Interesting stuff. Thanks for posting it.


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: 
> 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
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