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Spatial and Seasonal Distribution of Littoral Diatoms in Yaquina Estuary, Oregon (USA)

Distributional patterns of littoral diatoms in Yaquina Estuary, Oregon (U.S.A.) were related to selected environmental variables. Seven stations located between marine and fresh water were sampled during May and August 1969 at four levels in the intertidal region. Mean species diversity was lowest at marine and fresh-water stations subjected to prolonged periods of desiccation. The most abundant taxa were Melosira moniliformis, Navicula mutica, Synedra fasciculata, and Navicula no. 2, a Schizonema-type Navicula. Of these, Navicula mutica had the nairowest distribution relative to our pattern of sampling. Multiple correlation of a Community difference measure (Dhk) with selected physical variables indicated that mean salinity accounted for most of the variability between samples. Matrices of Dhk values comparing stations along the salinity gradient supported the concept of a distributional continuum in the estuary with a pronounced discontinuity in the diatom flora at locations where the salinity fluctuates around a mean of 5 °/00. The distributions ofAchnanthes specie^Amphipleura ruf Hans, Fragilaria striatula v. califomica, Licmophora gracilis, Melosira moniliformis, M. nummuloides, Navicula iserta, N. mutica, N. viridula v. avenacea, N. n o. 2, Nitzschia frustulum v. perpusilla, and Synedra fasciculata are discussed in detail.