English: The competitive exclusion principle states that no two species that fill a similar role in an ecosystem can occupy the same area. For example, Chthamalus and Balanus (two species of barnacle) cannot live in the same tidal zone. If only Chthamalus is present, it can grow all the way down to the low tide area (where Balanus normally is). If only Balanus is there, it can grow into the high tide area (Chthamalus’s normal territory). If both Chthamalus and Balanus are living together, Chthamalus is in the high tide and Balanus is in the low tide. Because both species occupy similar niches, they cannot live in the same area because they compete for the same resources.
I. Chthamalus and Balanus together
II. Balanus by itself
III. Chthamalus by itself
Labels:
1. Chthamalus
2. Balanus
3. Area of Competition
4. High Tide
5. Low Tide
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