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The distribution of  Codium fragile  subsp.  fragile  and the native canopy-forming alga  Fucus  serratus  was recorded at 51 sites in a 20 km long, sheltered region on the southwest coast of Norway. The purpose of the study was to examine if these species are potentially competing and how their distributions are related to wave-exposure and substrate.  Codium fragile  subsp.  fragile  was patchily distributed, a pattern which appears to have been sustained over time since its introduction to this area. It was almost always observed growing below mean low water, in the low intertidal and shallow subtidal. Both substrate type and wave-exposure influenced the vertical distribution of  C. fragile  subsp.  fragile ; growth occurred higher on the shore at sheltered sites and deeper in the subtidal on stony substrate. Its vertical range of growth overlapped with that of  F. serratus  and, when  C. fragile  subsp.  fragile  was abundant,  F. serratus  tended to grow higher on the shore and at lower abundances. This suggests that  C. fragile  subsp . fragile  is affecting  F. serratus  in this area through competition, but only in the lower portion of the fucoid’s vertical range and only at sites favorable for its own growth with regard to shelter and substrate.

botanica marina

Correlative evidence for competition between  Fucus serratus  and the introduced chlorophyte  Codium fragile  subsp.  fragile  on the southwest coast of Norway