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首页> 外文期刊>Open access Insect Physiology >Function of the dendritic setae in Aedes aegypti mosquito pupae: float hairs don't float
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Function of the dendritic setae in Aedes aegypti mosquito pupae: float hairs don't float

机译：树突科在埃及伊蚊蚊p中的作用：浮毛不浮

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Purpose: Pupal behavior varies with buoyancy, which changes spontaneously at the water's surface and during diving. This behavioral regulation is energy conserving, which is a critical need in the nonfeeding but highly motile pupa. Although adult structures are apparent, there are uniquely pupal structures, including setae (most or all mechanoreceptors), ranging from hair-like to the complex, moveable, bilateral “dendritic setae” on the first abdominal tergum. Our aim has been to elucidate the function of the dendritic setae (“float hairs” in earlier studies). Based on the position and shape of dendritic setae plus ultrastructural evidence of mechanoreception, we hypothesized a buoyancy-sensing function related to bending of the setae as water currents flow over them during descent and ascent.Methods: Using Aedes aegypti, we checked to see whether the dendritic setae are hydrophilic and tested the behavioral effects of their removal. In a preliminary closed-system experiment, a pupa was placed in water in a test tube and a syringe attached in continuity with the air space above the water. When pressure was increased by depressing the plunger, a pupa responded by swimming toward the surface. When negative pressure was applied by lifting the plunger, a pupa actively dove. Using a more sophisticated apparatus with a pressure transducer, we tested the effects of dendritic setae removal on behavior in response to pressure changes.Results: The cuticular surface of the dendritic setae is hydrophilic. No significant differences were found in pupae with or without the dendritic setae relative to dive duration, applied pressure duration, or maximum pressure applied, but response time to pressure change in pupae (males and females) without the setae was significantly increased.Conclusion: Hydrophilic dendritic seta cuticle is consistent with our hypothesis but not with a floatation function. Ablation experiments supported our hypothesis that the dendritic setae are involved with buoyancy sensing by bending in response to directional water currents.
机译：目的：pal的行为随浮力而变化，浮力在水面和潜水过程中自发改变。这种行为调节是节能的，这对于不进食但活动能力强的至关重要。尽管明显有成年结构，但也有独特的p结构，包括刚毛（大多数或所有机械感受器），范围从头发状到第一腹节上复杂，可移动的双侧“树突刚毛”。我们的目的是阐明树突状刚毛（早期研究中的“浮发”）的功能。基于树突状刚毛的位置和形状以及机械感受的超微结构证据，我们假设在下降和上升期间水流流过刚毛时，与刚毛弯曲相关的浮力感应功能。方法：使用埃及伊蚊检查是否树突状刚毛是亲水性的，并测试了其去除的行为效果。在初步的封闭系统实验中，将pa放在试管中的水中，并将注射器与水上方的空气空间连续连接。当通过压下柱塞来增加压力时，a的反应是向表面游动。当通过抬起柱塞施加负压时，a会主动下降。使用带有压力传感器的更先进的设备，我们测试了树突刚毛去除对响应压力变化的行为的影响。结果：树突刚毛的表皮表面是亲水性的。相对于潜水持续时间，施加的压力持续时间或施加的最大压力，有或没有树突状刚毛的p没有发现显着差异，但是没有该刚毛的p（雄性和雌性）对压力变化的响应时间显着增加。树突状角质层表皮与我们的假设相符，但与漂浮功能不符。消融实验支持了我们的假设，即树枝状刚毛通过响应于定向水流而弯曲而参与浮力感测。

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