UID
Digital Object Type Rare birds documentation form
Content DM Link https://n2t.net/ark:/87292/w97659j1t
Type Text
Description Records Committee review for a Parasitic Jaeger at Saylorville Reservoir in Polk County, IA on October 14, 1985. Includes a record review document with votes, an article of Iowa Bird Life, and six documentation forms submitted to the committee.
Related Genres Administrative records Clippings (information artifacts) Field notes
Sort Date 1985-10-14 - 1993-09-03
People / Organizations
Time 9:15 AM
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Collection Iowa Ornithologists' Union | MS 166
Box 10
Folder 16
Contributing Institution Iowa State University Library Special Collections and University Archives
Creator / Author Myers, Robert K.
Contributors Dinsmore, Stephen J. Kent, Thomas H. (Thomas Hugh), 1934- Bendorf, Carl J. Engebretsen, Bery Moore, Francis L. Iowa Ornithologists' Union Records Committee
Topics Bird watching Ornithology Ornithology--Societies, etc
Birds Parasitic Jaeger
Locations Saylorville Lake
Map
Verbatim Locality Saylorville Reservoir, Polk Co., Iowa
Location Remarks The documentation forms do not include georeferences
Habitat General: Saylorville Reservoir- large impoundment on DesMoines [sic] River. Specific: Always out in main deeper part of lake.
Extent 11 pages
Language(s) eng
Bibliographic Citation
Information Withheld
Individual Count 1
Occurrence Remarks The documentation form by Robert K. Myers is the one that forms the basis of this record. Other documentation forms by Stephen Dinsmore, Francis L. Moore, Carl J. Bendorf, Thomas H. Kent, and Bery Engebretsen were submitted. Other observers include Dennis Thompson, Eloise Armstrong, Eugene Armstrong, Tom Staudt, and many unidentified observers. | Elimination of similar species: Pomarine Jaeger and Long-tailed Jaeger are possible. See explanation on back as to why I believe this was Parasitic Jaeger. [...] A juvenile dark phase Pomarine would also show much white in the base of primaries (top and bottom) and the tail wouldn't have any long streamers. The Pomarine should however be a larger bird (Herring Gull size). The Pomarine's flight should be slower and more labored than this bird was. A juvenile dark phase Long-tailed Jaeger would not show as much white on dorsal side of primaries as this bird did and the flight pattern should be almost tern-like which it was not. Long-tailed Jaegers should also appear to be more grayish than the bird in question- even in dark phase. Further note on size-- As the jaeger rested on the water, double-crested cormorants would sometimes swim into the field of view and they appeared to be at least one-third larger than the jaeger. A pied-billed grebe also swam near once and the jaeger was probably 1/4 again longer than the grebe. | The original documentation form event lasted from 09:15:00/09:40:00 and seen several times after that for a total of sixty minutes.
Occurrence Status present
Field Number 1985-19
Event Remarks Viewing Conditions: Distance: Closest = 100 -150 yds. (eyeball) Other sightings were up to one-third mile. Optical Equipment: 25 and 40X scope Light: Day was overcast and we saw bird from several angles - fairly good light.
Supporting Documentation
Date Digital 24 May 2017
File Type image/jpeg
Hardware / Software Epson - sheet feed