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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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TL;DR: Results show that U. pugilator has the basic molecular machinery for color perception, perhaps even trichromatic vision.
Abstract: SUMMARY Fiddler crabs are intertidal brachyuran crabs that belong to the genus Uca . Approximately 97 different species have been identified, and several of these live sympatrically. Many have species-specific body color patterns that may act as signals for intra- and interspecific communication. To understand the behavioral and ecological role of this coloration we must know whether fiddler crabs have the physiological capacity to perceive color cues. Using a molecular approach, we identified the opsin-encoding genes and determined their expression patterns across the eye of the sand fiddler crab, Uca pugilator . We identified three different opsin-encoding genes ( UpRh1, UpRh2 and UpRh3 ). UpRh1 and UpRh2 are highly related and have similarities in their amino acid sequences to other arthropod long- and medium-wavelength-sensitive opsins, whereas UpRh3 is similar to other arthropod UV-sensitive opsins. All three opsins are expressed in each ommatidium, in an opsin-specific pattern. UpRh3 is present only in the R8 photoreceptor cell, whereas UpRh1 and UpRh2 are present in the R1-7 cells, with UpRh1 expression restricted to five cells and UpRh2 expression present in three cells. Thus, one photoreceptor in every ommatidium expresses both UpRh1 and UpRh2 , providing another example of sensory receptor coexpression. These results show that U. pugilator has the basic molecular machinery for color perception, perhaps even trichromatic vision.
46 citations
TL;DR: Affinity-based purification and characterization of the collagenolytic serine protease 1 from Uca pugilator (fiddler crab) hepatopancreas shows that the enzyme cleaves peptide bonds adjacent to Leu and Gln at the P1 position more efficiently than trypsin, chymotrypsin; the efficiency of collagenase toward P1-Arg substrates is equivalent to that oftrypsin.
46 citations
TL;DR: Dopamine produces pigment concentration in the erythrophores of intact fiddler crabs, but has no effect on the eries in isolated legs, and it is hypothesized that DA triggers release of red pigment-concentrating hormone.
46 citations
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: DDT accelerated the rate of limb regeneration and, in the case of animals with multiple autotomy, shortened the time to ecdysis as well, these responses may be a result of heightened excitation of the nervous system produced by DDT and the resulting secretion of neuroendocrine factors promoting limb regenerate and molting.
46 citations