European Journal of Wildlife Research

, Volume 57, Issue 2, pp 275–281 | Cite as

Determinants of the prevalence of the cloacal cestode Cloacotaenia megalops in teal wintering in the French Camargue

  • Andy J. GreenEmail author
  • Boyko B. Georgiev
  • Anne-Laure Brochet
  • Michel Gauthier-Clerc
  • Hervé Fritz
  • Matthieu Guillemain
Original Paper


Eurasian teal Anas crecca (n = 46,581) were inspected during ringing operations for the presence of the hymenolepidid cloacal cestode Cloacotaenia megalops between 1954 and 1971 while wintering in the Camargue, Southern France. These birds become infected when ingesting seed shrimps (Ostracoda) that act as intermediate hosts, largely while on migration across Western Europe. The prevalence ranged from 4% to 14% per year and increased significantly over time. This long-term trend was further supported by studying 366 teal shot in 2006–2008, for which prevalence of C. megalops was 27.6%. We found no evidence to suggest that this increase in prevalence has been caused by an increase in temperature, but eutrophication and an increase in duck densities are potential contributing factors. Adult teal were more likely to be infected than first-year birds and females more so than males, probably due to differences in diet and/or habitat use. Within a given age−sex class, heavier birds were more infected than lighter ones, suggesting low pathogenicity and a causal effect of ingestion rate. Within a year, the highest prevalence was observed in mid-winter.


Cloacotaenia Ducks Helminths Long-term trends in parasite prevalence Ostracods Waterfowl 



We are grateful to Luc Hoffmann, Hubert Kowalski, Heinz Hafner, Alan Johnson, and others who ringed teal at the Tour du Valat over 25 years. Marc Lutz, Paul Isenmann, and the Centre de Recherche sur la Biologie des Populations d’Oiseaux (Muséum National d’Histoire Naturelle, Paris) helped to computerize the ringing database. Mr Cordesse, Herbinger, Rayssac, Grossi, Lecat, and Arnihac and members of the Tour du Valat hunting group allowed us to sample freshly shot birds. We also thank J.-B. Mouronval and J. Fuster for help sampling digestive tracts, P. Almaraz for help locating temperature data, and anonymous referees for improving the manuscript. A.-L. Brochet was funded by a Doctoral grant from Office National de la Chasse et de la Faune Sauvage, with additional funding from a research agreement between ONCFS, the Tour du Valat, Laboratoire de Biométrie et de Biologie Evolutive (UMR 5558 CNRS Université Lyon 1), and the Doñana Biological Station (CSIC). This work also received funding from the Agence Nationale de la Recherche through the Santé Environnement - Santé Travail scheme (contract number 2006-SEST-22).


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Andy J. Green
    • 1
    Email author
  • Boyko B. Georgiev
    • 2
    • 3
  • Anne-Laure Brochet
    • 4
    • 5
  • Michel Gauthier-Clerc
    • 5
  • Hervé Fritz
    • 6
  • Matthieu Guillemain
    • 4
  1. 1.Department of Wetland EcologyEstación Biológica de Doñana-CSICSevillaSpain
  2. 2.Central Laboratory of General EcologyBulgarian Academy of SciencesSofiaBulgaria
  3. 3.Department of ZoologyNatural History MuseumLondonUK
  4. 4.Office National de la Chasse et de la Faune SauvageCNERA Avifaune MigratriceArlesFrance
  5. 5.Centre de Recherche de La Tour du ValatArlesFrance
  6. 6.CNRS UMR 5558 Biométrie et Biologie EvolutiveUniversité Claude Bernard Lyon 1Villeurbanne cedexFrance

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