Data from: Effect of light-level geolocators on apparent survival of two highly aerial swift species ...

• Main Authors: Morganti, Michelangelo, Rubolini, Diego, Akesson, Susanne, Bermejo, Ana, De La Puente, Javier, Lardelli, Roberto, Liechti, Felix, Boano, Giovanni, Tomassetto, Erika, Ferri, Mauro, Caffi, Mario, Saino, Nicola, Ambrosini, Roberto
• Format: Dataset
• Language: English
• Published: Dryad 2017
• Subjects: Apus pallidus; aerial foragers; capture-mark-recapture; Apus apus; geolocator
• Online Access: https://dx.doi.org/10.5061/dryad.b1t42; https://datadryad.org/stash/dataset/doi:10.5061/dryad.b1t42

Light-level geolocators are currently widely used to track the migration of small-sized birds, but their potentially detrimental effects on survival of highly aerial species have been poorly investigated so far. We recorded capture-recapture histories of 283 common swifts Apus apus and 107 pallid swifts Apus pallidus breeding in 14 colonies in Italy, Spain, Sweden and Switzerland that were deployed with 10 different types of geolocators (‘geolocator birds’), and compared their survival with that of, respectively, 215 common and 101 pallid swifts not equipped with geolocators (‘control birds’). We performed both traditional GLMM using return rate as a proxy for survival and mark-recapture models to estimate survival while accounting for recapture probability. In all the analyses, geolocator birds showed reduced apparent survival compared to controls. The extent of the negative effect on survival differed between the species but the direction of the difference between species was opposite in either type of ... : return ratestable showing return rates of geolocator and control birds in form of aggregated data (one record per year, study site and species of birds) for Italian and Swiss study sites.This data were used for the analysis shown in Table 4 of main text.swift biometriesfile containing measures of wing and weight of Apus apus and Apus pallidus from the study sites for which these were available.biometries.xlsxgeolocator birdsTable having 372 records exclusively belonging to geolocators birds from all the 14 study sites. Geolocator type, weight and appearence (flat vs with light stalk) are indicated. Dataset used to run the model shown in Table 5 of the main text.all geolocator birds.xlsxcapture recapture histories for MARKCapture-recapture histories in format 01 used to run the MARK analysis described in the paper. Look at the legend for details. ...