John, Interesting stuff. Thanks for posting it.
Laura On 5/18/2016 8:41 AM, John Kearney wrote: > > Hi All, > > I monitored night flight calls on a coastal headland for two autumn > seasons, 2013 and 2015, using the same methods and equipment in each > year. You can see a summary table of the results here: > http://www.johnfkearney.com/Glasgow_Head_Guyborough_County.html. > > There was a remarkable increase in the number of warbler night flight > calls in 2015 compared to 2013. While many warblers increased 2 to > 7-fold, Cape May Warblers were 9 times higher and Bay-breasted > Warblers 11 times higher. The latter two species are known to be > Spruce Budworm dependent species and have been shown to increase > substantially more than other warbler species during an outbreak. > There is reported to be an increasing infestation in areas well north > of my monitoring station. A possible cause for concern is that another > budworm dependent species, the Tennessee Warbler had fewer flight > calls in 2015. > > Part of the reason for this post is to suggest that there can be a > utility to identifying difficult flight calls, like the zeep and > double-up calls, to the species level. Of course, these > identifications are not going to be correct all of the time. There is > only a certain probability that they are correct. I do use > measurements and certain rules in guiding my identification of > difficult species. I only id to the species level when I judge there > to be a relatively high probability that it is correct, although I > can’t as yet give an exact probability range. For those ids that I > judge to have less than a high probability, I leave to the generic or > family level (these are also listed in the table of results in this > study). > > Any comments would be most welcome. > > John > > -- > *NFC-L List Info:* > Welcome and Basics <http://www.northeastbirding.com/NFC_WELCOME> > Rules and Information <http://www.northeastbirding.com/NFC_RULES> > Subscribe, Configuration and Leave > <http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm> > *Archives:* > The Mail Archive > <http://email@example.com/maillist.html> > Surfbirds <http://www.surfbirds.com/birdingmail/Group/NFC-L> > BirdingOnThe.Net <http://birdingonthe.net/mailinglists/NFCL.html> > *Please submit your observations to eBird > <http://ebird.org/content/ebird/>!* > -- -- NFC-L List Info: http://www.NortheastBirding.com/NFC_WELCOME http://www.NortheastBirding.com/NFC_RULES http://www.NortheastBirding.com/NFC-L_SubscribeConfigurationLeave.htm ARCHIVES: 1) http://firstname.lastname@example.org/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NFC-L 3) http://birdingonthe.net/mailinglists/NFCL.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --