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Pushed to the limit: food abundance determines tag-induced harm in penguins

By R. P. Wilson, J. E. Sala, A. Gomez-Laich, J. Ciancio, F. Quintana

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Abstract

The energetic costs of animal movement change with body condition, although the consequences of this for foraging efficiency are rarely considered. We deployed externally attached devices to Magellanic penguins ( Spheniscus magellanicus), known to increase the costs of swimming via increased drag in a consistent manner, and noted, however, that foraging behaviour and efficiency varied dramatically between years. We used our results to construct an energetics-based model and found that small increases in drag due to the attachment of externally attached tags predicted accelerating harm as prey availability decreased, which accorded with our observations. This explains earlier observations of differential breeding success in tagged versus untagged penguins in particular years, highlights the importance of understanding how animal body condition may affect population processes in general and advocates caution in interpretations of tag-derived data over variable environmental conditions.

Publication Title Animal Welfare
Volume 24
Issue 1
Pages 37-44
ISBN/ISSN 0962-7286
Publisher Universities Federation for Animal Welfare
Language English
Author Address Swansea Lab for Animal Movement, Biosciences, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, UK.r.p.wilson@swansea.ac.uk
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Tags
  1. Animal behavior
  2. Animals
  3. Animal welfare
  4. Birds
  5. Body condition
  6. Costs
  7. Energy
  8. Environment
  9. Foraging
  10. peer-reviewed
  11. Penguins
  12. prey
  13. swimming
  14. vertebrates
Badges
  1. peer-reviewed