Hampered performance of migratory swans: intra- and inter-seasonal effects of avian influenza virus

Hoye, Bethany J., Munster, Vincent J., Huig, Naomi, de Vries, Peter, Oosterbeek, Kees, Tijsen, Wim, Klaassen, Marcel, Fouchier, Ron A. M. and van Gils, Jan A. 2016, Hampered performance of migratory swans: intra- and inter-seasonal effects of avian influenza virus, Integrative and comparative biology, vol. 56, no. 2, pp. 317-329, doi: 10.1093/icb/icw038.

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Title Hampered performance of migratory swans: intra- and inter-seasonal effects of avian influenza virus
Author(s) Hoye, Bethany J.ORCID iD for Hoye, Bethany J. orcid.org/0000-0001-9502-5582
Munster, Vincent J.
Huig, Naomi
de Vries, Peter
Oosterbeek, Kees
Tijsen, Wim
Klaassen, MarcelORCID iD for Klaassen, Marcel orcid.org/0000-0003-3907-9599
Fouchier, Ron A. M.
van Gils, Jan A.
Journal name Integrative and comparative biology
Volume number 56
Issue number 2
Start page 317
End page 329
Total pages 13
Publisher Oxford University Press
Place of publication Oxford, England
Publication date 2016-06-30
ISSN 1540-7063
Keyword(s) animal migrations
parasite transmission
physiological stress
low-pathogenic avian influenza viruses
Bewick’s swans
Summary The extent to which animal migrations shape parasite transmission networks is critically dependent on a migrant's ability to tolerate infection and migrate successfully. Yet, sub-lethal effects of parasites can be intensified through periods of increased physiological stress. Long-distance migrants may, therefore, be especially susceptible to negative effects of parasitic infection. Although a handful of studies have investigated the short-term, transmission-relevant behaviors of wild birds infected with low-pathogenic avian influenza viruses (LPAIV), the ecological consequences of LPAIV for the hosts themselves remain largely unknown. Here, we assessed the potential effects of naturally-acquired LPAIV infections in Bewick's swans, a long-distance migratory species that experiences relatively low incidence of LPAIV infection during early winter. We monitored both foraging and movement behavior in the winter of infection, as well as subsequent breeding behavior and inter-annual resighting probability over 3 years. Incorporating data on infection history we hypothesized that any effects would be most apparent in naïve individuals experiencing their first LPAIV infection. Indeed, significant effects of infection were only seen in birds that were infected but lacked antibodies indicative of prior infection. Swans that were infected but had survived a previous infection were indistinguishable from uninfected birds in each of the ecological performance metrics. Despite showing reduced foraging rates, individuals in the naïve-infected category had similar accumulated body stores to re-infected and uninfected individuals prior to departure on spring migration, possibly as a result of having higher scaled mass at the time of infection. And yet individuals in the naïve-infected category were unlikely to be resighted 1 year after infection, with 6 out of 7 individuals that never resighted again compared to 20 out of 63 uninfected individuals and 5 out of 12 individuals in the re-infected category. Collectively, our findings indicate that acute and superficially harmless infection with LPAIV may have indirect effects on individual performance and recruitment in migratory Bewick's swans. Our results also highlight the potential for infection history to play an important role in shaping ecological constraints throughout the annual cycle.
Notes From the symposium ‘‘Are Migratory Animals Superspreaders of Infection?’’ presented at the annual meeting of the Society for Integrative and Comparative Biology, January 3–7, 2016 at Portland, Oregon.
Language eng
DOI 10.1093/icb/icw038
Field of Research 060299 Ecology not elsewhere classified
050206 Environmental Monitoring
0608 Zoology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084782

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