True polyandry and pseudopolyandry: why does a monandrous fly remate?
True polyandry and pseudopolyandry: why does a monandrous fly remate?
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DOI：
10.1186/1471-2148-13-157
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发表时间：
2013-07-25
影响因子：
3.4
通讯作者：
Price TA
中科院分区：
文献类型：
--
作者：
Fisher DN;Doff RJ;Price TA
雌性再交配的速度对一个物种有重要的影响，从影响家庭内的冲突和合作，到种群生存能力和基因流动。然而，确定一个物种中一妻多夫的水平可能很困难，许多物种的交配系统信息都是基于一个单一的实验，或者完全没有。在这里，我们研究了果蝇Drosophila subobscura的交配系统。来自英国、西班牙和加拿大的报告表明D. subobscura是完全单雄的，没有女性remating。然而，在希腊的工作表明，23%的女性再婚。我们研究了女性D的意愿。subobscura在实验室中在一系列条件下重新交配，使用来自希腊和英国的苍蝇。我们区分了假一妻多夫和真一妻多夫，假一妻多夫是指雌性在第一次交配无效后重新交配，无法使卵子受精，而真一妻多夫是指雌性即使从前一次交配中获得了合适的精子也会重新交配。我们发现，女性一妻多夫的比例很低（4%），人口之间没有差异。真正的一妻多夫率受温度的影响，但不受饥饿的影响。假一妻多夫是真正一妻多夫的三倍，大多数表现出假一妻多夫的女性在第一次交配失败后第一次有机会交配。然而，尽管缺乏人口之间的一妻多夫制的差异，我们确实发现男性在交配前暴露于其他男性的反应方式存在差异。与以前的工作一致，英国苍蝇通过增加交配持续时间来回应一个或多个竞争对手，这种反应以前被认为是由精子竞争驱动的。希腊男性只有在接触到四个或更多的竞争对手时才会表现出交配持续时间的增加。这表明D.由于精子竞争很少，而且在整个种群中，对竞争对手的反应与交配系统没有相关性，因此，subobscura与精子竞争无关。这些结果说明了在确定一个物种的交配系统的困难，即使是一个众所周知的和一个优秀的实验室物种，结果是高度依赖于用于测定的行为，和人口使用的条件。
The rate of female remating can have important impacts on a species, from affecting conflict and cooperation within families, to population viability and gene flow. However, determining the level of polyandry in a species can be difficult, with information on the mating system of many species being based on a single experiment, or completely absent. Here we investigate the mating system of the fruit fly Drosophila subobscura. Reports from England, Spain and Canada suggest D. subobscura is entirely monandrous, with no females remating. However, work in Greece suggests that 23% of females remate. We examine the willingness of female D. subobscura to remate in the laboratory in a range of conditions, using flies from both Greece and England. We make a distinction between pseudopolyandry, where a female remates after an ineffective first mating that is incapable of fertilising her eggs, and true polyandry, where a female remates even though she has received suitable sperm from a previous mating. We find a low rate of true polyandry by females (4%), with no difference between populations. The rate of true polyandry is affected by temperature, but not starvation. Pseudopolyandry is three times as common as true polyandry, and most females showing pseudopolyandry mated at their first opportunity after their first failed mating. However, despite the lack of differences in polyandry between the populations, we do find differences in the way males respond to exposure to other males prior to mating. In line with previous work, English flies responded to one or more rivals by increasing their copulation duration, a response previously thought to be driven by sperm competition. Greek males only show increased copulation duration when exposed to four or more rival males. This suggests that the response to rivals in D. subobscura is not related to sperm competition, because sperm competition is rare, and there is no correlation of response to rivals and mating system across the populations. These results illustrate the difficulties in determining the mating system of a species, even one that is well known and an excellent laboratory species, with results being highly dependent on the conditions used to assay the behaviour, and the population used.
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影响因子：
4.9
作者：
Bretman, A;Tregenza, T
通讯作者：
Tregenza, T
影响因子：
56.9
作者：
Balanya, Joan;Oller, Josep M.;Serra, Luis
通讯作者：
Serra, Luis
影响因子：
2.1
作者：
Fricke, C.;Bretman, A.;Chapman, T.
通讯作者：
Chapman, T.
影响因子：
2.5
作者：
Harano, T;Miyatake, T
通讯作者：
Miyatake, T
DOI：
10.1098/rspb.2008.1878
发表时间：
2009-05-07
影响因子：
4.7
作者：
Bretman, Amanda;Fricke, Claudia;Chapman, Tracey
通讯作者：
Chapman, Tracey