Insemination success discrepancy between long-term and short-term copulations in the provisioning shield bug, Parastrachia japonensis (Hemiptera: Cydnidae)
Insemination success discrepancy between long-term and short-term copulations in the provisioning shield bug, Parastrachia japonensis (Hemiptera: Cydnidae)
复制标题
日本甲蝽（半翅目：鲤科）长期和短期交配之间的授精成功率差异
DOI：
10.1007/s101640070021
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发表时间：
2000
影响因子：
0.9
通讯作者：
S. Nomakuchi
中科院分区：
文献类型：
--
作者：
L. Filippi;M. Hironaka;S. Tojo;S. Nomakuchi
在群居盾蝽Parastrachia japonensis Scott（半翅目：Cydnidae）的交配持续时间，是两种类型，更普遍的短期交配（平均，15 s）和长期交配（平均，23 min）。这两种类型被认为是同样有效的授精女性。最近的证据表明，事实上，在两种持续时间类型的交配之间，授精成功率存在差异。我们进行了操纵现场研究，以澄清两种持续时间类型之间的授精成功的差异，并确定是否有一些物理或生理变异的女性或男性，可能会影响女性接受长期交配。研究结果表明，虽然一小部分短期交配导致了一些精子转移，但长期交配是雄性使雌性受精的更有效的方式。此外，女性经历长期交配被发现是在卵巢发育的一个稍微更先进的阶段比那些只经历短期交配，并可能决定是否发生长期交配。男性的大小似乎并不影响交配持续时间。长期交配型是指该物种的实际有效交配持续时间，是所有雌性的目标。可能的因素，可能有助于这两个交配持续时间的患病率进行了讨论。
The duration of copulation in the gregarious shield bug,Parastrachia japonensisScott (Hemiptera: Cydnidae), is of two types, the far more prevalent short-term copulation (average, 15 s) and the long-term coupulation (average, 23 min). Both types were thought to be equally effective in inseminating females. Recent evidence has suggested that there is, in fact, a discrepancy in insemination success between the two duration types of copulations. We carried out manipulated field studies to clarify the difference in insemination success between the two duration types and to determine whether there is some physical or physiological variability in females or males that might affect female receptivity to a long-term copulation. The findings indicated that, although a small percentage of short-term copulations resulted in some sperm transfer, long-term copulations were a far more effective way for males to inseminate females. Further, females experiencing long-term copulations were found to be at a slightly more advanced stage of ovarian development than those experiencing only short-term copulations, and may be deciding whether a long-term copulation occurs. Male size does not appear to affect copulation duration. It is concluded that the long-term type of copulation is the actual effective copulation duration in this species and the objective of all females. Possible factors that might contribute to the prevalence of these two copulation durations are discussed.