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Seasonal and circadian biases in bird tracking with solar GPS-tags [Dataset]

AutorSilva, Rafa; Afán, Isabel ; Gil, Juan A.; Bustamante, Javier
Palabras claveFix-rate bias
Solar-powered tags
GPS tracking
Duty cycle
Argos
GSM-GPRS
Bird behavior
Bearded vulture
Fecha de publicación2017
CitaciónSeasonal and circadian biases in bird tracking with solar GPS-tags [Dataset], 2017
ResumenGlobal Positioning System (GPS) tags are nowadays widely used in wildlife tracking. This geolocation technique can suffer from fix loss biases due to poor satellite GPS geometry, that result in tracking data gaps leading to wrong research conclusions. In addition, new solar-powered GPS tags deployed on birds can suffer from a new “battery drain bias” currently ignored in movement ecology analyses. We use a GPS tracking dataset of bearded vultures (Gypaetus barbatus), tracked for several years with solar GPS tags, to evaluate the causes and triggers of fix and data retrieval loss biases. We compare two models of solar GPS tags using different data retrieval systems (Argos vs GSM-GPRS), and programmed with different duty cycles. Neither of the models was able to accomplish the duty cycle programed initially. Fix and data retrieval loss rates were always greater than expected, and showed non-random gaps in GPS locations. Number of fixes per month of tracking was a bad criterion to identify tags with smaller biases. Fix-loss rates were four times higher due to battery drain than due to poor GPS satellite geometry. Both tag models were biased due to the uneven solar energy available for the recharge of the tag throughout the annual cycle, resulting in greater fix-loss rates in winter compared to summer. In addition, we suggest that the bias found along the diurnal cycle is linked to a complex three-factor interaction of bird flight behavior, topography and fix interval. More fixes were lost when vultures were perching compared to flying, in rugged versus flat topography. But long fix-intervals caused greater loss of fixes in dynamic (flying) versus static situations (perching). To conclude, we emphasize the importance of evaluating fix-loss bias in current tracking projects, and deploying GPS tags that allow remote duty cycle updates so that the most appropriate fix and data retrieval intervals can be selected.
DescripciónDatasets as supporting information to article “Seasonal and circadian biases in bird tracking with solar GPS-tags” published in PLOS ONE. Address questions to Rafa Silva: rafasilva@ebd.csic.es
URIhttp://hdl.handle.net/10261/155119
DOIhttp://dx.doi.org/10.20350/digitalCSIC/8517
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GPS_tests.csv8,95 kBUnknownVisualizar/Abrir
Transmissions.csv199,98 kBUnknownVisualizar/Abrir
Fixes.csv8,87 MBUnknownVisualizar/Abrir
Readme.txt2,13 kBTextVisualizar/Abrir
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