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The impact of photoperiodicity on hatching of Loligo vulgaris and Loligo forbesi
Paulij, W.P.; Herman, P.M.J.; Van Hannen, E.J.; Denucé, J.M. (1990). The impact of photoperiodicity on hatching of Loligo vulgaris and Loligo forbesi. J. Mar. Biol. Ass. U.K. 70: 597-610
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keywords
    Loligo forbesii Steenstrup, 1856 [WoRMS]; Loligo vulgaris Lamarck, 1798 [WoRMS]; Marine

Authors  Top 
  • Paulij, W.P.
  • Herman, P.M.J., more
  • Van Hannen, E.J.
  • Denucé, J.M., more

Abstract
    The influence of photoperiodicity on hatching of Loligo forbesi and Loligo vulgaris embryos was investigated under different experimental light-dark (LD) conditions. The transition from light to dark stimulated hatching and functions as a "Zeitgeber" or synchronizer. Independent of the timing and duration of the dark period most embryos hatched soon after termination of the light period. Embryos which had developed in constant light showed no hatching rhythm at all. If these embryos were exposed to a dark shock most embryos hatched soon after the onset of darkness. A twilight shock, in which the light was reduced by 50% (i.e. 50 mu E/s/m super(2)), could not stimulate hatching. Embryos which were kept from stage X on in an artificially controlled LD cycle, preferentially hatch in a period which coincides with the period at which darkness usually occurred when placed in constant illumination from stage XX onwards.

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