On the Occurrence of Eastern Wood Warblers in Western North America

Austin, George T.

doi:10.2307/1366667

Cited by 8 publications

(4 citation statements)

References 12 publications

(10 reference statements)

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“…The initial invasion of an area generally involves low numbers of individuals, many of which are juveniles (Lack 1954;Root 1962;Austin 1971). Only slightly more males in the small founder population I studied were ASY males.…”

Section: Discussionmentioning

confidence: 96%

Breeding biology of Orchard Orioles in a new population in Manitoba

Sealy

1980

The Canadian Field-Naturalist

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The Orchard Oriole (/cterus spurius) was first recorded possibly breeding on the Delta Beach Ridge, Manitoba, in 1975, and from 1976 a small population produced young each year. Adult and yearling males arrived at the same time in spring. Both age classes of males nested equally successfully, and both returned to nest ina later year. No females, nor young reared on the study area, are known to have returned. The family units stayed together until departure in late summer. Division of labor by parents feeding young apparently occurred. Adults did not molt on the breeding ground prior to migrating in fall.

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Section: Discussionmentioning

confidence: 96%

Breeding biology of Orchard Orioles in a new population in Manitoba

Sealy

1980

The Canadian Field-Naturalist

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“…In addition, it is quite possible that young birds on the coast may be due to one phenomenon, and the occurrence of vagrants might be associated with a different phenomenon. For example, Austin (1971) found that migrants which breed east of the Rockies typically occur approximately three weeks later in migration than migration dates in the east. A high percentage of these lost vagrants were immature.…”

Section: Discussionmentioning

confidence: 99%

“…Mirror-image misorientation theory accounts for observations made by DeSante (1983a) that in certain situations large-angle misorientations seem more frequent than small or intermediate deviations from the normal migration course (Alerstam, 1990). Misorientation by the wind has long been suggested as a cause of accidentals (Austin, 1971), but Thorup et al (2012) found differently, as the authors used radio telemetry to track individual migratory flights of several species of songbirds from the Faroe Islands, approximately halfway between Norway and Iceland, far west of their normal migration route. Birds with expected easterly and south-easterly migration direction departed westward out over the Atlantic Ocean, indicating that these birds are actively flying in the “wrong” direction and that their occurrence is not caused by wind drift.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting the distribution and abundance of autumn vagrant New World warblers in northwestern California and southern Oregon

Ralph

Wolfe

2018

PeerJ

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Birds found outside their typical range, or vagrants, have fascinated naturalists for decades. Despite broad interest in vagrancy, few attempts have been made to statistically examine the explanatory variables potentially responsible for the phenomenon. In this study, we used multiple linear regression to model the occurrence of 28 rare warbler species (family Parulidae) in autumn in northern California and southern Oregon as a function of migration distance, continental population size, distance, and bearing to both closest breeding population and breeding population center. In addition to our predictive model, we used capture data from the California coast to 300 km inland to examine relationships between the presence of vagrant warblers, regional warbler species richness and age class distribution. Our study yielded three important results: (1) vagrancy is strongly correlated with larger North American population size; (2) vagrants are more common at some coastal sites; and (3) where young birds are over-represented, vagrants tend to occur—such as on the coast and at far inland sites. Of the many explanations of rare and vagrant individuals, we feel that the most likely is that these birds represent the ends of the distributions of a normal curve of migration direction, bringing some few migrants to locations out of their normal migratory range as vagrants. We also examine the underrepresented species that, according to our model, are overdue for being recorded in our study area.

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“…In addition, it is quite possible that young on the coast may be due to one phenomenon, and the occurrence of vagrants might also be related to this, but not entirely. For example, Austin (1971) found that migrants which breed east of the Rockies typically occur three weeks or so later in migration than migration dates in the east. A high percentage of these lost vagrants are immature.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting the distribution and abundance of autumn vagrant warblers in northwestern California and southern Oregon

Ralph

Wolfe

2018

Preprint

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Birds found outside their typical range, or vagrants, have fascinated naturalists for decades. Despite broad interest in vagrancy, few attempts have been made to statistically examine the explanatory variables potentially responsible for the phenomenon. In this study, we used multiple linear regression to model the occurrence of 28 rare warbler species (family Parulidae) in autumn in northern California and southern Oregon as a function of migration distance, continental population size, distance, and bearing to both closest breeding population and breeding population center. In addition to our predictive model, we used capture data from the California coast to 300 km inland to examine relationships between the presence of vagrant warblers, regional warbler species richness and age class distribution. Our study yielded three important results: (1) vagrancy is strongly correlated with larger North American population size and secondarily by longer migration distance; (2) vagrants are more common at some coastal sites; and (3) where young birds are over-represented, vagrants tend to occur – such as on the coast and at far inland sites. Of the many explanations of rare and vagrant individuals, we feel that the most likely is that these birds represent the ends of the distributions of a normal curve of migration direction, bringing some few migrants to locations out of their normal migratory range as vagrants. We also examine the underrepresented species that, according to our model, are overdue for being recorded in our study area.

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On the Occurrence of Eastern Wood Warblers in Western North America

Cited by 8 publications

References 12 publications

Breeding biology of Orchard Orioles in a new population in Manitoba

Breeding biology of Orchard Orioles in a new population in Manitoba

Factors affecting the distribution and abundance of autumn vagrant New World warblers in northwestern California and southern Oregon

Factors affecting the distribution and abundance of autumn vagrant warblers in northwestern California and southern Oregon

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