Variation in infection parameters among populations within parasite species: intrinsic properties versus local factors

International Journal for Parasitology
R Poulin

Abstract

Within any parasite species, variation among populations in standard infection parameters (prevalence, intensity and abundance) is an accepted fact. The proportion of hosts infected and the mean number of parasites per host are not fixed values across the entire geographic range of any parasite species. The question is whether this inter-population variation occurs within a narrow, species-specific range and is thus driven mainly by the biological features of the parasite, or whether it is substantial and unpredictable, leaving population parameters at the mercy of local conditions. Here, the repeatability of estimates of prevalence, intensity and abundance of infection was assessed across populations of the same parasite species, for 77 metazoan parasite species of Canadian freshwater fishes. Overall, parameter values from different populations of the same parasite species were more similar to each other and more different from those of other species, than expected by chance alone. Much of the variation in parameter values in the dataset was associated with differences between parasite species, rather than with differences among populations within species. This was particularly true for intensity and abundance of infection; in...Continue Reading

Citations

Aug 10, 2006·Oecologia·Boris R KrasnovRobert Poulin
Jun 26, 2008·The Journal of Parasitology·Luiz E R Tavares, José L Luque
Jul 9, 2008·The Journal of Parasitology·Diego Santiago-AlarconGediminas Valkiūnas
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May 7, 2021·Parasitology International·Rafaela Venançoni MatosoMarta D'Agosto
Sep 25, 2021·Journal of Medical Primatology·Ayisa Rodrigues OliveiraRenato Lima Santos

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