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Zonation of Lichens on a Rocky Seashore on Fidalgo Island, Washington

Bruce D. Ryan
The Bryologist
Vol. 91, No. 3 (Autumn, 1988), pp. 167-180
DOI: 10.2307/3243214
Stable URL: http://www.jstor.org/stable/3243214
Page Count: 14
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Zonation of Lichens on a Rocky Seashore on Fidalgo Island, Washington
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Abstract

A quantitative study of marine and maritime lichens on serpentine rock on the north shore of Washington Park, Fidalgo Island (Skagit County), Washington, revealed that major changes in the prominence values (or conspicuousness in the field) of a number of lichens and asssociated organisms occurred in the vicinity of certain elevations. This finding suggests that critical changes in environmental conditions occurred at or near these elevations. When the site was viewed as a whole, the zonation was rather indistinct, primarily because freshwater seepages modified marine-controlled zonation patterns. In addition, patchy patterns of feeding by marine snails and manuring by birds modified the zonal distributions. Upper or lower limits of certain taxa, or of conspicuous "belts" of particular taxa, were used in this study to define zone boundaries. General features of zonation at this site, in nonseepage areas, were similar in some respects to those in British studies.

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