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首页> 外文期刊>Journal of Insect Physiology >Pump out the volume - the effect of tracheal and subelytral pressure pulses on convective gas exchange in a dung beetle, Circellium bacchus (Fabricus).
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Pump out the volume - the effect of tracheal and subelytral pressure pulses on convective gas exchange in a dung beetle, Circellium bacchus (Fabricus).

机译：抽出体积-气管和鞘膜下压力脉冲对甲（bacellium bacchus （Fabricus）中对流气体交换的影响）。

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摘要

Many flightless beetles like the large apterous dung beetle Circellium bacchus, possess a subelytral cavity (SEC) providing an extra air space below the elytra which connects to the tracheal system (TS) via metathoracic and abdominal spiracles. By measuring subelytral and intratracheal pressure as well as body movements and gas exchange simultaneously in a flow-through setup, we investigated the contribution of convection on Circellium respiratory gas exchange. No constriction phase was observed. TS and SEC pressures were always around atmospheric values. During interburst phase open abdominal spiracles and a leaky SEC led to small CO2-peaks on a continuous CO2 baseline, driven by intermittent positive tracheal pressure peaks in anti-phase with small negative subelytral pressure peaks caused by dorso-ventral tergite action. Spiracle opening was accompanied by two types of body movements. Higher frequency telescoping body movements at the beginning of opening resulted in high amplitude SEC and TS pressure peaks. High frequency tergite movements caused subelytral pressure peaks and led to a saw tooth like CO2 release pattern in a burst. We propose that during the burst open mesothoracic spiracles increase the compliance of the subelytral cavity allowing big volumes of tracheal air being pulled out by convection.
机译：许多不会飞的甲虫，例如大型虫（Circellium bacchus），都具有鞘膜下腔（SEC），在鞘管下方提供了额外的空气空间，该空间通过后胸腔和腹腔气门与气管系统（TS）连接。通过在流通装置中同时测量气膜下和气管内压力以及人体运动和气体交换，我们研究了对流对 Circellium 呼吸气体交换的贡献。没有观察到收缩期。 TS和SEC压力始终在大气压附近。在爆发期，腹部气门开放和SEC泄漏导致连续CO 2 基线上的小CO 2 -峰，这是由于反相的间歇性气管正压峰值驱动由背腹腹盖的辉石作用引起的小的负皮下压力峰值。急速打开伴随着两种类型的身体运动。在打开开始时较高频率的伸缩式车身运动会导致SEC和TS压力峰值出现高振幅。高频辉铁矿的运动引起亚液面压力峰值，并突然形成锯齿状的CO 2 释放模式。我们建议，在爆发期间，中胸廓气门增加对翼下腔的顺应性，从而允许通过对流抽出大量气管空气。

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