| UID |
|
| Digital Object Type |
Rare birds documentation form |
| Content DM Link |
https://n2t.net/ark:/87292/w9cn6z19x |
| Type |
Text |
| Description |
Rare bird documentation form for a Great Black-backed Gull at Saylorville Reservoir in Polk County, IA on November 30, 1986 and December 1, 1986. |
| Related Genres |
Field notes |
| Sort Date |
1986-11-30 - 1986-12-01 |
| People / Organizations |
|
| Time |
4:00 PM |
| Rights |
This Item is protected by copyright and/or related rights. However, for this Item, 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 |
34 |
| Folder |
38 |
| Contributing Institution |
Iowa State University Library Special Collections and University Archives |
| Creator / Author |
Dinsmore, Stephen J. |
| Contributors |
Martsching, Paul |
| Topics |
Birds--Identification Ornithology Rare birds |
| Birds |
Great Black-backed Gull |
| Locations |
Saylorville Lake |
| Map |
|
| Verbatim Locality |
Saylorville Reservoir, Polk Co. (near visitors center) |
| Location Remarks |
The documentation forms do not include georeferences |
| Habitat |
large reservoir |
| Extent |
2 pages |
| Language(s) |
eng |
| Bibliographic Citation |
|
| Information Withheld |
|
| Individual Count |
1 |
| Occurrence Remarks |
The documentation form by Steve Dinsmore is the only one submitted and forms the basis of this record. Other observers include Paul Martsching. | Elimination of similar species: Second winter Herring Gull eliminated by size, bill size, lack of a gray mantle, lack of streaking on the head and underparts, lack of a window on the upperwing, by the all white tail with a dark band at the tip, and by the very dark underside of the primaries. Second winter Lesser Black-backed Gull eliminated by smaller size, browner uppertail, and heavily streaked head and underparts. | The original documentation form event lasted from 16:00:00/16:15:00 on November 30, 1986 and 15:55:00/16:08:00 on December 1, 1986. |
| Occurrence Status |
present |
| Field Number |
|
| Event Remarks |
Viewing Conditions: Viewing conditions were excellent with the sun mostly behind us and the sky cloudy. Estimated viewing distance was 75 yards at the closest. I used Nikon 8 x 23 binoculars and a Buschnell 20-45x spotting scope. |
| 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 |
11 Jan 2018 |
| File Type |
image/jpeg |
| Hardware / Software |
Epson - sheet feed |
