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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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Journal ArticleDOI
TL;DR: Estimation of locomotion economy for Uca pugilator was within the range predicted for a vertebrate of a similar mass, and the minimum cost of transport, the least amount of energy required to transport a given mass a distance, was determined using both aerobic and anaerobic sources.
Abstract: The fiddler crab, Uca pugilator, used sideways octapedal locomotion during 15 min of treadmill exercise. At each velocity tested (0.06, 0.11 and 0.16 km h−1), oxygen consumption (VOO2) showed only a modest, sluggish elevation; a ‘steady-state’ was never attained. The highest VOO2 recorded, 0.22 mlO2g−1h−1, was 4.4 times the resting rate. Net whole body lactate (WBL) was found to increase at a constant rate throughout the exercise period. During recovery, VOO2 and WBL removal followed a similar time course and returned to pre-exercise rates in 30–45 min. Although the fate of lactate after exercise is unknown for crustaceans, calculations suggest that not enough oxygen is consumed by the crab during recovery to oxidize lactate completely to CO2 and H2O. A gluconeogenic fate is compatible with the data. As running velocity was increased, VOO2 increased only slightly, while the net rate of WBL production showed a substantial elevation. At low velocity aerobic metabolism accounted for 60% of the ATP produced when aerobic metabolism and anaerobic fermentation are considered. Anaerobic fermentation dominated at medium and high velocity and produced 60 and 70% of the ATP, respectively. The minimum cost of transport, the least amount of energy required to transport a given mass a distance, was determined using both aerobic and anaerobic sources. This estimation of locomotion economy for Uca pugilator was within the range predicted for a vertebrate of a similar mass.

76 citations

Journal ArticleDOI
TL;DR: There is, however, no conclusive evidence that the hepatopancreas is not a target tissuc for the hyperglycemic hormone, and it is assumed that integumentary tissue and muscle are the most important target tissues in hormonally induced hyperglycemia.

76 citations

Journal ArticleDOI
TL;DR: This study looked for interactions in hypersaline soils bordering unvegetated salt pans in a Georgia salt marsh and found no evidence that plants supported burrow walls, suggesting crabs likely associate with vegetation to avoid predators.

75 citations

Journal ArticleDOI
TL;DR: UpEcR and UpRXR genes were expressed simultaneously in tissues, supporting the possibility of heterodimerization for EcR and RXR in vivo and in some tissues, however, levels of transcripts differed, suggesting other possible receptor interactions.

70 citations

Journal ArticleDOI
TL;DR: It has been concluded that crabs categorize stimuli as dangerous or otherwise by their position relative to the crabs’ visual horizon.
Abstract: Male fiddler crabs, Uca pugilator (Crustacea: Decapoda), respond to conspecifics by claw waving, and to predators by freezing or escape. In field experiments it was found that this distinction was not made on the basis of angular size and speed, nor was shape important. The remaining possibilities were either the absolute size of the stimulus, determined from angular size and distance, or the position of the stimulus relative to the horizon. To distinguish between these, a crab was placed in a glass dish, and moved black stimuli on a white background, at a distance of 22 cm. Stimuli below the crab's horizon hardly ever evoked escape. However, identical stimuli partially or wholly above the crab's horizon produced escape responses whose frequency varied with the angular size of the stimulus. Halving the distance of the stimulus showed that it was angular and not absolute size that determines escape frequency; and experiments with a tilted horizon showed that it is the position of the stimulus relative to the eye equator that is important, rather than the geographical horizon itself. It has been concluded that crabs categorize stimuli as dangerous or otherwise by their position relative to the crabs’ visual horizon.

70 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20211
20176
20162
20153
20146
20137