自然死亡率
- 网络natural mortality
![自然死亡率](../cache/1330437.jpg)
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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
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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 .
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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 .
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瞬时自然死亡率(M)均为1.07;
The instantaneous natural ( M ) all 1.07 ;
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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 .
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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 .
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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 .
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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 % .
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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 % .
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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 .
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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 .
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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 .