| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9n29p913 |
| Type |
Text |
| Description |
Records Committee review for two Thayer's Gulls at Lake Manawa in Pottawattamie County, IA on March 19, 1981. Includes a record review document with votes, correspondence and comments about the sighting, an article in Iowa Bird Life, and four documentation forms submitted to the committee. |
| Related Genres |
Administrative records Clippings (information artifacts) Correspondence Field notes |
| Sort Date |
1981-03-19 - 1993-08-26 |
| People / Organizations |
|
| Time |
9:30 AM |
| 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 |
3 |
| Contributing Institution |
Iowa State University Library Special Collections and University Archives |
| Creator / Author |
Silcock, W. Ross |
| Contributors |
Kent, Thomas H. (Thomas Hugh), 1934- Paulson, Dennis R. Dunn, Jonathan L. Lehman, Paul Myers, Robert K. Newlon, Michael C. Petersen, Peter C. Wahl, Terrence R. Iowa Ornithologists' Union Records Committee |
| Topics |
Bird watching Ornithology Ornithology--Societies, etc |
| Birds |
Thayer's Gull |
| Locations |
Lake Manawa |
| Map |
|
| Verbatim Locality |
Lake Manawa, Pottawattamie County, Iowa. |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
|
| Extent |
15 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
2 |
| Occurrence Remarks |
The documentation form by Ross Silcock is the earliest and the one that forms the basis of this record. Other documentation forms by Thomas H. Kent, Peter C. Petersen, and Robert K. Myers were submitted later. Other observers include Tom Shires, James Kovanda, Sandra Kovanda, Tanya Bray, Babs Padelford, Loren Padelford, B.J. Rose, and four unidentified other observers. | Elimination of similar species: The above description separates by direct comparison first-year Thayer's and Herring Gulls, the most similar species present. Thayer's may be confused in first year plumage with Kumlien's form of Iceland Gull, but the Thayer's had primaries slightly darker than the mantle (from above), whereas the opposite occurs in Iceland Gull (Lehman). Lehman also notes that some first-year Western Gulls may show translucent primaries from below in certain light, but these observations took place in excellent light at fairly close range. | The original documentation form event lasted from approximately 09:30:00/11:00:00. |
| Occurrence Status |
present |
| Field Number |
1981-06 |
| Event Remarks |
Viewing Conditions: Optical: Binoculars were 7 X 40 Bushnell, and telescope was Balscope Sr with 25X eyepiece. Distance: Birds loafing on the mudflats were about 50 yards from the car, while birds feeding in the nearby lagoons were between 50 and 200 yards from the car. Light: It was a bright, sunny day, perfect for viewing the birds feeding in the lagoons. The birds loafing on the mudflats were at a more difficult angle relative to the sun, but light was still very good, with no distortion or shadowing of the birds. |
| Supporting Documentation |
Lehman, P. Identification of Thayer's gulls. Birding. 1980;12(6);198-210 |
| Date Digital |
30 May 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed |
