Title

UV Light in the Deep‐Sea: In Situ Measurements of Downwelling Irradiance in Relation to the Visual Threshold Sensitivity of UV‐Sensitive Crustaceans

Document Type

Article

Publication Date

1996

Publication Title

Marine and Freshwater Behaviour and Physiology

Keywords

Deep‐sea, UV‐light, Crustaceans

ISSN

1023-6244

Volume

27

Issue/No.

2-3

First Page

189

Last Page

197

Abstract

Several species of deep‐sea crustaceans possess unusually high spectral sensitivity to UV light, measured electrophysiologically. In addition, behavioral experiments indicate that these species are equally sensitive to near‐UV and blue‐green light. These results raised questions about the functional significance of this short wavelength sensitivity, since it is commonly believed that UV light is virtually absent in the deep‐sea. Using submersible based technology, we conducted measurements of downwelling irradiance at two wavelengths ‐ 380 and 480 nm. These measurements indicate that the irradiance of 380 nm light at 500–600 m, the daytime depth range of the crustaceans with a U V sensitivity peak, is high enough to be detected by these species. In addition, measurements of the spectrum of the downwelling light field conducted at dusk demonstrate that spectral changes visible at the surface are not visible at 150 m. These results are discussed with respect to hypotheses on the functional significance of UV vision in deep‐sea crustaceans.

Comments

©Informa Group plc

DOI

10.1080/10236249609378964

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Peer Reviewed

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