Split sex ratios and genetic relatedness in a primitively eusocial sweat bee
Split sex ratios and genetic relatedness in a primitively eusocial sweat bee
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原始社会性汗蜂的性别比例分裂和遗传相关性
DOI：
10.1007/s00265-020-02944-8
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发表时间：
2020
影响因子：
2.3
通讯作者：
Pennell T
中科院分区：
文献类型：
--
作者：
Pennell T
摘要在真社会性水虻中，蚁后和其辅助后代应倾向于不同的性投资比例。女王应该更喜欢1：1的投资比例，因为它们与两性后代的相关性相等（r= 0.5）。相比之下，助手应该赞成3：1的投资比例对生产的女性育雏。这种冲突的出现是因为帮手与亲姐妹篇（r= 0.75）的关系比与亲兄弟（r= 0.25）的关系更密切。然而，助手应该投资相对更多的男性育雏，如果其殖民地内的相关性不对称减少。这可能是由于殖民地孤儿，多重父权和无关的外来帮手的存在后，女王更换。我们分析了一个前所未有的大量的殖民地（n= 109）从英国人口ofLasioglossum malachurum，专性的eusocial汗蜂，梳理除了这些因素对殖民地水平的投资比率的影响。我们发现，多重亲子关系，无关的外来帮手和殖民地孤儿都很常见。女王权利殖民地投资相对更多的女性比孤儿殖民地，产生分裂的性别比例。然而，投资比率并没有改变，由于多个父亲或外国帮手的存在，减少了包容性健身回报的帮手。女王的控制可能也很重要：帮手很少产下雄性卵，当女王相对于帮手较大时，对雌性育雏的投资也较低。帮助者和他们抚养的后代之间的遗传相关性在一年中为0.43，在另一年中为0.37，这表明生态效益以及相关性效益对于维持帮助行为是必要的。群体水平的性投资比例的变化，以响应相关性不对称可以显着影响包容性健身福利的帮手在eusocialHyattera。在进化性真社会群体中，辅助者能在多大程度上适应性地应对不同来源的亲缘关系不对称性变异，目前还不清楚。使用数据从109个殖民地的汗蜂Lasioglossum malachurum，我们发现，女王的损失，但不是多个父亲或外国帮手的存在，与殖民地的性投资比率。此外，我们量化了平均辅助育雏的遗传相关性，以测试它是否高于单独繁殖下预测（r= 0.5）。值等于或低于r = 0.5表明，相关性的好处本身不能解释帮助行为的维护。群体生活和/或胁迫的生态效益也必须做出贡献。
AbstractIn eusocial Hymenoptera, queens and their helper offspring should favour different sex investment ratios. Queens should prefer a 1:1 investment ratio, as they are equally related to offspring of both sexes (r= 0.5). In contrast, helpers should favour an investment ratio of 3:1 towards the production of female brood. This conflict arises because helpers are more closely related to full sisters (r= 0.75) than brothers (r= 0.25). However, helpers should invest relatively more in male brood if relatedness asymmetry within their colony is reduced. This can occur due to queen replacement after colony orphaning, multiple paternity and the presence of unrelated alien helpers. We analysed an unprecedentedly large number of colonies (n= 109) from a UK population ofLasioglossum malachurum, an obligate eusocial sweat bee, to tease apart the effects of these factors on colony-level investment ratios. We found that multiple paternity, unrelated alien helpers and colony orphaning were all common. Queen-right colonies invested relatively more in females than did orphaned colonies, producing a split sex ratio. However, investment ratios did not change due to multiple paternity or the presence of alien helpers, reducing inclusive fitness pay-offs for helpers. Queen control may also have been important: helpers rarely laid male eggs, and investment in female brood was lower when queens were large relative to their helpers. Genetic relatedness between helpers and the brood that they rear was 0.43 in one year and 0.37 in another year, suggesting that ecological benefits, as well as relatedness benefits, are necessary for the maintenance of helping behaviour.Significance statementHow helping behaviour is maintained in eusocial species is a key topic in evolutionary biology. Colony-level sex investment ratio changes in response to relatedness asymmetries can dramatically influence inclusive fitness benefits for helpers in eusocial Hymenoptera. The extent to which helpers in primitively eusocial colonies can respond adaptively to different sources of variation in relatedness asymmetry is unclear. Using data from 109 colonies of the sweat beeLasioglossum malachurum, we found that queen loss, but not multiple paternity or the presence of alien helpers, was correlated with colony sex investment ratios. Moreover, we quantified average helper-brood genetic relatedness to test whether it is higher than that predicted under solitary reproduction (r= 0.5). Values equal to and belowr= 0.5 suggest that relatedness benefits alone cannot explain the maintenance of helping behaviour. Ecological benefits of group living and/or coercion must also contribute.
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影响因子：
64.8
作者：
通讯作者：
--
微卫星揭示了原始社会性汗蜂 Lasioglossum malachurum 的复杂社会遗传组织和生殖偏差
影响因子：
4.9
作者：
R. Paxton;M. Ayasse;J. Field;A. Soro
通讯作者：
A. Soro
复杂的社会遗传组织和真社会性汗蜂 Lasioglossum malachurum 中无关工蜂的起源
影响因子：
1.3
作者：
A. Soro;A. Soro;Manfred Ayasse;Marion U. Zobel;Robert J. Paxton
通讯作者：
Robert J. Paxton
昆虫社会进化范式的变化：来自 halictine 和 allodapine 蜜蜂的见解。
影响因子：
23.8
作者：
M. Schwarz;M. Richards;B. Danforth
通讯作者：
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DOI：
10.1515/znc-1990-0623
发表时间：
1990
期刊：
Zeitschrift für Naturforschung C
影响因子：
--
作者：
M. Ayasse;W. Engels;A. Hefetz;G. Lübke;W. Francke
通讯作者：
W. Francke