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Locomotor activity rhythms of continental slope Nephrops norvegicus (Decapoda: Nephropidae)
Aguzzi, J.; Company, J.B.; Abelló, P. (2004). Locomotor activity rhythms of continental slope Nephrops norvegicus (Decapoda: Nephropidae). J. Crust. Biol. 24(2): 282-290
In: Journal of Crustacean Biology. Crustacean Society: Washington. ISSN 0278-0372, more
Peer reviewed article  

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Keywords
    Activity patterns; Circadian rhythms; Continental slope; Light effects; Light intensity; Locomotion; Nephrops norvegicus (Linnaeus, 1758) [WoRMS]; MED, Western Mediterranean [Marine Regions]; Marine

Authors  Top 
  • Aguzzi, J.
  • Company, J.B.
  • Abelló, P.

Abstract
    The locomotor rhythmicity of the Norway lobster Nephrops norvegicus was studied under constant conditions of darkness in individuals collected on the continental slope (400-430 m). Periodogram analysis revealed the occurrence of both circadian (of around 24 h) and ultradian (of around 12 and 18 h) periodicities. Form estimate analysis of the circadian and ultradian time series revealed the occurrence of significant peaks of activity during the expected night phase of the cycle and day-night transitions, respectively. No ultradian locomotor activity rhythms have been reported in previous studies on continental shelf N. norvegicus, suggesting that this phenomenon may be limited to deep-water animals. A discussion is presented to account for the occurrence of the mechanism of ultradian rhythms when there is significant environmental light intensity reduction, as on the continental slope, where the species attains its maximum densities in the western Mediterranean.

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