@article {48148, title = {Global warming alters sound transmission: differential impact on the prey detection ability of echolocating bats}, journal = {Journal of The Royal Society Interface}, volume = {11}, year = {2013}, month = {Feb-07-20132184}, abstract = {

Climate change impacts the biogeography and phenology of plants and ani- mals, yet the underlying mechanisms are little known. Here, we present a functional link between rising temperature and the prey detection ability of echolocating bats. The maximum distance for echo-based prey detection is physically determined by sound attenuation. Attenuation is more pronoun- ced for high-frequency sound, such as echolocation, and is a nonlinear function of both call frequency and ambient temperature. Hence, the prey detection ability, and thus possibly the foraging efficiency, of echolocating bats and susceptible to rising temperatures through climate change. Using present-day climate data and projected temperature rises, we modelled this effect for the entire range of bat call frequencies and climate zones around the globe. We show that depending on call frequency, the prey detection volume of bats will either decrease or increase: species calling above a cross- over frequency will lose and species emitting lower frequencies will gain prey detection volume, with crossover frequency and magnitude depending on the local climatic conditions. Within local species assemblages, this may cause a change in community composition. Global warming can thus directly affect the prey detection ability of individual bats and indirectly their interspecific interactions with competitors and prey.

}, keywords = {echolocation, foraging, global warming, sensory ecology, species interactions}, issn = {1742-5689}, doi = {10.1098/rsif.2013.0961}, url = {http://rsif.royalsocietypublishing.org/cgi/doi/10.1098/rsif.2013.0961https://syndication.highwire.org/content/doi/10.1098/rsif.2013.0961}, author = {Luo, J. and Koselj, K. and Zsebok, S. and Siemers, B. M. and Goerlitz, H. R.} } @article {20917, title = {Frequency tuning and directional sensitivity of tympanal vibrations in the field cricket Gryllus bimaculatus}, journal = {Journal of The Royal Society Interface}, volume = {14}, year = {2017}, month = {Dec-28-20172018}, pages = {20170035}, abstract = {

Female field crickets use phonotaxis to locate males by their calling song. Male song production and female behavioural sensitivity form a pair of matched frequency filters, which in Gryllus bimaculatus are tuned to a frequency of about 4.7 kHz. Directional sensitivity is supported by an elaborate system of acoustic tracheae, which make the ears function as pressure difference receivers. As a result, phase differences between left and right sound inputs are transformed into vibration amplitude differences. Here we critically tested the hypothesis that acoustic properties of internal transmissions play a major role in tuning directional sensitivity to the calling song frequency, by measuring tympanal vibrations as a function of sound direction and frequency. Rather than sharp frequency tuning of directional sensitivity corresponding to the calling song, we found broad frequency tuning, with optima shifted to higher frequencies. These findings agree with predictions from a vector summation model for combining external and internal sounds. We show that the model provides robust directional sensitivity that is, however, broadly tuned with an optimum well above the calling song frequency. We therefore advocate that additional filtering, e.g. at a higher (neuronal) level, significantly contributes to frequency tuning of directional sensitivity.

}, issn = {1742-5689}, doi = {10.1098/rsif.2017.0035}, url = {http://rsif.royalsocietypublishing.org/lookup/doi/10.1098/rsif.2017.0035https://syndication.highwire.org/content/doi/10.1098/rsif.2017.0035}, author = {Lankheet, Martin J. and Cerkvenik, Uro{\v s} and Ole N{\ae}sbye Larsen and van Leeuwen, Johan L.} }