Senckenbergiana lethaea

, Volume 79, Issue 1, pp 43–49 | Cite as

Population size and taxonomic diversity in geologic time: a brief look at two density-dependent models

  • Charles W. Harper


Density-dependent models of changes in the population size of a fossil species in geologic time, or the taxonomic diversity of a fossil group in geologic time, can be formulated using (1) the logistic equation model or (2) a piecewise linear/stochastic model ofGrenfell et al. One may test (or at least get an indication) whether or not one of the two types of models holds for a particular estimate of population size (or taxonomic diversity) Xt by plotting the value of the estimate as a function of time plus a scattergram of Xt+1 versus Xt for all pairs of estimates of population size (or taxonomic diversity) {Xt, Xt+1} successive in time.

Key words

Analytical Paleobiology logistic equations stochastic models population size taxonomic diversity 

Populationsgröße und taxonomische Diversität in geologischer Zeit: eine Kurzbetrachtung zweier dichteabhängiger Modelle


Dichte-abhängige Modelle von Wechseln in den Populationsgrößen einer fossilen Art im Laufe geologischer Zeit oder die taxonomische Diversität einer Fossilgruppe im Laufe geologischer Zeit kann man formulieren durch (1) logistische Gleichungen oder (2) durch ein stückweise lineares/stochastisches Modell vonGrenfell et al. Man mag ausprobieren, ob eines der beiden Modelle geeignet ist, die bestimmte Populationsgröße (oder taxonomischen Diversität) Xt abzuschätzen, indem der Schätzwert als Funktion der Zeit in Verbindung mit einem Streudiagramm von Xt+1 versus Xt für alle Paare von Schätzungen der Populationsgrößen (oder taxonomischen Diversität) {Xt, Xt+1} in einheitlicher Folge aufgetragen wird.


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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1999

Authors and Affiliations

  1. 1.School of Geology and GeophysicsUniversity of OklahomaNormanU.S.A.

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