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Minor differences in body condition and immune status between avian influenza virus-infected and noninfected mallards: a sign of coevolution?

van Dijk, Jacintha G. B., Fouchier, Ron A. M., Klaassen, Marcel and Matson, Kevin D. 2015, Minor differences in body condition and immune status between avian influenza virus-infected and noninfected mallards: a sign of coevolution?, Ecology and evolution, vol. 5, no. 2, pp. 436-449, doi: 10.1002/ece3.1359.

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Title Minor differences in body condition and immune status between avian influenza virus-infected and noninfected mallards: a sign of coevolution?
Author(s) van Dijk, Jacintha G. B.
Fouchier, Ron A. M.
Klaassen, MarcelORCID iD for Klaassen, Marcel orcid.org/0000-0003-3907-9599
Matson, Kevin D.
Journal name Ecology and evolution
Volume number 5
Issue number 2
Start page 436
End page 449
Total pages 14
Publisher Wiley
Place of publication Chichester, Eng.
Publication date 2015-01
ISSN 2045-7758
Keyword(s) Anas platyrhynchos
body mass
infectious disease
migrant
pathogen
shedding
wild birds
Science & Technology
Life Sciences & Biomedicine
Ecology
Environmental Sciences & Ecology
A VIRUS
ANAS-PLATYRHYNCHOS
NATURAL ANTIBODIES
STABLE HYDROGEN
VICE-VERSA
DUCKS
PATTERNS
MIGRATION
ISOTOPES
Summary Wildlife pathogens can alter host fitness. Low pathogenic avian influenza virus (LPAIV) infection is thought to have negligible impacts on wild birds; however, effects of infection in free-living birds are largely unstudied. We investigated the extent to which LPAIV infection and shedding were associated with body condition and immune status in free-living mallards (Anas platyrhynchos), a partially migratory key LPAIV host species. We sampled mallards throughout the species' annual autumn LPAIV infection peak, and we classified individuals according to age, sex, and migratory strategy (based on stable hydrogen isotope analysis) when analyzing data on body mass and five indices of immune status. Body mass was similar for LPAIV-infected and noninfected birds. The degree of virus shedding from the cloaca and oropharynx was not associated with body mass. LPAIV infection and shedding were not associated with natural antibody (NAbs) and complement titers (first lines of defense against infections), concentrations of the acute phase protein haptoglobin (Hp), ratios of heterophils to lymphocytes (H:L ratio), and avian influenza virus (AIV)-specific antibody concentrations. NAbs titers were higher in LPAIV-infected males and local (i.e., short distance) migrants than in infected females and distant (i.e., long distance) migrants. Hp concentrations were higher in LPAIV-infected juveniles and females compared to infected adults and males. NAbs, complement, and Hp levels were lower in LPAIV-infected mallards in early autumn. Our study demonstrates weak associations between infection with and shedding of LPAIV and the body condition and immune status of free-living mallards. These results may support the role of mallards as asymptomatic carriers of LPAIV and raise questions about possible coevolution between virus and host.
Language eng
DOI 10.1002/ece3.1359
Field of Research 060299 Ecology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30072451

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.