For M. phoebe, to decrease grazing, especially its effects on the sourcepopulation during the post-hibernating larval group stage, is crucial for its population restoration and growth.
在春季减少源斑块内的放牧，对于以源-汇集合种群形式存在的大网蛱蝶种群恢复和增长十分必要；
2
Population growth in Africa has long been a source of concern, as food and fresh water supplies are strained, but Kent argues that Africa's plentiful young may actually be viewed as its strength.