Plasticity of predation behaviour as a putative driving force for parasite life-cycle dynamics: the case of urban foxes and Echinococcus multilocularis tapeworm

• Published in: Functional ecology 2007-06, Vol.21 (3), p.552-560
• Main Authors: HEGGLIN, D, BONTADINA, F, CONTESSE, P, GLOOR, S, DEPLAZES, P
• Format: Article
• Language: English
• Subjects: alveolar echinococcosis; Animal and plant ecology; Animal, plant and microbial ecology; Arvicola terrestris; Autoecology; Behavioural Ecology; Biological and medical sciences; Echinococcus multilocularis; fox diet; Foxes; Fundamental and applied biological sciences. Psychology; General aspects; Human ecology; intermediate host; Intermediate hosts; Medically important nuisances and vectors, pests of stored products and materials: population survey and control; Parasite hosts; parasite transmission; Parasites; Predation; prey-predator interplay; Rodents; Stomach; Urban ecology; Vectors. Intermediate hosts; Voles; Vulpes vulpes
• ISSN: 0269-8463; 1365-2435
• DOI: 10.1111/j.1365-2435.2007.01257.x

1. Parasite transmission frequently depends on an intermediate host species being subject to predation by a definitive host. We hypothesized that the population dynamics of this type of parasite would be affected by plasticity of the predation behaviour of the final host. 2. The zoonotic tapeworm Echinococcus multilocularis Leuckart is transmitted to foxes (Vulpes vulpes L.) by predation on infected rodents. One possible mechanism underlying the significant decrease in the prevalence of E. multilocularis in red foxes observed towards the centre of Zurich (Switzerland) is that the relative abundance of intermediate hosts varies between different urbanized habitats. 3. The water vole, Arvicola terrestris scherman L., which is the major intermediate host, was less abundant in urban compared with peri-urban areas, due to both a reduced availability of suitable habitats and lower numbers within those habitats. Stomach content analyses indicated that foxes in urban areas consumed more anthropogenic food but preyed less frequently on rodents - and those rodents taken belonged to species less susceptible to E. multilocularis infection. 4. We conclude that the functional response of final hosts to changes in supply of intermediate hosts and alternative food sources can significantly affect the transmission dynamic of dixenous parasites, such as this zoonotic tapeworm.