Context-dependent effects of parental effort on malaria infection in a wild bird population, and their role in reproductive trade-offs.

Oecologia
S C L KnowlesB C Sheldon

Abstract

Although trade-offs between reproductive effort and other fitness components are frequently documented in wild populations, the underlying physiological mechanisms remain poorly understood. Parasitism has been suggested to mediate reproductive trade-offs, yet only a limited number of parasite taxa have been studied, and reproductive effort-induced changes in parasitism are rarely linked to trade-offs observed in the same population. We conducted a brood size manipulation experiment in blue tits (Cyanistes caeruleus) infected with malaria (Plasmodium) parasites, and used quantitative PCR to measure changes in parasitaemia. In one of two years investigated, parasitaemia increased as a result of brood enlargement, and was also positively associated with two other indicators of reproductive effort: clutch size and single parenthood. These associations between both experimental and naturally varying reproductive effort and parasitaemia suggest that immune control of chronic malaria infections can be compromised when parents are working hard. Brood size manipulation significantly affected the number of independent offspring produced, which was maximised when brood size was unchanged. Moreover, when parents were infected with one of t...Continue Reading

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Citations

May 31, 2014·PLoS Pathogens·Laura F GroganLee F Skerratt
Feb 11, 2012·Annals of the New York Academy of Sciences·Dennis A LapointeMichael D Samuel
Jul 27, 2012·Journal of Evolutionary Biology·E S A Santos, S Nakagawa
Sep 21, 2016·Parasitology·Letícia SoaresRobert E Ricklefs
Sep 9, 2017·The Journal of Animal Ecology·Laura A SchoenleIgnacio T Moore
Dec 24, 2014·Ecology and Evolution·Hanna M V Granroth-WildingEmma J A Cunningham
Dec 5, 2013·Evolution; International Journal of Organic Evolution·Colin J GarrowayBen C Sheldon
Dec 29, 2017·Parasitology Research·Jamie D SmithMaarten J Vonhof
Nov 16, 2010·Molecular Ecology·Sarah C L KnowlesBen C Sheldon
Mar 10, 2021·Parasites & Vectors·Marina D RodriguezKathryn P Huyvaert
Oct 4, 2014·The Journal of Experimental Biology·Paulina A SzafrańskaMarek Konarzewski
Aug 28, 2021·International Journal for Parasitology·Simone MessinaDavid Costantini

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