Pre-oviposition ejaculation in externally fertilizing fish : how sneaker male rose bitterlings contrive to mate
Pre-oviposition ejaculation in externally fertilizing fish : how sneaker male rose bitterlings contrive to mate
复制标题
体外受精鱼的产卵前射精：运动鞋雄性玫瑰苦鱼如何设法交配
DOI：
10.1111/j.1439-0310.1996.tb01169.x
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发表时间：
2010
期刊：
影响因子：
1.7
通讯作者：
Y. Kanoh
中科院分区：
文献类型：
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作者：
Y. Kanoh
在自然和人工条件下研究了产卵前射精作为玫瑰苦鱼（Rhodeus ocellatus）中运动鞋雄性的交配策略。在日本大阪八尾市的一个小池塘中，发现雄性和雌性的运行性别比约为3.5:1，雄性与充当玫瑰苦贝产卵床的贻贝的比例约为2:1。产卵到贻贝体内的竞争性从属玫瑰苦味雄性通过偷偷参与交配，因为并非所有雄性都能占据贻贝周围的领地。雄性运动鞋不仅在产卵后而且在产卵前都会释放精子（雄性在产卵前的这种射精运动称为“排卵前射精”）。在与运动鞋配对产卵时，运动鞋经常进行产卵前射精，而领地雄性从未进行过这种行为。在野外，运动鞋的产卵前射精与领地雄性对雌性的引导同时发生。在人工条件下，我通过电泳父本分析证明，运动鞋的产卵前射精比领地雄性的产后射精更有效。此外，运动鞋雄性的射精成功率和受精成功率均存在负向体型依赖性。
Pre-oviposition ejaculation as a mating tactic of sneaker males in the rose bitterling, Rhodeus ocellatus, was studied under natural and artificial conditions. In a small pond in Yao city, Osaka, Japan, the operational sex ratio of males and females was found to be approximately 3.5:1 and the proportion of males to the mussels, which serve as spawning beds for the rose bitterling, was approximately 2:1. Competitively subordinate rose bitterling males which spawned into the mussels participated in mating by sneaking, because not all males could occupy territories around the mussels. The sneaker males often released sperm not only after but also before egg-laying (this ejaculation movement by the male before egg-laying is termed ‘pre-oviposition ejaculation’). In pair spawning with sneaker, the sneakers frequently performed pre-oviposition ejaculations, which territorial males never performed. In the field, pre-oviposition ejaculations by sneakers coincided with the leading of females by territorial males. Under artificial conditions, I demonstrated by using electrophoretic paternal analyses that the pre-oviposition ejaculations by the sneakers were more effective than the post-oviposition ejaculations by the territorial males. In addition, there were negative size-dependences in ejaculation achievement rate and fertilization success of the sneaker males.