Topic
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: It is postulated that the lipoprotein serves as a carrier for the polypeptide within neurosecretory cells and possibly in the blood.
11 citations
TL;DR: The results are consistent with the hypothesis that presynaptic adrenoceptors very similar to alpha2 adrenoception of mammals regulate impulse-mediated norepinephrinergic neurotransmission in the fiddler crab Uca pugilator, nore Pinepinephrine triggering release of a melanin-dispersing hormone.
Abstract: 1. The specific alpha2 adrenoceptor agonist B-HT 933 significantly reduced the rate of melanin dispersion in crabs transferred from a white to a black background. 2. The specific alpha2 adrenoceptor blockers rauwolscine and yohimbine significantly increased the rate of melanin dispersion in crabs transferred from a white to a black background. 3. Rauwolscine and yohimbine, but not the alpha, adrenoceptor blocker indoramin, antagonized B-HT 933. 4. In crabs pretreated with the catecholaminergic neurotoxin 6-hydroxydopamine, which inhibits melanin dispersion, B-HT 933 did not produce further significant inhibition in the rate of melanin dispersion. 5. None of the drugs has been found to affect melanin migration in melanophores of isolated legs. 6. The results are consistent with the hypothesis that presynaptic adrenoceptors very similar to alpha2 adrenoceptors of mammals regulate impulse-mediated norepinephrinergic neurotransmission in the fiddler crab Uca pugilator, norepinephrine triggering release of a melanin-dispersing hormone.
11 citations
TL;DR: Adult female Uca pugilator were allowed to make spontaneous choices during low tide toward lights differing in intensity only, and response patterns shows that crabs consistently approached the dimmer of two white lights, but if two blue or two red-orange lights were presented, the brighter light was approached more frequently.
10 citations
TL;DR: Results suggest that the sinus gland contains a proteinaceous factor that can control feeding in Uca pugilator, a deposit-feeding semiterrestrial crab.
10 citations
TL;DR: It was considered desirable to determine if the eye-stalk hormone (ESH) has the same property as pitressin, and to test this, eye-stalks of the fiddler crab, Uca pugilator, were excised and desiccated after the animals had been light adapted for 3 hours.
Abstract: IT HAS BEEN SHOWN by Perkins (1) that color in the marine Crustacea is controlled by a hormone elaborated in the stalked eyes of these animals. Smith (2) showed this to hold true also in a fresh water form. Perkins and Kropp have later shown (3, 4) that this hormone is capable of producing melanophore expansion comparable to the effect of pitressin in fish and tadpoles. In view of the fact that pitressin, commonly used as an activator for amphibian melanophores, has an effect upon the water uptake of these animals (5) it was considered desirable to determine if the eye-stalk hormone (ESH) has the same property. Melanophores were measured at the same time to see if the proportion of water uptake to melanophore expansion was similar to that produced by pitressin. To test this, eye-stalks of the fiddler crab, Uca pugilator, were excised and desiccated after the animals had been light adapted for 3 hours.
10 citations