Showing papers on "Uca pugilator published in 1986"
TL;DR: It was established that ecdysone, 20-hydroxyecdysone and RIA-active metabolites are present in the hemolymph at the end of anecdysis and throughout proecdysis and there was little correlation between in vitro secretory activity and total ecDysone in circulation.
46 citations
TL;DR: In intact fiddler crabs, Uca pugilator, norepinephrine (NE) produced light adaptation of the distal retinal pigment whereas dopamine (DA) produced dark adaptation of this pigment.
39 citations
TL;DR: The characterized Cancer PDH is structurally identical to an octadecapeptidePDH of Uca pugilator, but differs from the PDH of Pandalus borealis at positions 3, 4, 11, 13, 16, and 17.
Abstract: The application of separation procedures, including liquid partition, gel filtration, ion-exchange chromatography, partition chromatography, and reversed-phase high-performance liquid chromatography, enabled the purification of an octadecapeptide pigment-dispersing hormone (PDH) from powdered lyophilized eyestalks ofthe crab, Cancer magister. Automated Edman degradation, followed by the identification of carboxyl-terminal amide, established the sequence of the peptide as: Asn-Ser-Glu-Leu-Ile-Asn-Ser-Ile-Leu-Gly-Leu-Pro-Lys-Val-Met-Asn-Asp-Ala-NH2. The characterized Cancer PDH is structurally identical to an octadecapeptide PDH of Uca pugilator, but differs from the PDH of Pandalus borealis at positions 3, 4, 11, 13, 16, and 17.
35 citations
TL;DR: The authors tested Uca pugilator, an inhabitant of relatively dry and sandy areas, and U. minax, which inhabits wetter and muddier substrates, to determine if species differ in PCB uptake and depuration rates.
Abstract: The primary objective of this research was to characterize rates of PCB uptake and depuration by fiddler crabs in a simulated spoil bank habitat that contained PCBs in weathered sediment. Also, the authors examined whether the concentration of PCBs in substrates affected bioaccumulation by mixing PCB-laden sediments with clean sand. In a pilot study, they tested Uca pugilator, an inhabitant of relatively dry and sandy areas, and U. minax, which inhabits wetter and muddier substrates, to determine if species differ in PCB uptake and depuration rates.
15 citations
TL;DR: The first walking leg behind the major chela of male fiddler crabs, Uca pugilator, has characteristic fields of tubercles on the anterior distal face of the merus and on the carpus, an example of differences between a regenerated appendage and an original appendage, and of morphological changes caused by toxicant exposure.
Abstract: The first walking leg behind the major chela of male fiddler crabs, Uca pugilator, has characteristic fields of tubercles on the anterior distal face of the merus and on the carpus. In a population of crabs from Southampton, New York, the average number of meral tubercles was 28.7 ± 1.37. However, the number dropped to 10.1 ± 0.86 in limbs that had regenerated in clean sea water and was even lower in limbs that regenerated in mercuric chloride (6.9 ± 1.15), cadmium chloride (4.7 ± 1.3), and methylmercury (4.4 ± 0.51). These results provide an example of differences between a regenerated appendage and an original appendage, and of morphological changes caused by toxicant exposure.
13 citations
TL;DR: Asymmetries in thoracic and leg muscles that move the single huge major cheliped of male fiddler crabs are compared to their contralateral homologues in nine species of Uca.
Abstract: Asymmetries in thoracic and leg muscles that move the single huge major cheliped of male fiddler crabs are compared to their contralateral homologues in nine species of Uca. In Minuca (U. longisignalis, U. minax, U. pugnax, and U. rapax) and Boboruca (U. thayeri) species, the major side body muscles are twice as large as the minor muscles, with more muscle fibers. Additionally, the individual sarcomeres are exceptionally long, reaching over 20 µm in length. In contrast, in species of the sub-genus Celuca (U. crenulata, U. panacea, U. pugilator, and U. speciosa), while these muscles may be up to six times larger than their contralateral homologues, with fibers nearly twice as long, the sarcomeres are not so hypertrophied.Major muscles in the chela can be 20 times larger than their contralateral homologues. The largest chela muscles also show exceptionally large sarcomeres among Minuca, but not in Celuca.It is shown that sarcomere lengths are inversely correlated with the speed and duration of the courtship...
12 citations
6 citations
TL;DR: Extracts of the brain and nerve cord of the leech that were injected into intact fiddler crabs, Uca pugilator, produced dispersion of the pigment in the erythrophores of these crabs, but did not cause the pigmentIn their melanophores to disperse.
4 citations
TL;DR: Reserpine produced alterations in neurosecretory cell types I and II in the eyestalk, brain, and thoracic ganglion, most notably a decrease in the amount of stored neuro secretory material.
Abstract: 1. 1. Reserpine produced alterations in neurosecretory cell types I and II in the eyestalk, brain, and thoracic ganglion, most notably a decrease in the amount of stored neurosecretory material. 2. 2. The ovarian index decreased, but the oocyte area increased in the reserpinized crabs. 3. 3. Chlorpromazine did not produce any significant changes in the structure of cell types I and II. In spite of having a normal area, the oocytes in the chlorpromazine injected crabs were devoid of yolk. 4. 4. Neurosecretory cell type III showed no change.
3 citations