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Auteur (up) Rishworth, G.M.; Tremblay, Y.; Green, D.B.; Pistorius, P.A. url  doi
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  Titre An automated approach towards measuring time-activity budgets in colonial seabirds Type Article scientifique
  Année 2014 Publication Revue Abrégée Methods Ecol Evol  
  Volume 5 Numéro 9 Pages 854-863  
  Mots-Clés automated monitoring; Bioindicator; Cape gannet; foraging effort; very high frequency  
  Résumé * Seabird proxies have the potential to act as useful and cost-effective indicators of the state of the marine environment. Seabird time-activity budgets, in particular, reflect short-term changes in prey conditions. * We tested an automated technique for long-term continuous recording of Cape gannet, Morus capensis, time-activity budgets using coded very high frequency (VHF) transmitters allowing for simultaneous monitoring of a large sample of study birds. * Radiotransmitters attached to leg-rings had no impact on adult foraging trip and nest attendance durations, breeding success or chick growth. Furthermore, frequencies of nest attendance and foraging trip durations estimated by the VHF logging system were no different to those estimated from hourly direct observations. * Using time-depth recorders, the relationship between the time that birds rested on the sea surface in relation to foraging trip duration was assessed. Trip duration during chick rearing was clearly an accurate proxy for foraging effort. * The VHF monitoring system provides a simple method of accurately assessing the time-activity budgets of colonial seabirds, which can be expanded to a range of other colonially breeding taxa. In the case of seabirds, this approach can potentially provide sensitive, real-time indicators of prey abundance for fisheries management.  
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  ISSN 2041-210x ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1203  
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