Can the intake of antiparasitic secondary metabolites explain the low prevalence of hemoparasites among wild Psittaciformes?

Juan F. Masello, Javier Martínez, Luciano Calderón, Michael Wink, Petra Quillfeldt, Virginia Sanz, Jörn Theuerkauf, Luis Ortiz-Catedral, Igor Berkunsky, Dianne Brunton, José A. Díaz-Luque, Mark E. Hauber, Valeria Ojeda, Antoine Barnaud, Laura Casalins, Bethany Jackson, Alfredo Mijares, Romel Rosales, Gláucia Seixas, Patricia SerafiniAdriana Silva-Iturriza, Elenise Sipinski, Rodrigo A. Vásquez, Peter Widmann, Indira Widmann, Santiago Merino

Research output: Contribution to journalArticlepeer-review


Background: Parasites can exert selection pressure on their hosts through effects on survival, on reproductive success, on sexually selected ornament, with important ecological and evolutionary consequences, such as changes in population viability. Consequently, hemoparasites have become the focus of recent avian studies. Infection varies significantly among taxa. Various factors might explain the differences in infection among taxa, including habitat, climate, host density, the presence of vectors, life history and immune defence. Feeding behaviour can also be relevant both through increased exposure to vectors and consumption of secondary metabolites with preventative or therapeutic effects that can reduce parasite load. However, the latter has been little investigated. Psittaciformes (parrots and cockatoos) are a good model to investigate these topics, as they are known to use biological control against ectoparasites and to feed on toxic food. We investigated the presence of avian malaria parasites (Plasmodium), intracellular haemosporidians (Haemoproteus, Leucocytozoon), unicellular flagellate protozoans (Trypanosoma) and microfilariae in 19 Psittaciformes species from a range of habitats in the Indo-Malayan, Australasian and Neotropical regions. We gathered additional data on hemoparasites in wild Psittaciformes from the literature. We considered factors that may control the presence of hemoparasites in the Psittaciformes, compiling information on diet, habitat, and climate. Furthermore, we investigated the role of diet in providing antiparasitic secondary metabolites that could be used as self-medication to reduce parasite load. Results: We found hemoparasites in only two of 19 species sampled. Among them, all species that consume at least one food item known for its secondary metabolites with antimalarial, trypanocidal or general antiparasitic properties, were free from hemoparasites. In contrast, the infected parrots do not consume food items with antimalarial or even general antiparasitic properties. We found that the two infected species in this study consumed omnivorous diets. When we combined our data with data from studies previously investigating blood parasites in wild parrots, the positive relationship between omnivorous diets and hemoparasite infestation was confirmed. Individuals from open habitats were less infected than those from forests. Conclusions: The consumption of food items known for their secondary metabolites with antimalarial, trypanocidal or general antiparasitic properties, as well as the higher proportion of infected species among omnivorous parrots, could explain the low prevalence of hemoparasites reported in many vertebrates.

Original languageEnglish (US)
Article number357
JournalParasites and Vectors
Issue number1
StatePublished - Jun 19 2018


  • Antiparasitic metabolites
  • Blood parasites
  • Cacatuidae
  • Haemoparasites
  • Herbivorous
  • Omnivorous
  • Plant secondary metabolites
  • Psittacidae
  • Self-medication

ASJC Scopus subject areas

  • Infectious Diseases
  • General Veterinary
  • Parasitology


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