{"refrec":{"BRefID":14362,"RR":"<b>Williams, R.; Conway, D.V.P.</b> (1982). Population growth and vertical distribution of <i>Calanus helgolandicus</i> in the Celtic Sea. <i>Neth. J. Sea Res. 16</i>: 185-194","BEntID":14362,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Neth. J. Sea Res. 16</i>: 185-194","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Williams, R.; Conway, D.V.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Williams, R.; Conway, D.V.P.","Englishabstract":"<i>Calanus helgolandicus</i> overwinters in the shallow waters ( 100 m) of the Celtic Sea as copepodite stages V and VI; the minimum temperature in winter is approximately 8.0°C. This over-wintering is not a true hibernation or dormancy, accompanied by a reduced metabolic state with a discontinuation of feeding and development, but more of a lowered activity, involving reduced feeding and development, with predation on available microzooplankton and detritus. Analysis of specimens from the winter population showed that copepodite stages V and VI were actively feeding and still producing and possibly liberating eggs. The absence of late nauplii and young copepodites in the water column until late March indicated that there must be a high mortality of these winter cohorts. The copepodites of the first generation appeared in April-May, the younger stages, copepodites I to III, being distributed deeper in the water column below the euphotic zone and thermocline, This distribution would contribute to a much slower rate of development. By August the ontogenetic vertical distributions observed in the copepodites were reversed, the younger stages occurring in the warmer surface layers within the euphotic zone. Diurnal migrations were observed in the later copepodites only, the younger stages I to III either remaining deep in spring or shallow in summer. The causal mechanisms which alter the behaviour of the young copepodites remain unexplained. The development of the population of <i>Calanus helgolandicus</i> in 1978, reaching its peak of abundance in August, was typical for the shelf seas around U .K. as observed from Continuous Plankton Recorder data, 1958 to 1977.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Population growth and vertical distribution of <i>Calanus helgolandicus</i> in the Celtic Sea","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1982,"MonPub":null,"DateUpdate":"2015-10-06","DateCreate":"2001-07-31","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":14362,"PubliDate":1982,"Pagination":"185-194","XtraPublOfAnaID":null,"ISBN":null,"Volume":"16","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44573,"SerRR":"Netherlands Journal of Sea Research. 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