4 Works

Rapid recovery by fat- and muscle-depleted Blackpoll Warblers following trans-oceanic migration is driven by time-minimization

Nicholas J. Bayly, Kenneth V. Rosenberg, Ryan Norris, Philip D. Taylor & Keith A. Hobson
Non-stop endurance flights are a defining characteristic of many long-distance migratory birds but subsequent recovery phases are not typically distinguished from fueling phases (collectively ‘stopovers’), despite endurance flights inducing marked physiological changes including flight muscle atrophy and gastrointestinal tract reductions. Here, we hypothesize that recovery requires unique behavioral adaptations, leading to departures from the predictions of optimal migration theory for time-minimizing migrants. We predict that recovering birds will 1) select (moist) food-rich habitats on arrival;...

Data from: Sequential use of niche and occupancy models identifies conservation and research priority areas for two data-poor endemic birds from the Colombian Andes

Esteban Botero-Delgadillo, Sandra Escudero-Páez, Jeyson Sanabria-Mejía, Pilar Caicedo & Nicholas J. Bayly
The lack of high-quality information on data-poor species can hinder efforts to inform conservation actions via spatial distribution modeling. This is particularly true for tropical birds of conservation concern, for which ecological studies and assessments of their conservation status have received limited funding. Here we use a cost- and time-efficient protocol for assessing the distribution of range-restricted taxa and to identify priority areas for their conservation based on a sequential application of Environmental Niche Models...

Earlier and slower or later and faster: Spring migration pace linked to departure time in a Neotropical migrant songbird

Ana M. González-Prieto, Nicholas J. Bayly & Keith A. Hobson
1. Migratory birds travel vast distances and the timing of migratory flights can affect survival and the ability to reproduce. For Neotropical migrant songbirds, early spring departure from wintering sites, early arrival to the breeding grounds and higher reproductive success have been related to the use of suitable habitats and environmental conditions during the non-breeding season. However, how migratory strategies are shaped by winter habitat choice is largely unknown due to the general inability to...

Cerulean Warbler light-level geolocator data

Douglas Raybuck, Than Boves, Scott Stoleson, Jeffery Larkin, Nicholas Bayly, Lesley Bulluck, Gregory George, Kate Slankard, Laura Kearns, Sharon Petzinger, John Cox & David Buehler
The Cerulean Warbler (Setophaga cerulea) is a declining Nearctic-Neotropical migratory species of conservation concern. Implementing full annual cycle conservation strategies to facilitate recovery has been difficult because we know little about the migratory period or connectivity between North American breeding regions and South American non-breeding regions. Between 2014–2017, we deployed geolocators on 282 males at 13 study sites throughout the species’ range with the objectives of a) evaluating the strength of connectivity between breeding and...

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