Intertidal Barnacles

Barnacles
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Intertidal barnacles have to be very picky about where they set up shop at the end of their free floating stage. If they settle too high on a pier, they die. If they settle too low, they may not have the best access to food, be easily out competed and die. The elevation that the barnacles flourish is so specific in relation to the tidal cycle, that their position can be used to determine tidal elevations.
Trudie` Bell
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