Abstract
IN the University of California Publications in Zoology (vol. ix., No. 6), Mr. C. O. Esterly discusses the vertical distribution of certain Copepoda as shown by a large number of hauls made in the region of San Diego, between the years 1905 and 1911 Dividing the twenty-four hours into a “day” period from 6 a.m. to 6 p.m., and a “night” period of the remainder, the author finds in the results obtained a distinct night migration towards the surface, with a corresponding downward movement during the day. For nine out of ten species specially considered the time of this maximum occurrence at the surface is found to vary between 6–8 p.m. and 10–12 p.m., Calanus finmarchicus attaining its maximum in the latter period. The depth shown for the day plurimum is more obscure, ranging between 50 and 200 fathoms.
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C., L. Plankton Distribution 1 . Nature 92, 241–242 (1913). https://doi.org/10.1038/092241a0
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DOI: https://doi.org/10.1038/092241a0