Timing of feather molt related to date of spring migration in male white-throated sparrows,Zonotrichia albicollis

AbstractRed Kite shows a great variability in its migration strategies: most individuals in north-eastern Europe are migrants, but there is also a growing number of sedentary individuals. Here, we tagged 49 Red Kites wintering in Spain with GPS/satellite transmitters between 2013 and 2020 to study the autumn and spring migration between the breeding or summering areas in Central Europe and the wintering quarters in Spain. In first place, differences between immatures and adults were found for spring migration. Adults began the spring migration towards the northeast in February–March while the immature individuals began to migrate significantly later and showing a wider date range (February-June). Adults also takes significantly less days to arrive at their destinations (12 ± 5 days) and cover more distance per day (134.2 ± 37.1 km/day) than immatures (19 ± 11 days and 98.9 ± 21.2 km/day). In second place, we also found differences between spring and autumn migration (excluding immatures). Spring migrations were clearly faster and with less stopovers days than autumn migrations. Autumn migration began between mid-October and late November and two different behaviours were observed: most birds made a quick migration direct to the wintering areas with only some days of stopovers, but others prolonged the migration with long stops along the route. These results highlight a great variation in the migratory movements of Red Kite, not only according to age but also between individuals and seasons.

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Geolocators reveal migration routes, stopover sites, and nonbreeding dispersion in a population of Cerulean Warblers

Animal Migration ◽

10.1515/ami-2020-0003 ◽

2020 ◽

Vol 7 (1) ◽

pp. 19-26

Author(s):

Clayton D Delancey ◽

Kamal Islam ◽

Gunnar R Kramer ◽

Garrett J MacDonald ◽

Alexander R Sharp ◽

...

Keyword(s):

Gulf Of Mexico ◽

Spring Migration ◽

Autumn Migration ◽

Migration Routes ◽

Neotropical Migrant ◽

Wood Warblers ◽

Before And After ◽

The Caribbean ◽

Declining Species ◽

Cerulean Warblers

AbstractCerulean Warblers (Setophaga cerulea) are among the fastest declining Nearctic-Neotropical migrant wood-warblers (Parulidae) in North America. Despite ongoing conservation efforts, little is known about their non-breeding distribution. In June 2016-2018, we deployed geolocators (n = 30) on adult male Cerulean Warblers in Indiana, USA, to track annual movements of individuals. Recovered geolocators (n = 4) showed that Cerulean Warblers occurred broadly throughout northern South America. Autumn migration lasted 44-71 days (n = 4), whereas spring migration lasted 37-41 days (n = 3). The average migration distance was 5268 km. During autumn migration, Cerulean Warblers made 1-4 stopovers (i.e., ≥2 days; n = 4) and 1-2 stopovers during spring migration (n = 3). When crossing the Gulf of Mexico during autumn migration, two birds stopped over after crossing, but not beforehand. Two others navigated through the Caribbean rather than crossing the Gulf of Mexico. During spring migration, one individual stopped after crossing, one individual stopped before crossing, and one individual stopped before and after crossing the Gulf of Mexico. No birds migrated through the Caribbean Islands during spring migration. These results represent novel information describing annual movements of individual Cerulean Warblers and will inform conservation efforts for this declining species.

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Boreal Forest Songbird Communities of the Liard Valley, Northwest Territories, Canada

The Condor ◽

10.1093/condor/105.1.27 ◽

2003 ◽

Vol 105 (1) ◽

pp. 27-44 ◽

Cited By ~ 2

Author(s):

Craig S. Machtans ◽

Paul B. Latour

Keyword(s):

Boreal Forest ◽

Northwest Territories ◽

Boreal Forests ◽

Bird Community ◽

Deciduous Forests ◽

Zonotrichia Albicollis ◽

Catharus Ustulatus ◽

Regional Patterns ◽

Dendroica Coronata ◽

Spizella Passerina

Abstract Songbird communities in the boreal forest of the Liard Valley, Northwest Territories, Canada, are described after three years of study. Point count stations (n = 195) were placed in six types of forest (mature deciduous, coniferous, and mixedwood; young forests; wooded bogs; clearcuts) in a 700-km2 area. Vegetation characteristics at each station were also measured. Eighty-five species of birds (59 passerine species) occurred in 11 647 detections. Mixedwood forests had the highest richness of songbirds (∼41 species per 800 individuals) of the six forest types, and contained approximately 30% more individuals than nearly pure coniferous or deciduous forests. Species richness and relative abundance was 10–50% lower than in comparable forests farther south and east, and the difference was most pronounced in deciduous forests. Communities were dominated by a few species, especially Tennessee Warbler (Vermivora peregrina), Magnolia Warbler (Dendroica magnolia), Swainson's Thrush (Catharus ustulatus), Yellow-rumped Warbler (Dendroica coronata) and Chipping Sparrow (Spizella passerina). White-throated Sparrow (Zonotrichia albicollis), a dominant species in boreal forests farther south, was notably scarce in all forests except clearcuts. Clearcuts and wooded bogs had the simplest communities, but had unique species assemblages. Canonical correspondence analysis showed that the bird community was well correlated with vegetation structure. The primary gradient in upland forests was from deciduous to coniferous forests (also young to old, respectively). The secondary gradient was from structurally simple to complex forests. These results allow comparisons with other boreal areas to understand regional patterns and help describe the bird community for conservation purposes. Comunidades de Aves Canoras de Bosques Boreales del Valle de Liard, Territorios del Noroeste, Canadá Resumen. Luego de tres años de estudio, se describen las comunidades de aves canoras de bosques boreales del Valle de Liard, Territorios del Noroeste, Canadá. Se ubicaron estaciones de conteo de punto (n = 195) en seis tipos de bosque (maduro caducifolio, conífero y de maderas mixtas; bosques jóvenes; pantanos arbolados; zonas taladas) en un área de 700 km2. Las características de la vegetación en cada estación también fueron medidas. Se registraron 85 especies de aves (59 especies de paserinas) en 11 647 detecciones. Los bosques mixtos presentaron la mayor riqueza de aves canoras (∼41 especies por 800 individuos) de los seis tipos de bosque, y contuvieron aproximadamente 30% individuos más que los bosques de coníferas y los caducifolios. La riqueza de especies y la abundancia relativa fue 10–50% menor que en bosques comparables más al sur y al este, y la diferencia fue más pronunciada en los bosques caducifolios. Las comunidades estuvieron dominadas por unas pocas especies, especialmente Vermivora peregrina, Dendroica magnolia, Catharus ustulatus, Dendroica coronata y Spizella passerina. Zonotrichia albicollis, una especie dominante en bosques boreales más al sur, fue notablemente escasa en todos los bosques, excepto en las zonas taladas. Las áreas taladas y los pantanos arbolados tuvieron las comunidades más simples, pero presentaron ensamblajes únicos. Análisis de correspondencia canónica mostraron que la comunidad de aves estuvo bien correlacionada con la estructura de la vegetación. El gradiente primario en bosques de zonas altas fue de bosque caducifolio a conífero (también de joven a viejo, respectivamente). El gradiente secundario fue de bosques estructuralmente simples a bosques complejos. Estos resultados permiten hacer comparaciones con otros bosques boreales para entender los patrones regionales y ayudar a describir las comunidades de aves con fines de conservación.

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Hepatic Element Concentrations of Lesser Scaup (Aythya affinis) During Spring Migration in the Upper Midwest

Archives of Environmental Contamination and Toxicology ◽

10.1007/s00244-010-9587-1 ◽

2010 ◽

Vol 61 (1) ◽

pp. 144-150 ◽

Cited By ~ 10

Author(s):

Angela E. Pillatzki ◽

Regg D. Neiger ◽

Steven R. Chipps ◽

Kenneth F. Higgins ◽

Nancy Thiex ◽

...

Keyword(s):

Spring Migration ◽

Upper Midwest ◽

Aythya Affinis ◽

Element Concentrations ◽

Lesser Scaup

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Changing Composition of a Redpoll Flock during Spring Migration

Bird-Banding ◽

10.2307/4511440 ◽

1968 ◽

Vol 39 (1) ◽

pp. 51 ◽

Cited By ~ 8

Author(s):

George C. West ◽

Leonard J. Peyton ◽

Susan Savage

Keyword(s):

Spring Migration

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Feeding Ecology of Sandhill Cranes during Spring Migration in Nebraska

Journal of Wildlife Management ◽

10.2307/3801490 ◽

1986 ◽

Vol 50 (1) ◽

pp. 71 ◽

Cited By ~ 33

Author(s):

Kenneth J. Reinecke ◽

Gary L. Krapu

Keyword(s):

Feeding Ecology ◽

Spring Migration ◽

Sandhill Cranes

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