| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9cc0tw5h |
| Type |
Image, Text |
| Description |
Records Committee review for a Common Black-headed Gull at Cherry Glen Recreation Area at Saylorville Reservoir in Polk County, IA on November 2, 1989. Includes a record review document with votes, an article in Iowa Bird Life, photocopies of four photographs, and two documentation forms submitted to the committee. |
| Related Genres |
Administrative records Clippings (information artifacts) Field notes Photographs |
| Sort Date |
1989-11-02 - 1993-08-05 |
| People / Organizations |
|
| Time |
4:17 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 |
10 |
| Folder |
21 |
| Contributing Institution |
Iowa State University Library Special Collections and University Archives |
| Creator / Author |
Dinsmore, Stephen J. |
| Contributors |
Rose, B.J. Iowa Ornithologists' Union Records Committee |
| Topics |
Bird watching Ornithology Ornithology--Societies, etc |
| Birds |
Black-headed Gull |
| Locations |
Cherry Glen Recreation Area |
| Map |
|
| Verbatim Locality |
Saylorville Reservoir, Polk Co.-off Cherry Glen Rec. Area |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
large reservoir |
| Extent |
8 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
The documentation form by Steve Dinsmore is the earliest and the one that forms the basis of this record. Another documentation form by B.J. Rose was submitted later. Other observers include Doug Rose, Roger Rose, and Ken Lowder. | Elimination of similar species: Because of the fairly small size and conspicuous dark spot behind each eye, the bird must have been a Bonaparte's, Little, Common Black-headed, or Ross' gull, or a kittiwake. Separation from Bonaparte's Gull is discussed above. Little Gull eliminated by its smaller size, dark bill, lack of any black color on the upperwing, and uniformly dark underside to the flight feathers. Ross' Gull eliminated by tail shape, bill size and color, and darker underwing. Both kittiwakes eliminated by bill color, lighter mantle color, and differences in wing pattern. | The original documentation form event lasted from 16:17:00/16:42:00. |
| Occurrence Status |
present |
| Field Number |
1989-39 |
| Event Remarks |
Viewing Conditions: Viewing conditions were excellent with the sun behind me for most of the observation and mostly clear skies. Estimated viewing distance was as close as 75 yards, but about 75-100 yards when the bird was in flight. I used a Buschnell 20-45x spotting scope and Buschnell 7x35 binoculars. |
| Supporting Documentation |
National Geographic Society. National geographic field guide to the birds of North America. Washington D.C.: National Geographic Society. | Grant, PJ. Gulls: a guide to identification. Cambridge, MA: Academic Press. |
| Date Digital |
26 May 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed/flatbed |
