Lawrence Igl, PhD (Former Employee)
Science and Products
Filter Total Items: 121
A retrospective perspective: evaluating population changes by repeating historic bird surveys A retrospective perspective: evaluating population changes by repeating historic bird surveys
Acquiring an accurate picture of the changes in bird populations often involves a tradeoff between the time and effort required to complete the surveys and the number of years spent surveying the bird populations. An alternative approach to long-term monitoring efforts is to collect current data and contrast those with data collected earlier in a similar fashion on the same study site(s)...
Authors
Lawrence Igl, Douglas Johnson
Inter-species variation in yolk steroid levels and a cowbird-host comparison Inter-species variation in yolk steroid levels and a cowbird-host comparison
We examined variability in yolk hormone levels among songbird species and the role of yolk steroids as a mechanism for enhanced exploitation of hosts by the parasitic Brown-headed Cowbird Molothrus ater. Within-clutch variation in yolk steroids has been found in several avian species in single species studies, but few comparisons have been made among species. We found a large range of...
Authors
D. Caldwell Hahn, Jeffrey S. Hatfield, Mahmoud Abdelnabi, Julie Wu, Lawrence Igl, Mary A. Ottinger
[Book review] The quintessential companion for North American birders, by Christopher W. Leahy [Book review] The quintessential companion for North American birders, by Christopher W. Leahy
Book review: The Birdwatcher’s Companion to North American Birdlife. Christopher W. Leahy. 2004. Princeton University Press, Princeton, NJ. 1039 pages. $39.50 (cloth).
Authors
L.D. Igl
Historical and recent records and first nest records of Henslow's sparrow in North Dakota Historical and recent records and first nest records of Henslow's sparrow in North Dakota
The northwestern limit of the Henslow's sparrow (Ammodramus henslowii) breeding distribution occurs in southern Minnesota and central Wisconsin. In North Dakota, observations of Henslow's sparrows are reported infrequently, and there are no published nest records in the state. Herein, we summarize and review previous reports of Henslow's sparrows in North Dakota and document the first...
Authors
Jill Shaffer, Lawrence Igl, Frederick Vanhove
Male Brown-headed Cowbird Attacks and Kills a Nestling Male Brown-headed Cowbird Attacks and Kills a Nestling
I observed a male Brown-headed Cowbird (Molothrus ater) attack and kill a nestling of an unidentified passerine in a grassland field in Day County, South Dakota, in June 2000. The killing or removal of nestlings by female cowbirds has been reported by others, but this behavior has not been documented previously in male cowbirds.
Authors
L.D. Igl
A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002 A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002
The Bufflehead Bucephala albeola breeds predominantly in Canada and Alaska (USA). Evidence suggests that the species may have recently expanded its breeding range southward into central and south central North Dakota. This paper presents data on observations of Buffleheads during the breeding season in Kidder County, North Dakota, 1994-2002, and discusses the possibility that the species...
Authors
L.D. Igl
Science and Products
Filter Total Items: 121
A retrospective perspective: evaluating population changes by repeating historic bird surveys A retrospective perspective: evaluating population changes by repeating historic bird surveys
Acquiring an accurate picture of the changes in bird populations often involves a tradeoff between the time and effort required to complete the surveys and the number of years spent surveying the bird populations. An alternative approach to long-term monitoring efforts is to collect current data and contrast those with data collected earlier in a similar fashion on the same study site(s)...
Authors
Lawrence Igl, Douglas Johnson
Inter-species variation in yolk steroid levels and a cowbird-host comparison Inter-species variation in yolk steroid levels and a cowbird-host comparison
We examined variability in yolk hormone levels among songbird species and the role of yolk steroids as a mechanism for enhanced exploitation of hosts by the parasitic Brown-headed Cowbird Molothrus ater. Within-clutch variation in yolk steroids has been found in several avian species in single species studies, but few comparisons have been made among species. We found a large range of...
Authors
D. Caldwell Hahn, Jeffrey S. Hatfield, Mahmoud Abdelnabi, Julie Wu, Lawrence Igl, Mary A. Ottinger
[Book review] The quintessential companion for North American birders, by Christopher W. Leahy [Book review] The quintessential companion for North American birders, by Christopher W. Leahy
Book review: The Birdwatcher’s Companion to North American Birdlife. Christopher W. Leahy. 2004. Princeton University Press, Princeton, NJ. 1039 pages. $39.50 (cloth).
Authors
L.D. Igl
Historical and recent records and first nest records of Henslow's sparrow in North Dakota Historical and recent records and first nest records of Henslow's sparrow in North Dakota
The northwestern limit of the Henslow's sparrow (Ammodramus henslowii) breeding distribution occurs in southern Minnesota and central Wisconsin. In North Dakota, observations of Henslow's sparrows are reported infrequently, and there are no published nest records in the state. Herein, we summarize and review previous reports of Henslow's sparrows in North Dakota and document the first...
Authors
Jill Shaffer, Lawrence Igl, Frederick Vanhove
Male Brown-headed Cowbird Attacks and Kills a Nestling Male Brown-headed Cowbird Attacks and Kills a Nestling
I observed a male Brown-headed Cowbird (Molothrus ater) attack and kill a nestling of an unidentified passerine in a grassland field in Day County, South Dakota, in June 2000. The killing or removal of nestlings by female cowbirds has been reported by others, but this behavior has not been documented previously in male cowbirds.
Authors
L.D. Igl
A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002 A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002
The Bufflehead Bucephala albeola breeds predominantly in Canada and Alaska (USA). Evidence suggests that the species may have recently expanded its breeding range southward into central and south central North Dakota. This paper presents data on observations of Buffleheads during the breeding season in Kidder County, North Dakota, 1994-2002, and discusses the possibility that the species...
Authors
L.D. Igl