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首页> 外文期刊>The American Naturalist: Devoted to the Conceptual Unification of the Biological Sciences >Butterfly selected lines explore the hormonal basis of interactions between life histories and morphology
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Butterfly selected lines explore the hormonal basis of interactions between life histories and morphology

机译：蝴蝶选择的线条探索生活史和形态之间相互作用的激素基础

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Hormonal mechanisms underlie many life-history traits and their interactions. We studied the role of ecdysteroids with regard to wing pattern and development time of the polyphenic butterfly Bicyclus anynana. Ecdysteroid titers and sensitivity to ecdysone injection were assayed for two-trait selected lines ( ventral eyespot size and development time concurrently). These two traits are genetically and phenotypically coupled, having a common endocrinal basis. Two-trait selection had been applied both antagonistically ( opposite the correlation) and synergistically ( in the same direction as the correlation). Although selected lines had diverged most in eyespot size, the widest differences in timing of ecdysteroid titers were observed between the development time selection regimes; fast selected lines had an earlier hormonal increase after pupation than slow selected lines ( even when corrected for differential pupal times). This endocrine peak was also earlier for females than for males. Furthermore, sensitivity to ecdysone injection as measured by a subsequent decrease in pupal time was significantly lower for slow selected lines than for fast or unselected lines. We conclude that the observed response in eyespot size to artificial selection must have been achieved via alteration of, or selection on, other developmental mechanisms, because the dynamics of the alternative, hormonal, pathway were dictated by development time selection. The developmental system is flexible enough to allow evolution in directions opposing the correlation between wing pattern and developmental time, and responses to selection are not constrained by a shared hormonal system.
机译：激素机制是许多生命历史特征及其相互作用的基础。我们研究了蜕皮类固醇在多态蝴蝶Bicyclus anynana的翼型和发育时间方面的作用。测定了蜕皮激素的滴度和对蜕皮激素注射的敏感性，以选择两个特征的品系（腹侧眼点大小和同时发育时间）。这两个特征在基因和表型上具有共同的内分泌基础。两性选择已被拮抗地（与相关性相反）和协同地（与相关性相同的方向）应用。尽管选择的品系在眼点大小上差异最大，但在发育时间选择方案之间观察到蜕皮甾类滴度的时间差异最大。快选系化p后的荷尔蒙分泌要比慢选系早（即使校正了不同的p时间）。女性的内分泌高峰也早于男性。此外，慢速选择的品系对蜕皮激素注射的敏感性通过随后的p时间的减少而显着低于快速或未选择的品系。我们得出的结论是，必须通过改变或选择其他发育机制来实现观察点对人工选择的反应，因为替代激素途径的动力学是由发育时间选择决定的。发育系统足够灵活，可以沿与机翼模式和发育时间之间的相关性相反的方向进化，并且对选择的反应不受共享荷尔蒙系统的限制。

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