Energy reserves stored by migrating Gray‐cheeked Thrushes <i>Catharus minimus</i> at a spring stopover site in northern Colombia are sufficient for a long‐distance flight to North America

Bayly, Nicholas J.; Gómez, Camila; Hobson, Keith A.

doi:10.1111/ibi.12029

Cited by 37 publications

(64 citation statements)

References 40 publications

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“…The Gray-cheeked Thrush Catharus minimus is primarily an understory species that stops over in the SNSM for 12 to 14 days on spring migration, accumulating sufficient energy reserves to undertake a migratory flight of > 2500 km (Bayly et al 2013). In contrast, the Tennessee Warbler Oreothlypis peregrina is a canopy dwelling warbler that both winters and stops over in the SNSM, with the wintering population undergoing premigratory fueling there prior to spring migration (Gómez et al 2015).…”

Section: Study Speciesmentioning

confidence: 99%

“…For TEWA, we examined differences in rates of body mass change between habitats by modeling change in body mass in recaptured birds as a function of the number of days since first capture (Bayly et al 2013). Change in body mass was expressed as a percentage of lean body mass (LBM, see below).…”

Section: Modeling Body Mass Changementioning

confidence: 99%

“…For GCTH we used models of body mass change presented previously for this species in our study area using the same methodology (Bayly et al 2013). Here we present results only for premontane forest because no GCTH were recaptured in shade coffee.…”

Section: Modeling Body Mass Changementioning

confidence: 99%

“…The success of migration typically depends on a series of stopover sites distributed between the breeding and stationary nonbreeding grounds, where the energy reserves for long-distance flights are acquired (Weber et al 1998). Birds are therefore vulnerable to changes that alter the resource base at stopovers (Baker et al 2004), especially if populations rely on a small number of sites to acquire energy, as recent stopover studies and new tracking technologies suggest (Bayly et al 2013, McKinnon et al 2013a). Identifying and prioritizing stopover regions and habitats is therefore a research and conservation priority (Faaborg et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…For Nearctic-Neotropical migratory birds that migrate between North and South America, the Sierra Nevada de Santa Marta in northern Colombia has recently been shown to be an important spring and fall stopover region (Bayly et al 2012(Bayly et al , 2013, particularly at midelevations (Gómez et al 2015). At these elevations premontane forest has been extensively replaced by coffee plantations, as elsewhere in the Neotropics (Komar 2006, IDEAM 2010.…”

Section: Introductionmentioning

confidence: 99%

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Prioritizing tropical habitats for long-distance migratory songbirds: an assessment of habitat quality at a stopover site in Colombia

Bayly¹,

Gómez²,

Hobson³

et al. 2016

ACE

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ABSTRACT. Long-distance migratory birds are declining globally and migration has been identified as the primary source of mortality in this group. Despite this, our lack of knowledge of habitat use and quality at stopovers, i.e., sites where the energy for migration is accumulated, remains a barrier to designing appropriate conservation measures, especially in tropical regions. There is therefore an urgent need to assess stopover habitat quality and concurrently identify efficient and cost-effective methods for doing so. Given that fuel deposition rates directly influence stopover duration, departure fuel load, and subsequent speed of migration, they are expected to provide a direct measure of habitat quality and have the advantage of being measurable through body-mass changes. Here, we examined seven potential indicators of quality, including body-mass change, for two ecologically distinct Neotropical migratory landbirds on stopover in shade-coffee plantations and tropical humid premontane forest during spring migration in Colombia: (1) rate of body-mass change; (2) foraging rate; (3) recapture rate; (4) density; (5) flock size; (6) age and sex ratios; and (7) body-mass distribution. We found higher rates of mass change in premontane forest than in shade-coffee in Tennessee Warbler Oreothlypis peregrina, a difference that was mirrored in higher densities and body masses in forest. In Gray-cheeked Thrush Catharus minimus, a lack of recaptures in shade-coffee and higher densities in forest, also suggested that forest provided superior fueling conditions. For a reliable assessment of habitat quality, we therefore recommend using a suite of indicators, taking into account each species' ecology and methodological considerations. Our results also imply that birds stopping over in lower quality habitats may spend a longer time migrating and require more stopovers, potentially leading to important carryover effects on reproductive fitness. Evaluating habitat quality is therefore imperative prior to defining the conservation value of newly identified stopover regions.Priorisation de milieux tropicaux visant des passereaux migrateurs de longue distance : évaluation de la qualité de l'habitat dans une halte migratoire en Colombie RÉSUMÉ. Les oiseaux migrateurs de longue distance sont en diminution sur la planète et la migration a été pointée du doigt comme source primaire de mortalité chez ce groupe. Malgré ce constat, notre manque de connaissance sur l'utilisation et la qualité de l'habitat aux haltes migratoires -c.-à-d. les sites où les oiseaux accumulent l'énergie en vue de la migration -limite notre capacité à déterminer les mesures de conservation appropriées, spécialement dans les régions tropicales. L'évaluation de la qualité de l'habitat aux haltes est donc urgente, de même que la détermination de méthodes efficaces et rentables pour s'y prendre. Étant donné que les taux d'accumulation d'énergie influent directement sur la durée de séjour aux haltes, la charge d'énergie au départ d'une halte et la vitesse subséqu...

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Section: Study Speciesmentioning

confidence: 99%

Section: Modeling Body Mass Changementioning

confidence: 99%

Section: Modeling Body Mass Changementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prioritizing tropical habitats for long-distance migratory songbirds: an assessment of habitat quality at a stopover site in Colombia

Bayly¹,

Gómez²,

Hobson³

et al. 2016

ACE

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Community modeling reveals the importance of elevation and land cover in shaping migratory bird abundance in the Andes

Arias

Wilson

Bayly

2021

Ecological Applications

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The tropical Andes are characterized by extreme topographic and climatic complexity, which has likely contributed to their outstanding current species diversity, composed of many range‐restricted species. However, little is known about how the distribution and abundance of highly mobile organisms, like long‐distance migratory birds, varies across different land covers, elevations, and climatic conditions within the Andes. We conducted 1,606 distance‐sampling point counts across the Colombian Andes, spanning elevations from 253 to 3,708 m, a range of precipitation regimes and representative land covers. We then employed a novel application of a multispecies hierarchical modeling approach to evaluate how elevation, local land cover, aboveground woody biomass, cloud cover, precipitation, and seasonality in precipitation shape the abundance of the migratory land bird community in the Andes. We detected 1,824 individuals of 29 species of migratory land birds, six of which were considered incidental in our study region. We modeled the abundance of the remaining 23 species, while considering observer and time of day effects on detectability. We found that both elevation and land cover had an overriding influence on the abundance of migratory species across the Andes, with strong evidence for a mid‐elevation peak in abundance, and species‐specific responses to both variables. As a community, migratory birds had the highest mean abundance in shade coffee plantations, secondary forest, and mature forest. Aboveground woody biomass did not affect the abundance of all species as a group, but a few showed strong responses to this variable. Contrary to predictions of a positive correlation between abundance and precipitation, we found no evidence for community‐level responses to precipitation, aside for a weak tendency for birds to select areas with intermediate levels of precipitation. This novel use of a multispecies model sheds new light on the mechanisms shaping the winter distribution of migratory birds and highlights the importance of elevation and land cover types over climatic variables in the context of the Colombian Andes.

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Range‐wide populations of a long‐distance migratory songbird converge during stopover in the tropics

Gómez

Guerrero

FitzGerald

et al. 2019

Ecological Monographs

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Geographic convergence during migration influences the extent to which animal populations may experience carry‐over effects across periods of the annual cycle. When most individuals of a population share geographic areas during a given priod, carry‐over effects are likely stronger than when individuals occupy multiple areas. We used genetic data and stable isotope (δ2H) measurements from feathers and claws to describe the likely breeding and wintering geographic origins of a long‐distance migratory songbird (Gray‐cheeked Thrush, Catharus minimus) moving through northern Colombia in spring and fall migration. Furthermore, we used these data coupled with regional occupancy surveys to assess whether individuals from various breeding populations converge during migration and evaluated whether geographic origin, age, or sex affected stopover strategies. We found that range‐wide breeding populations of Gray‐cheeked Thrush converged in northern Colombia in an area spanning <1% of the breeding range, especially during a prolonged spring stopover in the Sierra Nevada de Santa Marta. Breeding (but not winter) origin, sex, and age influenced arrival date and body condition upon arrival at stopover sites where populations converged. Birds from more northerly breeding latitudes, males and adults generally arrived earlier and in lower body condition than those with more southerly breeding origins, females, and juveniles. Our work and other studies suggest that areas in northern Colombia may function as ecological bottlenecks for Gray‐cheeked Thrush because they concentrate individuals from across the breeding range, provide critical resources, and impose constraints during migration. Future studies quantifying the effects of high‐convergence areas on fitness and survival of individuals and their demographic consequences are required to assess their roles as ecological bottlenecks.

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Energy reserves stored by migrating Gray‐cheeked Thrushes Catharus minimus at a spring stopover site in northern Colombia are sufficient for a long‐distance flight to North America

Cited by 37 publications

References 40 publications

Prioritizing tropical habitats for long-distance migratory songbirds: an assessment of habitat quality at a stopover site in Colombia

Prioritizing tropical habitats for long-distance migratory songbirds: an assessment of habitat quality at a stopover site in Colombia

Community modeling reveals the importance of elevation and land cover in shaping migratory bird abundance in the Andes

Range‐wide populations of a long‐distance migratory songbird converge during stopover in the tropics

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