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Ecological impacts of the microsporidian parasite Pleistophora mulleri on its freshwater amphipod host Gammarus duebeni celticus

Published online by Cambridge University Press:  10 June 2005

N. J. FIELDING ,
C. MacNEIL ,
N. ROBINSON ,
J. T. A. DICK ,
R. W. ELWOOD ,
R. S. TERRY ,
Z. RUIZ  and
A. M. DUNN
N. J. FIELDING
Affiliation:
School of Biology and Biochemistry, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland, UK
C. MacNEIL
Affiliation:
School of Biology and Biochemistry, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland, UK
N. ROBINSON
Affiliation:
School of Biology and Biochemistry, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland, UK
J. T. A. DICK
Affiliation:
School of Biology and Biochemistry, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland, UK
R. W. ELWOOD
Affiliation:
School of Biology and Biochemistry, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, N. Ireland, UK
R. S. TERRY
Affiliation:
Centre for Biodiversity and Conservation, School of Biology, University of Leeds, Leeds LS2 9JT, UK
Z. RUIZ
Affiliation:
Department of Geography, University of Exeter, Amory Building, Rennes Drive, Exeter EX4 4RJ, UK
A. M. DUNN
Affiliation:
Centre for Biodiversity and Conservation, School of Biology, University of Leeds, Leeds LS2 9JT, UK
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Abstract

The microsporidian parasite, Pleistophora mulleri, infects the abdominal muscle of the freshwater amphipod Gammarus duebeni celticus. We recently showed that P. mulleri infection was associated with G. d. celticus hosts being more vulnerable to predation by the invasive amphipod Gammarus pulex. Parasitized G. d. celticus also had a reduced ability to prey upon other co-occurring amphipods. We suggested the parasite may have pervasive influences on host ecology and behaviour. Here, we examine the association between P. mulleri parasitism and parameters influencing individual host fitness, behaviour and interspecific interactions. We also investigate the relationship between parasite prevalence and host population structure in the field. In our G. d. celticus study population, P. mulleri prevalence was strongly seasonal, ranging from 8·5% in summer to 44·9% in winter. The relative abundance of hosts with the heaviest parasite burden increased during summer, which coincided with high host mortality, suggesting that parasitism may regulate host abundance to some degree. Females were more likely to be parasitized than males and parasitized males were paired with smaller females than unparasitized males. Parasitism was associated with reduction in the host's activity level and reduced both its predation on the isopod Asellus aquaticus and aggression towards precopula pairs of the invasive G. pulex. We discuss the pervasive influence of this parasite on the ecology of its host.

Keywords

AmphipodGammarusisopodmicrosporidianPleistophora mulleritrophic
Type
Research Article
Information
Parasitology , Volume 131 , Issue 3 , September 2005 , pp. 331 - 336
Copyright
© 2005 Cambridge University Press

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