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Ligula intestinalis (Cestoda: Diphyllobothriidae) in Kenya: a field investigation into host specificity and behavioural alterations

Published online by Cambridge University Press:  23 July 2009

J. R. BRITTON*
Affiliation:
Centre for Conservation Ecology & Environmental Change, School of Conservation Sciences, Bournemouth University, Poole, Dorset BH12 5BB, UK
M. C. JACKSON
Affiliation:
School of Biological & Chemical Sciences, Queen Mary, University of London, Mile End Rd, London E1 4NS, UK
D. M. HARPER
Affiliation:
Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, UK
*
*Corresponding author: Centre for Conservation Ecology, School of Conservation Sciences, Bournemouth University, Poole, Dorset, BH12 5BB, UK. Tel: +44 (0)120 2965384. E-mail: Rbritton@bournemouth.ac.uk.

Summary

Within the distribution of Ligula intestinalis, a tapeworm affecting freshwater fishes, there are genetically distinct and well-separated phylogenetic clusters. East Africa is represented by a single monophyletic clade which is understudied compared with Euro-Mediterranean clades. The present field investigation in the Lake Baringo and Naivasha catchments, Kenya, revealed that this L. intestinalis clade was highly host-specific, present in only 2 of 12 fishes examined; Barbus paludinosus in Naivasha and Barbus lineomaculatus in Baringo. In infected fish, cestodes comprised up to 20% of body weight. Only 1 parasite was recorded per fish, a contrast to infected fishes in Europe where mixed infections are commonplace. In B. lineomaculatus in Baringo, only fish of greater than 64 mm in length were parasitized. The highest parasite prevalence was recorded in fish of 70–77 mm in length, and reduced for lengths of 78–84 mm. Parasitized fish were significantly associated with a particular type of habitat, occurring most frequently in shallow littoral areas, and being absent from open water and rocky shore habitats. Uninfected fish were present in all habitats. This relationship between spatial occupancy and parasite prevalence is suggested to arise from behavioural alterations induced by the parasite that promotes completion of the parasite life cycle.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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