By Richard Mariscal (Eds.)
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Example text
G r o w t h , egg production, and survival were affected in certain seasons by the presence of another species. Sometimes one species will interfere with another, even though they may not be competing for a scarce resource. F o r example, the starfish Pisaster giganteus climbs u p pier pilings to feed on mussels in the intertidal region. Landenberger (1967) found that there were fewer starfish on the mussel clumps if the lower part of the piling had large populations of the anemone, Corynactis.
Effects of excluding small limpets (Acmaea digitalis and A. scabra) with stainless-steel mesh fences at high shore levels in central California. T h e p h o t o g r a p h shows t h e growth of algae after 4 m o n t h s in t h e a u t u m n of 1964. F r o m left to right: no limpets, A. digitalis removed, A. scabra removed, unaltered control. Pale squares are sites from which algae were removed for analysis ( H a v e n , 1973). sublittoral rocks; the algae grew quickly and the species composition changed.
Thus the effect of wave action in tearing mussels off the shore varies with the proportion of the two species present. In addition to the single-species populations of Littorina described earlier, Behrens (1971) also set up populations of two species in cages on the shore. G r o w t h , egg production, and survival were affected in certain seasons by the presence of another species. Sometimes one species will interfere with another, even though they may not be competing for a scarce resource. F o r example, the starfish Pisaster giganteus climbs u p pier pilings to feed on mussels in the intertidal region.
