Linking morphometric and genetic divergence with host use in the tick complex, Ornithodoros capensis sensu lato

Dupraz Marlene, Toty Céline, Noel Valérie, Estrada-Pena Agustin, González-Solís Jacob, Boulinier Thierry, Dujardin Jean Pierre, McCoy Karen D.. 2016. Linking morphometric and genetic divergence with host use in the tick complex, Ornithodoros capensis sensu lato. Infection, Genetics and Evolution, 46 : pp. 12-22.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : INFECTIOUS DISEASES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Anthropologie-Ethnologie

Abstract : Host specific adaptations in parasites can lead to the divergence of conspecific populations. However, this divergence can be difficult to measure because morphological changes may not be expressed or because obvious changes may simply reflect phenotypic plasticity. Combining both genetic and phenotypic information can enable a better understanding of the divergence process and help identify the underlying selective forces, particularly in closely-related species groups. Here, we link genetic and morphometric data to understand divergence patterns within the Ornithodoros (Carios) capensis complex, a group of soft ticks (Argasidae) exploiting colonial seabirds across the globe. Species designations in this complex were historically based on larval morphology and geographic location. However, recent work has suggested that divergence within the group may be at least partially linked to host specificity. We therefore first examined population genetic structure of ticks in relation to host use and geography. These analyses revealed strong structure in relation to host use, both when populations were sympatric and widely allopatric, with a secondary effect of geography. They also demonstrated the presence of several novel and presumably undescribed species exploiting these seabird hosts. We then used geometric morphometrics (landmark and outline analyses) to test whether host-associated genetic divergence is always accompanied by the same phenotypic changes. We found that morphological variation (size and shape) correlated well with genetic structure; tick size and shape varied strongly in relation to host type, and weakly with geography. These results support the hypothesis that speciation in this tick group has been more strongly shaped by host use than by geographic barriers per se. The revealed phenetic patterns now require detailed investigation to link them with host-specific selective forces.

Mots-clés Agrovoc : Vecteur de maladie, Divergence génétique, Ornithodoros, Acarien nuisible, Argasidae, Génétique des populations, Adaptation, Parasite, morphologie, Anatomie animale, Identification, oiseau marin

Mots-clés géographiques Agrovoc : Océan atlantique, océan Indien, Océan pacifique, Mer Méditerranée, Cabo Verde, Canaries (îles), Pérou, France, Hawaï, Texas, Mexique, Japon

Mots-clés complémentaires : Ornithodoros capensis, morphométrie

Mots-clés libres : Adaptation, Host specificity, Population genetic structure, Morphometry, Ectoparasite, Tropical seabirds

Classification Agris : L72 - Pests of animals
L40 - Animal structure

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Dupraz Marlene, CIRAD-BIOS-UMR CMAEE (FRA) - auteur correspondant
  • Toty Céline, CNRS (FRA)
  • Noel Valérie, IRD (FRA)
  • Estrada-Pena Agustin, University of Zaragoza (ESP)
  • González-Solís Jacob, Universitat de Barcelona (ESP)
  • Boulinier Thierry, CNRS (FRA)
  • Dujardin Jean Pierre, IRD (FRA)
  • McCoy Karen D., IRD (FRA)

Source : Cirad-Agritrop (

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