Abstract AimMacroecological analyses provide valuable insights into factors that influence how parasites are distributed across space and among hosts. Amid large uncertainties that arise when generalizing from local and regional findings, hierarchical approaches applied to global datasets are required to determine whether drivers of parasite infection patterns vary across scales. We assessed global patterns of haemosporidian infections across a broad diversity of avian host clades and zoogeographical realms to depict hotspots of prevalence and to identify possible underlying drivers. LocationGlobal. Time period1994–2019. Major taxa studiedAvian haemosporidian parasites (generaPlasmodium,Haemoproteus,LeucocytozoonandParahaemoproteus). MethodsWe amalgamated infection data from 53,669 individual birds representing 2,445 species world‐wide. Spatio‐phylogenetic hierarchical Bayesian models were built to disentangle potential landscape, climatic and biotic drivers of infection probability while accounting for spatial context and avian host phylogenetic relationships. ResultsIdiosyncratic responses of the three most common haemosporidian genera to climate, habitat, host relatedness and host ecological traits indicated marked variation in host infection rates from local to global scales. Notably, host ecological drivers, such as migration distance forPlasmodiumandParahaemoproteus, exhibited predominantly varying or even opposite effects on infection rates across regions, whereas climatic effects on infection rates were more consistent across realms. Moreover, infections in some low‐prevalence realms were disproportionately concentrated in a few local hotspots, suggesting that regional‐scale variation in habitat and microclimate might influence transmission, in addition to global drivers. Main conclusionsOur hierarchical global analysis supports regional‐scale findings showing the synergistic effects of landscape, climate and host ecological traits on parasite transmission for a cosmopolitan and diverse group of avian parasites. Our results underscore the need to account for such interactions, in addition to possible variation in drivers across regions, to produce the robust inference required to predict changes in infection risk under future scenarios.
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Leucocytozoon cariamae n. sp. and Haemoproteus pulcher coinfection in Cariama cristata (Aves: Cariamiformes): first mitochondrial genome analysis and morphological description of a leucocytozoid in Brazil
Abstract The distribution of avian haemosporidians of the genusLeucocytozoonin the Neotropics remains poorly understood. Recent studies confirmed their presence in the region using molecular techniques alone, but evidence for gametocytes and data on putative competent hosts forLeucocytozoonare still lacking outside highland areas. We combined morphological and molecular data to characterize a newLeucocytozoonspecies infecting a non-migratory red-legged seriema (Cariama cristata), the first report of a competent host forLeucocytozoonin Brazil.Leucocytozoon cariamaen. sp. is distinguished from theLeucocytozoon fringillinarumgroup by its microgametocytes that are not strongly appressed to the host cell nucleus. The bird studied was coinfected withHaemoproteus pulcher, and we present a Bayesian phylogenetic analysis based on nearly complete mitochondrial genomes of these 2 parasites.Leucocytozoon cariamaen. sp. morphology is consistent with our phylogenetic analysis indicating that it does not share a recent common ancestor with theL.fringillinarumgroup.Haemoproteus pulcherandHaemoproteus cathartiform a monophyletic group withHaemocystidiumparasites of Reptilia, supporting the polyphyly of the genusHaemoproteus. We also discussed the hypothesis thatH. pulcherandH. cathartimay be avianHaemocystidium, highlighting the need to study non-passerine parasites to untangle the systematics of Haemosporida.
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- Award ID(s):
- 2146653
- PAR ID:
- 10507707
- Publisher / Repository:
- Parasitology
- Date Published:
- Journal Name:
- Parasitology
- ISSN:
- 0031-1820
- Page Range / eLocation ID:
- 1 to 11
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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