密度制约和功能性反应对福寿螺性比的影响

福寿螺（pomacea canaliculata）是世界100种恶性入侵物种之一，对我国的农业生产、生态系统功能和国民健康造成了严重的危害。福寿螺自然种群的一个重要特征是雌性比例高于雄性，这可能是其种群快速增长、形成入侵的一个机制。然而，这种雌性居多的成体性比（ASR）现象的成因迄今没有很好的解释。本研究从密度制约和功能性反应的角度，采用野外调查、温室控制实验和模型模拟相结合的方法，分析这两个过程对福寿螺雌雄群体影响的差异，阐明福寿螺成体性比雌性居多的形成机制。

Pomacea canaliculata, one of '100 of the World's Worst Invasive Alien Species', has caused serious harm on agricultural production, ecosystem function and national health in Chinese Mainland. One of the most important characteristics of this species is female-biased adult sex ratio (ASR), which possibly serve as one mechanism contributing to rapid population growth and invasion. However, the causes of the biased ASR in natural condition remain poorly understood. Herein, using the combination of field surveys, greenhouse manipulative experiments and computer simulations, we analyze the sexual differences of the effects of density dependence and functional response on Pomacea canaliculata to clarify the formation mechanism of the female-biased ASR.