Main Article Content
factors which have been responsible for the evolution af spec if^ differences, such as the difference in frequency, in the order of displays linked in sequences and in the degree of
elaboration of plumage features reinforcing signal movements. As examples, Johnsgard (1960a) studied the courtship displays in North American black duck (Anas nrbripes) and mallard (Anas platyrhynchos), McKinney (1970) observed four species of bluewinged ducks (Anas cyanopteta, A. discors, A. clypeata and A. smithi) and Prawiradilaga (1985) investigated the grey teal (Anas gibberifrons) and chestnut teal (Anas castanea).
So far, not all of these specific factors have been brought up.
It is the aim of this review to examine and discuss aspects of evolution of courtship displays which have been presented; in particular the origin and evolutioh of social signals in ducks, especially those referred to specifically as courtship displays.
Authors submitting manuscripts should understand and agree that copyright of manuscripts published are held by Media Konservasi. Copyright encompass exclusive rights to reproduce, to distribute, and to sell any part of the journal articles in all form and media. The reproduction of any part of this journal, its storage in databases and its transmission by any form or media will be allowed only with a written permission from Media Konservasi.