{"refrec":{"BRefID":215498,"RR":"<b>Gray, J.S.</b> (1967). Substrate selection by the archiannelid <i>Protodrilus rubropharyngeus</i>. <i>Helgol. Wiss. Meeresunters. 15(1-4)</i>: 253-269. <a href=\"https://dx.doi.org/10.1007/BF01618628\" target=\"_blank\">https://dx.doi.org/10.1007/BF01618628</a>","BEntID":330051,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Helgol. Wiss. Meeresunters. 15(1-4)</i>: 253-269. <a href=\"https://dx.doi.org/10.1007/BF01618628\" target=\"_blank\">https://dx.doi.org/10.1007/BF01618628</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gray, J.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gray, J.S.","Englishabstract":"1.Protodrilus rubropharyngeus Jägersten, a marine interstitial archiannelid, was found to move to the surface layers of sand in response to a negative geotaxis and preference for areas of highest oxygen tension.2. Strong light and vibrations tend to keep the animal just below the sand surface except on calm days.3. The adults were found to be highly gregarious.4. Both adults and larvae showed a preference for the 0.5 to 1 mm grade of sand.5. The localisation of high numbers of animals in narrow areas of a uniform beach seems to be related to the presence of a localized surface film on the sand grain surfaces. 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