{"refrec":{"BRefID":107928,"RR":"<b>Aguzzi, J.; Chiesa, J.J.; Caprioli, R.; Cascione, D.; Magnifico, G.; Rimatori, V.; Costa, C.</b> (2006). Preliminary evidences of circadian fan activity rhythm in <i>Sabella spallanzanii</i> (Gmelin, 1791) (Polychaeta: Sabellidae). <i>Sci. Mar. (Barc.) 70(4)</i>: 727-734. <a href=\"https://dx.doi.org/10.3989/scimar.2006.70n4727\" target=\"_blank\">https://dx.doi.org/10.3989/scimar.2006.70n4727</a>","BEntID":102724,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Sci. Mar. (Barc.) 70(4)</i>: 727-734. <a href=\"https://dx.doi.org/10.3989/scimar.2006.70n4727\" target=\"_blank\">https://dx.doi.org/10.3989/scimar.2006.70n4727</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Aguzzi, J.; Chiesa, J.J.; Caprioli, R.; Cascione, D.; Magnifico, G.; Rimatori, V.; Costa, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Aguzzi, J. <i>et al.</i>","Englishabstract":"The fan activity rhythm of <em>Sabella spallanzanii</em> (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. 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