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48 results for “Formicivora”
FIGURE 27 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 27. Campo rupestre vegetation on rocky outcrops of the Serra do Sincorá, Chapada Diamantina, habitat of Formicivora grantsaui sp. nov. (Photos by Charles Ozanick).
FIGURES 24–25 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 24–25. Calls of Formicivora grantsaui sp.nov. (ASEC 10512): 24, a transition call between a series of alarm calls (see Fig. 9) and scolding calls; 25, a typical scolding call. Notice that the last note of the call in Fig. 24 is prolonged in a harsh sound, like a short version of the scolding call (window function Blackman, amplitude logarithmic, filter bandwidth 533 Hz, overlap 93.75%, FFT size 16384 points).
FIGURES 3–5 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 3–5. From left to right in each figure: holotype of Formicivora grantsaui sp. nov. (MNRJ 44149); male F. rufa collected at the same locality (MNRJ 44151); female paratype of F. grantsaui sp. nov. (MNRJ 44150); and female F. rufa collected at the same locality (MNRJ 44153); 3, ventral view; 4, lateral view; 5, dorsal view.
FIGURE 2 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 2. Formicivora grantsaui sp. nov. in its habitat near the type locality (Mucugê, Bahia). Above: adult male. Below: female-plumaged bird (Photos by Sidnei Sampaio).
FIGURE 8 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 8. Underside of the tail of the holotype of Formicivora grantsaui sp. nov. (MNRJ 44149), showing the pattern of white marks and two-toned (grey and black) coloration of the outer feathers.
FIGURE 1 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 1. Chapada Diamantina region in the Espinhaço Range, eastern Brazil, showing land above 1000 m and localities mentioned in the text (adapted from Davis et al. 1997).
FIGURES 9–12 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 9–12. The alarm call shared by: 9, Formicivora grantsaui sp. nov. (ASEC 10549); 10, F. r u f a (ASEC 3186); 11, F. acutirostris (MBBR s/no.); and 12, F. g r i s e a (ASEC 3011) presents a similar first note with a rapid descending frequency modulation followed by a second part, having up to three additional notes, whose structure is more variable among the several taxa. In F. grantsaui this final part most often has two very short notes (but see Figs. 13–14), while in the other species it always has only one note (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 16384 points).
FIGURES 19–20 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 19–20. Loudsong of: 19, Formicivora grantsaui sp. nov., showing six notes from a much longer series (ASEC 10549); 20, F. r u f a recorded at the same locality, showing a complete song phrase (ASEC 10539). Notice the pace about 7 times faster in F. r u f a. Inset in each figure is an enlargement on the time scale (same scale for all) to show more comparative detail (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 4096 points).
FIGURE 26 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 26. Two consecutive scolding calls of Formicivora grisea from coastal Bahia, Brazil (MLNS 35741) (see Figs. 24–25) (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 32768 points).
FIGURES 15–18 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 15–18. Territorial (duet) call of: 15, Formicivora grantsaui sp. nov. (ASEC 10545); 16, F. r u f a (ASEC 2818); 17–18, variants of F. g r i s e a (ASEC 2990 and 3012 respectively). Notice the shorter call with distinctive ascending/descending frequency modulation of notes in F. grantsaui (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 32768 points).
FIGURES 21–23 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 21–23. Distress call of: 21, Formicivora grantsaui sp. nov., two consecutive whistles (ASEC 10615, from the holotype); 22, F. g r i s e a, two consecutive whistles (JMCS 07/39); 23, F. r u f a, a complete trill (ASEC 3184). All recordings made from mist-netted birds. (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 16384 points).
FIGURE 28 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 28. Cerrado vegetation ("campos gerais") on lateritic soils west of the Serra do Sincorá, Chapada Diamantina, habitat of Formicivora rufa (Photo by Charles Ozanick).
FIGURE 7 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 7. Syntype of Myiothera rufa Wied (AMNH 5353), collected in the interior of Bahia, showing white underwing-coverts.
FIGURE 6 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURE 6. Comparison of underwing-coverts in specimens of Formicivora from Mucugê, Bahia. Left: grey and white in F. grantsaui sp. nov. (above: male MZUSP 76676; below: female MNRJ 44150). Right: entirely white in F. r u f a (above: male MNRJ 44154; below: female MNRJ 44153).
FIGURES 13–14 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)
FIGURES 13–14. Infrequent variants of the alarm call of Formicivora grantsaui sp. nov.: 13, with only one note on the second part of the call (ASEC 10512); 14, with three notes on the second part of the call (ASEC 10517). Notice that the first part of the call shows no significant variation in the note structure (see Fig. 9) (window function Blackman, amplitude logarithmic, filter bandwidth 533 Hz, overlap 93.75%, FFT size 16384 points).
FIGURE 35 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)
FIGURE 35. Principal Component Analysis (PCA) for male specimens. The blue, red and green ellipses represent, respectively, the groups of F. s. serrana, F. s. interposita and F. s. littoralis.
FIGURE 29. Call 1 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)
FIGURE 29. Call 1 phrase of F. s. serrana (LPG 102 12e). A. Oscillogram of a call 1 phrase. B. Detail of the structure of a call 1 syllable. C. Sonogram of a call 1 phrase. D. Detail of a call 1 syllable. Notice the rapid ascendant modulation in the beginning of the syllable followed by a long descendant modulation.
FIGURE 30. Call 1 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)
FIGURE 30. Call 1 phrase of F. s. interposita (LPG 021 08). A. Oscillogram of a call 1 phrase. B. Detail of the structure of a call 1 syllable. C. Sonogram of a call 1 phrase. D. Detail of a call 1 syllable. Notice the rapid abrupt descendant modulation in the beginning of the syllable followed by a smoother descendant modulation.
FIGURE 34 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)
FIGURE 34. Contact call syllables of F. s. littoralis (LPG 023 04) showing the variation in its structure. A. Sonogram of a syllable. B. Sonogram illustrating the variation in syllable structure.
FIGURE 28 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)
FIGURE 28. Sonograms showing the pauses in song phrases. A. Sonogram of a phrase of F. s. serrana (LPG 102 08). The pause is between 0.5 and 1 second. B. Sonogram of a phrase of F. s. interposita (LPG 021 08) illustrating the pause between 0 and 1 second. C. Sonogram of a phrase of F. s. littoralis (LPG c 015 24). Notice the pause between 0.5 and 1 second.
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