http://www2.warwick.ac.uk/study/cll/open_courses/certs-1314/ecology/students/autumn-term/week-5/Bilateral Graphs are created to show the overlap or intersection of two corresponding variables. The Janzen-Connell hypothesis describes the relationship between seed distribution and seed survival. As you can see from the graph as distance increases from parent tree the probability of seed distribution decreases but chances of seed and seedling survival increases. The two variables intersect at a certain distance which is the optimal area for the distribution of seeds with the highest chance or survival. This diagram is used in biogeography to illustrate why tropical forests are so diverse. In the tropical forests there are a lot of seed predators so parent trees are required to distribute their seeds further to help ensure survival. This is a check and balance relationship that creates great species diversity in the tropical forests. Bilateral graphs, such as this one can be very beneficial in comparing the relationship of two related variables.
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