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Circatidal and circadian rhythms of locomotion in Limulus polyphemus

, : Circatidal and circadian rhythms of locomotion in Limulus polyphemus. Biological Bulletin 207(1): 72-75

The nocturnal increases in the sensitivity of the lateral eye of Limulus polyphemus, the species of horseshoe crab found along the Atlantic coast, have been firmly established as being controlled by an endogenous circadian clock (1, 2, 3) located in the brain (4). Virtually nothing is known, however, about the control of the animal's behavioral rhythms of mating and spawning that are observed in the intertidal zone during high tides in late spring (5, 6, 7). Many other marine species, especially intertidal crabs, exhibit similar rhythmic behaviors that have been demonstrated to be under the control of endogenous clocks that are circatidal (8, 9, 10, 11, 12), circadian (10, .12), or both. While there is some evidence that the activity of juvenile horseshoe crabs is primarily nocturnal (13, 14), and possibly controlled by a circadian clock (14), we know of no published work showing that locomotor activity in the adult is endogenously controlled on either a 12.4-h (circatidal) or 24-h (circadian) basis. We report here that locomotor activity in adult individuals of L. polyphemus is endogenously modulated on both a circatidal and a circadian basis and that when the animals are subjected to a light-dark (LD) cycle, most activity occurs at night.

Accession: 011861136

PMID: 15315945

DOI: 10.2307/1543630

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Related references

Watson, W.H.; Bedford, L.; Chabot, C.C., 2008: Rhythms of locomotion expressed by Limulus polyphemus, the American horseshoe crab: II. Relationship to circadian rhythms of visual sensitivity. In the laboratory, horseshoe crabs express a circadian rhythm of visual sensitivity as well as daily and circatidal rhythms of locomotion. The major goal of this investigation was to determine whether the circadian clock underlying changes in visu...

Chabot, C., C.; Betournay, S., H.; Braley, N., R.; Watson, W., H.I.i, 2007: Endogenous rhythms of locomotion in the American horseshoe crab, Limulus polyphemus. American horseshoe crabs (Limulus polyphemus) exhibit clear circadian rhythms of visual sensitivity in the laboratory and in the field they exhibit seasonal patterns of mating behavior that are closely associated with the tides. Recent reports su...

Barlow R.B.Jr; Kaplan E.; Renninger G.H.; Saito T., 1985: Efferent control of circadian rhythms in the limulus polyphemus lateral eye. Neuroscience Research (SUPPL 2): S65-S78

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