5.I measure the use of nuts, trees and nesting
materials by two species of squirrel and find some strong overlaps in the uses
of nesting materials in particular. Is
it safe to conclude that these two species are competitors? Why or why not?
When one species has even the slightest advantage or edge over another
then the one with the advantage will dominate in the long term. One of
the two competitors will always overcome the other, leading to either
the extinction of this competitor or an evolutionary or behavioral shift toward a different ecologicBased on field observations, Joseph Grinnell
formulated the principle of competitive exclusion in 1904: "Two species
of approximately the same food habits are not likely to remain long
evenly balanced in numbers in the same region. One will crowd out the
other". Russian ecologist Georgy Gause formulated the law of competitive exclusion based on laboratory competition experiments using two species of Paramecium, P. aurelia and P. caudatum. The conditions were to add fresh water every day and input a constant flow of food. Although P. caudatum initially dominated, P. aurelia recovered and subsequently drove P. caudatum extinct via exploitative resource competition. However, Gause was able to let the P. caudatum survive by differing the environmental parameters (food, water).al niche. The principle has been paraphrased into the maxim "complete competitors cannot coexist
Apr 21st, 2015
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