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
Q. Define Direct Visualisation of Coronary Arteries? Ans. Coronary arteries cad be directly visualized using two-dimensional echocardiography, especially in patients with

Mineral supplements There are two major classes of mineral sources: inorganic and organic. Organic complexes, however, have been shown to be more effectively absorbed by the a

What is the disease caused by vitamin D deficiency? Which tissue does it affect? The lack of vitamin D causes the disease called as rickets (rachitis), characterized by decalci

Tolerance Range - Ecosystem Organisms are able to survive only within certain maximum and minimum limits with respect to each environmental factor such as water, light and tem

Why the orange trees are often sprayed with water? Although it is grossly counter-intuitive, whenever citrus groves are in risk of experiencing below-freezing temperatures, the

organisms and their excretory organelles

Define the Management of Obesity? Management of obesity should be taken up with a clear understanding of the harsh realities of the problem and its outcome. It may be a frustra

An account of characters of mollusca

Water Relations in Terrestrial Environment Insects are the largest group of metazoans which have most successfully invaded the terrestrial environment. In addition, most arach

Adverse Effects of Ribavirin  Systemic ribavirin has been associated with hemolytic anemia. Oral ribavirin plus interferon appears to cause a higher incidence of cough, pruritu