Marine Biology

, Volume 146, Issue 3, pp 619–624 | Cite as

Short-term effects of data-loggers on Cory’s shearwater (Calonectris diomedea)

  • J. M. IgualEmail author
  • M. G. Forero
  • G. Tavecchia
  • J. González-Solis
  • A. Martínez-Abraín
  • K. A. Hobson
  • X. Ruiz
  • D. Oro
Research Article


We investigated the possible effects of a 12-g data-logger attached to a darvic ring on the performance of Cory’s shearwater (Calonectris diomedea, 600–850 g) from two different colonies in the western Mediterranean Sea. We compared return rates, current breeding success and body condition between equipped and unequipped birds. Effects on feeding ecology during winter and breeding period was also evaluated through the measurement of stable isotopes of carbon (δ13C) and nitrogen (δ15N) in one of the colonies. We found no evidence of negative effects of loggers on demographic parameters analysed or in feeding ecology. Power analyses suggested a high power to detect medium effect size, but a low power to detect small changes. Despite the non-significant results we could only exclude medium to strong effects of the devices on one of these parameters. We detected some short-term negative effects on body condition for the equipped birds, but these were unlikely to have had important consequences. Results suggest that the use of loggers is an adequate methodology to obtain information from seabirds at sea, but data should be carefully interpreted with regard to potential biases during severe environmental conditions.


Stable Isotope Body Condition Return Rate Breeding Success Stable Isotope Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We are very grateful to GENA (especially to T. Gomez and I. Afán) and to J. Zapata (Director of Chafarinas Islands Hunting National Refugee) for their help. At Pantaleu, M. Mayol and the wardens of Dragonera gently provided logistic support. We also thank the people who helped during the field work, especially M. Genovart and the wardens of the Columbretes (R. Berenguer and V. Ferrís). We also thank J.P. Croxall, V. Afanasyev and D. Briggs for making available geolocators for this study. P. Healy assisted with preparation of samples for stable isotope analysis, which were analysed at the Department of Soil Science, University of Saskatchewan, Canada. M.G.F. and J.G.S. were supported by a contract of the Program Ramon y Cajal of the Spanish Ministerio de Ciencia y Tecnología (MCyT). Additional support was provided by the grants REN2002–00450/GLO and BOS2003–01960 from MCyT. We are also grateful to three anonymous referees for improving a previous draft of the manuscript, and to R. Pradel for his help and comments on power analyses.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • J. M. Igual
    • 1
    Email author
  • M. G. Forero
    • 2
  • G. Tavecchia
    • 1
  • J. González-Solis
    • 3
    • 4
  • A. Martínez-Abraín
    • 1
  • K. A. Hobson
    • 5
  • X. Ruiz
    • 3
  • D. Oro
    • 1
  1. 1.Instituto Mediterráneo de Estudios AvanzadosIMEDEA (CSIC-UIB)EsporlesSpain
  2. 2.Department of Applied BiologyEstación Biológica de DoñanaSevillaSpain
  3. 3.Dep. Biologia Animal (Vertebrates)Universidad de BarcelonaBarcelonaSpain
  4. 4.British Antarctic SurveyNatural Environment Research CouncilCambridgeUnited Kingdom
  5. 5.Canadian Wildlife ServiceSaskatoonCanada

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