Show simple item record

Files in this item


Item metadata

dc.contributor.authorNwaogu, Chima Josiah
dc.contributor.authorCresswell, Will
dc.contributor.authorTieleman, Irene
dc.identifier.citationNwaogu , C J , Cresswell , W & Tieleman , I 2020 , ' Geographic variation in baseline innate immune function does not follow variation in aridity along a tropical environmental gradient ' , Scientific Reports , vol. 10 , 5909 .
dc.identifier.otherPURE: 266933003
dc.identifier.otherPURE UUID: a97f0fcb-a203-4653-a976-0b06effc7cd1
dc.identifier.otherORCID: /0000-0002-4684-7624/work/71954862
dc.identifier.otherScopus: 85083041074
dc.descriptionC.J.N. was supported by a studentship funded by the Leventis Conservation Foundation through the University of St. Andrews, UK and an Ubbo Emmius grant of the University of Groningen. B.I.T. was supported by the Netherlands Organisation for Scientific Research (NWO-Vidi 864.10.012). This is publication number 141 of the A.P. Leventis Ornithological Research Institute, Nigeria and chapter 7 of the thesis ‘Avian life in a seasonally arid tropical environment: adaptations and mechanisms in breeding, molt and immune function’91, submitted for the award of a doctorate degree by the University of Groningen, the Netherlands and University of St. Andrews, UK.en
dc.description.abstractGeographic variation in aridity determines environmental productivity patterns, including large-scale variability in pathogens, vectors and associated diseases. If disease risk decreases with increasing aridity and is matched by immune defense, we predict a decrease in innate immune function along a gradient of increasing aridity from the cool-wet forest to the hot-dry Sahel, from south to north in Nigeria. We sampled blood and measured five innate immune indices from 286 Common Bulbuls Pycnonotus barbatus between 6 and 13°N. We sampled in the dry season; we resampled the first location (Jos) also as the last sample location to test temporal change in immune function. Immune indices did not decrease with aridity. One immune index, nitric oxide concentration showed a weak quadratic pattern. In Jos, ovotransferrin concentration, haemagglutination and haemolysis titres increased 12 weeks into the dry season, contrary to expectations that immune indices should decrease with increased dryness. In this tropical system, innate immune function does not decrease with increasing aridity but temporal factors within a location may influence immune function more strongly than spatial variation in aridity, suggesting that immune variation does not follow a simple environmental productivity pattern. Consequently, caution should probably be exercised in predicting effects of climate variability on immune function or disease risk.
dc.relation.ispartofScientific Reportsen
dc.rightsCopyright © The Author(s) 2020. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
dc.subjectQH301 Biologyen
dc.titleGeographic variation in baseline innate immune function does not follow variation in aridity along a tropical environmental gradienten
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.contributor.institutionUniversity of St Andrews.Centre for Biological Diversityen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Sustainability Instituteen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record