Este site dedica-se às aves e a relação com o Homem.
O canto do Timbrado, do Harz,do Malinois.
O objectivo de site é contar as aventuras e os arcos de descobertas.
This site is dedicated to birds.singing canaries song,canaries,canaries de chant.
27 de julho de 2016
Inbred Songbirds Cannot Carry A Tune
Female songbirds choose mates based on their songs, and this study provides some insights into what aspects of song they use to identify a “quality” male
A domestic canary (Serinus canaria forma domestica). (Credit:Youtube.)
When a female chooses a mate, she is looking for a male who possesses a set of characters that makes him attractive. In songbirds, one of the primary characters that females use to choose a mate is the quality of his song. But many songbirds learn their songs from older males, which points to the familiar and longstanding “nature versus nurture” debate: does quality result from growing up in a good environment or it is based solely upon having good genes? And hand-in-hand with that argument comes another question: what aspect of a male’s song is important to a female songbird?
Just what do females want?
Like a male peacock’s huge, colorful tail (or like an expensive red sportscar), ornaments that reflect a male’s quality are necessarily costly to the male in ways that test his survival (or credit rating), thereby creating an honest signal that reflects his overall quality as a mate (ref). Males who overcome this “handicap” long enough to breed are reliably of higher quality than are males who lack these expensive ornaments — or who do not survive long enough to breed.
But when it comes to mate choice, what, exactly, is “quality”?