Colonization of bare rock surfaces by microflora in a rocky intertidal habitat

Abstract

The rapid colonization by microscopic plants of natural bare rock surfaces in an intertidal habitat was investigated. The sequence of colonization (from bacteria, to diatoms to blue-green algae and spores of macroalgae) was illustrated by scanning electron micrographs. The endpoint assemblage was characterised by the blue-green alga Anacysus sp., and a number of diatoms and spores. The rapid speed of recovery to the endpoint community (within 4 wk) and the nature of the conlmunity itself differed from those described in similar habitats, possibly as a result of the grazing regime at the site studed.