Lined Up…to Eat?

Sucia’s shorefront–with its hardened pattern of a seafloor long ago–maintains a miniature mountain range notably barren on the seaward side… and just as remarkably resplendent with life of the other!  

Lines of barren sedementary rock on one side... life of the other

Lines of barren sedementary rock on one side... life of the other

I imagine acorn barnacle veligers (Belanus sp.?) peering over a chain of microcosmic peaks at the crash, pound and scour of living surf on the other side and then contentedly sliding back down the other side to permanently cement themselves to tranquility. 

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Strange, then, that these colonies do not seem to me as large, fat and happy as they might be.  Elder barnacles that have lived good long lives (as indicated by their size) seem to be nowhere to be found on this shore. 

Is that an indication of a size limitation for this species?
Or is there a ravenous army of snails to blame?  

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~brit

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