. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMS IN BRAZILIAN FIDDLER CRABS 403 Differences among the species occur in the daily levels of pigment dispersion and concentration. In U. mordax the melanophores fail to concentrate fully during the first night in constant light and for the following nights, but more apparent is their failure to disperse during the day phase. For U. rapax the melanophores fail to concentrate fully but do achieve nearly the maximum of dispersion observed in natural illumination. In U. maracoani there is failure both to concentrate and to
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RHYTHMS IN BRAZILIAN FIDDLER CRABS 403 Differences among the species occur in the daily levels of pigment dispersion and concentration. In U. mordax the melanophores fail to concentrate fully during the first night in constant light and for the following nights, but more apparent is their failure to disperse during the day phase. For U. rapax the melanophores fail to concentrate fully but do achieve nearly the maximum of dispersion observed in natural illumination. In U. maracoani there is failure both to concentrate and to disperse fully. 3 LJ DC 5 5 3 UCA MORDAX UCA RAPAX UCA MARACOANI UCA THAYERI. 6AM 6PM 12 6AM 6PM 13 DEC. 62 FIGURE 2. Melanophore rhythms in natural illumination. Number of crabs used were the following: U. mordax, 22; U. rapax, 30; U. maracoani, 26; and U. thayeri, 29. Discussion The overt rhythms of pigment migration in U. mordax, U. rapax, and U. maracoani exposed to natural changes of illumination are closely adjusted to the equatorial cycle of daylight and darkness, suggesting that the rhythms serve a camouflaging and protective function. U. thayeri does not exhibit an overt rhythm of color change, but it is notable that this species is characterized by patches of pile on the dorsal surface of the carapace and appendages. Possibly. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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