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8322) used the phrase "effective rate of cladogenesis," indicating "the rate at which the lineages that are still extant gave rise to new lineages that are also extant." This correctly defines the rate of increase in Nt, and the time-derivative of lnNt may be called "effective instantaneous rate of cladogenesis." However, an effective instantaneous rate thus defined has no simple relationship with the evolutionary processes generating the pattern.
(1994): r = (lnNt - lnNo) x [t.sup.-1], donde No es la concentracion inicial de organismos experimentales, Nt es la concentracion de individuos al tiempo t y t es el periodo de cultivo en dias.