natural mortality

基本解釋

This year, because of the higher natural mortality among pups in the south, Canada's Department of Fisheries has reduced the quota for the hunt to 270,000 seals, from 335,000 last year.
今年由于南部的小海豹自然死亡率較高，加拿大漁業(yè)部門(mén)已將獵殺海豹配額從去年的335000只減少到270000只。
Evidence suggested that people with bipolar disorderhave a higher mortality from natural causes compared to people in the general population of similar age and gender but without mental illness.
證據(jù)表明雙相情感障礙患者，比起同年齡同性別的無(wú)精神疾病的普通人口，有更高的自然原因引起的死亡率。
A new method for estimating fish natural mortality coefficient(M), based on the extended survivors method, using a catch-at-age data and an abundant index(catch per unit effort, CPUE) was proposed.
基于擴(kuò)展殘存資源量法，提出一種根據(jù)分年齡組漁獲量以及資源量指數(shù)（單位捕撈努力量漁獲量，CPUE）求算魚(yú)類(lèi)的自然死亡系數(shù)（M）的新方法。

Whale researchers use population models that factor a species' reproductive rate and its natural mortality to come up with an estimate of how many are likely dying.
MSN: Feds to reroute SF Bay ships to protect whales