Olivaceous Elaenia

elaenia mesoleuca

Tyrannidae,Elaeninae · Tyrannulets

Disc 2 · 2001 listed
Disc 3 · 2006 listed
Disc 1 · 2011 listed

The account

Description

15 cm. Closely resembles Elaenia parvirostris but is more dark olive with indistinctive streaking below and has only two wing bars.

A dark bird, olive-brown above, the wings black with two yellow wing bars. Olive-gray below with darker indistinct longitudinal streaks. Throat lighter. Center of belly whitish. Flanks olive-yellow. Crissum olive yellow.

The disc records this picture against the bird without a caption. Disc 3 · 2006

Where it was recorded

The discs' own checklists select Olivaceous Elaenia at 15 localities.

Historical checklist localities on the disc's own area map — the red dots the original program drew, placed by its recovered projection. Not a range map: it shows the places whose checklists record the bird, nothing more.

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.

Voice

Has a number of characteristic calls, including a 'piurr' or 'wiurr' (repeated). Song (?) is a rythmic harsh 'wrik-wrikiurrr', 'wek-wiurrr', or 'wek-wek-wek-wek-wikiurr'.

Behavior

A typical upward-hover gleaner. Also eats fruits. Frequently seen perched exposed on a branch or top of tree.

Habitat and status

The common Elaenia of the higher altitudes. Not uncommon at forest borders, and therefore not so frequently seen in the interior canopy of montane forest. Seems to be most frequent at the tree line, where single large trees penetrate into the bush zone, or at the border of secondary clearings.

Distribution

Seems to be most regularly encountered at an altitude between about 700 meters to 2200 meters throughout the area (Serra dos Orgãos, Serra Mantiqueira, Serra Bocaina, Campos do Jordão, Nucleo Sta. Virginia, Boraceia, upper parts of Fazenda Intervales etc.). Pinto lists the species also from Ipiranga (a suburb southeast of São Paulo, 1897, 1941) and from Itararé, N of Curitiba in Estado São Paulo (1903).

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

Call. Serra Bocaina, near S. Jose do Barreiro, 11/4/93. Sunny, 25°C. Open forest
Call. Serra Bocaina, near S. Jose do Barreiro, 11/4/93. Sunny, 25°C. Open forest. With Hylophilus poicilotis.
Call. Serra Bocaina, near S. Jose do Barreiro, 11/2/93. Cloudy, 20°C. Open forest. With Grallaria varia.
Song. Serra Bocaina, near S. Jose do Barreiro,11/3/93. Cloudy, 20°C. Open forest. With Basileuterus leucoblepharus, Phyllomyias virescens.
Calls. Ubatuba, Nucleo Sta. Virginia, 10/25/94. Sunny, 25°C. Secondary forest
Calls. Fazenda Intervales, 11/29/97. Sunny, 27°C. Primary forest. With Carpornis cucullatus, Hylophilus poicilotis.

Recording files on the disc

6820.mp3 Call. Serra Bocaina, near S. Jose do Barreiro, 11/4/93. Sunny, 25°C. Open forest
7787.mp3 Call. Serra Bocaina, near S. Jose do Barreiro, 11/4/93. Sunny, 25°C. Open forest. With Hylophilus poicilotis.
16122.mp3 Call. Serra Bocaina, near S. Jose do Barreiro, 11/2/93. Cloudy, 20°C. Open forest. With Grallaria varia.
2831.wav Song. Serra Bocaina, near S. Jose do Barreiro,11/3/93. Cloudy, 20°C. Open forest. With Basileuterus leucoblepharus, Phyllomyias virescens.
6183.mp3 Calls. Ubatuba, Nucleo Sta. Virginia, 10/25/94. Sunny, 25°C. Secondary forest
10378.mp3 Calls. Fazenda Intervales, 11/29/97. Sunny, 27°C. Primary forest. With Carpornis cucullatus, Hylophilus poicilotis.

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.

The account in the Disc 1 · 2011 revision

The 2011 Disc 1 revision carries this account text unchanged from the Disc 3 release.

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	elaenia mesoleuca	Olivaceous Elaenia	Tyrannidae,Elaeninae
CLEMENTS	elaenia mesoleuca	Olivaceous Elaenia	Tyrannidae,Elaeninae
AOU_HM	elaenia mesoleuca	Olivaceous Elaenia	Tyrannidae,Elaeninae

Source details

Identifier on this site: seb_species_0196
Account identifier: seb_account_0196
Account number on the disc: 196
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative