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Uca pugilator
About: Uca pugilator is a research topic. Over the lifetime, 376 publications have been published within this topic receiving 12303 citations.
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9 citations
TL;DR: In this article, the radiation sensitivities of five estuarine decapod crustacea were compared: three species of fiddler crabs,Uca pugilator, U. pugnax, and U. minax: the blue crab, Callinectes sapidus, and grass shrimp,Palaemonetes pugio.
Abstract: The radiation sensitivities of five estuarine decapod crustacea were compared: three species of fiddler crabs,Uca pugilator, U. pugnax, U. minax: the blue crab,Callinectes sapidus, and the grass shrimp,Palaemonetes pugio. Temperature and salinity (20 C and 30 o/oo) and radiation dose rate (310 rad/min) were the same for all species. The 40-day LD-50 values for the fiddler crabs (U. pugilator, 9,800 rad;U. pugnax, 16,500 rad; andU. minax, 13,500 rad) fell between those of the blue crab, 42,000 rad, and grass shrimp, 215 rad. Possible physiological and ecological explanations for the differences in sensitivity are discussed.
9 citations
TL;DR: Physicochemical factors operating in the in vitro excystment of the two microphallids are correlated with conditions presumed to prevail in the avian gut.
Abstract: A high rate and percentage of excystment of Probolocoryphe uca metacercariae occur at 40 °C in a low salt medium, in the absence of exogenous enzymes, indicating a largely active form of excystment. Exogenous trypsin is required for excystment of Gynaecotyla adunca metacercariae and it is presumed that excystment is largely a passive process. Saturated CO2 conditions promote excystment in this species, whereas high concentrations of pepsin, bile salts (especially deoxycholate), and extreme pH conditions have adverse effects on the process. Physicochemical factors operating in the in vitro excystment of the two microphallids are correlated with conditions presumed to prevail in the avian gut. Excysted metacercariae of both species begin egg production in vitro within several days. Such rapid development may be related to diverse definitive host capacities.
9 citations
TL;DR: After autotomized fiddler crabs were placed in magnetic fields produced by ceramic plate magnets in such a way that some crabs were in proximity to the N pole, and others to the S pole, regeneration of juvenile crabs, and of adult crabs during the summer months, was not significantly affected by the magnetic fields.
Abstract: After autotomy, fiddler crabs ( Uca pugilator and U. pugnax) were placed in magnetic fields (in the 100 Oersted range) produced by ceramic plate magnets in such a way that some crabs were in proximity to the N pole, and others to the S pole. Control crabs were several feet away from the magnets. Regardless of the number of limbs autotomized, direction of the field, species, or salinity of the water, crabs in proximity to the S pole regenerated and molted sooner than con trols, and those by the N pole were delayed in relation to controls. Factors such as magnetic effects on enzymatic reactions and ionic flux, orientation of animals within the magnetic field, and production of electric currents in the limb stumps may be involved in these effects. The opposite responses to N and S poles may be due to the opposite direction of the gradient vector. Regeneration of juvenile crabs, and of adult crabs during the summer months, was not significantly affected by the magnetic fields.
9 citations
9 citations