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### 在年龄结构化动物种群的分析过程中常见的几种错误

Richard B．Harris, Lee H．Metzgar

1. 美国蒙大那大学蒙大那合作野生动物研究单位
• 出版日期:2006-07-29 发布日期:2007-09-13

### 0N S0ME C0MM0N ERRORS IN ANALYSIS OF AGE-STRUCTURED P0PULATIONS

Richard B．Harris, Lee H ． M etzgar

• Online:2006-07-29 Published:2007-09-13

Abstract: Analyzing age-structured population data can be useful in deducing factors affectingpopulation trend，and projecting future population levels．However，in a review of recent literature,we noted 3 errors jn analyses，a11 of which may lead to erroneous inferences．
(1)In life-table analyses，it is incorrect to equate Sx(the proportion of animals
in each age-class x) with lx (the proportion of a cohort surviving to the beginning of
age-class x) ．unless it is known that r=0 and the population has achieved a stable age distribution．However， if these two conditions hold， the lifetable cannot ‘calculate’ r; rather， knowledge of r is a prerequisite to building the life-table．
(2)In building a life-table，problems can arise when pooling birth rates across
age-categories of mothers without accounting for mortality of mothers within the pooled age category．If resultant birth rates are not discounted in some way，resulting estimates of r will be biased in a positive direction．
(3) When calculating the finite growth rate λusing a Leslie matrix。it is incorrect to substitute mx for Fx．The former is the more commonly obtained term (number of female young per female of age x just after the birth season); the latter is Leslie's term，which is more complex and difficult to gather in the field．
We discuss implications of these errors and suggest ways to avoid making them.