VARIATIONS IN TEMPERATURE AND LIGHT RESPONSE WITHIN A PLANKTON POPULATION

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Abstract
From a series of plankton hauls made over a range of depths in the Florida current, and under widely different hydrographic conditions, a study was made of the changes in noon level of the zooplankton in relation to vertical movements of isotherms and isolumes. It was shown that there was a close correlation, but that there was also a steady change downwards through the plankton column. At the top the light exercises predominant control; at the bottom, temperature control is greater. The two groups studied, chaetognathes and siphonophores, yielded very similar results. It is probable that a pressure response must also be considered.

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