{"refrec":{"BRefID":3576,"RR":"<b>Vranken, G.; Herman, P.M.J.; Vincx, M.; Heip, C.H.R.</b> (1986). A re-evaluation of marine nematode productivity. <i>Hydrobiologia 135</i>: 193-196","BEntID":3576,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Hydrobiologia 135</i>: 193-196","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vranken, G.; Herman, P.M.J.; Vincx, M.; Heip, C.H.R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vranken, G. <i>et al.</i>","Englishabstract":"Nematodes are the most abundant multicellular animals in marine sediments but their role in the benthos has not been properly quantified yet. In nearly all energy-flow budgets of marine systems their annual production P is given as about nine times their biomass B and their part in the total energy-flow is consequently estimated as anywhere between 3 and 30% of the total (carbon) input in the benthic system. Our laboratory experiments demonstrate that nematode productivity is much higher than P/B ~ 9 per year and may reach values of over 60 for bacterial grazers. To obtain more reliable estimates for field populations we propose a regression equation relating egg-to-egg development time T<sub>min</sub> to temperature (t) and adult female weight (W in µg wet weight):log T<sub>min</sub> = 2.202-0.0461 t + 0.627 log W. When multiplied by the constant biomass turnover per generation (P/B)<sub>gen</sub> = 3, development rate 1/T<sub>min</sub> is a good predictor of daily P/B. This method was applied to two series of field data. A rather stable community from a sublittoral mud in the North Sea had an annual P/B = 20. 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