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Keywords: Frequency
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Journal Articles
J Exp Biol (2019) 222 (20): jeb204172.
Published: 23 October 2019
... frequency and cruising speed for individual whales spanning a threefold variation in body length, corresponding to an order of magnitude variation in estimated body mass. Our results showed that oscillatory frequency decreases with body length (∝length −0.53 ) while cruising speed remains roughly invariant...
Includes: Supplementary data
Journal Articles
Journal Articles
J Exp Biol (2016) 219 (14): 2173–2181.
Published: 15 July 2016
... the average amount of disorder in each frequency bin within the sound sample ( Charif et al., 2010 ). Calculations were restricted to sound selections of equal duration (time) and bandwidth (frequency) across all recordings (Hann window size=1300 samples; 2048-sample FFT frequency grid) and were targeted...
Journal Articles
Journal Articles
J Exp Biol (2009) 212 (13): 2023–2026.
Published: 1 July 2009
...Eric Parmentier; Orphal Colleye; David Mann SUMMARY Clownfish live in social groups in which there is a size-based dominance hierarchy. In such a context, sonic cues could play a role in social organisation because dominant frequency and pulse length of sounds are strongly correlated with fish size...
Journal Articles
J Exp Biol (2009) 212 (4): 566–575.
Published: 15 February 2009
...Michael S. Caldwell; J. Gregory McDaniel; Karen M. Warkentin SUMMARY Incidental acoustic and vibrational cues generated by predators are a potential source of information for prey assessing risk. Substrate vibrations should be excited by most predators, and frequency, amplitude or temporal...
Journal Articles
J Exp Biol (2003) 206 (11): 1833–1843.
Published: 1 June 2003
...Gabriël J. L. Beckers; Roderick A. Suthers; Carel ten Cate SUMMARY Birdsong assumes its complex and specific forms by the modulation of phonation in frequency and time domains. The organization of control mechanisms and intrinsic properties causing such modulation have been studied in songbirds...
Journal Articles
J Exp Biol (2002) 205 (23): 3641–3650.
Published: 1 December 2002
... potential (AP)pulses at frequencies that correspond to trout heart rates in vivo at 7°C, 14°C and 21°C. Additionally, [Ca 2+ ] i and I Ca were examined with square (SQ) pulses at slow (0.2 Hz) and physiologically relevant contraction frequencies. The amplitude of[Ca 2+ ] i decreased with increasing...
Journal Articles
J Exp Biol (2002) 205 (17): 2615–2626.
Published: 1 September 2002
...R. D. Bullen; N. L. McKenzie SUMMARY Wingbeat frequency ( f w ) and amplitude(θ w ) were measured for 23 species of Australian bat,representing two sub-orders and six families. Maximum values were between 4 and 13 Hz for f w , and between 90 and 150° forθ w , depending on the species. Wingbeat...
Journal Articles
J Exp Biol (2002) 205 (5): 697–706.
Published: 1 March 2002
.... Differences in myocardial Ca 2+ handling between fish and mammals suggest a greater energy cost of activation in fish. Further, while there is considerable evidence that heart rate (or cycle frequency) should have a profound effect on the efficiency of teleost cardiac muscle, this effect has been largely...
Journal Articles
J Exp Biol (2001) 204 (16): 2827–2841.
Published: 15 August 2001
...W. J. BAILEY; H. C. BENNET-CLARK; N. H. FLETCHER SUMMARY For most insects, size determines the call frequency. This paper describes the acoustics of a small brachypterous cricket ( Rufocephalus sp.;body length 9.6 mm) producing a call with a carrier frequency of approximately 3.2 kHz from...
Journal Articles
J Exp Biol (2000) 203 (9): 1503–1512.
Published: 1 May 2000
... electromyograms. Single, simultaneous twitches of the bilateral sonic muscles produce a single sound pulse consisting of a two-to three-cycle acoustic waveform. Typical disturbance calls at 18 °C consist of trains of 2–15 pulses with a sound pressure level (SPL) of 74 dB re 20 μPa at 10 cm, a peak frequency...
Journal Articles
J Exp Biol (1999) 202 (22): 3225–3237.
Published: 15 November 1999
...Mahasweta Girgenrath; Richard L. Marsh ABSTRACT Sound-producing muscles provide the opportunity of studying the limits of power production at high contractile frequencies. We used the work loop technique to determine the power available from the external oblique muscles in two related species...
Journal Articles
Journal Articles
J Exp Biol (1997) 200 (24): 3101–3108.
Published: 15 December 1997
... with high sound intensity, but the sound pulse frequency within calls in H. chrysoscelis is twice that in H. versicolor . In both species, sound pulse frequency is directly correlated with the active contractions of the trunk muscles. The length trajectory during contraction and relaxation displays a saw...
Journal Articles
Journal Articles
J Exp Biol (1991) 161 (1): 285–298.
Published: 1 November 1991
... in the male bat. Wingbeat frequency increased with total mass or wing loading, varying as M 0.61 in the female and M 0.44 in the male bat. Hence frequency, but not speed, changed with mass in the direction predicted by aerodynamic theory. These results were used in a mathematical model to predict wingbeat...
Journal Articles
J Exp Biol (1990) 150 (1): 171–185.
Published: 1 May 1990
...C. J. Pennycuick ABSTRACT Wingbeat frequencies were observed in the field for 32 morphologically diverse bird species, representing 18 families, and ranging in mass from 20 g to nearly 5 kg. A combination of multiple regression and dimensional analysis was used to show that wingbeat frequency ( f...