... behaviour Colour measurement Spectrophotometry Over recent years, studies of animal colour vision have focused on the identification of physiological mechanisms, including photopigment and photoreceptor spectral sensitivities and neurons coding for opponency mechanisms, and on theoretical models...

..., at both a macroscopical and a microscopical level, by applying microscopy, spectrophotometry and imaging scatterometry. The assembled data indicate a distinct classification of the investigated species. We have come to identify five groups according to the overlapping of ground scales by cover scales...

.... † Author for correspondence. 7 9 1994 © The Company of Biologists Limited 1995 gills mitochondria crabs salinity carbonic anhydrase Na + /K + -ATPase hemolymph osmolality spectrophotometry respirometry The greater blue crab Callinectes sapidus and the lesser blue crab...