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When the nights are short the activity consists of 1 brief, intense period; it extends to 2-3 periods when the nights are prolonged. The change from 2 to 1 activity periods is very sharp at the end of April. The total length of the active period was 10 h per 24 h throughout the year. Length of active period and subdivision into smaller periods is considered to be regulated by an endogenous mechanism. Seasonal variations in activity levels are correlated to migratory behaviour in the field and to the reproductive cycle.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Seasonal and diel activity variations in the shrimp <i>Palaeomon adspersus</i> from a brackish, non-tidal area","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":1980,"MonPub":null,"DateUpdate":"2009-05-14","DateCreate":"2009-05-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":135490,"PubliDate":1980,"Pagination":"329-335","XtraPublOfAnaID":null,"ISBN":null,"Volume":"2","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. 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