Biogeography of Protected Rocky Intertidal Communities of the Northeastern Pacific
Abstract:Twelve rocky intertidal communities from Orange County, California, to Kodiak Island. Alaska, were studied using point quadrat sampling. Twenty-one hundred sample points, equally divided among high, middle and low intertidal zones, were taken in each of the localities. Organisms were identified and placed into one of four trophic categories: autotrophs, grazers, filter feeders and carnivores. Jaccard Similarity Coefficients were calculated to compare each locality to every other locality. Range data were based upon appearance of a species in the sample.
Analysis indicated that the area tested could be divided into three biogeographical entities. The dividing line between the southern and the central regions appears to be near the area of Point Conception. The dividing line between the central and northern regions appears to be near the area of Dixon Entrance. Monterey Bay does not appear to be a biogeographical dividing line.
Community structure in terms of proportion of organisms in each trophic group is similar in the three regions, except for the carnivores, which occupy a greater proportion of the organisms and taxa in the northern regions.
Document Type: Research Article
Publication date: 1983-07-01
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