show Abstracthide AbstractWe assessed genome-wide temporal transcript expression patterns in the sea anemone, Nematostella vectensis, in Great Sippewissett Marsh in Massachusetts, where anemones experienced a natural light cycle with intensity varying from 0-200 lum/ft2, daily temperature fluctuations of ~9C. We measured 'in situ' gene expression from recaptured anemones every hour from 0800 to 1700 and identified six time-dependent gene clusters, represented by several genes involved in metabolism, stress, and transcription-translation related functions. Overall design: We measured gene expression from anemones every hour from 0800 to 1700 for a total of 10 time points in both single individuals and pooled samples