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ES Age Structure and Sex Ratios pp 108-109

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ES Age Structure and Sex Ratios pp 108-109
 

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ES Age Structure and Sex Ratios pp 108-109Online version

pages 108 and 109 of the textbook

by rpedelty
1

single older numbers quickly unbalanced ratio distribution decline females growth increase stable rapid group age ages frequencies pre reproductive post males

Different populations have different mixes of ages . Likewise , populations can vary in the proportion of and present . These differences can affect how a population grows .

Populations almost always include individuals of different .

Age structure , or age , describes the relative numbers of organisms of each age within a population .

Age pyramids , or age structure diagrams , are visual tools scientists use to show the age structure of populations . The width of each horizontal bar in the diagram represents the relative size of each .

Individuals capable of having offspring make up the group .

Young individuals who have not yet reached the age where they can have offspring are called - reproductive .

Older individuals past the age of having offspring are called - reproductive .

Age structure diagrams can be effective tools when predicting population .

A population with an even age distribution will likely remain as births keep pace with deaths .

A population made up mostly of individuals past reproductive age will tend to over time .

In contrast , a population of mostly reproductive or pre - reproductive individuals is likely to over time .

Populations that are " bottom heavy " are capable of growth . In this respect , the wide base of an age pyramid is like an oversized engine in a sports car - the bigger the engine , the faster it accelerates .

A population's age structure diagram shows relative of males and females in different age groups .

Populations with more young , prereproductive individuals tend to grow .
Populations with more , post - reproductive individuals tend to decline .

A population's sex is its proportion of males to females .

Age structure diagrams also give information about sex ratio by providing the relative of males and females in each age group .

Sex ratio is an important characteristic for populations of organisms that reproduce sexually and have distinct male and female individuals . For example , in monogamous species ( in which each sex takes a mate ) , a 50 : 50 sex ratio is often ideal .

If there are too many males or females , called an sex ratio , many individuals would be left without a mate - making it much harder for any given individual to reproduce and pass on genes .

 
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