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Index of Subjects And sometimes things get a bit off track: http://rickwhitman.smugmug.com/Nature/Birds-April-June-2015/i-HvfRNKL/A (The diagnostic photo follows this mp4 file. The sirens are irrelevant.) Rick Whitman On 6/16/15, nancy dowd <nancypdowd@gmail.com> wrote: > Hi Steve > > I'm not an expert on anything but there was, and likely still is, a lot of > really interesting work being done on bird song development and recognition. > It is generally thought that birds are born with a genetic template of their > song that is shared by all members of that species. This template is usually > (but not always) modified through learning leading to individual and > geographic song variations. But the shared template coded into each > individual of that species remains and likely is the reason the birds can > filter out other species' songs despite intra- and interspecific variations. > They can pick out the basic genetically coded "song" amidst all of the > noise. It seems technology would need to be able to tease out the > genetically encoded song template of each species to reliably separate them. > If or how this could ever be done is beyond me. > > I am mainly dragging this up from memory of papers read during some > song-type recording work about 20yrs ago. This site covers the same subject > https://web.stanford.edu/group/stanfordbirds/text/essays/Vocal_Development.html > and further searching should turn up some other more (recent) works on this > topic. > > Nancy > > > On 2015-06-16, at 1:10 PM, Stephen Shaw <srshaw@Dal.Ca> wrote: > >> If experienced birders armed with sound analysis software (that birds >> don't have) sometimes can't easily distinguish between calls made by >> related species, are the birds themselves in the same fix? Do species >> with similar songs occasionally get attracted acoustically to the wrong >> species partner or rival, when there's no immediate visual contact to >> help? Are their sound filters just better than ours, or are they helped >> mostly by occupying different geographic niches? Or is the learned >> component in bird songs important for this? >> If two sympatric daughter species evolved from their common ancestor, >> there must have been strong selection pressure for the songs to diverge >> significantly to become operationally distinct in order to maintain >> breeding isolation. >> Is anything known about what constitutes a 'just noticeable difference' in >> a song for this? -- someone must have looked at this. >> Steve >> ________________________________________ >> From: naturens-owner@chebucto.ns.ca [naturens-owner@chebucto.ns.ca] on >> behalf of Jeff MacLeod [jeffnaturens@gmail.com] >> Sent: Tuesday, June 16, 2015 7:51 AM >> To: naturens >> Subject: Re: [NatureNS] Looking for help with a song ID >> >> Thanks for the replies. I feel pretty silly for not realizing that is a >> yellow-rump! I knew it was familiar, but get stuck looking for a distinct >> two-part trill from a yellow-rump. Oh well. Rick, glad you also think the >> first is a Redstart. >> >> Jeff >> >> >> On Tue, Jun 16, 2015 at 7:38 AM, nancy dowd >> <nancypdowd@gmail.com<mailto:nancypdowd@gmail.com>> wrote: >> Oops. I did not see Rick's comment before I posted. At least we agreed. >> >> Nancy >> On 2015-06-16, at 7:31 AM, nancy dowd >> <nancypdowd@gmail.com<mailto:nancypdowd@gmail.com>> wrote: >> >>> Not sure but your second recording XC252875 sounds like a Yellow-rumped >>> Warbler- a bouncy slightly rising and falling trill. >>> >>> Nancy >>> On 2015-06-15, at 10:25 PM, Jeff MacLeod >>> <jeffnaturens@gmail.com<mailto:jeffnaturens@gmail.com>> wrote: >>> >>>> Another that I'm having some difficulty with: >>>> http://www.xeno-canto.org/252875 >>>> >>>> >>>> >>>> On Mon, Jun 15, 2015 at 9:04 PM, Jeff MacLeod >>>> <jeffnaturens@gmail.com<mailto:jeffnaturens@gmail.com>> wrote: >>>> http://www.xeno-canto.org/252866 >>>> >>>> From Meaghers Grant this morning. I heard some Redstarts around there >>>> that sounded like this and left out the end note. >>>> >>>> Thoughts about the ID? >>>> >>>> -- >>>> Jeff MacLeod >>>> Halifax >>>> >>>> >>>> >>>> -- >>>> Jeff MacLeod >>>> Halifax >>> >> >> >> >> >> -- >> Jeff MacLeod >> Halifax > >
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