SPECTRAL SENSITIVITY OF LARVAE FROM INTER-TIDAL CRUSTACEANS

Response spectra for positive phototaxis of the planktonic first stage larvae of 7 species of estuarine intertidal crabs were measured. Species living highest intertidally as adults generally have larvae with good ultraviolet (UV) and blue/green sensitivity, while those from adults living lower intertidally lack the UV sensitivity. Comparison of the measured spectra with previous studies of adults indicates that there is probably no change in spectral sensitivity throughout development. This sensitivity is well adapted to the adult intertidal environment, but is not adapted for a planktonic existence in estuarine areas. © 1979 Springer-Verlag.