Preliminary evidences of circadian fan activity rhythm in Sabella spallanzanii (Gmelin, 1791) (Polychaeta: Sabellidae)
Aguzzi, J.; Chiesa, J.J.; Caprioli, R.; Cascione, D.; Magnifico, G.; Rimatori, V.; Costa, C. (2006). Preliminary evidences of circadian fan activity rhythm in Sabella spallanzanii (Gmelin, 1791) (Polychaeta: Sabellidae). Sci. Mar. (Barc.) 70(4): 727-734. https://dx.doi.org/10.3989/scimar.2006.70n4727
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, more
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| Keywords |
Sabella spallanzanii (Gmelin, 1791) [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Aguzzi, J.
- Chiesa, J.J.
- Caprioli, R.
- Cascione, D.
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- Magnifico, G.
- Rimatori, V.
- Costa, C.
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| Abstract |
The fan activity rhythm of Sabella spallanzanii (Gmelin, 1791) and its entrainment capability to light were studied. Animals were tested under constant darkness (DD) followed by two consecutive 24 h light-darkness regimes: a first 11 h light period (LD) and a second 9 h light period, with its phase inverted (DL). An infrared analogical video-camera took shots each 30 s. A number of pictures with open fan were counted every 15 min. In DD a weak free-running periodicity in the circadian range was found, thus reinforcing the matching of the 24 h period under study in both photoperiod regimes. A nocturnal activity was characterised with a consistent anticipation to lightOFF (i.e. entrainment). Moreover, this phase of entrainment differed between DL and LD. The presence of endogenous activity rhythm with a variable phase angle of entrainment is a distinctive feature of circadian pacemakers. |
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