Browsing by Author "Ruthrauff DR"

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    High dispersal ability versus migratory traditions: Fine-scale population structure and post-glacial colonisation in bar-tailed godwits.
    (John Wiley and Sons Ltd, 2024-07-06) Conklin JR; Verkuil YI; Lefebvre MJM; Battley PF; Bom RA; Gill RE; Hassell CJ; Ten Horn J; Ruthrauff DR; Tibbitts TL; Tomkovich PS; Warnock N; Piersma T; Fontaine MC; Hansen MM
    In migratory animals, high mobility may reduce population structure through increased dispersal and enable adaptive responses to environmental change, whereas rigid migratory routines predict low dispersal, increased structure, and limited flexibility to respond to change. We explore the global population structure and phylogeographic history of the bar-tailed godwit, Limosa lapponica, a migratory shorebird known for making the longest non-stop flights of any landbird. Using nextRAD sequencing of 14,318 single-nucleotide polymorphisms and scenario-testing in an Approximate Bayesian Computation framework, we infer that bar-tailed godwits existed in two main lineages at the last glacial maximum, when much of their present-day breeding range persisted in a vast, unglaciated Siberian-Beringian refugium, followed by admixture of these lineages in the eastern Palearctic. Subsequently, population structure developed at both longitudinal extremes: in the east, a genetic cline exists across latitude in the Alaska breeding range of subspecies L. l. baueri; in the west, one lineage diversified into three extant subspecies L. l. lapponica, taymyrensis, and yamalensis, the former two of which migrate through previously glaciated western Europe. In the global range of this long-distance migrant, we found evidence of both (1) fidelity to rigid behavioural routines promoting fine-scale geographic population structure (in the east) and (2) flexibility to colonise recently available migratory flyways and non-breeding areas (in the west). Our results suggest that cultural traditions in highly mobile vertebrates can override the expected effects of high dispersal ability on population structure, and provide insights for the evolution and flexibility of some of the world's longest migrations.
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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.