| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9pc2tc2w |
| Type |
Text |
| Description |
Records committee review for a Lesser Black-backed Gull at Red Rock Dam in Marion County, IA on October 5, 1989. Includes a record review document with votes and four documentation forms submitted to the committee. |
| Related Genres |
Administrative records Field notes |
| Sort Date |
1989-10-05 - 1993-08-06 |
| People / Organizations |
|
| Time |
3:10 PM |
| Rights |
This complex item has mixed rights protection. Portions in which Iowa State University is the copyright holder are made available for non-commercial use, including sharing and adapting the work. No permission is required for non-commercial use to these portions so long as attribution is provided. All other uses of these portions, including commercial, require permission from the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). (CC BY-NC 4.0 International). Portions in which Iowa State University is not the copyright holder are believed to be under copyright, but either (a) no rights-holder(s) have been identified or (b) one or more rights-holder(s) have been identified but none have been located. If you have any information that can contribute to identifying or locating the rights-holder(s) please notify the Iowa State University Library Digital Initiatives Program (digital@iastate.edu). (Rightsstatements.org InC-RUU 1.0). The original object is available at the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). |
| Data Access Rights |
http://vertnet.org/resources/norms.html |
| Data License |
http://creativecommons.org/publicdomain/zero/1.0 |
| Collection |
Iowa Ornithologists' Union | MS 166 |
| Box |
11 |
| Folder |
5 |
| Contributing Institution |
Iowa State University Library Special Collections and University Archives |
| Creator / Author |
Johnson, Ann |
| Contributors |
Cummins, Raymond L. Sinclair, Jim Iowa Ornithologists' Union Records Committee Fuller, James L |
| Topics |
Bird watching Ornithology Ornithology--Societies, etc |
| Birds |
Lesser Black-backed Gull |
| Locations |
Red Rock Dam |
| Map |
|
| Verbatim Locality |
Below Red Rock Dam, near Pella, Marion Co., IA |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
River with numerous sand and gravel bars |
| Extent |
8 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
The documentation form by Ann Johnson forms the basis of this record. Other documentation forms by Jim Sinclair, Raymond Cummins, and James Fuller were submitted. Other observers include Marlys Huff, David Youngblut, Pete Wickham, John Daniel, and Ken Lowder. | Elimination of similar species: Great Black-backed Gull- The bird was not large enough nor was the bill as massive. The great black-backed should also show a whiter head and lighter inner primaries and the back would be more of a checkerboard than the scaliness of this bird. Herring Gull- Because of variability, eliminating the herring was more problematic. Size was not particularly helpful initially in that this bird was near the second-year herring gull for such a brief time that I really couldn't make comparison. The variable sizes of ring-bills were of no help because next to some it looked huge and next to others it was only some larger. Some subtle differences were helpful in making this bird "look different" but I don't believe they could be considered sufficient. The checkered, scaly look was more pronounced than most juvenile herrings. The wings seemed long as they extended beyond the tail. The bill was entirely black and the tail band more distinct than most juvenile herrings. The color distinction between the head/tail and body from a distance were also helpful. The clincher, however, was during flight when no "windows" were visible on the inner primaries and the dark secondary coverts created a wide, dark trailing edge to the wing. These flight indicators, as well as size differential, were confirmed on the 23 October sighting. | The original documentation form event lasted from 15:10:00/16:00:00 and 16:15:00/16:40:00. |
| Occurrence Status |
present |
| Field Number |
1989-48 |
| Event Remarks |
Viewing Conditions: The bird was an estimated 150 - 200 yards away, a bit further than that in flight. The sky was totally overcast. Optical equipment consisted of 7x26 binoculars for observation during flight and a scope at 30x-50x while the bird was sitting. |
| Supporting Documentation |
National Geographic Society. National geographic field guide to the birds of North America. Washington D.C.: National Geographic Society. | Farrand J. The Audubon society master guide to birding, vol. 2, gulls to dippers. New York: Alfred A. Knopf, Inc. | Harrison P. Seabirds: an identification guide. New York: Houghton Mifflin Harcourt. |
| Date Digital |
01 Jun 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed |
