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Worms at war: interspecific parasite competition and host resources alter trematode colony structure and fitness

Published online by Cambridge University Press:  27 June 2017

KIM N. MOURITSEN Open the ORCID record for KIM N. MOURITSEN [Opens in a new window]  and
CECILLIE ANDERSEN
KIM N. MOURITSEN*
Affiliation:
Department of Bioscience, Aquatic Biology, Aarhus University, Ole Worms Allé 1, DK-8000 Aarhus C, Denmark
CECILLIE ANDERSEN
Affiliation:
Department of Bioscience, Aquatic Biology, Aarhus University, Ole Worms Allé 1, DK-8000 Aarhus C, Denmark
*
*Corresponding author: Department of Bioscience, Aquatic Biology, Aarhus University, Ole Worms Allé 1, DK-8000 Aarhus C, Denmark. E-mail: [email protected]
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Summary

Parasites competing over limited host resources are faced with a tradeoff between reproductive success and host overexploitation jeopardizing survival. Surprisingly little is known about the outcome of such competitive scenarios, and we therefore aimed at elucidating interactions between the trematodes Himasthla elongata and Renicola roscovita coinfecting the periwinkle first intermediate host. The results show that the success of Himasthla colonies (rediae) in terms of cercarial emission is unaffected by Renicola competition (sporocysts), whereas deteriating host condition decreases fitness. Furthermore, double infection has no bearing on Himasthla’s colony size but elevated the proportion of non-reproductive rediae that play a decisive role in colony defence. Opposite, the development of the Renicola colony (size/maturity), and in turn fitness, is markedly reduced in presence of Himasthla, whereas the nutritional state of the host appears less important. Hence, the intramolluscan competition between Himasthla and Renicola is asymmetrical, Himasthla being the superior competitor. Himasthla not only adjusts its virulence according to the hosts immediate nutritional state, it also nullifies the negative impact of a heterospecific competitor on own fitness. The latter is argued to follow in part from direct predation on the competitor, for which purpose more defensive non-reproductive rediae are strategically produced.

Keywords

caste ratiocercarial productioncolony successexploitative competitionHimasthla elongatahost starvationLittorina littoreaparthenitae demographyRenicola roscovitatrematode antagonism
Type
Research Article
Information
Parasitology , Volume 144 , Issue 11 , September 2017 , pp. 1530 - 1542
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Copyright
Copyright © Cambridge University Press 2017 

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