The temporal and spatial distribution of underwater quantum irradiation in a southern California kelp forest |
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| Authors: | Thomas A Dean |
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| Institution: | Marine Science Institute, University of California, Santa Barbara, California 93106, U.S.A. |
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| Abstract: | The weekly integrals of underwater photon flux density were measured for a two and a half year period in a southern California kelp forest. Photon flux densities were lowest from January to April and peaked in summer. On average, about 2% of the surface irradiation reached the bottom (depth of 13·2 m in an area without a kelp canopy). Photon flux densities under a canopy of giant kelp were reduced by 70% compared to a nearby site cleared of kelp. A significant portion of temporal variability in underwater photon flux density was explained by vertical sediment flux. Surface irradiation did not contribute significantly to the variance in weekly values of underwater irradiation. |
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| Keywords: | irradiance kelp California Coast |
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