Assessing the impact of male-killing bacteria on the spread of a sexually transmitted infection
Assessing the impact of male-killing bacteria on the spread of a sexually transmitted infection
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评估男性杀灭细菌对性传播感染传播的影响
DOI：
10.1016/j.anbehav.2015.06.002
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发表时间：
2015
期刊：
影响因子：
2.5
通讯作者：
Pastok D
中科院分区：
文献类型：
--
作者：
Pastok D
我们对性传播感染（STI）的动态感兴趣。我们询问了共生体驱动的雄性稀有性如何影响瓢虫中的STI传播。我们预测，当雄性稀有时，雄性和雌性瓢虫会更频繁地交配。然而，我们的模型预测，男性稀少会加速性传播感染在两性之间的传播。理论预测，性传播感染的流行病学性传播感染（STI）将受到任何改变其宿主交配生物学的因素的影响。在昆虫中，性别比例扭曲共生体的存在可能会调节种群性别比例，改变男性和女性的遭遇率，并创造共生体影响STI动态的潜力。我们使用实验室实验，以探讨如何遗传的男性杀死螺原体细菌共生体将影响流行病学的性传播螨，Coccipolipus coccidamiae在两点瓢虫，Adalia bipunctata。我们比较了1：1和4：1人口性别比下的交配生物学和STI传播，相当于没有男性杀手存在和75%的男性杀手患病率。我们观察到，在严重偏向女性的种群性别比下，雄性有潜力与足够多的雌性交配，以维持较高的雌性交配率。此外，我们观察到，女性更容易重新交配时，男性交配频繁，这表明女性交配率可能实际上是提高女性偏见的人口。从螨的角度来看，这些影响被抵消，至少部分地，减少螨传播最近交配感染的男性。我们模拟了这些过程对STI流行病学的影响，并得出结论，与男性杀死细菌相关的强烈性别比例偏见可能会加速STI感染通过男性和女性宿主的传播。因此，杀死雄性的细菌的存在可能通过STI介导对雌性宿主产生间接影响。
HighlightsWe are interested in sexually transmitted infection (STI) dynamics.We asked how symbiont-driven male rarity would affect STI spread in ladybirds.We predict male and female ladybirds will mate more frequently when males are rare.However, males that mate more often transmit the STI to females less efficiently.Our model predicts male rarity will accelerate STI spread in both sexes.Theory predicts that the epidemiology of sexually transmitted infections (STIs) will be affected by any factor that alters the mating biology of its host. In insects, the presence of sex ratio-distorting symbionts may modulate population sex ratio, altering male and female encounter rates and creating the potential for symbionts to influence STI dynamics. We used laboratory experiments to investigate how a heritable male-killing Spiroplasma bacterial symbiont will affect the epidemiology of a sexually transmitted mite, Coccipolipus hippodamiae in the two-spot ladybird, Adalia bipunctata. We compared mating biology and STI transmission under 1: 1 and 4: 1 population sex ratios, equivalent to no male-killer presence and 75% male-killer prevalence. We observed that males have the potential to mate with enough females to maintain high female mating rate under strongly female-biased population sex ratios. Further, we observed that females remate more readily when males mate frequently, suggesting female mating rate may in fact be raised in female-biased populations. From the mite's perspective, these effects are countered, at least partly, by reductions in mite transmission from recently mated infected males. We modelled the impact of these processes on STI epidemiology, and concluded that strong sex ratio biases associated with male-killing bacteria are likely to speed the spread of STI infection through both male and female hosts. Thus, the presence of the male-killing bacterium is likely to have indirect impacts on female hosts, mediated through the STI.