Attributes of population, Biology

Assignment Help:

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.

 


Related Discussions:- Attributes of population

Mrna molecule codifies only one kind of protein, Q. An mRNA molecule codifi...

Q. An mRNA molecule codifies only one kind of protein? Eukaryotic cells have monocistronic mRNA, that is each mRNA codifies only one polypeptide chain, Prokaryotes can present

Define nutritional requirements of fats and oils, Define Nutritional Requir...

Define Nutritional Requirements of Fats and Oils? As with the other macronutrients, we do compute requirements of visible fats too for all age groups and give guidelines for se

What is available soil nutrient, Availability of nutrients in soils  Th...

Availability of nutrients in soils  The productivity of a crop depends largely on the nutrients discussed in the previous section. It is important to find out methods which wil

High proportion of reticulocytes, A patient has a low red blood cell count,...

A patient has a low red blood cell count, and microscopic examination reveals an abnormally high proportion of circulating reticulocytes. Upon subsequent examination, the patient i

Briefly explain endocrine system, Q What is the constitution of the endocri...

Q What is the constitution of the endocrine system? The endocrine system is constituted by the hormones and the endocrine glands they secrete. Q. What is the histological n

Dfine integrated child development services (icds), Dfine Integrated Child ...

Dfine Integrated Child Development Services (ICDS)? The adolescent girl scheme under ICDS intends to cover school dropout girls, 11-18 years in age with a view to meet their ne

Define characteristics of prebiotics, Define characteristics of prebiotics?...

Define characteristics of prebiotics? Characteristics of prebiotics Are non-digestible dietary/food ingredients Are not hydrolyzed/absorbed in the upper GIT, reach

What are the elements that form the middle ear, Q. What are the elements th...

Q. What are the elements that form the middle ear? What are the names of the three middle ear ossicles that participate in the phonosensitivity? The middle ear is formed by the

How to investigate aortic stenosis by echo cardiography, Q. How to investig...

Q. How to investigate aortic stenosis by Echo Cardiography? 2D Echo cardiogram shows the number of cusps. But presence of raphae and distorted anatomy due to calcification may

Marek''s disease (md), M a r e k ' s disease (MD) It is a lymphop...

M a r e k ' s disease (MD) It is a lymphopoliferative disease of domestic chicken caused by a herpes virus. Of the known 3 serotypes of MDV, Serotype I includes all the o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd