Inferring seabird activity budgets from leg-mounted time–depth recorders

Journal of Ornithology - Tập 155 - Trang 301-306 - 2013
Jannie Fries Linnebjerg1, Nicholas Per Huffeldt1,2, Knud Falk1, Flemming R. Merkel1,3, Anders Mosbech1,4, Morten Frederiksen1
1Department of Bioscience, Aarhus University, Roskilde, Denmark
2Behavioural Ecology, Department of Biology, University of Copenhagen, Copenhagen Ø, Denmark
3Greenland Institute of Natural Resources, Nuuk, Greenland
4Arctic Research Center, Aarhus University, Aarhus C, Denmark

Tóm tắt

Leg-mounted loggers are increasingly used in seabird activity studies, but few studies have validated the information obtained about bird behaviour with independent data. Using Brünnich’s Guillemot Uria lomvia as a study species, we show by comparing interpretations of time–depth recorder (TDR) data with visual observations that activity budgets inferred from leg-mounted TDRs provide reliable information on colony attendance, and validate information on flight time by comparing periods interpreted as flight based on TDR data with periods interpreted as flight based on GPS speed information. Yet, special attention is needed because auks resting at sea occasionally withdraw one leg and/or foot into the plumage (leg-in-plumage). During this behaviour, the TDR may be warm and dry, potentially leading to spurious identification of colony visits. In our case study, spurious identification of colony visits would have resulted in mean trip duration being underestimated by a factor of 4, and number of trips being correspondingly overestimated. We therefore urge great care when deriving activity budgets from leg-mounted TDRs, but nonetheless recommend using leg-mounted TDRs to infer activity budgets from diving seabirds, particularly for longer deployments.

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Thông tin xuất bản

Journal of Ornithology

Tập 155

301-306

Thông tin tác giả