A nudibranch removes rival sperm with a disposable spiny penis
A nudibranch removes rival sperm with a disposable spiny penis
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裸鳃类动物用一次性的带刺阴茎去除竞争对手的精子
作者：
A. Sekizawa;S. Goto;Y. Nakashima
同时雌雄同体，至少在最初，在低密度条件下的选择是有利的，因此可以假设精子竞争在这个性系统中并不重要。然而，许多同时雌雄同体的裸鳃动物同时具有异体精子储存器官（精囊）和异体精子消化器官（交配囊），这表明存在精子竞争的可能性。一种裸鳃目动物，网状色蛛，在每次交配后自动使它的阴茎自动化，并在大约24小时内补充阴茎以进行另一次交配。我们观察到，自动阴茎的表面覆盖着许多向后指向的刺，精子团经常纠缠在刺上。这表明裸鳃动物用其带刺的阴茎将已经储存在交配伴侣精子储存器官中的精子移走。使用6个微卫星标记，我们确定附着在阴茎上的精子群是来自以前参与过交配的个体的异体精子。我们发现网棘蛛使用带刺的阴茎进行精子移除。这些结果表明，该物种在野外的受精竞争相当激烈，交配频率相对较高。
Simultaneous hermaphroditism is, at least initially, favoured by selection under low density — and therefore it can be assumed that sperm competition has little importance in this sexual system. However, many simultaneously hermaphroditic nudibranchs have both an allo-sperm storage organ (the seminal receptacle) and an allo-sperm digesting organ (the copulatory bursa), suggesting the possibility of the occurrence of sperm competition. A nudibranch, Chromodoris reticulata, autotomizes its penis after every copulation and replenishes it within about 24 h to perform another copulation. We observed that the surface of the autotomized penis was covered with many backward-pointing spines and that a sperm mass was often entangled on the spines. This suggests that the nudibranch removes sperm that is already stored in a mating partner’s sperm storage organ(s) with its thorny penis. Using six microsatellite markers, we determined that the sperm mass attached to the penis were allo-sperm originating from individual(s) that had participated in prior copulations. We revealed that C. reticulata performed sperm removal using the thorny penis. These results suggest that competition in fertilization is quite intense and mating frequency in the wild is relatively high in this species.
创伤性分泌物转移是否会影响雌雄同体海蛞蝓的交配角色或生殖输出？
影响因子：
2.3
作者：
Werminghausen;Anthes
通讯作者：
Anthes