{"refrec":{"BRefID":134105,"RR":"<b>Daan, N.</b> (1986). Results of recent time-series observations for monitoring trends in large marine ecosystems with a focus on the North Sea, <b><i>in</i></b>: Sherman, K. <i>et al.</i> (Ed.) <i>Variability and management of large marine ecosystems.</i> pp. 145-174","BEntID":128034,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Sherman, K. <i>et al.</i> <i>Variability and management of large marine ecosystems.</i> pp. 145-174","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Daan, N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Daan, N.","Englishabstract":"Examples of major changes in abundance and in biological parameters of some Norht Sea fish species are discussed, based on time-series observations derived from commercial catch data and research vessel surveys. 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