Nature2014-06-24 4:59 PM

雄性果蝇会改变求偶声音 Dynamic sensory cues shape song structure in Drosophila

论文摘要 

很多动物的雄性都会发出有一定规律的求偶声音,来提高它们与雌性的繁殖成功率,所以叫声结构的变化一直被看做是有害的“噪音”。雄性果蝇也使用求偶声音(是由翅膀振动产生的),Mala Murthy及同事对这些信号的模式(规律)进行了研究。他们发现,雄性会根据视觉输入和自身运动感觉输入信号来调整它们声音的规律(由两个交替的声音模式组成)。雌性对这些努力很敏感,并会根据它们的行为状态和声音特点来改变其行走速度。这些结果与认为求偶声音有一个固定模式这样一个被普遍接受的假设相矛盾,同时也将果蝇确立为用于研究复杂社会环境中快速决策方式的一个有希望的实验模型。

Abstract 

The generation of acoustic communication signals is widespread across the animal kingdom, and males of many species, including Drosophilidae, produce patterned courtship songs to increase their chance of success with a female. For some animals, song structure can vary considerably from one rendition to the next; neural noise within pattern generating circuits is widely assumed to be the primary source of such variability, and statistical models that incorporate neural noise are successful at reproducing the full variation present in natural songs. In direct contrast, here we demonstrate that much of the pattern variability in Drosophila courtship song can be explained by taking into account the dynamic sensory experience of the male. In particular, using a quantitative behavioural assay combined with computational modelling, we find that males use fast modulations in visual and self-motion signals to pattern their songs, a relationship that we show is evolutionarily conserved. Using neural circuit manipulations, we also identify the pathways involved in song patterning choices and show that females are sensitive to song features. Our data not only demonstrate that Drosophila song production is not a fixed action pattern, but establish Drosophila as a valuable new model for studies of rapid decision-making under both social and naturalistic conditions.

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