natural mortality meaning in English

自然死亡率

Green turtles normally have a very low survival rate due to predation and natural mortality and mature turtles only lay eggs every two to three years on the average
加上海龟通常每二至三年才繁殖一次，因此非法挖取海龟蛋对海龟种群会造成严重的伤害。
In chapter two , we study a ratio - dependent predator - prey system . we consider the death rate of predator as the natural mortality rate and the other death rate caused by the intraspecies competition or other factors , i . e . , we consider the predator density dependence
对于捕食者的死亡率，我们不仅考虑了捕食者的自然死亡因素，而且还考虑了由于种内之间争夺资源及其它原因引起的死亡等因素，即考虑捕食者之间密度制约因素。