Age distribution - population parameters and regulation, Biology

Assignment Help:

Age Distribution - Population Parameters and Regulation

It is obvious that individuals in a population will be of different age groups. Relative numbers of young and old individuals in a population will significantly influence the behaviour of a population such as natality and mortality. The age structure of any population can be classified into three categories, i.e. pre-reproductive, reproductive and post-reproductive ages. Mortality usually varies with age as chances of death are more in early pre- reproductive and late post-reproductive periods. Likewise, natality is restricted to the reproductive age of individuals in a population.

The relative duration of these ages in proportion to life span is different in different organisms. For example, in modern man the three 'ages' are relatively equal in length, about one third of the life span. In comparison, the primitive man had much shorter post reproductive period. Many animals and plants have quite long pre-reproductive period. For example, a locust in its seventeen years of life has an extremely long development history with adult life lasting only less than a year.


Related Discussions:- Age distribution - population parameters and regulation

What are coacervates, What are coacervates? Coarcervates are small stru...

What are coacervates? Coarcervates are small structures made of the aggregation of organic molecules under water solution. By electrical attraction the molecules join into bigg

Vertebrates, characterstics and classification of vertebrates

characterstics and classification of vertebrates

Food web - ecosystem, Food Web - Ecosystem A plant may serve as a food...

Food Web - Ecosystem A plant may serve as a food source for many herbivores simultaneously, e.g. grass plants can support deer, cow, grasshopper or rabbit. Similarly a herbivo

Planning the nursing care - wilms tumour, Planning the Nursing Care   ...

Planning the Nursing Care     Provide preoperative and post operative nursing care to child    Assist in therapeutic management of child.    Provide comfort.  S

How antigen react against future infection by same agent, Q. How can an org...

Q. How can an organism that once underwent contact with an antigen be immunized against future infections by the same agent? This phenomenon is called as immune memory when an

Explain the coliforms - microbiological study of water, Explain the Colifor...

Explain the Coliforms - Microbiological Study of Water? These are widely used indicators which belongs to the family Enterobacteriaceae and make up about 10% of the intestinal

Homoeostasis, what stimulate the system in homoeostasis

what stimulate the system in homoeostasis

Explain about the dehydration or drying, Explain about the Dehydration or D...

Explain about the Dehydration or Drying? The technique of drying is the oldest method of food preservation practiced by mankind. The removal of moisture, which is actually dehy

Define basic instruments used in biochemical laboratories, Basic Instrument...

Basic Instruments /Equipment Used In biochemical laboratories and important Working tips The first practical in this manual will orient you to the various equipment, apparatuses

Find final atp count in both prokaryotes and eukaryotes, Degrade a monoglyc...

Degrade a monoglyceride that has an 18-carbon fatty acid attached to it by Ester bonds. You will have to degrade the glycerol component followed by the fatty acid in presence of O2

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