional hermaphroditism in three species of Clupeiformes from Tokyo Bay, Japan
Non-functional hermaphroditism in three species of Clupeiformes from Tokyo Bay, Japan
复制标题
日本东京湾三种鲱鱼目的非功能性雌雄同体
DOI：
10.1111/jai.12117
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发表时间：
2013
影响因子：
0.9
通讯作者：
Tomoki Sunobe and Kiyoshi Hagiwara
中科院分区：
文献类型：
--
作者：
Tsuchida K;Kudo K;Ishiguro N;Tomoki Sunobe and Kiyoshi Hagiwara
在日本横滨市东京湾海域的黑眶沙丁鱼（Sardinops melanostictus）、苏氏沙丁鱼（Sardinella zunasi）和英格兰沙丁鱼（Englis nasi）中发现了间性性腺，其出现率分别为18.2%、34.6%和33.9%。虽然在这些个体中精子发生正常进行，但在雌雄同体的睾丸外检测到睾丸发生前阶段的卵母细胞，表现为单个细胞或小簇。结果表明，这些物种是无功能的雌雄同体。由于在严重污染之前和/或远离城市影响的地点收集的其他鲱形物种中已经报道了间性性腺，这种无功能的雌雄同体可能在该命令中常见。然而，高比率的雌雄同体外观也表明这些卵母细胞的发育可能是由环境雌激素诱导的。
Intersexual gonads were detected in three clupeiform species,Sardinops melanostictus,Sardinella zunasiandEnglaulis japonicus, collected in Tokyo Bay off Yokohama City, Japan, of which appearance rates were 18.2, 34.6 and 33.9 %, respectively. While spermatogenesis proceeded normally in these individuals, previtellogenic stage oocytes were detected outside of the testes in the hermaphrodites, appearing as a single cell or small clusters. The results suggest that these species are non‐functional hermaphrodites. As intersexual gonads have been reported in other clupeiform species collected before significant pollution and/or at sites far from urban influences, such non‐functional hermaphrodites may be common occurrence in the order. However, high rates of hermaphrodite appearance also suggest the possibility that the development of these oocytes were induced by environmental estrogens.