Artificial light at night amplifies seasonal relapse of haemosporidian parasites in a widespread songbird

Daniel Becker, Devraj Singh, Qiuyun Pan, Jesse Montoure, Katherine Talbott, Sarah Wanamaker & Ellen Ketterson
Urban habitats can shape interactions between hosts and parasites by altering within-host processes such as resistance. Artificial light at night is common in urban environments, and chronic exposure can impair host immunity in ways that may increase infection. However, studies of causal links between this stressor, immunity, and infection dynamics are rare, particularly in migratory animals. Here, we experimentally tested how artificial light at night affects cellular immunity and intensity of infection with haemosporidian parasites...
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