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Marine Biology

, Volume 101, Issue 3, pp 347–354 | Cite as

External synchronizers of tidal activity rhythms in the prawns Penaeus indicus and P. monodon

  • P. Natarajan
Article

Abstract

Phasing of persistent circatidal rhythmicity to an artificial tidal cycle was assessed in the prawns Penaeus indicus Milne Edwards and P. monodon (Fabricius) collected from the Vellar estuary, South India, in the period between June and December 1984. Simulated 6 h cycles of 20 and 30‰ S, and 6 h cycles of 20° and 30°C induced a persistent tidal rhythmicity after 20 cycles. The imposed 6 h cycles of 25 and 30‰ S, and 25° and 30°C induced tidal rhythms after 30 cycles. In both cases, re-established tidal activity rhythms were evident for at least 48 h — higher activity occurring during the higher salinity and lower temperature phases of the simulated tidal cycles. Artificial tidal cycles of still water and running water synchronized the tidal rhythm after 20 cycles. Combined 30‰ S, 20°C, for 6 h and 20‰ S and 30°C for 6 h established a persistent tidal rhythm after 10 cycles, whereas wave action had no influence on tidal synchronization. The influence of possible interactions of tidal rhythms and in situ tidal variables on circatidal activity is discussed.

Keywords

India High Activity High Salinity Wave Action Tidal Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • P. Natarajan
    • 1
    • 2
  1. 1.Centre of Advanced Study in Marine BiologyAnnamalai UniversityParangipettaiIndia
  2. 2.Pukkulam (PO)India

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