Question

Why is the barNaCle Chthamalus found only in the upper regions of the intertidal zone?

1) It cannot live at the bottom of the zone where oxygen levels are low.
2) Interference competition from another barNaCle, Semibalamus, prevents adults from persisting at the bottom of the zone.
3) Exploitative competition from another barNaCle, Semibalamus, prevents adults from persisting at the bottom of the zone.
4) Its larvae are able to survive only in the upper intertidal zone

Answer 1

The barnacle Chthamalus is found only in the upper intertidal zone due to interference competition from another barnacle, Semibalamus, which dominates the lower areas.

Step-by-step explanation:

The barNaCle Chthamalus is typically found only in the upper regions of the intertidal zone. This is due to interference competition from another barNaCle, Semibalamus, which prevents adults of Chthamalus from persisting at the bottom of the zone. While Chthamalus can attach itself and survive in the upper areas, Semibalamus, which is better adapted to the harsher conditions lower in the intertidal zone, excludes it through direct competition over space and resources.