Character displacement and ecological exclusion, Biology

Consider two species of organisms, species A and species B. Species A has a population in a community. Another population species B arrives into the same community, rather suddenly, being brought into the community by man (there could be other ways by which the new species can enter into a community). Let us assume that the food organisms of the two species are identical (it can be insects or seeds etc.). The range of food particle size fed upon by each individual species falls into a normal curve. By normal curve we mean that there is a variation in the given trait, for example size of the seeds or insects in this case, or beak sizes which are all distributed in such a way that the largest number of individuals in the population has optimum or mean size or measurement and a very few individuals have extreme sizes or measurments. The normal distribution as shown in Figure takes the fo!m of a bell shaped curve. You could observe from Figure that there is a significant overlap in the normal curves of food capturing devices (mouth, beak or tooth sizes) of species A and B. The region of overlap implies that the members of the two species have to compete for their food over a larger area in the community. Essentially, there is an ecological interspecific cornpetiton for food. You may also note in the figure that some food particles (food particles of both large and small sizes) are out of the reach of each species. Although the population as a whole can feed on a range of food particle size, any individual in the community is restricted in the size of the food particles it can feed on.

Assuming that the number of food particles of each size is the same, then individuals outside the region of overlap have better accessibility to the food particles and thcy may have to expend only less energy in acquiring them. Compare these individuals with those which lie within the region of overlap. They have not only to compete with conspecific individuals for their food, but with those of the other species as well. The net result is that the individuals outside the region of overlap have more energy for reproduction, and naturally will tend to leave more offsprings to thc next generation. These offsprings will essentially carry the alleles of their parents including those involved in the determination of food particle size. The effect of this natural selection.

Posted Date: 4/5/2013 6:08:32 AM | Location : United States







Related Discussions:- Character displacement and ecological exclusion, Assignment Help, Ask Question on Character displacement and ecological exclusion, Get Answer, Expert's Help, Character displacement and ecological exclusion Discussions

Write discussion on Character displacement and ecological exclusion
Your posts are moderated
Related Questions
Explain the Health Monitoring of Infant? Infections are a major cause of malnutrition in children. For many of the preventable early childhood diseases, vaccines are now avail

WHAT IS THE CLASSIFICATION OF PROTOZOA ..

The interactions between the human host and selected microorganisms that culminate in IE involve the vascular endothelium, hemostatic mechanisms, the host immune system, gross anat

Class of Mollusca - Monoplacophora Bilaterally symmetrical, with broad flat foot and single shell, mantle cavity has five to six pairs of gills; six pairs of nephridia of whi

Nitrification - Nutrient Cycles Ammonia or ammonium salts, are converted into nitrate in a process termed nitrification to be useful to most autotrophic and heterotrophic orga

Leptospirosis Leptospirosis is a general term that denotes all infections of man and animals caused by spirochaetes of the genus Leptospira. At one time, the infection had bee

Which of the following require ATP? The movement of potassium from the outside of the neuron to the inside? The movement of sodium into the neuron through a chemically gated

Define Nutritional Management of Food Allergies and Food intolerance? In this unit we will be discussing the adverse reactions associated with food. You may have read or heard

Define the Operations of a Public Nutritionist? A public nutritionist can perform the following: In the hospital-based set up, she is a part of the team delivering thera