Ejaculate economics: testing the effects of male sexual history on the trade-off between sperm and immune function in Australian crickets.
Ejaculate economics: testing the effects of male sexual history on the trade-off between sperm and immune function in Australian crickets.
复制标题
DOI：
10.1371/journal.pone.0030172
复制
发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Simmons LW
中科院分区：
文献类型：
--
作者：
Dowling DK;Simmons LW
对男性性特征的投资和免疫功能之间的权衡为一些最著名的性选择模型提供了基础。男性射精的交配后性选择非常激烈，因此在射精投入和免疫系统之间应该进行权衡。这种权衡的例子是存在的，包括澳大利亚蟋蟀（Teleogryllus oceanicus）的精子质量和免疫力之间的权衡。在这里，我们探讨了这种权衡的动态，研究了性互动水平的增加对男性精子随时间的活力的影响，以及随之而来的对免疫功能的影响。雄性被分配接受一种治疗，即与性未成熟、性成熟但无法交配或性成熟但能够交配的雌性同居。然后在两个时间点评估每只雄性的精子活力：治疗后第 6 天和第 13 天，以及第 13 天的免疫功能。精子活力在各个时间点上均有所下降，但仅限于接受涉及性成熟雌性的治疗课程的雄性。两个性成熟类别的这种下降幅度相似，表明表现出高精子活力的成本主要是通过交配前投资水平产生的。与未成熟雌性接触的雄性在两个时间点都产生了低活力的精子。尽管我们在第 13 天时证实精子活力和裂解活性（对细菌感染的免疫反应的衡量标准）之间存在弱负相关关系，但这种关系在整个交配处理过程中并未改变。我们的研究结果强调，精子活力是一种不稳定的特性，生产成本高昂，并且受这些蟋蟀的战略分配影响。
Trade-offs between investment into male sexual traits and immune function provide the foundation for some of the most prominent models of sexual selection. Post-copulatory sexual selection on the male ejaculate is intense, and therefore trade-offs should occur between investment into the ejaculate and the immune system. Examples of such trade-offs exist, including that between sperm quality and immunity in the Australian cricket, Teleogryllus oceanicus. Here, we explore the dynamics of this trade-off, examining the effects that increased levels of sexual interaction have on the viability of a male's sperm across time, and the concomitant effects on immune function. Males were assigned to a treatment, whereby they cohabited with females that were sexually immature, sexually mature but incapable of copulation, or sexually mature and capable of copulation. Sperm viability of each male was then assessed at two time points: six and 13 days into the treatment, and immune function at day 13. Sperm viability decreased across the time points, but only for males exposed to treatment classes involving sexually mature females. This decrease was similar in magnitude across both sexually mature classes, indicating that costs to the expression of high sperm viability are incurred largely through levels of pre-copulatory investment. Males exposed to immature females produced sperm of low viability at both time points. Although we confirmed a weak negative association between sperm viability and lytic activity (a measure of immune response to bacterial infection) at day 13, this relationship was not altered across the mating treatment. Our results highlight that sperm viability is a labile trait, costly to produce, and subject to strategic allocation in these crickets.
登录
查看更多内容
影响因子：
2.1
作者：
Gershman, S. N.;Barnett, C. A.;Sakaluk, S. K.
通讯作者：
Sakaluk, S. K.
影响因子：
1.5
作者：
Drnevich, JM;Barnes, AI;Siva-Jothy, MT
通讯作者：
Siva-Jothy, MT
影响因子：
2.9
作者：
Dowling, Damian K.;Meerupati, Tejashwari;Arnqvist, Goran
通讯作者：
Arnqvist, Goran
影响因子：
2.2
作者：
Adamo, SA
通讯作者：
Adamo, SA
影响因子：
56.9
作者：
HAMILTON, WD;ZUK, M
通讯作者：
ZUK, M