Graduate Thesis Or Dissertation
 

Numerical classification analysis of infaunal composition and distribution on two Oregon coast beaches

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  • This investigation examined the community structure of two intertidal sedimentary environments on the Oregon coast in terms of species composition and vertical distribution. A coring device was used to obtain samples from two levels above MLLW in each beach on four occasions. Of the 54 taxa found, 46.2% were crustaceans, 35.2% polychaetes, 11.1% molluscs and 7.6% were of other phyla. The group average sorting strategy was used to produce a dendrogram after a Bray-Curtis dissimilarity matrix was made up for each survey. Two way coincidence tables were used to compare normal and inverse classifications and to determine the species which characterized each faunistic group. A basic pattern of six station groups and five to seven species groups were found in the study areas by classification analysis. Station groups were described by dominant species, frequency and mean density. Species groups were described by the dominance of constituent species restricted to site groups. The assemblages defined by numerical analysis represented the different beaches and tide levels sampled, thus at Lost Creek Eohastorius estuarius, E. brevicuspis, Dogielinotus loquax, Cirolanaharfordi, Nephtys californiensis and Euzoriu mucronata typified the upper intertidal and Archaeomysis grebnitzkii, Eteone lcna and Eohastoriu washingtonianus characterized the lower intertidal while at Yaquina Bay Eohastorius estuarius, Paraphoxus obtusiciens, LeDtocheiia dubia and Macoma sp. typified the upper level and Spio filicornLs, Mediomastus californiensis Odostomia sp., Neoarnphitrite sp., Phoronis oallida, Owenia collaris, Modiolus sp., Macoma balthica, Transenella tantilla and Clinocardium nutalli were lower level species. During all sampling periods the community inhabiting the Lost Creek beach was numerically dominated by haustoriid arnphipods with densities up to 8,908 individuals per square meter (Eohastorius brevicuspis) while at Yaquina Bay beach Leptochelia dubia, Pygospio sp. and Paraphoxus obtusidens were the dominant species with densities up to 8,738, 3,971, and 1,562 individuals per square meter respectively. With the exception of Euzonus mucronata which presented an evident patchy distribution at Lost Creek, the infauna showed a homogenous horizontal distribution at all levels at both types of environments. Temporal variation in community structure was minimal in both type of beaches during the sampling periods considered in this study.
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