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Does Influenza A affect body condition of wild mallard ducks, or vice versa?

Proceedings of the Royal Society B: Biological Sciences

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Abstract

Low pathogenic avian influenza (LPAI) viruses are well documented to circulate within wild waterfowl populations (Olsen et al. 2006). It has been assumed that these infections are benign with no subsequent effects on life-history parameters. The study by Latorre-Margalef et al. (2009; hereafter L.-M. et al.) represents an important step, as they attempt to test this assumption in wild birds. L.-M. et al. captured migrating mallards (Anas platyrhynchos) at a staging area and tested them for the presence of avian influenza A virus (IAV). They related IAV infection status to body mass and duration of time spent on the staging area. Overall, the study is well designed with impressive sample sizes and the analyses are carefully conducted and presented. However, in discussing these results, the authors assume causation based upon correlation and, although they acknowledge the possibility of immunosuppression during migration due to reduced energy stores, they do not discuss it as a possible explanation for their findings. Below, we consider several of the major findings by L.-M. et al., providing alternative explanations for the results. Because the L.-M. et al. study design is correlational, it is not possible to use their data to distinguish between their interpretations and our alternative explanations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Does Influenza A affect body condition of wild mallard ducks, or vice versa?
Series title:
Proceedings of the Royal Society B: Biological Sciences
Volume
276
Issue:
1666
Year Published:
2009
Language:
English
Publisher:
Royal Society Publishing
Publisher location:
London, United Kingdom
Contributing office(s):
Alaska Science Center
Description:
2 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the Royal Society B: Biological Sciences
First page:
2345
Last page:
2346