当前位置: X-MOL 学术Physiol. Entomol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Onset of seasonal metabolic depression in the Antarctic midge Belgica antarctica appears to be independent of environmental cues
Physiological Entomology ( IF 1.5 ) Pub Date : 2019-11-01 , DOI: 10.1111/phen.12311
Drew E. Spacht 1 , J. D. Gantz 2 , Richard E. Lee 2 , David L. Denlinger 1, 3
Affiliation  

Seasonal progression is tracked in most animals by changes in daylength, thus allowing reliable synchrony with abundant food and favourable developmental conditions. In polar regions, daylength varies extensively, fluctuating at the highest latitudes from persistent light to persistent dark. The Antarctic midge Belgica antarctica has a narrow seasonal window in which to feed and develop, and previous work shows that this insect, despite having the elements of a circadian clock, remains continuously active when temperatures are permissive. The present study aims to clarify seasonal tracking in B. antarctica during the austral summer by monitoring oxygen consumption rates in a field population and in experimental groups exposed to shortened daylength, dehydration and chilling. Remarkably, during March, coordinated decreases in oxygen consumption are observed, ranging from 18% to 42%, in all treatment groups, indicating an anticipatory response to seasonal change regardless of the environmental cues. These results suggest that B. antarctica relies on an intrinsic mechanism to program metabolic depression at the onset of the long austral winter.

中文翻译:

南极蠓 Belgica antarctica 季节性代谢抑制的发生似乎与环境线索无关

大多数动物通过日长的变化来跟踪季节性进程,从而与丰富的食物和有利的发育条件实现可靠的同步。在极地地区,昼长变化很大,在最高纬度从持续亮到持续黑暗波动。南极蠓 Belgica antarctica 有一个狭窄的季节窗口供其觅食和发育,之前的研究表明,这种昆虫尽管具有生物钟的元素,但在温度允许的情况下仍会持续活跃。本研究旨在通过监测野外种群和暴露于缩短的日照、脱水和寒冷环境的实验组的耗氧率,阐明南极夏季 B. antarctica 的季节性跟踪。值得注意的是,在三月份,在所有治疗组中都观察到耗氧量的协调下降,范围从 18% 到 42%,表明无论环境因素如何,对季节变化的预期反应。这些结果表明 B. antarctica 依赖于一种内在机制来在漫长的南方冬季开始时对代谢抑制进行编程。
更新日期:2019-11-01
down
wechat
bug