Results 211 to 220 of about 8,513 (255)
Some of the next articles are maybe not open access.
Neural asymmetry in male fiddler crabs
Brain Research, 1983In adult male fiddler crabs, Uca pugnax, there is a marked enlargement of the 1st thoracic ganglion and its nerve root on the side of the major cheliped compared to the side of the minor cheliped. Retrograde uptake of cobalt via the cut ends of the motoneurons revealed a significant hypertrophy of their somata and dendritic fields on the major side of ...
R E, Young, C K, Govind
openaire +2 more sources
MODELING ACTIVITY RHYTHMS IN FIDDLER CRABS
Chronobiology International, 2009Burrowing crabs of the genus Uca inhabit tidal mudflats and beaches. They feed actively during low tide and remain in their burrows when the tide is high. The timing of this activity has been shown to persist in the absence of external light and tidal cues, indicating the presence of an internal timing mechanism.
Christopher J, Dugaw +3 more
openaire +2 more sources
Displacement Activities in Fiddler Crabs
Nature, 1955ACCORDING to Tinbergen1, a “displacement activity is an activity belonging to the executive motor pattern of an instinct other than the instinct (s) activated”, and, according to Bastock, Morris and Moynihan2, such activities would seem to take place in two quite different situations: “(1) Displacement activities may be performed by an animal in which ...
openaire +2 more sources
Simulated fiddler-crab sediment mixing
Journal of Marine Research, 2007Using a lattice-automaton model, we simulate the effects of fiddler crabs on the distribution of excess Pb in marsh sediments. Three previously-identified modes of bioturbation are investigated: (1) removal-and-fill, where material is excavated to the sediment-water interface and burrows, when abandoned, are subsequently filled by surface material, (2)
Katherine Huang +2 more
openaire +1 more source
Synchronized courtship in fiddler crabs
Nature, 1998The apparent paradox posed by the synchronization of mating displays by males competing to attract females has provoked considerable interest among evolutionary biologists1,3. Such synchronized sexual signalling has only been documented for communicationusing light flashes (bioluminescence) or sound.
Backwell, Patricia R. Y. +3 more
openaire +1 more source
Assortative mating in a fiddler crab
Behaviour, 2016Non-random mating, particularly positive size-assortative mating, is common and can have major evolutionary consequences. The causes of size-assortative mating, however, are rarely examined. Here we explore the possibility of sexual selection, mate availability and mating constraints causing the strong correlation between male and female sizes in the ...
H.L. Clark, P.R.Y. Backwell
openaire +1 more source
Temperature variation in fiddler crab microhabitats
Journal of Experimental Marine Biology and Ecology, 1976Abstract Measurements of the thermal environment at the microhabitat level provided data to evaluate the seasonal, diel, and spatial patterns of activity for non-tidal fiddler crabs ( Ucapanacea and U. virens ) on Mustang Island, Texas. Field populations showed nocturnal and diurnal maxima of surface activity during the warm summer months ...
Lawrence W. Powers, James F. Cole
openaire +1 more source
Sand-bubbler crabs distinguish fiddler crab signals to predict intruders
Behavioral Ecology and Sociobiology, 2021There is growing evidence that animals gain information from heterospecifics, but utilising other species’ signals has rarely been reported in invertebrates. Herein, I conducted field experiments in a mixed colony of two crab species, Scopimera globosa and Austruca lactea, to test whether S.
openaire +1 more source
Accumulation of sediment-bound PCBs by fiddler crabs
Bulletin of Environmental Contamination and Toxicology, 1986The 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.
J R, Clark +3 more
openaire +2 more sources
Acoustic Interneurons of Fiddler and Ghost Crabs
Physiological Zoology, 1976The properties of acoustic interneurons in fiddler (Uca pugilator and U. minax) and ghost (Ocypode quadrata) crabs are described, as revealed by tests with pure tones. Three types of interneurons were present in all species: tonic, which fired for the duration of the stimulus; phasic, which fired briefly at the onset of stimulation; and inhibited, in ...
Michael Salmon, Kenneth Horch
openaire +1 more source