Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The occurrence and distribution of diatoms (Cocconeis sp.) epizooic on Tigriopus californicus in high tidepools
Student Author(s): Moths, Lisa
Faculty Advisor(s): Abbott, I. A.
Pages: 16
Location: Final Papers Biology 175H
Date: June 1977
Keywords: high tide pools
Abstract: There is an extensive association between the epizooic diatom Cocconeis sp. and the copepod Tigriopus californicus. Incidence and frequency of Cocconeis in a tidepool may be a function of the amount of disturbance that pool experiences. From this study, it seems that more stable pools will have a higher incidence and broader frequency distribution of Cocconeis than will pools which are frequently disturbed. More stable pools may provide a better growth environment for the diatoms. Cocconeis are distributed evenly between male and female copepods and along the segments of the body. The diatoms are not selected as a food source but are digested when exoskeletons bearing them are consumed. Diatoms did not affect the brood size of the females they were living on. Further work on the copepods' response to stress with and without diatoms would be useful in elucidating the nature of the relationship between T. californicus and Cocconeis.