@article {57412, title = {Flight and hearing: ultrasound sensitivity differs between flight-capable and flight-incapable morphs of a wing-dimorphic cricket species}, year = {2007}, abstract = {

We studied frequency sensitivity of flight-capable and flight-incapable forms of the wing-dimorphic cricket Gryllus texensis, using both behavioral and neurophysiological measurements. Behavioral thresholds for negative phonotaxis in response to ultrasound stimuli are lower for long-winged (i.e. flight-capable) crickets than for short-winged (flight-incapable) individuals, whereas thresholds for positive phonotaxis in response to a calling-song model do not differ. Similarly, thresholds of the identified interneurons ON1 and AN2 differ between flight morphs for high sound frequencies but not for the frequency of calling song. Our results show that sensitivity to ultrasound is closely linked to flight ability, and thus to the risk of predation from aerially hawking bats. We suggest that sensitivity to ultrasound is one of a suite of flight-associated characteristics, the development of which may be under common hormonal regulation.

}, keywords = {bat predation, juvenile hormone, phonotaxis}, doi = {10.1242/jeb.008136}, url = {http://jeb.biologists.org/cgi/doi/10.1242/jeb.008136https://syndication.highwire.org/content/doi/10.1242/jeb.008136}, author = {Gerald S. Pollack and Martins, R.} } @article {52731, title = {Two new katydids of the genus Melanonotus from Costa Rica with Comments on their life history strategies (Tettigoniidae pseudophyllinae)}, journal = {Entomological News}, volume = {86}, year = {1975}, pages = {129-140}, chapter = {129}, abstract = {

Two new katydids are described from Costa Rica extending the known range of\ Melanonotus\ northward. The contrast in life history and morphology between primary forest katydids and secondary growth or temperate species is discussed. The absence of regular nightly stridulation and morphological differences such as the extremely long antennae of the two\ Melanonotus\ species and other primary forest epiphyllic katydids are suggested as adaptations to bat predation.

}, keywords = {bat predation, behaviour, Costa Rica, Melanonotus, Pseudophyllinae, Tettigoniidae}, author = {D. C. F. Rentz} }