Hi all, In the recent tagging study, the first juvenile Ipswich was detected on the mainland on 17 September (Crysler et al. 2016, Movement Ecology DOI 10.1186/s40462-016-0067-8), and you’d expect a lower frequency call from this bigger subspecies (its song is slightly lower, too), so this all makes sense.
Cheers, Andy Horn Halifax On Sep 26, 2016, at 8:44 AM, John Kearney <john.kear...@ns.sympatico.ca<mailto:john.kear...@ns.sympatico.ca>> wrote: Hi All, As an update to my response to Preston’s post yesterday, Jerald sent me offline a copy of a blog entry by Paul Driver on Ipswich Sparrow flight calls (http://pjdeye.blogspot.ca/2009/12/ipswich-sparrow-flight-calls.html). Recordings of the flight calls of Ipswich Sparrows in NJ show that their frequency can be much lower than previously thought and that the feature most distinguishing them from the nominate race of Savannah Sparrow is the degree of modulation in the call. This sheds a new light on Preston’s call in Westport. It is interesting to note that I posted what I thought might be an Ipswich Sparrow flight call to this forum on 18 September 2013. Attached is a photo of the spectrogram, and the wav file can be found in the archives for that date. The call was recorded at Canso, NS. The point on the mainland of North America closest to Sable Island. Based on Paul Driver’s blog post, this call would also be a good candidate for Ipswich Sparrow. John From: bounce-120823749-28417...@list.cornell.edu<mailto:bounce-120823749-28417...@list.cornell.edu> [mailto:bounce-120823749-28417...@list.cornell.edu] On Behalf Of John Kearney Sent: September-25-16 12:21 To: 'Preston Lust' <prestonl...@yahoo.com<mailto:prestonl...@yahoo.com>>; 'NFC-L' <nf...@list.cornell.edu<mailto:nf...@list.cornell.edu>> Subject: RE: [nfc-l] Interesting Savannah Sparrow Call Hi Preston, You indeed have an interesting call. My feeling is that it is a highly modulated Savannah Sparrow rather than “Ipswich” Savannah Sparrow. I believe an Ipswich Sparrow should be of a higher frequency overall. That being said, I think we need some more examples of Ipswich flight calls and come up with a range of measurements for analyzing spectrograms. It is also unlikely, not impossible, but unlikely that you would have an Ipswich Sparrow in Connecticut this early. Juvenile Ipswich Sparrows start leaving Sable Island in late September and will usually spend time on the coast of Nova Scotia and Maine before heading further south. Adults don’t leave until October. You might find this You Tube video interesting about recent radio telemetry studies on the timing of migration and movements of Ipswich Sparrows: https://www.youtube.com/watch?v=vxtQggEA6XA. John Carleton, NS From: bounce-120823611-28417...@list.cornell.edu<mailto:bounce-120823611-28417...@list.cornell.edu> [mailto:bounce-120823611-28417...@list.cornell.edu] On Behalf Of Preston Lust Sent: September-25-16 10:05 To: NFC-L <nf...@list.cornell.edu<mailto:nf...@list.cornell.edu>> Subject: [nfc-l] Interesting Savannah Sparrow Call 9/24-25/16, 8:00 PM-6:30 AM -- Yard, Westport CT While looking through the results of last night's extremely productive recording, I stumbled upon a very interesting savannah sparrow call which is superficially similar to an Ipswich call, mainly because it is highly modulated. As Ipswich savannah sparrows are very rare in Connecticut, I was wondering if anyone could confirm or refute this tentative ID. Attached is a screenshot of the spectrogram, and (a very brief) clip of the call. 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