Loiseau C, Iezhova TA, Valkiūnas G, Chasar A, Hutchinson A, Buermann W, Smith TB, Sehgal RN
Spatial variation of haemosporidian parasite infection in African rainforest bird species. [JOURNAL ARTICLE]
J Parasitol 2009 Oct 27.:1.
Spatial heterogeneity influences the distribution, prevalence and diversity of haemosporidian parasites. Previous studies have found complex patterns of prevalence with respect to habitat characteristics and parasite genotype, and their interactions, but there is little information regarding how parasitemia intensity and the prevalence of co-infections may vary in space. Here, using both molecular methods and microscopy, we report an analysis of the variation of parasitemia intensity and co-infections of avian haemosporidian parasites (Plasmodium and Haemoproteus species) in 2 common African birds species, the yellow-whiskered greenbul (Andropadus latirostris) and the olive sunbird (Cyanomitra olivacea), at 3 sites with distinct habitat characteristics in Ghana. First, we found an interaction between the site and host species for the prevalence of Plasmodium spp. and Haemoproteus spp. For the olive sunbird, the prevalence of Plasmodium spp. as well as number of individuals with co-infections varied significantly among the sites, but these measures remained constant for the yellow-whiskered greenbul. In addition, yellow-whiskered greenbuls infected with Haemoproteus sp. were found only at 1 site. Furthermore, for both bird species, the parasitemia intensity of Plasmodium spp. varied significantly among the 3 sites but with opposing trends. These results suggest that spatial heterogeneity differently affects haemosporidian infection parameters in these vertebrate-hosts. Environmental conditions here can either favour or reduce parasite infection. We discuss the implications of these discrepancies for conservation and ecological studies of infectious diseases in natural population.
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