| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w92r3p05b |
| Type |
Text |
| Description |
Records Committee review for a Thayer's Gull at Lock and Dam 19 in Keokuk in Lee County, IA on December 21, 1986. Includes a record review document with votes, a summary of the review, and a documentation form submitted to the committee. |
| Related Genres |
Administrative records Field notes |
| Sort Date |
1986-12-21 - 1993-09-07 |
| People / Organizations |
|
| Time |
|
| 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 |
Cecil, Robert I. |
| Contributors |
Iowa Ornithologists' Union Records Committee |
| Topics |
Bird watching Ornithology Ornithology--Societies, etc |
| Birds |
Thayer's Gull |
| Locations |
Lock Number 19 |
| Map |
|
| Verbatim Locality |
Lock and Dam 19, Miss. River, Keokuk, Lee Co, Iowa |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
River rapids. |
| Extent |
4 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
The documentation form by Robert Cecil is the only one submitted and forms the basis of this record. Another observer includes Doug Reeves. | Elimination of similar species: First year Herring much more "contrasty"--see above. Kumlien's Iceland Gull...According to Seabirds (Harrison), 1st year Iceland is more pale, tail uniform gray. Overall body coloration is more like 1st year Glaucous--bird I saw was darker than 1st year Glaucous. [...] The important thing about this uniformity that the accompanying first year Herring Gulls had much contrast, showing whitish head, darker wingtips, dark at the tip of the underwings (sometimes), and most obviously, much darker secondaries, creating a dark trailing edge to the wings. Their general color was a darker chocolatey brown. [...] BILL: Pinkish--noticably [sic] smaller that [sic] Herrings. This is pretty subjective, but at about 2/3 of the way across the river at the dam (maybe one third mile) the bill on a Herring can be easily seen through my scope. [...] A very indistinct darkening (wing, upper surface) of the first two or three primaries. The mark had to be looked for to be seen--on the Herring it was much more evident. [...] At some times, the bird showed secondaries that were slightly darker than the rest of the wing. Slightly should be emphasized--at no time was it even close to the darkness of the secondaries of the first year Herring. [...] There was a very slight and indistinct darkening to the first two or three primaries, but this had to be looked for carefully. I have also seen a number of 1st year Herring Gulls that fit this description, but all have a distinct window at base of primaries. | The original documentation form event occurred at various times during the date range of sightings on the documentation form. |
| Occurrence Status |
present |
| Field Number |
1986-28 |
| Event Remarks |
Viewing Conditions: Viewing conditions and distances varied, but usually good to excellent. Minimum distance about 40 yds. Scope: 20x60 Nikon. Binocs 10x40 Zeiss. |
| Supporting Documentation |
Harrison P. Seabirds: an identification guide. New York: Houghton Mifflin Harcourt. | Bendorf C. Identification of first-winter Thayer's gull. Iowa Bird Life. 1986; 56; 71-73. | National Geographic Society. National geographic field guide to the birds of North America. Washington D.C.: National Geographic Society. | Peterson, RT. Peterson field guide to birds of North America. New York: Houghton Mifflin Harcourt. |
| Date Digital |
30 May 2017 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed |
