Title
Differential virulence in two congeneric ticks infesting songbird nestlingsDifferential virulence in two congeneric ticks infesting songbird nestlings
Author
Faculty/Department
Faculty of Sciences. Biology
Research group
Evolutionary ecology group (EVECO)
Publication type
article
Publication
London,
Subject
Biology
Source (journal)
Parasitology. - London, 1908, currens
Volume/pages
138(2011):8, p. 1011-1021
ISSN
0031-1820
1469-8161
ISI
000292615100007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Virulence is part of the proximate base to the understanding of hostparasite interactions, and therefore it is crucial to interpret parasite-induced damage as an outcome of co-evolution between parasite and host. We experimentally investigated the impact of 2 congeneric ticks with contrasting transmission modes and host specificity, on the health of songbird nestlings (Parus major). The nidicolous Ixodes arboricola lives in tree holes where it obtains blood from adult birds and their nestlings, hence is prone to vertical transmission. All developmental stages of the field-dwelling Ixodes ricinus feed on different host taxa, hence are prone to horizontal transmission. Within each nest we infested 3 nestlings with varying loads of I. ricinus and 3 with Ixodes arboricola. Ixodes arboricola had no negative effects on nestling health (haematocrit, inflammation, body size, body condition). Body size was positively associated with the number of feeding I. arboricola adults. In contrast, I. ricinus infestations by nymphs and adult ticks led to haematocrit reductions. Furthermore, I. arboricola was a more prudent feeder, with longer feeding durations for smaller bloodmeals. Although the negative effects on nestling health were limited, our results are in line with current theories, stating that virulence increases with horizontal transmission, reduced dependence on individual hosts and reduced relatedness among co-exploiting ticks.
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