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20. ABSTRACT (Concluded). 
The results documented that both jetties were rapidly colonized by sessile and 
motile biota. Within 1 year after construction, faunal and floral coverage 
of the rocks was equivalent to subsequent sampling periods, as were estimates 
of species diversity and abundance. Distinct vertical zonation of sessile 
biota was also observed within 1 year, with distribution patterns generally 
remaining similar throughout the study period. Vertical gradients in the 
distribution of motile fauna were less apparent, although some differences 
were noted intertidally versus subtidally. Community composition, on the 
other hand, changed both seasonally and yearly. Community structure appeared 
to change less over time in intertidal areas than in subtidal areas, where 
marked changes in dominant sessile taxa were observed between sampling periods. 
No stable or "climax" jetty community was apparent subtidally after 3 to 4 
years, and other studies suggest that such a community is not likely to occur. 
Fish found around the jetties were abundant and included several recrea- 
tionally important species. Stomach content analysis indicated that the jetty 
biota was an important food resource for several fishes. In addition, at 
least one species, black sea bass, was using the rocks as a nursery area. 
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