在新英格兰北部,鸟的数量和每一只鸟所能取食到云杉卷叶蛾幼虫和蛹的数量是随昆虫种群数量的增加而增加。鸟类捕食流行性种群约2％,过渡性种群约23％,地方性种群约81％,有地方性卷叶蛾种群的林分中,黑斑森莺和纳什维尔鸣鸟(Nashville Warblers。)金冠鹪鹩和白颈麻雀、柳山雀是主要的捕食者,鸟群作为最有效的云杉卷叶蛾的捕食者,可 In northern New England, the number of birds and the number of larvae and pupae that each bird can feed on the leaf spur moth larvae increase as the insect population increases. About 2% of prey species are predators, about 23% are transitional and about 81% are endemic. Among the species with endemic leaf roller moths, Black-spotted warbler and Nashville Warblers.鹩 and white-necked sparrows, willow chickadees are the predators, flocks of birds as predators of the most effective spruce-leaf moths may