Abstract
Parasites are undoubtedly a biotic factor that produces stress. Heat shock proteins (HSPs) are important molecules buffering cellular damage under adverse conditions. During the breeding season, blue tit Cyanistes caeruleus (L.) adults are affected by blood parasites, nest-dwelling parasites and biting flies, potentially affecting their HSP-mediated responses. Here, we treated females with primaquine to reduce blood parasites and fumigated nests with permethrin to reduce nest-dwelling parasites to test whether these treatments affect HSP60 level during the breeding season. Medicated females, but not controls, had a significant reduction of the intensity of infection by Haemoproteus spp. blood parasites. However, final intensity of infection did not differ significantly between groups, and we did not find an effect of medication on change in HSP60 level. Fumigation reduced the abundance of nest-dwelling parasites (mites, fleas and blowfly larvae) and engorged biting midges in nests. Females breeding in non-fumigated nests increased HSP60 levels during the season more than those breeding in fumigated nests. Furthermore, the change in HSP60 level was positively correlated with the abundance of biting midges. These results show how infections by nest ectoparasites during the breeding period can increase the level of HSPs and suggest that biting midges impose physiological costs on breeding female blue tits. Although plausible, the alternative that biting midges prefer to feed on more stressed birds is poorly supported by previous studies.
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Acknowledgements
This study was funded by different projects CGL2006-14129-C02-01, CGL2007-61251 and CGL2009-09439 from Ministerio de Educación y Ciencia. The Junta de Castilla y León authorised the ringing and handling of birds. We thank Javier Donés (Director of “Montes de Valsaín”) for permission to work in the study area. The authors thank Sonia Aracil for their invaluable help in the lab. J.M.-P. is supported by a postdoctoral grant from Universidad de Las Palmas de Gran Canaria; J. Morales and G. Tomás are supported by Juan de la Cierva fellowships and E. Lobato by a Postdoctoral contract (Ministerio de Ciencia e Innovación). A.V. Bordería kindly supplied the Petri dishes. This study is a contribution to the research developed at “El Ventorrillo” field station. Three anonymous referees considerably improved a previous version of the manuscript with their constructive comments.
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Martínez-de la Puente, J., Merino, S., Tomás, G. et al. Nest ectoparasites increase physiological stress in breeding birds: an experiment. Naturwissenschaften 98, 99–106 (2011). https://doi.org/10.1007/s00114-010-0746-z
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DOI: https://doi.org/10.1007/s00114-010-0746-z