new and/or recent research on aerial insectivore ecology

There is much concern about the status of many aerial insectivore bird species.  

Here are several recent papers/reports on aerial insectivore (and related) research:

Stable Isotopes from Museum Specimens May Provide Evidence of Long-Term Change in the Trophic Ecology of a Migratory Aerial Insectivore

 https://www.frontiersin.org/articles/10.3389/fevo.2018.00014/full

 A Warmer Midwest Could Lead to a Common Bird Being Less Common Over the Next Century

 https://www.nrs.fs.fed.us/news/release/flycatchers-climate

 The grand challenges of migration ecology that radar aeroecology can help answer

 https://onlinelibrary.wiley.com/doi/full/10.1111/ecog.04083

 Climate Change and Insectivore Ecology

 https://onlinelibrary.wiley.com/doi/abs/10.1002/9780470015902.a0028030