期刊
PARASITOLOGY INTERNATIONAL
卷 80, 期 -, 页码 -出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.parint.2020.102204
关键词
Anthropogenic change; Disease ecology; Haemoproteus (Parahaemoproteus); Parasite diversity; Plasmodium; Urban ecology
类别
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais -FAPEMIG
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico -CNPq [406911/2013-4, 308678/2018-4]
- National Science Foundation as part of the joint NSF-NIH-USDA Ecology and Evolution of Infectious Diseases program [1717498]
- PNPD scholarship from Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -CAPES [88887.342366/2019-00]
- University of Otago
- Centro Universitario de Brasilia -UniCEUB
This study examined the infection rates and diversity of avian haemosporidian parasites in Blue-black Grassquit populations, finding that vegetation cover influenced prevalence. Populations inhabiting sites with higher proportion of native vegetation cover were more likely to be infected.
Human induced changes on landscape can alter the biotic and abiotic factors that influence the transmission of vector-borne parasites. To examine how infection rates of vector-transmitted parasites respond to changes on natural landscapes, we captured 330 Blue-black Grassquits (Volatinia jacarina) in Brazilian biomes and assessed the prevalence and diversity of avian haemosporidian parasites (Plasmodium and Haemoproteus) across avian host populations inhabiting environment under different disturbance and climatic conditions. Overall prevalence in Blue-black Grassquits was low (11%) and infection rates exhibited considerable spatial variation, ranging from zero to 39%. Based on genetic divergence of cytochrome b gene, we found two lineages of Haemoproteus (Parahaemoproteus) and 10 of Plasmodium. We showed that Blue-black Grassquit populations inhabiting sites with higher proportion of native vegetation cover were more infected across Brazil. Other landscape metrics (number of water bodies and distance to urban areas) and climatic condition (temperature and precipitation) known to influence vector activity and promote avian malaria transmission did not explain infection probability in Blue-black Grassquit populations. Moreover, breeding season did not explain prevalence across avian host populations. Our findings suggest that avian haemosporidian prevalence and diversity in Blue-black Grassquit populations are determined by recent anthropogenic changes in vegetation cover that may alter microclimate, thus influencing vector activity and parasite transmission.
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