Geographic, ecological and subspecific variations in the song of the Rufous-Browed Peppershrike (Cyclarhis Gujanensis)

Article Abstract:

The Rufous-Browed Peppershrike (Cyclarhis Gujanensis) has a repertoire of almost seven songs. The song structure varies according to habitat as revealed by a multivariate analysis of variance after removing the effect of latitude and altitude. There are considerable linkages between principal component values and latitudes, which suggests that songs from equatorial areas are shorter in duration, have optimum frequency and number of syllables and are less repetitive when compared with those from the temperate areas.

Influence, Physical geography

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Intraspecific variation and evolutionaly reduction of tendon ossification in Dendrocincla Woodcreepers

Article Abstract:

A comparative study of the levels of intraspecific variation and evolutionary reduction of tendon ossification in Dendrocincla Woodcreepers revealed to have reduced tendon ossification. However, variation in tendon ossification was greater in certain parts of the hindlimb muscles. This condition provides an example of extensive intraspecific variation in the hindlimb myology of passerines.

Analysis, Passeriformes, Perching birds, Phylogeny, Ossification

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Does beak size affect acoustic frequencies in Woodcreepers?

Article Abstract:

Research is presented concerning the differences in song which occur with differences in beak morphology in the Woodcreeper. The negative relationships existing between beak size and song frequencies are discussed.

Sound production by animals, Animal vocalization, Resonance, Resonance (Physics), Beak

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