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dc.contributor.advisor-, -
dc.contributor.authorIannacone, José
dc.descriptionParasites are globally widespread pathogenic organisms, which impose important selective forces upon their hosts. Thus, in accordance with the Adjustment to parasite pressure hypothesis, it is expected that defenses among hosts vary relative to the selective pressure imposed by parasites. According to the latitudinal gradient in diversity, species richness and abundance of parasites peak near the equator. The uropygial gland is an important defensive exocrine gland against pathogens in birds. Size of the uropygial gland has been proposed to vary among species of birds because of divergent selection by pathogens on their hosts. Therefore, we should expect that bird species from the tropics should have relatively larger uropygial glands for their body size than species from higher latitudes. However, this hypothesis has not yet been explored. Here, we analyze the size of the uropygial gland of 1719 individual birds belonging to 36 bird species from 3 Neotropical (Peru) and 3 temperate areas (Spain). Relative uropygial gland volume was 12.52% larger in bird species from the tropics than from temperate areas. This finding is consistent with the relative size of this defensive organ being driven by selective pressures imposed by parasites. We also explored the potential role of this gland as a means of avoiding haemosporidian infection, showing that spe- cies with large uropygial glands for their body size tend to have lower mean prevalence of haemo- sporidian infection, regardless of their geographical origin. This result provides additional support for the assumption that secretions from the uropygial gland reduce the likelihood of becoming infected with haemosporidians.es_ES
dc.description.uriTrabado de investigaciones_ES
dc.publisherUniversidad Ricardo Palmaes_ES
dc.sourceUniversidad Ricardo Palmaes_ES
dc.sourceRepositorio institucional - URPes_ES
dc.subjecthaemosporidian infectiones_ES
dc.titleExploring the adjustment to parasite pressure hypothesis: differences in uropygial gland volume and haemosporidian infection in palearctic and neotropical birdses_ES
dc.typeinfo:eu-repo/semantics/articlees_ESíaes_ES Ricardo Palma. Facultad de Biologíaes_ESíaes_ES

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