Species diversity-structure of community, Biology

Assignment Help:

Species diversity

An important attribute of a community is its species diversity. The diversity is calculated both by the number of species (richness) and the relative abundance of each species (evenness). The greater the number of species and more even their distribution the greater is the species diversity.

It is important to realise that species diversity and dominance are interrelated. Communities with one or a few dominant species are characterised by low species diversity whereas communities where no single species is truly dominant and individuals are equally distributed among all species. are charactensed by high species diversity.

Diversity is also related to the stability of the community. A stable community is one which is able to return to its original condition after being disturbed in some way. Communities with high species diversity are comparatively more stable because many alternative pathways exist in such communities to enable the individuals to obtain the required energy and nutrients. To put it differently, the presence of a large number of species would mean that if one species disappears or declines, its function and place can be assumed at least in part by another. It is now however, increasingly realised that in some situations greater diversity does not necessarily result in greater stability. Stability is more dependent on the number of well adapted species than on the total number of species present.

Communities created by man such as lawns, or agricultural fields are very unstable and require great deal of constant manipulation and maintenance.


Related Discussions:- Species diversity-structure of community

Fragmentation - types of asexual reproduction, Fragmentation - Types of Ase...

Fragmentation - Types of Asexual Reproduction Fragmentation is a phenomenon where parent animal spontaneously (on its own accord) splits into two or more fragments. Each one o

An experiment to test the hypothesis, How would you design, in principle, a...

How would you design, in principle, an experiment to test the hypothesis that a certain variety of lettuce seed needed daylight in order to germinate?  You would need as large

Define methods of estimation of ascorbic acid (vitamin c), Define Methods o...

Define Methods of Estimation of Ascorbic Acid (Vitamin C)? Ascorbic acid is also known as vitamin C which is a water soluble vitamin. As you already know, vitamins are a group

Is fecundation in mammals internal or external, Is fecundation in mammals i...

Is fecundation in mammals internal or external? Fecundation in mammals is internal, with copulation. In the contemporary world human technology is able to endorse artificial e

Gastro epiploic artery ge-other arterial conduits, Gastro Epiploic Arte...

Gastro Epiploic Artery (GE) :  Gastro epiploic artery is a less popular arterial conduit now. The midline chest incision is extended to the umbilicus and the right ga

Myocardial contractility, Inspiration decreases the pressure in the central...

Inspiration decreases the pressure in the central veins and thus increases the pressure gradient between the peripheral and central veins thus augmenting venous return. Skeletal mu

Spermatogonia, Spermatogonia Spermatogonia are the youngest germ cells...

Spermatogonia Spermatogonia are the youngest germ cells from which spermatozoa proliferate. These lie next to the basement membrane and undergo series of mitotic divisions lea

Do the membranes form only the outer wrapping of cells, Q. Do the membranes...

Q. Do the membranes form only the outer wrapping of cells? Lipid membranes do not form only the outer cover of cells. Cell organelles, such as the Golgi complex, lysosomes, chl

Define thin layer chromatography, Define Thin Layer Chromatography? Thi...

Define Thin Layer Chromatography? This is an improvement over paper chromatography and uses thin layers of slurried absorbents like silica gel, alumina, cellulose, Kieselguhr,

Disorders of thyroid function, Disorders of Thyroid Function: The diso...

Disorders of Thyroid Function: The disorders of thyroid function may  lead to following problems:  Juvenile Hypothyroidism Hypothyroidism is one of the most common end

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