Dan and NFC-ers,
Dan -- thanks for the note. I've found your papers on NFCs very
valuable, and I've made good use of your spectrogram table. I found it
particularly reassuring to see that you lumped species that I've always
had trouble distinguishing. I'd recommend the table from your earlier
paper to anyone struggling to get a handle on flight call categorization.
One question about your handling of calls in the dark/light site study:
How did you handle same-species calls withing a short time period? My
apologies if that's in the methods explanation. I did look for it, but
missed it if it's there.
Thanks for your work.
Cleveland Museum of Natural History
On 4/29/2016 6:28 AM, Daniel Joshua Mennill wrote:
> Hello Everyone,
> It is nice to find renewed interest in the NFC-L list.
> Thank you, Laura, for posting this information about the article my
> research team published in /Condor: Ornithological Applications/,
> concerning ground-level lights and NFCs. I thought I would provide a
> brief explanation of our research. My students and I conducted
> simultaneous NFC recordings at adjacent "dark sites" (no artificial
> lights) and "light sites" (sights with a low-level artificial light,
> such as a porch light or a street light). We found significantly
> higher numbers of NFCs above the light sites compared to the dark
> sites; on average, we found three times the number of NFCs about the
> light sites (on average, 31 NFCs per night above light sites compared
> to 11 NFCs per night above dark sites). We also found a greater
> diversity of species producing NFCs about light sites, but this
> difference was not significant (on average, 6.5 species or
> species-groups above light sites compared to 4.5 species or
> species-groups above dark sites). We conducted these recordings at 16
> pairs of sites in southern Ontario, north of Lake Erie.
> The take-away message from this paper: ground-level lights influence
> the behaviour of birds passing overhead in migration, even low-level
> lights like the lights in our backyards. We don't know if this is
> because birds are lowering their altitude in response to lights, or
> changing the course of their migration to pass over the lights, or
> being induced to call more often over lights compared to dark sites.
> I plan to try to study these alternatives, going forward.
> I'd be happy to share my "author's copy" of our /Condor/ paper to
> anyone who wants to read it; please email me off the list. I'd also
> like to point out that my website has a set of spectrograms of NFCs
> from 40 different species or species-groups, based on recordings we've
> made in Ontario over the last few years (it is a supplement from a
> previous paper that we published in /Condor/, showing that the number
> of NFCs is a good predictor of the timing and magnitude of migration
> of birds through the Great Lakes).
> Happy NFC listening to all on this list!
> Dan Mennill
> Associate Professor
> Chair, Biology Graduate Program
> Department of Biological Sciences
> University of Windsor
> Email: dmenn...@uwindsor.ca <mailto:dmenn...@uwindsor.ca>
> Web: www.uwindsor.ca/dmennill <http://www.uwindsor.ca/dmennill>
> On Thu, Apr 28, 2016 at 12:48 PM, Laura C. Gooch <lgo...@alum.mit.edu
> <mailto:lgo...@alum.mit.edu>> wrote:
> In the spirit of recent discussions from Geoff, John, and Chris, I
> thought list members might be interested in this from the May 2016
> issue of /The Condor/:
> Anthropogenic light is associated with increased vocal activity
> by nocturnally migrating birds
> *Matthew J. Watson ^1,
> David R. Wilson ^1,
> <http://aoucospubs.org/doi/abs/10.1650/CONDOR-15-136.1#n102>, and
> Daniel J. Mennill ^1
> These results certainly suggest that comparing call numbers from
> urban and rural sites is problematic. It's not clear to me what
> impact an isolated light might have.
> Laura Gooch
> P.S. If you need a hand with getting access to the full article,
> let me know off of the list.
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