Anoxia tolerance of con-familial tiger beetle larvae is associated with differences in energy flow and anaerobiosis
Anoxia tolerance of con-familial tiger beetle larvae is associated with differences in energy flow and anaerobiosis
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DOI：
10.1007/s003600000104
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发表时间：
2000-06-01
期刊：
影响因子：
--
通讯作者：
Hand, SC
中科院分区：
文献类型：
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作者：
Hoback, WW;Podrabsky, JE;Hand, SC
在这项研究中，我们比较了两种虎甲在缺氧条件下的存活、散热和厌氧生化特征。一个物种通常经历降雨和积雪融化的环境浸泡(Cicindela Togata)，而另一个物种(Amblycheila Lindriformis)的栖息地不容易发生洪水。圆柱藻的祖先属在25℃下仅能耐受2天的缺氧，这些幼虫在缺氧后立即失去运动能力，组织中的ATP浓度在12小时内急剧下降，并迅速产生大量的乳酸。与之相反，金龟子幼虫耐缺氧5天。与圆柱形沙门氏菌相比，热耗散的下调幅度更大(分别为标准常氧速率的3.4%和14%)，运动能力得到保持，正常氧水平的ATP至少维持24小时。乳酸直到进入缺氧阶段才积累，同时也产生了大量的丙氨酸。这项研究提供了证据，表明老虎甲虫对缺氧的生理反应不同，并且这些差异与洪水风险和物种分布有关。
In this study, we compared survivorship, heat dissipation and biochemical features of anaerobiosis of two tiger beetle species (Coleoptera: Cicindelidae) exposed to anoxia. One species commonly experiences environmental immersion from rainfall and snowmelt (Cicindela togata), and the habitat of the other (Amblycheila cylindriformis) is not prone to flooding. The ancestral genus, A. cylindriformis, survives anoxia for only 2 days at 25 degrees C, In response to anoxia, these larvae immediately lose locomotory abilities, tissue concentrations of ATP fall precipitously within 12 h, and significant amounts of lactate are quickly produced. In contrast, C, togata larvae tolerate anoxia for 5 days. Heat dissipation is downregulated to a greater degree than that seen in A. cylindriformis (3.4% versus 14% of standard normoxic rate, respectively), the ability for locomotion is maintained and normoxic levels of ATP are defended for at least 24 h. Lactate is not accumulated until well into anoxic bout, and significant amounts of alanine are also produced. This study provides evidence that tiger beetles differ in physiological responses to anoxia, and that these differences are correlated with flooding risk and with species distribution.