The bat-bird-bug battle: daily flight activity of insects and their predators over a rice field revealed by high-resolution Scheimpflug Lidar

Royal Society Open Science
Elin MalmqvistSusanne Åkesson

Abstract

We present the results of, to our knowledge, the first Lidar study applied to continuous and simultaneous monitoring of aerial insects, bats and birds. It illustrates how common patterns of flight activity, e.g. insect swarming around twilight, depend on predation risk and other constraints acting on the faunal components. Flight activity was monitored over a rice field in China during one week in July 2016, using a high-resolution Scheimpflug Lidar system. The monitored Lidar transect was about 520 m long and covered approximately 2.5 m3. The observed biomass spectrum was bimodal, and targets were separated into insects and vertebrates in a categorization supported by visual observations. Peak flight activity occurred at dusk and dawn, with a 37 min time difference between the bat and insect peaks. Hence, bats started to feed in declining insect activity after dusk and stopped before the rise in activity before dawn. A similar time difference between insects and birds may have occurred, but it was not obvious, perhaps because birds were relatively scarce. Our observations are consistent with the hypothesis that flight activity of bats is constrained by predation in bright light, and that crepuscular insects exploit this constr...Continue Reading

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Citations

Aug 8, 2020·Ecology and Evolution·Ruben EvensBart Kempenaers
Jun 30, 2019·Optics Express·Jim LarssonMikkel Brydegaard
Aug 6, 2020·Optics Express·Yiyun LiMarlan O Scully
May 20, 2020·Science Advances·Mikkel BrydegaardCarsten Kirkeby
Sep 24, 2020·Pest Management Science·Andrzej BieganowskiAndreas Garz
Mar 5, 2021·PloS One·Samuel JanssonMikkel Brydegaard
Oct 6, 2021·Biological Reviews of the Cambridge Philosophical Society·Marcus W RhodesIlya M D Maclean

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Software Mentioned

Lidar

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