Comparative Study of Behavioral-Sensitivity Thresholds to Near-UV and Blue-Green Light in Deep-Sea Crustaceans
The behavioral sensitivities of five species of deep-sea crustaceans (order Decapoda:Acanthephyra curtirostris, A. smithi, Notostomus gibbosus, Janicella spinacauda and Oplophorus gracilirostris) to near-UV and blue-green light were studied during a research cruise off the coast of Hawaii in 1993. Two of the five species have electrophysiologically-measured spectral sensitivity peaks at 400 and 500 nm, while the remaining three species have a single sensitivity peak at 490 to 500 nm. In the current study, behavioral mean threshold sensitivities (defined as the lowest irradiance change to which the shrimp would give a behavioral response) were determined for tethered specimens of each species at two wavelengths, 400 and 500 nm. The mean behavioral threshold sensitivities of the two species with putative dual visual-pigment systems were approximately the same to near-UV and blue-green light, while the other three species were significantly less sensitive to near-UV vs blue-green light. Results from these experiments indicate that (1) behavioral information obtained from tethered shrimp accurately reflects their spectral sensitivity, and (2) the sensitivity of the putative dichromats to near-UV light is sufficiently low to detect calculated levels of near-UV light remaining in the down-welling field at their daytime depth of 600 m. Possible functions of this high sensitivity to short wavelength light are discussed.
Tamara M. Frank and Edith A. Widder. 1994. Comparative Study of Behavioral-Sensitivity Thresholds to Near-UV and Blue-Green Light in Deep-Sea Crustaceans .Marine Biology , (2) : 229 -235. https://nsuworks.nova.edu/occ_facarticles/471.