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
These circular orifices are located at the upper ends of the outflow parts of the left and right ventricles respectively. The pulmonary orifice which is 3 cms, is 0.5 cm larger tha

how is an increase in glucose concentration controlled in the human body?

Vital Signs of clinical evaluation Patient's clinical evaluation starts with the examination of certain vital signs which are: B.P. (Take average of two regarding with atlea

Q. Precautions should be taken while exercising? Being a diabetic the patient has to take a few precautions. These are: - Initiate the exercise programme gently and then bui

After the virus capsid containing vimentin gets into the nucleus it is broken down and the DNA is released. Whether capsid proteins are broken down into amino acids or remain intac

Biotechnology: Biotechnology is, perhaps. best defined as the  industrial utilisation  of biological  systems or processes.  In sense, therefore, biote(biology ha existed fo

Precautions It is a common observation that BP recordings are variable when taken by different individuals. To decrease this variability it is important that certain precautio

Neurochemistry of Attention Different neurotransmitters systems are implicated in attention. Cholinergic, dopaminergic and serotonergic systems play major roles in neurochemica

Describe in brief about the Boron  - Micronutrients  Boron is required in extremely small amounts in the range of 0.01 to 1.0 ppm. The actual amount may vary from crop to crop