But either heavy grazing or no grazing at all resulted in more females than males.

但是重度放牧或完全无放牧地区都导致了雌鸟比雄鸟更多。

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Trees are sparse on grasslands due to seasonal floods and droughts, heavy grazing, and fires。

由于季节性旱涝，过度放牧和火灾，这里树木稀少。

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There were higher selective in light gazing because of the sufficient food supply and less selective in heavy grazing due to less plant species.

轻度放牧区食物充足，绵羊的选择性采食行为较明显，重度放牧区植物稀疏，食物匮乏；

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