{"refrec":{"BRefID":125824,"RR":"<b>Boudreau, B.P.; Choi, J.; Meysman, F.; François-Carcaillet, F.</b> (2001). Diffusion in a lattice-automaton model of bioturbation by small deposit feeders. <i>J. Mar. Res. 59(5)</i>: 749-768","BEntID":119987,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Mar. Res. 59(5)</i>: 749-768","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Boudreau, B.P.; Choi, J.; Meysman, F.; François-Carcaillet, F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Boudreau, B.P. <i>et al.</i>","Englishabstract":"The mixing of <sup>210</sup>Pb and tagged particles is examined in a lattice-automaton model for bioturbation containing small deposit feeders. The values of the biodiffusion coefficient, <I>D<sub>B</sub></I>, calculated using typical biological parameter values, i.e., size, abundance, feeding and locomotion rates, are similar to those expected from marine sediments of a given sedimentation rate. Most biological parameters appear to exert primarily linear effects on <I>D<sub>B</sub></I> values, while most nonlinearities seem to be model artifacts or failures of the assumptions in the basic <I>D<sub>B</sub></I> model. The model highlights the importance of ingestion-egestion, over simple particle displacement, as an agent of bioturbation. The tagged particles are used to calculate root-mean-squared displacement plots, which are linear over long time spans, indicating diffusive behavior. However, initial trends on such plots are not usually linear, indicating that the calculated <I>D<sub>B</sub></I> is time dependent for surprisingly long periods after the beginning of such experiments. 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