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Parasite transmission in a natural multihost-multiparasite community

Auld S, Searle C & Duffy M (2017) Parasite transmission in a natural multihost-multiparasite community, Philosophical Transactions B: Biological Sciences, 372 (1719), Art. No.: 20160097.

Understanding the transmission and dynamics of infectious diseases in natural communities requires understanding the extent to which the ecology, evolution and epidemiology of those diseases are shaped by alternative hosts. We performed laboratory experiments to test how parasite spillover affected traits associated with transmission in two co-occurring parasites: the bacterium Pasteuria ramosa and the fungus Metschnikowia bicuspidata. Both parasites were capable of transmission from the reservoir host (Daphnia dentifera) to the spillover host (Ceriodaphnia dubia), but this occurred at a much higher rate for the fungus than the bacterium. We quantified transmission potential by combining information on parasite transmission and growth rate, and used this to compare parasite fitness in the two host species. For both parasites, transmission potential was lower in the spillover host. For the bacterium, virulence was higher in the spillover host. Transmission back to the original host was high for both parasites, with spillover influencing transmission rate of the fungus but not the bacterium. Thus, whilst inferior, the spillover host is not a dead-end for either parasite. Overall, our results demonstrate that the presence of multiple hosts in a community can have important consequences for disease transmission and host and parasite fitness.

Host-parasite interactions; spillover; spillback; virulence evolution; epidemics

AuthorsAuld Stuart, Searle Catherine, Duffy Meghan
Publication date13/03/2017
Publication date online13/03/2017
Date accepted by journal08/07/2016
PublisherRoyal Society Publishing
ISSN 0962-8436

Philosophical Transactions b: Biological Sciences: Volume 372, Issue 1719

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