Playing bird songs recordings in the field disrupts their mating pattern (1 Viewer)

Playing bird songs recordings in the field disrupts mating pattern of birds

It can be useful in detecting their presence by provoking their answer or luring them to the camera, but can be harmful.
http://telegraph.feedsportal.com/c/...utting0Ebirds0Eoff0Enesting0Bhtml/story01.htm
Birdsong app 'putting birds off nesting'

http://news.nationalgeographic.com/...ional+Geographic+News+-+Animals+%26+Nature%29

The Ethical Flap Over Birdsong Apps
The trouble is, there's a slippery slope leading toward harassment of rare and/or endangered birds. (...)
The organization's [ABA] Code of Ethics suggests that birders limit the use of recordings and other methods of attracting birds
(...)
Banned in National Parks

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So, they are good to learn bird recognizing by voice, but not good for birds if used to provoke or attract them.
Actually in forests most of birds are hidden behind foliage and knowing their songs is crucial. And they sing mostly in spring, later forest is silent and overgrown by plants.
Some of species are also very similar, like many of those living in rushes. And they differ almost only in calls.
The Corn Crake is almost always hidden in grass ...
I have heard, that ornithologists play recorded calls to detect owls, perhaps Eurasian Pygmy Owl or Boreal Owl, but it makes such birds insensible to real calls. Or something like that. Is it true ?
They also detect this way some of crakes (Porzana). Perhaps such artificial voices mislead also these birds.
Taking picture of Bearded Reedling is probably much easier using this method.
Severity of such impact depends obviously on number of birders playing recordings in given area.