{"refrec":{"BRefID":111829,"RR":"<b>Holmström, W.F.; Morgan, E.</b> (1983). Variation in the naturally occurring rhythm of the estuarine amphipod, <i>Corophium volutator</i>. <i>J. Mar. Biol. Ass. U.K. 63(4)</i>: 833-850. <a href=\"http://dx.doi.org/10.1017/S0025315400071253\" target=\"_blank\">http://dx.doi.org/10.1017/S0025315400071253</a>","BEntID":106446,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Biol. Ass. U.K. 63(4)</i>: 833-850. <a href=\"http://dx.doi.org/10.1017/S0025315400071253\" target=\"_blank\">http://dx.doi.org/10.1017/S0025315400071253</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Holmström, W.F.; Morgan, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Holmström, W.F.; Morgan, E.","Englishabstract":"The endogenous activity rhythm of the estuarine amphipod <i>Corophium volutator</i> has been studied by direct observation and with the use of time lapse photography. The rhythm persists under constant conditions having a free running period of between 12 and 13 h, and with activity maxima occurring during the early ebb. Freshly collected animals show a rhythm which is modulated on a semi-lunar basis, the activity maxima being attenuated during the neap tide periods, and the rhythm has also been found to vary in definition throughout the year. 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