Roiz David auteur aut IRD Vazquez A. auteur aut IRD Ruiz S. auteur aut IRD Tenorio A. auteur aut IRD Soriguer R. auteur aut IRD Figuerola J. auteur aut IRD text journalArticle eng text/pdf born digital access Environment determines the distribution and prevalence of vector-borne pathogens due to its direct and indirect effects on the hosts, vectors, and pathogens. To investigate the relationship between Usutu virus occurrence and host biodiversity and to characterize the nidus of infection, we used field-based measures of host diversity and density (all birds and only passerines), vector abundance, landscape and Usutu virus prevalence (mosquito infection rate), an emergent disease with a similar cycle to West Nile virus. We collected 908,237 female mosquitoes in an area of 54,984 ha in the Donana National Park, southern Spain. We identified the mosquitoes and screened them for viruses, censused birds, characterized landscape and climatic variables, and then modeled the presence and infection rate of the virus in relation to host, vector, climatic, and landscape variables. Monthly Usutu presence, detected in Culex perexiguus, was positively related to Passeriformes richness and secondarily to NDVI in the previous month. Our results suggest that Usutu prevalence may be higher when and where host (passerine) richness was high, and thus challenging the conventional idea that host biodiversity reduces flavivirus amplification. specialized Biodiversity Disease ecology Mosquito-borne virus Dilution effect Amplification effect Usutu ESPAGNE 052 080 16 4 734-742 2019 1612-9202 https://www.documentation.ird.fr/hor/fdi:010077142 10.1007/s10393-019-01441-3 1612-9202 [F B010077142] https://www.documentation.ird.fr/hor/fdi:010077142 https://www.documentation.ird.fr/intranet/publi/depot/2020-10-22/010077142.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2019-12-12 2025-02-24 fdi:010077142 fre