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On the interpretation of age–intensity profiles and dispersion patterns in parasitological surveys

  • H. P. DUERR (a1) (a2), K. DIETZ (a1) and M. EICHNER (a1)
  • DOI: http://dx.doi.org/10.1017/S0031182002002561
  • Published online: 01 February 2003
Abstract

The present paper describes how age–intensity profiles of macroparasite burdens are affected by processes underlying the distribution of the parasite numbers in host populations. In a comparative way, we consider the following 6 processes: (i) age-dependent exposure, (ii) parasite-induced host mortality, (iii) heterogeneity within the host population, (iv) clumped infection, (v) density-dependent parasite mortality and (vi) density-dependent parasite establishment. For each of these processes, we show typical patterns in the age–intensity profile and provide, if possible, explicit and simple solutions for the age-dependent mean parasite burden and the corresponding dispersion patterns. Emphasis is given to density-dependent parasite establishment and to age–intensity profiles resulting from the superposition of different processes. By means of 2 examples we show that the interpretation of observed patterns can be ambiguous if more than 1 process takes place. These findings underline that age–intensity profiles should be interpreted on the basis of available a priori knowledge about the processes assumed to be involved. For purposes of testing different hypotheses, a simulation program is provided with which discrepancies between model prediction and data can be explored.

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Corresponding author
Corresponding author: Department of Medical Biometry, University of Tübingen, Westbahnhofstrasse 55, 72070 Tübingen, Germany. Tel: +49 7071 2978259. Fax: +49 7071 295075. E-mail: hans-peter.duerr@uni-tuebingen.de
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Parasitology
  • ISSN: 0031-1820
  • EISSN: 1469-8161
  • URL: /core/journals/parasitology
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