Essay Topics
Types of Essays
Essay Checklist
Word Counter
Readability Score
Essay Rewriter
Though two popula-tions cannot coexist in a given habitat with precisely the same niche, it is highly probable that the niches of different populations will show varying degrees of overlap. This occurs when two organi-sms use the same resource, such as food. Thus the concept of the niche is clo-sely associated with the concept of competitive exclusion and competitive relationships among spices (see chapter 16). Basically, Gause Principle or competitive exclusion theory states that no two species persist in the same niche. Either one becomes extinct, through natural selection; diverge into different niches. The latter phenomenon is called niche separation. Consider, for example, two species of plants that are able to grow in saline water, as in salt marsh. Species A can grow successfully if the salt content of the soil solution is 0 2 per cent; and species B car grow success-fully if the salinity of the soil solution is 1 -3 per cent. Individuals from both populations which are physiologically best adapted to sur-vive under salinities of 1 2 percent lie in the area of overlap and are in direct competition with one another. Those individuals of species A that favor a salinity lower than 1 per cent and those individuals of species B favoring a salinity greater than 2 per cent lie in the areas of non-overlap and are not in inter-specific com-petition. As a general rule, individuals from populations with overlapping niches but which themselves lie outside the area of overlap are likely to show greater survivorship and reproductive success, because they are not competing with individuals from the other species. Thus natural selection tends to favor these indivi-duals, and the non-overlapping portions of the population's niche will tend to increase in relation to the overlapping portion. The reduction in the area of overlap is equivalent to separation of the niches. The amount of niche overlap is usually proportional to the degree of competition for that resource (Note, competition involves only a resource that is in short supply). In extreme cases niches may be adjacent to one another with no overlap. In another extreme case the fundamental niche of one may be completely within the fundamental niche of another, as in the case of seedling Rumex and grass. In such instances the Rumex seedling is competitively su-perior. In most cases, however, fundamental niches may partially overlap. Some niche space is shared and some is exclusive, ena-bling the organisms to coexist. For example, in Natal (Africa), two species of rhinoceros, the black and white live in the same area but have different food niches. The black rhinoceros is a browser, feeding woody plants, while white rhinoceros is grazer, eating herbs and Grasse: so that they are not in competition for the same food resource.
Essay Writing Checklist
The following guidelines are designed to give students a checklist to use, whether they are revising individually or as part of a peer review team.
Introduction
  • Is the main idea (i.e., the writer's opinion of the story title) stated clearly?
  • Is the introductory paragraph interesting? Does it make the reader want to keep on reading?
Body Paragraph
  • Does each body paragraph have a clear topic sentence that is related to the main idea of the essay?
  • Does each body paragraph include specific information from the text(including quoted evidence from the text, if required by the instructor)that supports the topic sentence?
  • Is there a clear plan for the order of the body paragraphs (i.e., order of importance, chronology in the story, etc.)?
  • Does each body paragraph transition smoothly to the next?
Conclusion
  • Is the main idea of the essay restated in different words?
  • Are the supporting ideas summarized succinctly and clearly?
  • Is the concluding paragraph interesting? Does it leave an impression on the reader?
Overall Essay
  • Is any important material left unsaid?
  • Is any material repetitious and unnecessary?
  • Has the writer tried to incorporate "voice" in the essay so that it has his/her distinctive mark?
  • Are there changes needed in word choice, sentence length and structure, etc.?
  • Are the quotations (if required) properly cited?
  • Has the essay been proofread for spelling, punctuation, grammar, etc.?
  • Does the essay have an interesting and appropriate title?
Overlapping Niches and Niche Separation
Trending Essay Topics
Explore today's trending essay topics:
Reference
Feel free to use content on this page for your website, blog or paper we only ask that you reference content back to us. Use the following code to link this page:
Terms · Privacy · Contact
Essay Topics © 2019

Overlapping Niches And Niche Separation

Words: 450    Pages: 2    Paragraphs: 9    Sentences: 22    Read Time: 01:38
Highlight Text to add correction. Use an editor to spell check essay.
              Though two popula-tions cannot coexist in a given habitat with precisely the same niche, it is highly probable that the niches of different populations will show varying degrees of overlap.
             
              This occurs when two organi-sms use the same resource, such as food. Thus the concept of the niche is clo-sely associated with the concept of competitive exclusion and competitive relationships among spices (see chapter 16).
             
              Basically, Gause Principle or competitive exclusion theory states that no two species persist in the same niche. Either one becomes extinct, through natural selection; diverge into different niches. The latter phenomenon is called niche separation. Consider, for example, two species of plants that are able to grow in saline water, as in salt marsh.
             
              Species A can grow successfully if the salt content of the soil solution is 0 2 per cent; and species B car grow success-fully if the salinity of the soil solution is 1 -3 per cent. Individuals from both populations which are physiologically best adapted to sur-vive under salinities of 1 2 percent lie in the area of overlap and are in direct competition with one another.
             
              Those individuals of species A that favor a salinity lower than 1 per cent and those individuals of species B favoring a salinity greater than 2 per cent lie in the areas of non-overlap and are not in inter-specific com-petition. As a general rule, individuals from populations with overlapping niches but which themselves lie outside the area of overlap are likely to show greater survivorship and reproductive success, because they are not competing with individuals from the other species.
             
              Thus natural selection tends to favor these indivi-duals, and the non-overlapping portions of the population's niche will tend to increase in relation to the overlapping portion. The reduction in the area of overlap is equivalent to separation of the niches.
             
              The amount of niche overlap is usually proportional to the degree of competition for that resource (Note, competition involves only a resource that is in short supply). In extreme cases niches may be adjacent to one another with no overlap. In another extreme case the fundamental niche of one may be completely within the fundamental niche of another, as in the case of seedling Rumex and grass.
             
              In such instances the Rumex seedling is competitively su-perior. In most cases, however, fundamental niches may partially overlap. Some niche space is shared and some is exclusive, ena-bling the organisms to coexist.
             
              For example, in Natal (Africa), two species of rhinoceros, the black and white live in the same area but have different food niches. The black rhinoceros is a browser, feeding woody plants, while white rhinoceros is grazer, eating herbs and Grasse: so that they are not in competition for the same food resource.
Biology Essay Science Essay 
Tip: Use our Essay Rewriter to rewrite this essay and remove plagiarism.
Next Science Essay: Short Essay On Tundra Bioma
Next Biology Essay: Predation : Components & Effects

Add Notes

Have suggestions, comments or ideas? Please share below. Don't forget to tag a friend or classmate.
clear
Formatting Help
Submit
SitemapOnepunch-Man 14 | The Warrior Elite: The Forging of SEAL Class 228 | Unité 9