Preliminary evidences of circadian fan activity rhythm in Sabella spallanzanii (Gmelin, 1791) (Polychaeta: Sabellidae)

Scientia Marina

Juan José Chiesa¹  Jacopo Aguzzi²  Davide Cascione³  Riccardo Caprioli³  Corrado Costa³  Giuseppe Magnifico³  Valentina Rimatori³ 

[1] Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona;Institut de Ciències del Mar (CSIC). Barcelona;Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome;

关键词: sabella spallanzanii;    fan activity;    circadian rhythms;    entrainment;   

DOI  :  10.3989/scimar.2006.70n4727

来源: DOAJ

【 摘 要 】

The fan activity rhythm of Sabella spallanzanii (Gmelin, 1791) and itsentrainment capability to light were studied. Animals were tested under constantdarkness (DD) followed by two consecutive 24 h light-darkness regimes: afirst 11 h light period (LD) and a second 9 h light period, with its phaseinverted (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 weakfree-running periodicity in the circadian range was found, thus reinforcingthe matching of the 24 h period under study in both photoperiod regimes.A nocturnal activity was characterised with a consistent anticipation tolightOFF (i.e. entrainment). Moreover, this phase of entrainment differedbetween DL and LD. The presence of endogenous activity rhythm with a variablephase angle of entrainment is a distinctive feature of circadian pacemakers.

【 授权许可】

Unknown