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Q.

Which of the following best represents the interaction between Balanus and Chthamalus in the intertidal regions on the rocky seacoasts of Scotland?

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a

– , 0

b

– , –

c

+ , 0

d

+ , + 

answer is B.

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Detailed Solution

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Balanus and Chthamalus are two species of barnacles that need to attach themselves to the rocky surface to survive and grow. However, Balanus occupies the more favourable attachment points and leaves the less favourable ones for Chthamalus. This is an example of competition for a limited resource (in this case, space), which can have detrimental effect (–) on both the competing species.
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