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  • 1
    Electronic Resource
    Electronic Resource
    Influence of the polychlorinated biphenyl preparation Aroclor 1242® on color changes of the fiddler crab Uca pugilator (1978)
    Springer
    Marine biology 50 (1978), S. 37-45 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The melanin in the melanophores of specimens of the fiddler crab, Uca pugilator, exposed to 2, 4, and 8 ppm solutions of the polychlorinated biphenyl (PCB) preparation, Aroclor 1242®, became less dispersed than in untreated specimens. This effect was dose-dependent. It was probably due to the PCB itself and not to polychlorinated dibenzofurans which are contaminants of commercial PCBs. The decreased melanin dispersion appeared to be related to a decrease in the rate of release of melanin-dispersing hormone from eyestalk neuroendocrine cells into the hemolymph. Eyestalks of crabs kept for 4 days in Aroclor 1242 contained 4 times as much melanin-dispersing hormone as did control crabs. When injected into isolated legs, did hemolymph from control crabs. Aroclor 1242 did not appear to have a direct effect on the pigment-dispersing mechanism of the melanophores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390540
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of time of year and limb removal on rates of ecdysis of eyed and eyestalkless fiddler crabs, Uca pugilator (1976)
    Springer
    Marine biology 37 (1976), S. 357-362 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The incidence of ecdysis among monthly samples of female Uca pugilator, both intact and eyestalkless, was determined from May, 1974 through April, 1975. Among both the intact and eyestalkless crabs the percentages of the crabs that underwent ecdysis varied during the year. During the height of the breeding season in particular, ecdyses were rare among the eyestalkless crabs and absent among the intact ones. The effects of limb removal, either followed by or preceded by eyestalk removal, on the rate of ecdysis were also determined. Eyestalkless crabs from which 4 walking legs were removed either the day before or the day after their eyestalks had been removed underwent ecdysis at a slower rate than crabs lacking only eyestalks, but faster than crabs lacking only 4 walking legs. The high incidence of precocious ecdyses induced by removing large numbers of limbs from eyed crabs appears to be due to the number of limbs removed and not to the weight or volume of limb tissue removed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387491
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of the polychlorinated biphenyl preparation, Aroclor 1242, on the quantity of neurosecretory material in the medulla terminalis X-organ of the fiddler crab,Uca pugilator (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 1083-1084 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Exposure of the fiddler crab,Uca pugilator, to the PCB preparation, Aroclor 1242, produces an increase in the quantity of neurosecretory material in the medulla terminalis X-organ. This Aroclor apparently inhibits release, but not synthesis, of one or more neurohormones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949955
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    Paper (German National Licenses)
    Fulltext
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