Garden Warbler<i>Sylvia borin</i>migration in sub‐Saharan West Africa

Bayly, Nicholas J.; Rumsey, Stephen

doi:10.1080/03078698.2010.9674417

Cited by 9 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distribution of body mass in a stopover population is not only shaped by birds that remain to fuel but also by transient birds passing through. Indeed, there are sites where birds carrying large fuel reserves make emergency stops when flying conditions are unfavorable (Bayly and Rumsey 2010); again, this highlights the need to first establish whether birds actually fuel in a region to avoid arriving at the wrong conclusion.…”

Section: Indicators Of Habitat Qualitymentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Section: Indicators Of Habitat Qualitymentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Tree Pipit and Common Nightingale). These birds presumably consisted mostly of individuals that had no need for further energy reserves and had paused their migration to avoid adverse flight conditions such as high daytime temperatures (Bayly and Rumsey 2010;Salewski et al 2010;Schmaljohann et al 2007). A smaller proportion presumably had failed to accumulate sufficient reserves at more southerly stopover sites.…”

Section: Stopover Behaviour On Spring Migrationmentioning

confidence: 99%

“…While some species will stopover in the Sahel before crossing the Sahara (Ottosson et al 2001), others are thought to fatten further south (Bayly and Rumsey 2010;Ottosson et al 2005). In the past, species stopping over in the Sahel may have been impacted by the well-documented relationship between drought in the Sahel region and population declines in a range of migratory species (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fuelling for the Sahara crossing: variation in site use and the onset and rate of spring mass gain by 38 Palearctic migrants in the western Sahel

Bayly¹,

Atkinson

Rumsey³

2012

J Ornithol

Self Cite

View full text Add to dashboard Cite

To African-Palearctic migratory birds that spend the non-breeding season in sub-Saharan Africa, the Sahara desert is an ecological barrier that must be crossed using large energy reserves stored at stopover sites either side. Given the coincidence of spring migration with the height of the dry season in the west African Sahel, spring stopover conditions may be a limiting factor that regulates populations. By determining where, when and how reserves are accumulated prior to crossing the desert, we can identify possible population regulation mechanisms in Palearctic migrants and effectively target stopover sites for protection. We present data on the non-breeding season use of Djoudj National Park in the western Sahel by 38 Palearctic migrants based on constant effort mist-netting data. Twenty-four species showed evidence of using Djoudj either throughout the nonbreeding period or during spring migration. The remaining 14 species were largely absent from Djoudj and presumably accumulated energy reserves for spring migration south of the Sahel. Species preparing for spring migration at Djoudj began increasing their energy reserves in January or February. Energy reserves were generally accumulated at slow rates during long stopovers, and in all species examined, predicted take-off fuel loads were sufficient to cross the Sahara desert under certain conditions. Three species, Common Redstart Phoenicurus phoenicurus, Common Whitethroat Sylvia communis and Common Blackcap Sylvia atricapilla, achieved faster rates and had concurrently lower stopover durations. We predict that vulnerability to fluctuating environmental conditions in the Sahel region is greater in species that initiate fuelling later in the spring and in species with short stopover durations.

show abstract

“…The phenology of migration and body mass patterns of Garden Warblers at Malamfatori (Sahel zone of Northern Nigeria) and Amurum (Guinea savanna zone of Nigeria) has been reported by Ottosson et al (2005). Also, data from previous studies have shown that the species does not spend the winter in the Sahel and Guinea Savanna (Ottosson et al 2005, Smith 2007, Bayly & Rumsey 2010. Thus, drawing from these published works, it is clear that during the autumn passage, and after a few months in the Guinea savanna region of Nigeria, Garden Warblers embark on a new leg of migration, presumably to their final wintering quarters.…”

Section: Discussionmentioning

confidence: 83%

The stopover behaviour of the Garden Warbler Sylvia borin in Obudu, southeast Nigeria

Iwajomo¹,

Ottosson²,

Barshep

et al. 2011

Ornis Svec

View full text Add to dashboard Cite

The Garden Warbler breeds in the Palaearctic and migrates to sub-Saharan Africa for the non-breeding season. We studied its passage, body mass and moult at the Obudu Plateau in southeast Nigeria in October–December 2005 and December 2007–January 2008. In Nigeria, Garden Warblers in the Guinea savanna have been shown to increase body mass in October–November, preparing for migration to wintering sites further south. They begin to arrive at Obudu from mid-October and the numbers gradually increase with time; median date of passage was 3 December. This influx is clearly different from that which has been recorded for other sites in West Africa. The patterns in wing length and size-corrected body mass of individuals suggest a difference in the migration time of individuals of different sizes in the two years. Average fuel loads were lower at Obudu than has been reported in Central Nigeria. This, and the capture of moulting individuals, suggests that Garden Warblers may not embark on a longer journey southwards in mid winter, and possibly may even winter at Obudu.

show abstract

Garden WarblerSylvia borinmigration in sub‐Saharan West Africa

Cited by 9 publications

References 11 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

Fuelling for the Sahara crossing: variation in site use and the onset and rate of spring mass gain by 38 Palearctic migrants in the western Sahel

The stopover behaviour of the Garden Warbler Sylvia borin in Obudu, southeast Nigeria

Contact Info

Product

Resources

About