. The biology of marine animals. Marine animals; Physiology, Comparative. 0 30 60 90 (1) 120 750 150 0 30 60 90 120 Time (minutes) (2) Fig. Chromatophore Changes in the Shrimp Palaemonetes vulgaris on Black and White Backgrounds 1. Change in diameter of a red and white pigment mass in an animal taken from a white background and placed upon a black one. 2. Change in diameter of a red and white pigment mass in an animal taken from a black background and placed upon a white one. (From Brown, 1935.) often appears outside the colour cells in a diffuse condition under certain circumstances, is
. The biology of marine animals. Marine animals; Physiology, Comparative. 0 30 60 90 (1) 120 750 150 0 30 60 90 120 Time (minutes) (2) Fig. Chromatophore Changes in the Shrimp Palaemonetes vulgaris on Black and White Backgrounds 1. Change in diameter of a red and white pigment mass in an animal taken from a white background and placed upon a black one. 2. Change in diameter of a red and white pigment mass in an animal taken from a black background and placed upon a white one. (From Brown, 1935.) often appears outside the colour cells in a diffuse condition under certain circumstances, is a carotiprotein. Species differ considerably in the number and relative amounts of chromatophore pigments which they possess, and this conditions the range of their background responses. Some marine decapods adapt themselves to a wide range of background colours. Thus, Crangon can change to conform with white, black, grey, yellow, red and orange backgrounds, and Palaemonetes can match back- grounds of black, dark grey, white, blue, green, yellow and red (Fig. ). The crabs Portunus anceps and P. ordwayi also show a considerable degree of colour adaptation to their backgrounds (Table ), whereas the fiddler crab Uca pugilator shows only weak albedo responses. It has been found, however, that Uca has a well-marked diurnal rhythm, in which it darkens during the day and blanches at night. Such an inherent rhythm is absent in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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