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Antiparasite treatments reduce humoral immunity and impact oxidative status in raptor nestlings

Hanssen, Sveinn Are; Bustnes, Jan Ove; Schnug, Lisbeth; Bourgeon, Sophie; Johnsen, Trond Vidar; Ballesteros, Manuel; Sonne, Christian; Herzke, Dorte; Eulaers, Igor; Jaspers, Veerle; Covaci, Adrian; Eens, Marcel; Halley, Duncan John; Moum, Truls Borg; Ims, Rolf Anker; Erikstad, Kjell E
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/298410
Date
2013
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  • Institutt for biologi [1707]
  • Publikasjoner fra CRIStin - NTNU [21809]
Original version
Ecology and Evolution 2013, 3(16):5157-5166   10.1002/ece3.891
Abstract
Parasites are natural stressors that may have multiple negative effects on their

host as they usurp energy and nutrients and may lead to costly immune

responses that may cause oxidative stress. At early stages, animals may be more

sensitive to infectious organisms because of their rapid growth and partly

immature immune system. The objective of this study was to explore effects of

parasites by treating chicks of two raptor species (northern goshawk Accipiter

gentilis and white-tailed sea eagle Haliaeetus albicilla) against both endoparasites

(internal parasites) and ectoparasites (external parasites). Nests were either treated

against ectoparasites by spraying with pyrethrin or left unsprayed as control

nests. Within each nest, chicks were randomly orally treated with either an antihelminthic

medication (fenbendazole) or sterile water as control treatment. We

investigated treatment effects on plasma (1) total antioxidant capacity TAC (an

index of nonenzymatic circulating antioxidant defenses), (2) total oxidant status

TOS (a measure of plasmatic oxidants), and (3) immunoglobulin levels (a measure

of humoral immune function). Treatment against ectoparasites led to a

reduction in circulating immunoglobulin plasma levels in male chicks. TOS was

higher when not receiving any parasite reduction treatment and when receiving

both endo- and ectoparasitic reduction treatment compared with receiving only

one treatment. TAC was higher in all treatment groups, when compared to

controls. Despite the relatively low sample size, this experimental study suggests

complex but similar relationships between treatment groups and oxidative status

and immunoglobulin levels in two raptor species.

Costs of parasitism, immunoecology,

immunoglobulin, oxidative status.
Publisher
Wiley Open Access
Journal
Ecology and Evolution

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