期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 267, 期 1447, 页码 1005-1010出版社
ROYAL SOC
DOI: 10.1098/rspb.2000.1103
关键词
circadian rhythms; locomotor and egg-laying activity; Drosophila parasitoids; interspecific competition; Leptopilina; Asobara
Most organisms show self-sustained circadian oscillations or biological clocks which control their daily fluctuations in behavioural and physiological activities. While extensive progress has been made in understanding the molecular mechanisms of biological clocks, there have been few clear demonstrations of the fitness value of endogenous rhythms. This study investigated the adaptive significance of circadian rhythms in a Drosophila parasitoid community. The activity rhythms of three sympatric Drosophila parasitoids are out of phase, the competitively inferior parasitoid species being active earlier than the superior competitor. This temporal segregation appears at least partiality determined by endogenous periods of the clock which also vary between species and which correlate the time of activity. This earlier activity of the inferior competitor significantly reduces its intrinsic competitive disadvantage when multiparasitism occurs, thus suggesting that natural selection acting on the phase of the rhythm could substantially deviate the endogenous period from the optimal ca. 24h period. This study demonstrates that temporal segregation of competing species could be endogenously controlled, which undoubtedly favours their coexistence in nature and also shows how natural selection can act on biological clocks to shape daily activity patterns.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据