Topic
Uca pugilator
About: Uca pugilator is a research topic. Over the lifetime, 376 publications have been published within this topic receiving 12303 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors found that histamine (HA) is a stimulator of H1 and H2 receptors, which produced dose-dependent inhibition of the melanin dispersion which normally occurs when fiddler crabs, Uca pugilator, are transferred from a white to a black background.
Abstract: Histamine (HA), a stimulator of H1 and H2 receptors, produced dose-dependent inhibition of the melanin dispersion which normally occurs when fiddler crabs, Uca pugilator, are transferred from a white to a black background. The HA precursor L-histidine, and 4-methyl histamine (4-MeHA), an H2 receptor agonist, also inhibited melanin dispersion. 2-Methyl histamine (2-MeHA), an H1 receptor agonist, enhanced melanin dispersion. The inhibitory effects of HA and 4-MeHA were abolished by the H2 receptor blocker metiamide but not by blockers of either H1 receptors or alpha1 adrenoceptors. Melanin-dispersing hormone (MDH) release is accomplished mainly by stimulation of alpha1 adrenoceptors with norepinephrine appearing to be the neurotransmitter involved. The H1 receptor blockers pyrilamine and SA-97 antagonized 2-MeHA. HA-induced inhibition of melanin dispersion was potentiated by the noradrenergic neuron blocker bretylium and the alpha2 adrenoceptor agonist B-HT 933. HA did not significantly affect melanin dispe...
7 citations
6 citations
TL;DR: Synthetic Pandalus red pigment-concentrating hormone and extracts of eyestalks from Uca pugilator and Palaemonetes vulgaris were passed through a column of Bio-Gel P-6, indicating that these three red pigment’s hormones have either the same or nearly the same molecular size.
6 citations
TL;DR: It is suggested that neural responsiveness is stimulated by glucose, and that elevated glucose in intact crabs results in release of feeding inhibitory factor from the sinus gland.
Abstract: Uca pugilator, the sand fiddler crab, is a deposit-feeder. It feeds on exposed sand flats as the tide recedes. Feeding movements are evoked by stimulation of chemoreceptors on the dactyls. Previous studies have demonstrated that a proteinaceous factor associated with the sinus gland region inhibits chemically-stimulated feeding behavior. Here, that work is extended to show the existence of a similar inhibitory factor present in the hemolymph of fed crabs in the laboratory and in the hemolymph of crabs returning from feeding in the field. The factor is not detected in fasted laboratory crabs or in field crabs walking from burrow areas to feeding sites. Injection of glucose results in inhibition of feeding activity in intact crabs. Injection of glucose, but not galactose, stimulates feeding in eyestalk-ablated crabs. We suggest that neural responsiveness is stimulated by glucose, and that elevated glucose in intact crabs results in release of feeding inhibitory factor from the sinus gland. Release of feeding inhibitory factor into the blood enables crabs to return to burrow areas without stopping when they encounter food-laden sediments.
6 citations
TL;DR: The findings of enzymes present in egg mass fluid throughout maturation inform a large body of work on pheromones and hatching cues for blue crabs and suggest that the same suite of enzymes is important to biochemically manage biofilms in two ecologically relevant contexts.
6 citations