Quality matters: resource quality for hosts and the timing of epidemics.

Abstract:

:Epidemiologists increasingly realize that species interactions (e.g. selective predation) can determine when epidemics start and end. We hypothesize here that resource quality can also strongly influence disease dynamics: epidemics can be inhibited when resource quality for hosts is too poor and too good. In three lakes, resource quality for the zooplankton host (Daphnia dentifera) was poor when fungal epidemics (Metschnikowia bicuspidata) commenced and increased as epidemics waned. Experiments using variation in algal food showed that resource quality had conflicting effects on underlying epidemiology: high-quality food induced large production of infective propagules (spores) and high birth rate but also reduced transmission. A model then illustrated how these underlying correlations can inhibit the start of epidemics (when spore production/birth rate are too low) but also catalyse their end (when transmission becomes too low). This resource quality mechanism is likely to interface with other ones controlling disease dynamics and warrants closer evaluation.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Hall SR,Knight CJ,Becker CR,Duffy MA,Tessier AJ,Cáceres CE

doi

10.1111/j.1461-0248.2008.01264.x

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

118-28

issue

2

eissn

1461-023X

issn

1461-0248

pii

ELE1264

journal_volume

12

pub_type

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