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1 March 2006 MULTIPLE INFECTIONS: RELATEDNESS AND TIME BETWEEN INFECTIONS AFFECT THE ESTABLISHMENT AND GROWTH OF THE CESTODE SCHISTOCEPHALUS SOLIDUS IN ITS STICKLEBACK HOST
Ilonka Jäger, Solveig Schjørring
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Abstract

We studied experimental double infections of the cestode Schistocephalus solidus in its stickleback host. In particular, we were interested in how two important components of the cestode's transmission success—establishment and growth within the fish host—were affected by the relatedness of the two parasites in a double exposure and by the timing of the two exposures, that is, whether they occurred simultaneously or sequentially. We found that male sticklebacks more often became infected (singly or doubly) if the two cestodes in the exposures were related, whereas female sticklebacks were more easily infected (singly or doubly) when exposed to two unrelated cestodes. Irrespective of the fish's gender, successful infections more often contained both cestodes when they were related. In sequential exposures with related as well as unrelated cestodes, the cestode in the later exposure survived better and also grew larger than the cestode from the first exposure, despite being one week younger. Our results emphasize that within-host dynamics and factors acting at this level can play an important role in determining a parasite's transmission success.

Ilonka Jäger and Solveig Schjørring "MULTIPLE INFECTIONS: RELATEDNESS AND TIME BETWEEN INFECTIONS AFFECT THE ESTABLISHMENT AND GROWTH OF THE CESTODE SCHISTOCEPHALUS SOLIDUS IN ITS STICKLEBACK HOST," Evolution 60(3), 616-622, (1 March 2006). https://doi.org/10.1554/05-450.1
Received: 8 August 2005; Accepted: 6 January 2006; Published: 1 March 2006
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KEYWORDS
Gasterosteus aculeatus
multiple infection
parasite transmission
relatedness of parasites
Schistocephalus solidus
simultaneous and sequential infection
within-host dynamics
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