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PDF Lect06 Life Tables 1

PDF Lect06 Life Tables 1 - INSECT ECOLOGY...

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Lecture 6, page 1 INSECT ECOLOGY -- ENTOMOLOGY/BIOLOGY 127 LECTURE 6 -- LIFE TABLES: Part 1 I. Introduction A. In population ecology, including insect ecology, one common technique used to summarize and organize population data, as well as to estimate demographic parameters, is the construction and analysis of life tables. This is the analysis of survival and reproduction of (insect) populations, and permits the estimation of growth parameters, mean generation time, etc. B. This topic (life tables) covers much ground in insect ecology, and we will divide the topic into two parts: Part 1: Age-specific life tables Part 2: Stage-specific life tables II. Life Tables - Part 1. Age specific survivorship and reproduction curves A. This topic deals with the analysis of age-specific birth and death rates. There are, in general, two types of data sets which yield these data. 1. An age-specific ( horizontal, cohort ) life table is based on recording the survival and reproduction of a single observed cohort of individuals from the time it is oviposited as a group of eggs until the last adult dies. This is the most common (and useful) type in insect ecology. 2. A time-specific ( vertical, static ) life table is based on the fate of an imaginary cohort. It is constructed by determining the age structure, at a point in time, of a sample of individuals from what is assumed to be a stationary population with considerable overlapping of generations. Not used very often in insect ecology. generation 1 generation 2 generation 3 generation 4 generation 5 age x
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Lecture 6, page 2 B. Expressing survival in age-specific terms 1. The survivorship curve: The number of living insects in a cohort are plotted against age. The shape of the curve determines the distribution of mortality over age. Three
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PDF Lect06 Life Tables 1 - INSECT ECOLOGY...

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