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Solo Schistocephalus solidus tapeworms are nasty

Published online by Cambridge University Press:  25 May 2016

JARLE TRYTI NORDEIDE  and
FELIPE MATOS
JARLE TRYTI NORDEIDE*
Affiliation:
Faculty of Biosciences and Aquaculture, Nord University, NO-8026 Bodø, Norway
FELIPE MATOS
Affiliation:
Faculty of Biosciences and Aquaculture, Nord University, NO-8026 Bodø, Norway
*
*Corresponding author. Nord University, Universitetsalléen 1, NO-8026 Bodø, Norway. E-mail: jarle.t.nordeide@nord.no
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Summary

Trophically transmitted parasites must trade-off own growth on one hand and energy drain from the intermediate host on the other hand, since killing the host before transmission to the next host is a dead end for both parasites and hosts. This challenge becomes especially intriguing when multiple parasites find themselves within the same individual host. The tapeworm Schistocephalus solidus may gain more than 98% of its final body mass within few months infecting its three-spined stickleback (Gasterosteus aculeatus) intermediate host. During these months the tapeworms may achieve a mass even larger than its host. We studied virulence of single and multiple infections of S. solidus, by comparing body condition of wild stickleback hosts in two perennial stickleback populations located at high latitudes, and each population was studied in two different years. Our results demonstrated multiple compared with single infections to be a highly significant predictor of the condition of stickleback hosts, with multiple-infected hosts having relatively higher body condition. However, this applied only after adjusting for parasite mass, which was another significant predictor for host condition. Thus, our results suggested that, at a given parasite mass, S. solidus was more harmful towards their host's body condition in single compared with multiple infections.

Keywords

Schistocephalus solidusGasterosteus aculeatussticklebackmultiple infectionsparasite–host interactionsparasite cooperationvirulence
Type
Research Article
Information
Parasitology , Volume 143 , Issue 10 , September 2016 , pp. 1301 - 1309
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Copyright
Copyright © Cambridge University Press 2016 

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