Egg trading in the simultaneously hermaphroditic polychaete worm Ophryotrocha gracilis (Huth)
Egg trading in the simultaneously hermaphroditic polychaete worm Ophryotrocha gracilis (Huth)
复制标题
同时雌雄同体多毛类蠕虫 Ophryotrocha gracilis (Huth) 的卵交易
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
F. Turri
中科院分区：
文献类型：
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作者：
G. Sella;M. Premoli;F. Turri
Ophryotrocha gracilis (Huth 1934) 是一种同时雌雄同体的多毛类蠕虫，具有体外受精和短暂的先雄期。该物种的交配系统似乎符合导致鸡蛋交易行为建立的条件。实验表明，交配是由两个同时雌雄同体的动物成对进行的。性别角色依次交替，避免自体受精。通过在多个小尺寸卵窝中产卵并降低配对的繁殖成功率（其中两个伴侣之一不进行卵子交换），卵子往复在进化上保持稳定。在O. gracilis 群体培养物中，雌雄同体产卵的频率约为50%。如此高的配偶可用性使 O. gracilis 的雌雄同体预先适应了频繁更换伴侣，并减少了对亲代照顾的投资，这与在另一种以鸡蛋贸易、同时也是雌雄同体的物种 O. diadtma 中观察到的情况相反。 O. diadtma 实验室种群中雌雄同体产卵的频率仅为 17%。词：[Bthav Ecol 8:83-86 (1997)]
Ophryotrocha gracilis (Huth 1934) is a simultaneously hermaphroditic polychaete worm with external fertilization and a brief protandrous phase. The mating system of this species seems to meet conditions leading to the establishment of egg-trading behavior. Experiments showed that mating occurs in pairs composed of two simultaneous hermaphrodites; sex roles are se- quentially alternated and self-fertilization is avoided. Egg reciprocation is kept evolutionarily stable by laying eggs in multiple, small-sized egg clutches and reducing the reproductive success of pairs in which one of the two partners does not reciprocate egg exchange. The frequency of ovigerous hermaphrodites in mass cultures of O. gracilis is about 50%. Such a high mate availability preadapts hermaphrodites of O. gracilis to change partners very frequently and to reduce investment in parental care, contrary to what is observed in another egg-trading, simultaneously hermaphroditic species, O. diadtma. Laboratory populations of O. diadtma have a frequency of only 17% ovigerous hermaphrodites. words: [Bthav Ecol 8:83-86 (1997)]