Creamy-bellied Gnatcatcher
polioptila lactea
Polioptilidae · Gnatcatchers
- Disc 2 · 2001 listed
- Disc 3 · 2006 listed
- Disc 1 · 2011 listed
The account
Description
11.5 cm. In Southeast Brazil a bird of the past. Upper parts bluish gray. Wings black with white wing bars. Primaries and secondaries edged white. Crown black. White cheeks. Tail black with white outer feathers. Underside creamy white.
The female lacks the black crown.
-
Male Disc 3 · 2006 -
Female Disc 3 · 2006
Each plate is labelled with the disc's own caption.
Where it was recorded
The discs' own checklists select Creamy-bellied Gnatcatcher at 2 localities.
- PE Jacupiranga PJSB
- Reserva Ecológica Guapiacú RERB
How the map was made
The original program computed each red dot at display time from the locality's coordinates, using its map library and one of five base maps drawn for the screen widths of the day. That library's projection — an oblique rotation of the sphere about the map's own centre, 23.7°S 47.4°W — was read from the program and checked against the graticule the same program drew into the base maps: it reproduces every grid intersection to within about a pixel. The dots here use that projection on the 1280-pixel base map, with the coordinates the discs record. Nothing was placed by hand, no modern map data was used, and a place whose coordinate is incomplete, out of range or beyond the map's edge is listed rather than guessed.
The discs carried location maps only; none shows a distribution or range.
The account, continued
Voice
Call similar to other gnatcatchers, a slurred 'weet' or a 'zi-wet', faintly 'gyp'. Song a 'tee tee tee tee swee swee swee' (146).
Behavior
Forages in canopy and at medium height of forest. Commonly in mixed species flocks.
Breeding
A cup nest 25-39 meters up in a bare tree north of the Iguazu airport (146).
Habitat and status
This species was an inhabitant of the interior dryer forests which became heavily fragmented or have disappeared.
Distribution
Originally distributed from Espiritu Santo to northern Rio Grande do Sul, but the sources of this information are not known. Now regularly only encountered in the southern and south-western part of its range (146). Still found in small numbers inland in the drier primary forests of Parque National de Iguazu, in northwest Rio Grande do Sul, in western Santa Catarina, in eastern Paraguay, in Misiones and Corrientes, Argentina. There are only a few old Brazilian recordings listed by Pinto (40), a sign of its rareness: Rio Feio, NW Estado São Paulo, Rio Ribeira near Iguape, Estado São Paulo, both from 1905. It seems that this species never adapted to the altered conditions that resulted from clear cutting and subsequent regrowth of secondary forest. Does not occur above 400 meters (133).
Decoded from the disc's own bytes. Each part is shown under the heading the disc files it under, and the wording, spelling and punctuation are the author's.
Vocalizations
-
Juan Mazar Barnett
Recording files on the disc
- 2595.mp3 Juan Mazar Barnett
Across the three discs
The work was published on three discs — Disc 2 in 2001, Disc 3 in 2006 and Disc 1 in 2011. Where they differ, that is a difference between historical releases, and it is never merged away. The 2011 disc is not treated as correcting the earlier ones.
Which discs list this bird
- Disc 2 · 2001 — in this disc's bird list
- Disc 3 · 2006 — in this disc's bird list
- Disc 1 · 2011 — in this disc's bird list
How that was established
- Disc 2 · 2001
aux_nonzero;local_checklist_byte45_flag_1- Disc 3 · 2006
aux_nonzero;local_checklist_byte45_flag_1- Disc 1 · 2011
aux_nonzero;local_checklist_byte45_flag_1
The disc's own record fields that place the bird on its list: a non-empty entry in the species table, and the byte that marks it as selected on a local checklist.
Names by release
- Cream-bellied Gnatcatcher polioptila lactea Disc 2 · 2001
- Creamy-bellied Gnatcatcher polioptila lactea Disc 3 · 2006, Disc 1 · 2011
The account in the Disc 1 · 2011 revision
In the 2011 Disc 1 revision, part of this account was truncated at exactly 512 bytes (a 2011 mastering defect). The earlier releases preserve the complete text.
Truncated sections in the 2011 revision: distribution. The complete earlier text is shown beneath each truncated section.
Description Disc 1 · 2011
11.5 cm. In Southeast Brazil a bird of the past. Upper parts bluish gray. Wings black with white wing bars. Primaries and secondaries edged white. Crown black. White cheeks. Tail black with white outer feathers. Underside creamy white.
The female lacks the black crown.
Voice Disc 1 · 2011
Call similar to other gnatcatchers, a slurred 'weet' or a 'zi-wet', faintly 'gyp'. Song a 'tee tee tee tee swee swee swee' (146).
Behavior Disc 1 · 2011
Forages in canopy and at medium height of forest. Commonly in mixed species flocks.
Breeding Disc 1 · 2011
A cup nest 25-39 meters up in a bare tree north of the Iguazu airport (146).
Habitat and status Disc 1 · 2011
This species was an inhabitant of the interior dryer forests which became heavily fragmented or have disappeared.
Distribution Disc 1 · 2011
Originally distributed from Espiritu Santo to northern Rio Grande do Sul, but the sources of this information are not known. Now regularly only encountered in the southern and south-western part of its range (146). Still found in small numbers inland in the drier primary forests of Parque National de Iguazu, in northwest Rio Grande do Sul, in western Santa Catarina, in eastern Paraguay, in Misiones and Corrientes, Argentina. There are only a few old Brazilian recordings listed by Pinto (40), a sign of its
Disc 1 (2011) text ends here — truncated at exactly 512 bytes in the 2011 mastering (historical defect, kept as recovered).
Complete earlier text — Disc 3 · 2006 (285 bytes lost in 2011)
Originally distributed from Espiritu Santo to northern Rio Grande do Sul, but the sources of this information are not known. Now regularly only encountered in the southern and south-western part of its range (146). Still found in small numbers inland in the drier primary forests of Parque National de Iguazu, in northwest Rio Grande do Sul, in western Santa Catarina, in eastern Paraguay, in Misiones and Corrientes, Argentina. There are only a few old Brazilian recordings listed by Pinto (40), a sign of its rareness: Rio Feio, NW Estado São Paulo, Rio Ribeira near Iguape, Estado São Paulo, both from 1905. It seems that this species never adapted to the altered conditions that resulted from clear cutting and subsequent regrowth of secondary forest. Does not occur above 400 meters (133).
Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.
The work's own taxonomy
The discs carried three parallel name schemes. All three are shown as recovered; none is a modern taxonomy and none has been updated.
| Scheme | Scientific name | English name | Family |
|---|---|---|---|
| WORLD | polioptila lactea | Creamy-bellied Gnatcatcher | Polioptilidae |
| CLEMENTS | polioptila lactea | Cream-bellied Gnatcatcher | Polioptilidae |
| AOU_HM | polioptila lactea | Cream-bellied Gnatcatcher | Polioptilidae |
Source details
- Identifier on this site
- seb_species_0334
- Account identifier
- seb_account_0334
- Account number on the disc
- 334
- Source edition
- CD03 / 2006 package
- Original taxonomy scheme
- WORLD
- Structure status
- heuristic; decoded_account_text and segment JSON remain authoritative