Factors that limit the reproductive potential, Biology

Organisms are made to compete for their needs from the environment. The competition as we pointed earlier could be for the food and territory, to overcome the adverse climatic conditions, to escape from predators or tp combat an infectious diskase. This is indeed the "struggle" It is this "struggb" that keeps the population numbers under manageable levels and from increasing on a logrithmic scale. We earlier referred to the reproductive potential of frogs. If the potential is fully realised, then in a short time, they would be placing a severe strain on the resources on which they depend and soon all of them would starve. However, this is not the case. Most of the population sizes do not increase enormously but they only fluctuate to asmall extent from time to time. Some other populations'however, do increase aramatically in certain seasons and decrease even more dramatically in certain other seasons. In laboratory one can grow cell cultures in which any one of the resources such as food, space etc. is limited. Under these circumstan~es the population growth rate of the cells which is exponential to begin with decreases and levels off: The resulting sigmoidcurve is characteristic of biological growth in general. (Fig. 11.1) The factors that we n. mentioned earlier are the ones which delimit the numbers or size to the carrying capacity of the environment in natural populations. For instance, the 'carrying capacity of the environment for plants is controlled by the ambunt of spact! required 'by the individuals of their own and other species. No new seeds or shoots can develop in that particular area until the older plants fall. Population sizes in animals, as mdntioned earlier can be limited by food supply. Here the number of individuals ,increases until the food shortage occurs. Such a shortage of resources would decrease,the reproduction.

Posted Date: 4/6/2013 1:02:43 AM | Location : United States







Related Discussions:- Factors that limit the reproductive potential, Assignment Help, Ask Question on Factors that limit the reproductive potential, Get Answer, Expert's Help, Factors that limit the reproductive potential Discussions

Write discussion on Factors that limit the reproductive potential
Your posts are moderated
Related Questions
Explain the Evolution of the Vascular Plant Body? Vascular Plant anatomy reflects adaptation to life on land. In an aquatic environment, the photosynthetic surfaces are support

Explain about the Cancer and Infertility - Obesity? Cancer: Risk of cancers of the colon, rectum and prostrate increases greatly in obese men while obese women are more likely

DNA TRANSLATION AND TRANSCRIPTION

Segmentation - Metazoa Segmentation or metamerism is the division of the body into smaller transverse compartments along the anterior-posterior axis. Segmentation is widesprea

Explain Nutritional assessment and Guidance in Prenatal Care? In the preceding sections, we have seen that there are unique physiologic changes in the pregnant woman's body, wh

Pituitary The pituitary is also known as hypophysis. It is composed of two embryologically distinct tissue. The anterior pituitary or adenohypophysis is derived from the roof

Explain the Metabolism - Zinc? Zinc has been found to play an important biological role in our body. Zinc ions can be chelated and precipitated by a number of chelating agents

Membrane is any delicate sheet that divides one region from other blocking or permitting (selectively or completely) the passage of substances. The skin, for example, can be consid

Blastula is the ball of cells surrounding a fluid-filled cavity (known as blastocoel) which is produced by the cleavage of a zygote.

List er i o si s The disease is caused by Listeria monocytogenes - Gram positive small non spore- forming bacilli seen in soil, silage, sewage and feces of animals and b