Attributes of population, Biology

Attributes of Population

The attributes of a population are of two basic types : i) Numerical attributes such as density, mortality (birth rate), mortality (death rate), dispersal and ii) structural attributes like age distribution, dispersion and growth form. Some of the basic attributes of population are briefly described below.

a) Numerical attribute:

Density: number of individuals per unit area.

Natality (Birth rate): the rate at which new individuals are added to a population through reproduction.

Mortality (Death rate): the rate at which individuals are lost from a population by death. ,

Dispersal: the rate at which individuals of a population emigrate or migrate from an area.

b) Structural attributes:

Population growth form: refers to the pattern of population growth. There are two basic patterns of population growth represented by 'T' and "S" shaped growth curves, see Figure for explanation.

841_atributes of population.jpg



Dispersion:
the pattern of distribution of individuals in space, Age distribution: the proportion of individuals of different age groups in a population.

Now you know some of the more important attributes of a population. It is reasonable to ask: How populations are studied? Do all attributes have equal importance, or are some more important than others? In analysing population, the main attributes studied is the density of the population which depends on four parameters: i) natality, ii) mortality, ii) immigration and, iv) emigration.

 

Posted Date: 12/10/2012 4:40:32 AM | Location : United States







Related Discussions:- Attributes of population, Assignment Help, Ask Question on Attributes of population, Get Answer, Expert's Help, Attributes of population Discussions

Write discussion on Attributes of population
Your posts are moderated
Related Questions
Principles of behaviour change communication - BCC should be integrated with program goals from the starting. BCC is a necessary part of diabetes prevention, care and support p

Explain The Estimated Average Intake (EAR)? Considering that the nutrient requirements follow a normal distribution, the EAR is defined as 'the median usual intake that meets t

full variation topic

Define volumetric flasks - Nutritional Biochemistry A volumetric flask is used to make up a solution of fixed volume very accurately. It is calibrated to contain a particular v

Question 1: Describe the process of hearing. The ear consists of three basic parts - the outer ear, the middle ear, and the inner ear. Discuss the process of hearing

Explain the Prokaryotic Cells in details? Prokaryotic Cells: Cells that lack a membrane-bound nucleus and have very few distinguishable internal structures when observed wit

What is the meaning of Narcolepsy This is an inappropriate attack of sleep, the affected person has an overwhelming impulse to fall asleep or simply collapses into sleep at inc

Counselling involves a process, the aim of which is to help others to help themselves by making better choices and becoming better choosers of options. The counsellor's repertoire

Define Precautions for Testing Quality of Water? 1. Handle the sewage water with care as it may contain enteric pathogens. 2. Sewage and pond water should be shaked before i

Determine the parts of plant source The natural food colourants from plant sources are classified into 5 types: a) Anthocyanins, b) Betalaines, c) Carotenoids, d) C