Group Nesting of Mixed Passerine Birds

1953 ◽  
Vol 53 (3) ◽  
pp. 201-208 ◽  
Author(s):  
G. R. Gannon
Keyword(s):  
Passerine Birds ◽  
Group Nesting

Group Nesting of the Same Species of Passerine Birds

1953 ◽  
Vol 53 (4) ◽  
pp. 295-302 ◽  
Author(s):  
G. R. Gannon
Keyword(s):  
Passerine Birds ◽  
Group Nesting

Two new cestode species of the family Hymenolepididae Perrier, 1897 (Cyclophyllidea) from passerine birds in Ethiopia, with the erection of Citrilolepis n. g.

2019 ◽  
Vol 96 (3) ◽  
pp. 279-297
Author(s):  
Yana D. Dimitrova ◽  
Boyko B. Georgiev ◽  
Jean Mariaux ◽  
Gergana P. Vasileva
Keyword(s):  
Passerine Birds ◽  
Cestode Species ◽  
The Family

Alerting and Message Components in Songs of Rufous-Sided Towhees

Behaviour ◽  
1981 ◽  
Vol 76 (3-4) ◽  
pp. 223-249 ◽  
Author(s):  
Douglas G. Richards
Keyword(s):  
Signal Detection Theory ◽  
Field Experiments ◽  
Species Recognition ◽  
Defense Responses ◽  
Time Of Arrival ◽  
Sufficient Information ◽  
Passerine Birds ◽  
Frequency Range ◽  
Narrow Frequency Range ◽  
Species Specific

AbstractIn numerous species of passerine birds the initial few notes of the song have a narrow frequency range and wide temporal spacing when compared with the rest of the song. This structure is well adapted for high detectability when the song is acoustically degraded during passage through the environment. The song of the rufous-sided towhee (Pipilo eythrophtalmus) consists of relatively tonal introductory syllables followed by a complex rapid trill. The trill is capable of carrying more information than the introduction, but is inherently less detectable at a distance owing to degradation by reverberation, amplitude fluctuation, and frequency-dependent attenuation. Signal detection theory predicts that the detectability of the trill will be increased when it is preceded by the introductory syllables, owing to the removal of uncertainty concerning the time of arrival of the signal. This is alerted detection. I performed field experiments using playback of recorded song to towhees to test the hypothesis that these introductory syllables facilitate detection of conspecific song at a distance. Tape recordings of normal and artificially degraded full songs, introduction, and trills were played to territorial male towhees. Normal songs, degraded songs, and normal trills elicited strong territorial defense responses, indicating recognition as adequate species-specific song, and confirming that sufficient information is contained in the trill for species recognition. Degraded trills alone elicited little response. Both normal and degraded introductions also elicited little response, demonstrating that the increased response to a degraded full song over that to a degraded trill is not due to any species-specific characteristics of the introduction, but rather to its function as an alerting stimulus.

scholarly journals Evolution of iris colour in relation to cavity nesting and parental care in passerine birds

2017 ◽  
Vol 13 (1) ◽  
pp. 20160783 ◽  
Author(s):  
Gabrielle L. Davidson ◽  
Alex Thornton ◽  
Nicola S. Clayton
Keyword(s):  
Parental Care ◽  
Eye Gaze ◽  
Dependent Manner ◽  
Passerine Birds ◽  
Cavity Nesters ◽  
Cavity Nesting ◽  
Ideal System ◽  
Nesting Behaviour ◽  
Gaze Sensitivity ◽  
Iris Colour

Strong selection pressures are known to act on animal coloration. Although many animals vary in eye colour, virtually no research has investigated the functional significance of these colour traits. Passeriformes have a range of iris colours, making them an ideal system to investigate how and why iris colour has evolved. Using phylogenetic comparative methods, we tested the hypothesis that conspicuous iris colour in passerine birds evolved in response to (a) coordination of offspring care and (b) cavity nesting, two traits thought to be involved in intra-specific gaze sensitivity. We found that iris colour and cooperative offspring care by two or more individuals evolved independently, suggesting that bright eyes are not important for coordinating parental care through eye gaze. Furthermore, we found that evolution between iris colour and nesting behaviour did occur in a dependent manner, but contrary to predictions, transitions to coloured eyes were not more frequent in cavity nesters than non-cavity nesters. Instead, our results indicate that selection away from having bright eyes was much stronger in non-cavity nesters than cavity nesters, perhaps because conspicuous eye coloration in species not concealed within a cavity would be more visible to predators.

scholarly journals Duplication of Accelerated Evolution and Growth Hormone Gene in Passerine Birds

2008 ◽  
Vol 25 (4) ◽  
pp. 795-795
Author(s):  
T. Yuri ◽  
R. T. Kimball ◽  
E. L. Braun ◽  
M. J. Braun
Keyword(s):  
Growth Hormone ◽  
Growth Hormone Gene ◽  
Passerine Birds ◽  
Accelerated Evolution
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