UID
Digital Object Type Rare birds documentation form
Content DM Link https://n2t.net/ark:/87292/w9rf5kh7n
Type Text
Description Rare bird documentation form for a Long-tailed Duck at Lake Manawa in Pottawattamie County, IA on October 24, 1988.
Related Genres Field notes
Sort Date 1988-10-24 - 1988-10-27
People / Organizations
Time 10:15 AM
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 33
Folder 14
Contributing Institution Iowa State University Library Special Collections and University Archives
Creator / Author Grenon, Alan G.
Contributors Green, Ruth Padelford, Babs Padelford, Loren Wetteroth, Bruce Grenon, Elizabeth A.
Topics Birds--Identification Ornithology Rare birds
Birds Long-tailed Duck
Locations Lake Manawa
Map
Verbatim Locality west-central part of Lake Manawa, Pottawattamie County, Iowa
Location Remarks The documentation forms do not include georeferences
Habitat open water and the air over open water
Extent 2 pages
Language(s) eng
Bibliographic Citation
Information Withheld
Individual Count 1
Occurrence Remarks The documentation form by Alan Grenon is the only one submitted and forms the basis of this record. Other observers include Babs Padelford, Loren Padelford, Ruth Green, Betty Grenon, and Bruce Wetteroth. | Elimination of similar species: This duck was similar in size or slightly larger than nearby Lesser Scaup; most of the bird was a brown slightly lighter than female Lesser Scaup, and without mottling patters. Among ducks that have considerable white on the face, few have white around the eye and extending back to the nape. This eliminates the scoters (also, the bill did not seem large or deep enough for most scoters), Harlequin Duck, Bufflehead, goldeneyes, Smew, scaup, and Northern Pintail (which might have a similar plumage, but with white lower on the neck and side of neck, patterning on the body, speculum, and more differences). Unmarked bill and wing eliminate aberrant Ring-necked Duck and scaup, respectively, and also other divers with contrasting wing markings (including Bufflehead, goldeneyes). The possibility of an aberrant Harlequin Duck exists, but that seems less likely than a young Long-tailed Duck at this location. | The original documentation form event lasted from 10:15:00/11:15:00 and 17:00:00/18:15:00.
Occurrence Status present
Field Number
Event Remarks Viewing Conditions: During the longer part of each observation period, the sun was behind me, the bird in front, as I observed the bird mostly from the east in the morning, and from the west in the afternoon. I used a 22 x 60 spotting scope for all observations of this bird, except for a few views through a zoom scope, set at about 25 x. Unfortunately, the bird was at considerable distance, probably in the vicinity of 200 to 300 feet.
Supporting Documentation National Geographic Society. National geographic field guide to the birds of North America. Washington D.C.: National Geographic Society. | Robbins CS, Bruun B, Zim HS. Birds of North America: a guide to field identification. New York: Golden Guides from St. Martin's Press. | Pearson, TG. Birds of America. New York: Garden City Publishing; 1936.
Date Digital 29 Nov 2017
File Type image/jpeg
Hardware / Software Epson - sheet feed
Rare bird documentation form for Long-tailed Duck at Lake Manawa, 1988