{"refrec":{"BRefID":112531,"RR":"<b>Riisgård, H.U.</b> (2007). Feeding behaviour of the hydromedusa <i>Aequorea vitrina</i>. <i>Sci. Mar. (Barc.) 71(2)</i>: 395-404","BEntID":107101,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Sci. Mar. (Barc.) 71(2)</i>: 395-404","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Riisgård, H.U.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Riisgård, H.U.","Englishabstract":"Supplementary material available at: <A href='http://www.icm.csic.es/scimar/supplm/71/n2395sm.html'  target=_blank >this site</a>The prey-capture mechanism of the hydromedusa <i>Aequorea vitrina</i> was studied by means of laboratory video-microscope observations. In stagnant water <i>A. vitrina</i> remains stationary with its very long (about 4x bell diameter) marginal tentacles motionless hanging down in the water, ready for ambush capture of prey organisms that collide with the tentacles. <i>A. vitrina</i> was found to be efficient at capturing brine shrimps (<i>Artemia salina</i>), less efficient at capturing rotifers (<i>Brachionus plicatilis</i>), and very inefficient at capturing copepods (<i>Acartia tonsa</i>). The initial hauling up of an extended marginal tentacle with an adhering prey is fast (>10 mm s<sup>-1</sup>). Both the bell margin and the mouth move towards each other so that the captured prey can be transferred from the tentacle to the elongated mouth-lips to be further transported into the mouth and stomach. It takes about 20 s from when an <i>Artemia</i> prey organism encounters a tentacle until it is transferred to the mouth-lips. The subsequent digestion in the stomach takes about 30 min. When <i>A. vitrina</i> encounters a jellyfish-prey (a small medusa of <i>Aurelia aurita</i>), it starts to swim in order to adhere the relatively big prey to its mouth-lips. Then <i>A. vitrina</i> opens its mouth wide to swallow the captured medusa, a process which takes about 15 to 20 min. The subsequent digestion takes 2 to 3 h. Field observations of undisturbed <i>A. vitrina</i> made by snorkelling in the Limfjord (Denmark) revealed that the feeding behaviour was similar to that observed in the laboratory in stagnant water. It is concluded that <i>A. vitrina</i> is an ambush-predator, and not a cruising-predatory medusa as previously suggested.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Feeding behaviour of the hydromedusa <i>Aequorea vitrina</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2007,"MonPub":null,"DateUpdate":"2007-08-09","DateCreate":"2007-08-09","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000247328800018","VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":112531,"PubliDate":2007,"Pagination":"395-404","XtraPublOfAnaID":null,"ISBN":null,"Volume":"71","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43791,"SerRR":"Scientia Marina (Barcelona). 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