1·They observed no significant effect on songbird nesting success.
他们观察到对鸣禽筑巢成功没有显著影响。
2·Removing waterfowl-nest predators could affect songbird nesting success through subsequent increases in small-mammal populations.
清除水禽巢捕食者可能会通过随后小哺乳动物数量的增加影响鸣禽筑巢的成功。
3·In 1995 and 1996, researchers trapped and removed certain waterfowl-nest predators, primary raccoons and striped skunks, then observed subsequent survival rates for songbird nests.
在1995年和1996年，研究人员捕获并清除了特定的水禽巢穴捕食者，主要是浣熊和条纹臭鼬，然后观察了鸣禽巢穴随后的存活率。
4·Alternatively, small mammals such as mice and ground squirrels are important in the diet of many waterfowl-nest predators and can themselves be important predators of songbird nets.
另外，小型哺乳动物，如老鼠和地松鼠是许多水禽捕食者的重要食物，它们自己也可能是鸣禽网的重要捕食者。
5·The song control system of songbird is mainly composed of direct pathway and acces - sory pathway.
鸣禽发声学习的控制系统主要由一条直接神经通路和一条辅助神经通路组成。