Integrated Analysis of Genetic, Stable Isotope, and Banding Data Reveal Migratory Connectivity and Flyways in the Northern Yellow Warbler (Dendroica petechia; Aestiva group)

2006 ◽  
pp. 29-78 ◽  
Author(s):  
Marylène Boulet ◽  
H. Lisle Gibbs ◽  
Keith A. Hobson
Keyword(s):  
Stable Isotope ◽  
Integrated Analysis ◽  
Migratory Connectivity ◽  
Dendroica Petechia ◽  
Yellow Warbler

Yellow Warbler (Dendroica petechia)

1999 ◽  
Author(s):  
Peter E. Lowther ◽  
C. Celada ◽  
N. K. Klein ◽  
Christopher C. Rimmer ◽  
D. A. Spector
Keyword(s):  
Dendroica Petechia ◽  
Yellow Warbler

scholarly journals Diets of Insectivorous Birds Along the Colorado River in Grand Canyon, Arizona

The Condor ◽  
2004 ◽  
Vol 106 (1) ◽  
pp. 106-115 ◽  
Author(s):  
Helen K. Yard ◽  
Charles Van Riper ◽  
Bryan T. Brown ◽  
Michael J. Kearsley
Keyword(s):  
Colorado River ◽  
Bird Species ◽  
Grand Canyon ◽  
Dendroica Petechia ◽  
Tamarix Chinensis ◽  
Vegetation Zone ◽  
Yellow Warbler ◽  
Icteria Virens ◽  
Del Rio ◽  
Prey Items

Abstract We examined diets of six insectivorous bird species (n = 202 individuals) from two vegetation zones along the Colorado River in Grand Canyon National Park, Arizona, 1994. All bird species consumed similar quantities of caterpillars and beetles, but use of other prey taxa varied. Non-native leafhoppers (Opsius stactagolus) specific to non-native tamarisk (Tamarix chinensis) substantially augmented Lucy's Warbler (Vermivora luciae) diets (49%), while ants comprised 82% of Yellow-breasted Chat (Icteria virens) diets. Yellow Warbler (Dendroica petechia) diets were composed of 45% aquatic midges. All bird species consumed the non-native leafhopper specific to tamarisk. Comparison of bird diets with availability of arthropod prey from aquatic and terrestrial origins showed terrestrial insects comprised 91% of all avian diets compared to 9% of prey from aquatic origin. Seasonal shifts in arthropod prey occurred in diets of three bird species, although no seasonal shifts were detected in arthropods sampled in vegetation indicating that at least three bird species were not selecting prey in proportion to its abundance. All bird species had higher prey overlap with arthropods collected in the native, mesquite-acacia vegetation zone which contained higher arthropod diversity and better prey items (i.e., Lepidoptera). Lucy's Warbler and Yellow Warbler consumed high proportions of prey items found in greatest abundance in the tamarisk-dominated vegetation zone that has been established since the construction of Glen Canyon Dam. These species appeared to exhibit ecological plasticity in response to an anthropogenic increase in prey resources. Dieta de Aves Insectívoras a lo largo del Río Colorado en el Gran Cañon, Arizona Resumen. Examinamos la dieta de seis especies de aves insectívoras (n = 202 individuos) de dos zonas de vegetación a lo largo del Río Colorado en el Parque Nacional del Gran Cañon, Arizona, en 1994. Todas las especies de aves consumieron cantidades similares de orugas y escarabajos, pero el uso de otras presas fue variable. Los Cicadellidae (Homóptera) exóticos (Opsius stactagolus) específicos del tamarisco exótico (Tamarix chinensis) comprendieron una parte sustancial de la dieta de Vermivora luciae (49%), mientras que las hormigas representaron el 82% de la dieta de Icteria virens. La dieta de Dendroica petechia incluyó un 45% de dípteros acuáticos de la familia Cecidomyiidae. Todas las especies de aves consumieron el cicadellide exótico específico del tamarisco. La comparación de las dietas de aves con la disponibilidad de presas de artrópodos de origen acuático y terrestre mostró que los insectos terrestres comprendieron el 91% de todas las dietas de aves, comparado con un 9% de presas de origen acuático. Se registraron cambios estacionales en los artrópodos de la dieta de tres especies de aves, aunque no se detectaron cambios estacionales en los artrópodos muestreados en la vegetación, indicando que al menos tres especies de aves no estuvieron seleccionando las presas en proporción a su abundancia. Todas las especies de aves presentaron mayor superposición de presas con los artrópodos colectados en la zona de vegetación nativa de mesquite (Prosopis) y Acacia, la cual contuvo mayor diversidad de artrópodos y presas de mejor calidad (i.e., Lepidoptera). V. luciae y D. petechia consumieron altas proporciones de presas encontradas en mayor abundancia en la zona de vegetación dominada por el tamarisco, que ha sido establecida desde la construcción de la Presa Glen Canyon. Estas especies parecieron exhibir plasticidad ecológica en respuesta a un incremento antropogénico en las presas como recuso alimenticio.

Unraveling migratory connectivity of two European diving ducks: a stable isotope approach

2016 ◽  
Vol 62 (6) ◽  
pp. 701-711 ◽  
Author(s):  
Alain Caizergues ◽  
Steven L. Van Wilgenburg ◽  
Keith A. Hobson
Keyword(s):  
Stable Isotope ◽  
Migratory Connectivity ◽  
Diving Ducks

scholarly journals Breeding origins and migratory connectivity at a northern roost of Vaux’s Swift, a declining aerial insectivore

The Condor ◽  
2019 ◽  
Vol 121 (3) ◽  
Author(s):  
Ellis L Smith ◽  
Matthew W Reudink ◽  
Peter P Marra ◽  
Ann E Mckellar ◽  
Steven L Van Wilgenburg
Keyword(s):  
Stable Isotope ◽  
Annual Cycle ◽  
Isotope Analysis ◽  
Vancouver Island ◽  
Cluster Solution ◽  
Migratory Connectivity ◽  
Breeding Sites ◽  
Aerial Insectivores ◽  
Breeding Grounds ◽  
Weak Connectivity

ABSTRACT Populations of Vaux’s Swift (Chaetura vauxi), like those of many aerial insectivores, are rapidly declining. Determining when and where populations are limited across the annual cycle is important for their conservation. Establishing the linkages between wintering and breeding sites and the strength of the connections between them is a necessary first step. In this study, we analyzed 3 stable isotopes (δ13C, δ15N, δ2H) from feathers collected during spring migration from Vaux’s Swifts that perished during a stopover on Vancouver Island, British Columbia, Canada. We previously analyzed claw tissue (grown during winter) from the same individuals, revealing that the swifts likely wintered in 2 or 3 locations/habitats. Here, we used stable isotope analysis of flight feathers presumed to have been grown on, or near, the breeding grounds to determine the likely previous breeding locations and presumed destinations for the swifts. Stable isotope values (δ13C, δ15N, δ2H) showed no meaningful variation between age classes, sexes, or with body size. Surprisingly, ~26% of the birds sampled had feather isotope values that were not consistent with growth on their breeding grounds. For the remaining birds, assigned breeding origins appeared most consistent with molt origins on Vancouver Island. Overall, migratory connectivity of this population was relatively weak (rM = 0.07). However, the degree of connectivity depended on how many winter clusters were analyzed; the 2-cluster solution suggested no significant connectivity, but the 3-cluster solution suggested weak connectivity. It is still unclear whether low migratory connectivity observed for Vaux’s Swift and other aerial insectivores may make their populations more or less vulnerable to habitat loss; therefore, further efforts should be directed to assessing whether aerial insectivores may be habitat limited throughout the annual cycle.

scholarly journals Wintering Areas, Migratory Connectivity and Habitat Fidelity of Three Declining Nearctic- Neotropical Migrant Swallows

2018 ◽  
Vol 5 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Tara Leah Imlay ◽  
Keith A. Hobson ◽  
Amélie Roberto-Charron ◽  
Marty L. Leonard
Keyword(s):  
Stable Isotope ◽  
North America ◽  
South America ◽  
Migratory Connectivity ◽  
Population Declines ◽  
Winter Habitat ◽  
Aerial Insectivores ◽  
Wintering Areas ◽  
Barn Swallows ◽  
Habitat Fidelity

Abstract Conservation efforts directed at population declines for migratory animals must consider threats occurring at different stages often separated by vast distances. Furthermore, connectivity between populations and fidelity of individuals to specific habitats during the annual cycle are also important considerations. Avian aerial insectivores are experiencing steep population declines in North America, and those declines may be driven, in part, by conditions on the wintering grounds. Here, using geolocators (2 species; 4 individuals) and stable isotope (δ2H, δ13C and δ15N) measurements of feathers (3 species; 841 individuals), we identified approximate winter areas, and assessed migratory connectivity and among-year winter habitat fidelity for three aerial insectivores (Bank Swallow Riparia riparia, Barn Swallow Hirundo rustica and Cliff Swallow Petrochelidon pyrrhonota) that breed in northeastern North America. All three species of swallows are declining in this region. Our results, largely from the stable isotope analysis, suggest that these species likely winter throughout the Cerrado, La Plata Basin, and the Pampas, in South America. These most likely areas were similar among years (2013-2016) for Bank and Cliff Swallows, but varied for Barn Swallows (2014-2016). We found weak migratory connectivity for all three species, and, with one exception, weak habitat fidelity among years for individuals. For individual Barn Swallows captured in two or more years, we found high repeatability in δ13C values, suggesting some fidelity to similar habitats among years. The most likely wintering areas for these species coincide with large areas of South America experiencing high rates of land-use change.

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