Does Chaffinch Fringilla coelebs song vary with the habitat in which it is sung?

The acoustic adaptation hypothesis suggests that song learning in birds is advantageous because it enables song to become adapted to the habitat in which it is sung. A comparison was made among song types recorded from male Chaffinches Fringilla coelebs at a variety of sites in open scrub and in coniferous plantations, as well as in mature pine forest. Although some significant differences were found among habitats, these were few and there was no systematic relationship with features of the environment. This study does not therefore support the acoustic adaptation hypothesis.