自然死亡率

应用世代分析法估算鱼类自然死亡率的初步研究

A Preliminary Study on the Estimation of Natural Mortality Using Cohort Analysis Method

模型中包括了自然死亡率，天敌捕食率对于种群变化的影响，反映了个体发育的差异对于群体结构的影响。

The influence of natural mortality and predacious rate on population dynamics was included in this model , and further indicated the influence of differences of individual development on the population structure .

当CV等于20%时，在4种模拟渔业中鱼类各龄自然死亡率（Ma）的EP均小于10%。

When the CVs were 10 % the EPs of the estimated M_a were lower than 10 % for the four simulated fisheries .

瞬时自然死亡率（M）均为1.07；

The instantaneous natural ( M ) all 1.07 ;

风险回避在25岁左右开始起作用，而自然死亡率开始上升。

Risk-aversion begins to kick in around 25 , and natural causes start to rank .

而老年人因病死亡率比自然死亡率高之甚多。

And old peoples diseased death rate is much higher than the natural death rate .

作为一个体育人，摆在我们面前的任务很艰巨，那就是如何战胜疾病，提高自然死亡率。

As a sports person . The task in front of us is very arduous . That is how to overcome the disease and improve the natural death rate .

单纯疱疹病毒性脑炎是成人中最常见的散发性、非流行性病毒性脑炎，占急性病毒性脑炎的10%～20%，自然死亡率60%～80%。

Herpes Simplex encephalitis ( HSE ) accounts for 10 % ~ 20 % of acute viral encephalitis which is a sporadic , non-epidemic and the most common viral encephalitis in adults . If untreated , the mortality will be approximately 60 % ~ 80 % .

雌花数少，第1雌花节位高，雌花蕾自然死亡率高，雌雄花比小，坐果率低，仅为26.7%，其中心可溶性固形物含量在1.5%～3.0%之间，无食用价值。

The node of the 1st female flower was higher , and the natural mortality of female flower buds was higher . The percentage of fruit set was lower ( 26.7 % ) . The content of central soluble solids varied from 1.5 % to 3.0 % .

战争，自然灾害都是死亡率爆涨的原因。

Wars and natural disasters are both the reasons for the mortality rate to skyrocket .

就如我们看到的，哺乳动物在自然环境中的死亡率随着物种的变化而变化，而这正决定了进化趋势。

As we will see , the mortality of mammals in their natural environments varies considerably between species , and this determines evolutionary trends .

通过在洋白蜡和水曲柳等受害林地进行解剖调查，发现白蜡窄吉丁自然种群中幼虫的自然感病死亡率为6.3%，均为真菌感染，没有发现病原细菌和病毒感染致死的情况。

The results showed that there is 6.3 % dead larvae caused by infection of pathogenic fungi in EAB nature population , no finding that of pathogenic bacteria or virus .