{"refrec":{"BRefID":128616,"RR":"<b>Muyssen, B.T.A.; Janssen, C.R.</b> (2007). Age and exposure duration as a factor influencing Cu and Zn toxicity toward <i>Daphnia magna</i>. <i>Ecotoxicol. Environ. Saf. 68(3)</i>: 436-442","BEntID":122705,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Ecotoxicol. Environ. Saf. 68(3)</i>: 436-442","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Muyssen, B.T.A.; Janssen, C.R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Muyssen, B.T.A.; Janssen, C.R.","Englishabstract":"Standardized toxicity tests are generally performed with juvenile test organisms, e.g., in <i>Daphnia magna</i> assays neonates < 24 h old are used. The purpose of this research was to investigate the influence of a delayed exposure to Cu and Zn on population parameters and toxicity values derived from these endpoints. Juveniles (< 24 h; TO) and 7-d old daphnids (T7) were exposed for 21 and 14 d, respectively. For Cu, juveniles were significantly more sensitive than 7 d old organisms following acute (48 h) as well as chronic (14 d) exposure. After 14d of exposure to 130μg/L Cu, mortality was 80% and 10% in TO and T7, respectively. Juveniles per surviving female at this concentration decreased by 78% and 14% compared to the control. 14d-NOEC and LOEC values (based on juveniles per surviving female) were 75 and 90 μg/L Cu for TO and both> 130 μg/L for T7. For Zn, survival in TO and T7 was similar. Although T7 organisms produced significantly more offspring, 14d-NOEC and LOEC values were equal to those of TO, i.e., 80 and 115μg/L, respectively. For Cu as well as for Zn effect concentrations based on 14 and 21 d exposure were similar (results from TO). It can be concluded that acute and chronic toxicity data obtained from juvenile D. magna are more sensitive or equally sensitive than obtained from 7 d old organisms. As differences are observed between the two metals extrapolations of these conclusions to other toxicants and other aquatic species cannot be made without further investigation.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Age and exposure duration as a factor influencing Cu and Zn toxicity toward <i>Daphnia magna</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:32:52.928458","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2007,"MonPub":null,"DateUpdate":"2009-01-20","DateCreate":"2009-01-20","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":128616,"PubliDate":2007,"Pagination":"436-442","XtraPublOfAnaID":null,"ISBN":null,"Volume":"68","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42636,"SerRR":"Ecotoxicology and Environmental Safety. 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