(full paper is archived in the Miller Library)
Title: Endogenous rhythmicity of vertical migration in a meiofaunal population of the intertidal collembolan Archistoma besselsi (Arthropoda: Insecta)
Student Author(s): Fritts, Ellen I
Faculty Advisor(s): Burnett, Robin
Location: Final Papers Biology 175H
Date: June 1978
Keywords: biological rhythms in marine and maritime organisms
Abstract: In a meiofaunal population of the intertidal collembolid Archisotoma besselsi found on a pocket beach at Mussel Point, California: (a) An endogenous rhythm of vertical migration was demonstrated and a predictive model of location in the sand versus tidal condition was developed. (b) Tidal patterms with diel influences were implicated as major components of this endogenous rhythm. (c) Gross patchiness was exhibited by the population and was attributed in part to characteristics of the sand column. (d) The majority of the population was localized at approximately +4 feet above MLLW and was found to remain at varying depth within the sand even when completely inundated by the tides. (e) Exposure to approximately forty-nine hours of a 3-hours delayed tidal regime was insufficient to change expected trends in the migration pattern. (f) Suggestion was made that simultaneous occurrence of dawn and high tide temporarily destabilizes expected activity rhythms.