{"refrec":{"BRefID":230904,"RR":"<b>Beukema, J.J.; Dekker, R.</b> (2013). Evaluation of Brey's production/biomass model on the basis of along-term data set on a clam population. <i>Mar. Ecol. Prog. Ser. 489</i>: 163-175. <a href=\"http://dx.doi.org/10.3354/meps10409\" target=\"_blank\">dx.doi.org/10.3354/meps10409</a>","BEntID":222616,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 489</i>: 163-175. <a href=\"https://dx.doi.org/10.3354/meps10409\" target=\"_blank\">https://dx.doi.org/10.3354/meps10409</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Beukema, J.J.; Dekker, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Beukema, J.J.; Dekker, R.","Englishabstract":"The Brey model is one of the most frequently used methods to obtain a quick estimate of the secondary production (P) of an area. It is based on an empirical relationship between the production/biomass (P/B) ratio and the (annual) mean weight (W) of the individuals of a population. Estimates of P/B by this model are frequently obtained by using only single measurements of W and B, thus circumventing tedious efforts required by conventional methods. The obtained P values of communities are sums of estimates made for individual species. Any constraints of the model can be fully understood only by evaluating it for single-species populations. Using an extensive data set obtained by monitoring a population of the bivalve Macoma balthica for 33 yr, we evaluated the model by comparing Brey model estimates of P and P/B with direct annual estimates. We corroborate the basis of the model by presenting a significant relationship between observed annual values of W and P/B. The model satisfactorily predicted P when late-winter (but not late-summer) assessments of W and B were used. The model underestimated P/B in the years with high mortality rates (Z), whereas it overestimated P/B in almost all other years. Z values were a better basis for predictions of P/B than Wvalues. The model could predict P/B well on the exclusive basis of W due to the significant correlation between W and Z (low Z values resulted in older and thus heavier individuals). Multi-year averages of model-predicted and observed P/B estimates were similar only when predictions were based on late-winter or annual (not on summer) estimates of W and B. In conclusion, the model cannot be recommended for precise and unbiased P estimates in a single species when no more than a once-only assessment of Wand B is available.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Evaluation of Brey's production/biomass model on the basis of along-term data set on a clam population","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":"Biomass; Secondary production; Individual weight; Mortality rate; Macomabalthica; Bivalve; Wadden Sea; Tidal flats; Long-term data series","OtherDescriptors":null,"Notes":null,"AnaPub":2013,"MonPub":null,"DateUpdate":"2014-07-16","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000323941000013","VABBcode":null,"OpenAcc":1,"DOI":"10.3354/meps10409"},"refs":null,"anarec":{"AnaID":230904,"PubliDate":2013,"Pagination":"163-175","XtraPublOfAnaID":null,"ISBN":null,"Volume":"489","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. 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