Browsing by Author "Bêty J"

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    Effects of geolocators on hatching success, return rates, breeding movements, and change in body mass in 16 species of Arctic-breeding shorebirds.
    (2016) Weiser EL; Lanctot RB; Brown SC; Alves JA; Battley PF; Bentzen R; Bêty J; Bishop MA; Boldenow M; Bollache L; Casler B; Christie M; Coleman JT; Conklin JR; English WB; Gates HR; Gilg O; Giroux M-A; Gosbell K; Hassell C; Helmericks J; Johnson A; Katrínardóttir B; Koivula K; Kwon E; Lamarre J-F; Lang J; Lank DB; Lecomte N; Liebezeit J; Loverti V; McKinnon L; Minton C; Mizrahi D; Nol E; Pakanen V-M; Perz J; Porter R; Rausch J; Reneerkens J; Rönkä N; Saalfeld S; Senner N; Sittler B; Smith PA; Sowl K; Taylor A; Ward DH; Yezerinac S; Sandercock BK
    BACKGROUND: Geolocators are useful for tracking movements of long-distance migrants, but potential negative effects on birds have not been well studied. We tested for effects of geolocators (0.8-2.0 g total, representing 0.1-3.9 % of mean body mass) on 16 species of migratory shorebirds, including five species with 2-4 subspecies each for a total of 23 study taxa. Study species spanned a range of body sizes (26-1091 g) and eight genera, and were tagged at 23 breeding and eight nonbreeding sites. We compared breeding performance and return rates of birds with geolocators to control groups while controlling for potential confounding variables. RESULTS: We detected negative effects of tags for three small-bodied species. Geolocators reduced annual return rates for two of 23 taxa: by 63 % for semipalmated sandpipers and by 43 % for the arcticola subspecies of dunlin. High resighting effort for geolocator birds could have masked additional negative effects. Geolocators were more likely to negatively affect return rates if the total mass of geolocators and color markers was 2.5-5.8 % of body mass than if tags were 0.3-2.3 % of body mass. Carrying a geolocator reduced nest success by 42 % for semipalmated sandpipers and tripled the probability of partial clutch failure in semipalmated and western sandpipers. Geolocators mounted perpendicular to the leg on a flag had stronger negative effects on nest success than geolocators mounted parallel to the leg on a band. However, parallel-band geolocators were more likely to reduce return rates and cause injuries to the leg. No effects of geolocators were found on breeding movements or changes in body mass. Among-site variation in geolocator effect size was high, suggesting that local factors were important. CONCLUSIONS: Negative effects of geolocators occurred only for three of the smallest species in our dataset, but were substantial when present. Future studies could mitigate impacts of tags by reducing protruding parts and minimizing use of additional markers. Investigators could maximize recovery of tags by strategically deploying geolocators on males, previously marked individuals, and successful breeders, though targeting subsets of a population could bias the resulting migratory movement data in some species.
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    Power source, data retrieval method, and attachment type affect success of dorsally mounted tracking tag deployments in 37 species of shorebirds
    (John Wiley and Sons Ltd on behalf of Nordic Society Oikos, 2025-12-04) Weiser EL; Lanctot RB; Ruthrauff DR; Saalfeld ST; Tibbitts TL; Abad-Gómez JM; Aldabe J; de Almeida JB; Alves JA; Anderson GQA; Battley PF; Belting H; Bêty J; Bianchini K; Bishop MA; Bom RA; Bowgen K; Brown GS; Brown SC; Bugoni L; Burton NHK; Bybee DR; Carneiro C; Castresana G; Chan Y-C; Choi C-Y; Christie KS; Clark NA; Conklin JR; Cruz-López M; Dinsmore SJ; Dodd SG; Douglas DC; Eberhart-Hertel LJ; English WB; Ewing HT; Faria FA; Franks SE; Fuller RA; Gill RE; Giroux M-A; Gratto-Trevor CL; Green DJ; Green RE; Green RMW; Gunnarsson TG; Gutiérrez JS; Harrison A-L; Hartman CA; Hassell CJ; Hoepfner SA; Hooijmeijer JCEW; Johnson JA; Johnson OW; Kempenaers B; Klaassen M; Kok EMA; Krietsch J; Küpper C; Kwarteng AY; Kwon E; Lamarre J-F; Latty CJ; Lecomte N; Loonstra AHJ; Ma Z; Mander L; Marlow C; Marra PP; Masero JA; McDuffie LA; McGuire RL; Melter J; Melville DS; Méndez V; Michels TJ; Morrissey CA; Mu T; Newstead DJ; Page GW; Pierce AK; Piersma T; Repenning M; Robinson BH; Rocha AD; Rogers DI; Scarpignato AL; Schulte S; Scragg ES; Senner NR; Smith PA; Taylor AR; Taylor RC; Þórisson B; Valcu M; Verhoeven MA; Ware L; Warnock N; Weber MF; Wright LJ; Wunder MB; Shamoun-Baranes J; Bensch S
    Animal-borne trackers are commonly used to study bird movements, including in long-distance migrants such as shorebirds. Selecting a tracker and attachment method can be daunting, and methodological advancements often have been made by trial and error and conveyed by word of mouth. We synthesized tracking outcomes across 2745 dorsally mounted trackers on 37 shorebird species around the world. We evaluated how attachment method, power source, data retrieval method, relative tracker mass, and biological traits affected success, where success was defined as whether or not each tag deployment reached its expected tracking duration (i.e. all aspects succeeded for the intended duration of the study: attachment, tracking, data acquisition, and bird survival). We conducted separate analyses for tag deployments with remote data retrieval (‘remote-upload tag deployments') and those that archived data and had to be recovered (‘archival tag deployments'). Among remote-upload tag deployments, those that were a lighter mass relative to the bird, were beyond their first year of production, transmitted data via satellite, or were attached with a leg-loop harness were most often successful at reaching their expected tracking duration. Archival tag deployments were most successful when applied at breeding areas, or when applied to males in any season. Remote-upload tag deployments with solar power, satellite data retrieval, or leg-loop harnesses continued tracking for longer than those with battery power, other types of data retrieval, or glue attachments. However, the majority of tag deployments failed to reach their expected tracking duration (71% of remote-upload, 83% of archival), which could have been due to tracker failure, attachment failure, or bird mortality. Our findings highlight that many tag deployments may fail to meet the goals of a study if tracking duration is crucial. Using our results, we provide guidelines for selecting a tracker and attachment to improve success at meeting study goals.