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Low haemosporidian diversity and one key-host species in a bird malaria community on a mid-atlantic island (sao miguel, azores)

  • Olof Hellgren
  • Asta Krizanauskiene
  • Dennis Hasselquist
  • Staffan Bensch
Publishing year: 2011
Language: English
Pages: 849-859
Publication/Series: Journal of Wildlife Diseases
Volume: 47
Issue: 4
Document type: Journal article
Publisher: Wildlife Disease Association

Abstract english

When host species colonize new areas, the parasite assemblage infecting the hosts might change, with some parasite species being lost and others newly acquired. These changes would likely lead to novel selective forces on both host and its parasites. We investigated the avian blood parasites in the passerine bird community on the mid-Atlantic island of Sao Miguel, Azores, a bird community originating from continental Europe. The presence of haemosporidian blood parasites belonging to the genera Haemoproteus, Plasmodium, and Leucocytozoon was assessed using polymerase chain reaction. We found two Plasmodium lineages and two Leucocytozoon lineages in 11 bird species (84% of all breeding passerine species) on the island. These line ages were unevenly distributed across bird species. The Eurasian Blackbird (Turdus merula) was the key-host species (total parasite prevalence of 57%), harboring the main proportion of parasite infections. Except for Eurasian Blackbirds, all bird species had significantly lower prevalence and parasite diversity compared to their continental populations. We propose that in evolutionary novel bird communities, single species may act as key hosts by harboring the main part of the parasite fauna from which parasites "leak" into the other species. This would create very different host parasite associations in areas recently colonized by hosts as compared to in their source populations.


  • Biological Sciences
  • Azores
  • Haemoproteus
  • key host
  • Leucocytozoon
  • Plasmodium
  • prevalence


  • Malaria in birds
  • Centre for Animal Movement Research
  • Molecular Ecology and Evolution Lab
  • ISSN: 0090-3558
Dennis Hasselquist
E-mail: dennis [dot] hasselquist [at] biol [dot] lu [dot] se



+46 46 222 37 08



Research group


Doctoral students and postdocs

Research fellows


Jacob Roved

PhD Students, main supervisor

PhD Students, assistant supervisor


Interview about my research in the Swedish podcast "Forskarn & jag"