In the song many a bird imagines "grobstadtslang" out?
The question of whether songbird on acoustic pollution (cf. The terror of the larm) how jackhammers, trucks and cell phones react is increasingly occupying science.
There is a danish study, about two years old, which claims to have found that traffic alarms on busy roads with up to 6,0000 cars per day cause changes in the behavior of birds within a radius of about three kilometers. But even quieter streets with 1,000 cars a day still affect the birds within a kilometer and a half. The continuous larmbaiting leads them to spit less coarse sounds: their chirping is becoming simpler and contains fewer sound nuances. But because the song also serves to delimit the territory and to communicate with possible sexual partners, a lower reproduction can be the consequence of the larm.
This new selection prere is also the keyword for the study published in the current ie of nature paper. Dutch biologists found that great tits sing at a higher pitch than their counterparts in quieter neighborhoods when there is coarse background noise, such as in the car-rich parts of the city. Even when a truck thunders by, the great tit sings; to cope with the rather low-frequency city noise, it flies into even higher tone regions than usual. The titmice that are spared from the alarm tend to help themselves from the lower tones of their spectrum.
Humanized, one could say that in the center of the city, in the coarse city another "slang" prevails than in the "good" suburbs. What is amazing is that it seems that the great tit was adapting its songs to the territory, instead of choosing the territory in which to sing its songs. It is possible that the birdsong in berlin is more similar to that in paris or london than to that in berlin’s countryside.
Our results show, as far as we know for the first time, (not quite, as we saw at the beginning, m.S.) that environmental conditions altered by humans change the communication signals of a wild bird species. All kinds of machines create a new selection prere on wild species that use acoustic signals to succeed in reproduction. This may create two groups in the future: those species that can adapt their signals to the competing alarm and those that are not capable of doing so.
In other words, the great tit is suitable for the city bird, inveterate "land bird" could have gone down in the alarm, because they were no longer audible. To prove the study, however, it was first necessary to know whether it is true that the female great tit can really hear the higher tones better.
Technology imitates nature, nature imitates technology. While virtual bird sound genuine (cf. Virtual bird can sing real), real bird ring like cell phones. Now it is necessary to know that until today it is not completely unraveled how birds actually learn to sing. What is certain, however, is that imitation and insistence play a central role. A few months ago, scientists in chicago were able to prove that songbirds learn their repertoire in their sleep, so to speak, namely by practicing over and over again in their dreams what they say during the day.
In the field of imitation, starlings in particular are among the most talented birds (cf. Don’t sing too high, my little friend, starlings chirp ursonate – and thus challenge copyright). So it is almost one of the urban legends, that a dane calls a starling in his garden the name of "nokia" because the bird was able to imitate the ringing of its cell phone in such an exchangeably genuine way. Then, in the future, we will perhaps know a noki ant, a motorola siskin and an ericsson’s blackbird, in addition to such exotic birds as the shama thrush or the dajal thrush (both from southeast asia).