Life History Consequences of the Facultative Expression of a Dispersal Life Stage in the Phoretic Bulb Mite (Rhizoglyphus robini).
Life History Consequences of the Facultative Expression of a Dispersal Life Stage in the Phoretic Bulb Mite (Rhizoglyphus robini).
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游动球螨（Rhizoglyphus robini）分散生命阶段的兼性表达的生活史后果。
DOI：
10.1371/journal.pone.0136872
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Smallegange IM
中科院分区：
文献类型：
--
作者：
Deere JA;Coulson T;Smallegange IM
生活史特征在种群动态中起着重要作用，并与在广泛分类群中的扩散存在正相关和负相关。大多数关于生活史特征和扩散之间权衡的无脊椎动物研究都集中在通过飞行进行扩散，而关于生活史权衡如何影响通过其他方式扩散的物种则知之甚少。在这项研究中，我们确定了投资于扩散形态(扩散表达)对雄性二形性鳞叶螨(Rhizoglyphus Robini)生活史特征的影响。本种有一个兼性的幼年生活期(德语)，在此期间个体可以通过变态分散。此外，成年雄性蜘蛛要么是斗士(杀死其他螨类)，要么是良性的扰乱者。在这里，在一项实验中，我们调查了投资于分散对成熟时的大小、性别和雄性形态比以及雌性终生繁殖成功的影响。我们发现生活史特征与散布阶段的表达呈负相关。值得注意的是，所有表现出散布生活阶段的雄性都发展成了有竞争力的斗士，没有一只发展成争夺者。这表明，不应孤立地看待替代的雄性生殖策略和扩散，而应同时考虑。
Life history traits play an important role in population dynamics and correlate, both positively and negatively, with dispersal in a wide range of taxa. Most invertebrate studies on trade-offs between life history traits and dispersal have focused on dispersal via flight, yet much less is known about how life history trade-offs influence species that disperse by other means. In this study, we identify effects of investing in dispersal morphology (dispersal expression) on life history traits in the male dimorphic bulb mite (Rhizoglyphus robini). This species has a facultative juvenile life stage (deutonymph) during which individuals can disperse by phoresy. Further, adult males are either fighters (which kill other mites) or benign scramblers. Here, in an experiment, we investigate the effects of investing in dispersal on size at maturity, sex and male morph ratio, and female lifetime reproductive success. We show that life history traits correlate negatively with the expression of the dispersal stage. Remarkably, all males that expressed the dispersal life stage developed into competitive fighters and none into scramblers. This suggests that alternative, male reproductive strategies and dispersal should not be viewed in isolation but considered concurrently.