01899nas a2200193 4500008004100000022001400041245013000055210007000185260001600255300001400271490000800285520125900293100002301552700002101575700002201596700002301618700002401641856004001665 2009 eng d a0001-496600aAcoustic radiation patterns of mating calls of the túngara frog (Physalaemus pustuosus): Implications for multiple receivers0 aAcoustic radiation patterns of mating calls of the túngara frog  cNov-01-2009 a2757-27670 v1263 a

In order for a signal to be transmitted from a sender to a receiver, the receiver must be within theactive space of the signal. If patterns of sound radiation are not omnidirectional, the position as wellas the distance of the receiver relative to the sender is critical. In previous measurements of thehorizontal directivity of mating calls of frogs, the signals were analyzed using peak orroot-mean-square analysis and resulted in broadband directivities that ranged from negligible to amaximum of approximately 5 dB. Idealized laboratory measurements of the patterns of acousticradiation of the mating calls of male túngara frogs Physalaemus pustulosus, along axes relevant tothree receivers in this communication network, female frogs in the horizontal plane, and frog-eatingbats and blood-sucking flies above the ground, are reported. The highest sound pressure level wasradiated directly above the frog, with a 6 dB reduction radiated along the horizontal direction.Band-limited directivities were significantly greater than broadband directivities, with a maximumdirectivity of 20 dB in the vertical plane for harmonics near 6 kHz. The implications with regard tomating and predator-prey interactions are discussed.

1 aBernal, Ximena, E.1 aPage, Rachel, A.1 aRyan, Michael, J.1 aArgo, Theodore, F.1 aWilson, Preston, S. uhttp://dx.doi.org/10.1121/1.321292901322nas a2200181 4500008004100000022001400041245009100055210006900146260001600215300001800231490000800249520073700257100002100994700002501015700002401040700002501064856005101089 2017 eng d a0001-496600aMeasurement of low-frequency tissue response of the seagrass Posidonia oceanica0 aMeasurement of lowfrequency tissue response of the seagrass iPos cJan-05-2017 aEL433 - EL4380 v1413 a

A one-dimensional acoustic resonator technique was used to study leaves of the Mediterranean seagrass species Posidonia oceanica collected from Crete and Sicily. The leaf blades were finely divided, mixed with artificial seawater, and degassed to create a suspension of tissue independent of leaf structure and free bubbles or internal voids. The low-frequency (1 to 8 kHz) bulk modulus of the leaf tissue was inferred from the acoustic measurements and independent density measurements. The measured density of the seagrass tissue was 960 ± 20 kg/m3 which agrees with previously published values. The inferred bulk modulus was 2.1 GPa with 90% confidence limits 1.0–5.0 GPa.

1 aJohnson, Jay, R.1 aVenegas, Gabriel, R.1 aWilson, Preston, S.1 aHermand, Jean-Pierre uhttp://asa.scitation.org/doi/10.1121/1.4981925