scholarly journals Bioacoustic variation of swimbladder disturbance sounds in Neotropical doradoid catfishes (Siluriformes: Doradidae, Auchenipteridae): Potential morphological correlates

2012 ◽  
Vol 58 (1) ◽  
pp. 171-188 ◽  
Author(s):  
Ingrid M. Kaatz ◽  
Donald J. Stewart
Keyword(s):  
Inner Ear ◽  
Morphological Traits ◽  
Dominant Frequency ◽  
Frequency Variation ◽  
Swim Bladder ◽  
Frequency Sound ◽  
Temporal Intervals ◽  
Bladder Diverticula ◽  
Somatic Index ◽  
Elastic Spring

Abstract Swimbladder disturbance sounds of doradoid catfishes (Doradidae and Auchenipteridae) demonstrated striking waveform and spectrographic variation. We surveyed sounds of 25 doradoid species in 20 genera comparing these to sounds of four vocal outgroup catfish families. Sounds were either continuous waveforms (lacking interpulses) or pulsed (groups of pulses repeated at fixed temporal intervals). This is the first evidence for swimbladder calls with fixed interpulse patterns in catfishes. Vocal mechanism components that were similar between doradids and auchenipterids included: swimbladder shape, swimbladder dimensions and sonic muscle-somatic index. Morphological traits that showed variation among taxa and were evaluated for potential correlates of call diversity are: 1) diverticula (marginal outpocketings of the swimbladder with no connection to inner ear) and 2) elastic spring apparatus Müllerian rami (ESA-Mr). Within the doradid subfamilies and within the Auchenipteridae most species differed significantly in dominant frequency with frequency ranges overlapping to some extent for most. Doradid swim-bladder diverticula did not explain dominant frequency variation within the doradoid superfamily. Some doradids with conical ESA-Mr had the highest dominant frequency sounds. Auchenipterids included both relatively lower and higher dominant frequency sound producers but lacked diverticula and had discoidal ESA-Mr. Comparing a phylogeny of doradoid genera with out-group taxa, we infer that complex diverticula and conical ESA-Mr are derived characters within the Doradidae. Species representing outgroup families produced either continuous lower dominant frequency sounds (aspredinids, mochokids and pseu-dopimelodids) or pulsed higher dominant frequency sounds (pimelodids).

Frequency modulation within electrocardiograms during ventricular fibrillation

2000 ◽  
Vol 279 (2) ◽  
pp. H825-H835 ◽  
Author(s):  
Abhijit Patwardhan ◽  
Sachin Moghe ◽  
Ke Wang ◽  
Fabio Leonelli
Keyword(s):  
Ventricular Fibrillation ◽  
Body Surface ◽  
Dominant Frequency ◽  
The Body ◽  
Frequency Variation ◽  
Refractory Periods ◽  
Analysis Technique ◽  
Before And After ◽  
Average Variation ◽  
Dominant Frequencies

Periods of reentrant activation and effective refractory periods are correlated with dominant frequency or reciprocal of cycle periods during ventricular fibrillation (VF). In the present study, we used an analysis technique based on Wigner transforms to quantify time-varying dominant frequencies in electrocardiograms (ECGs) during VF. We estimated dominant frequencies within orthogonal ECGs recorded in 10 dogs during trials of 10 s of VF and in 9 dogs during trials of 30 s of VF. In four additional dogs, we compared dominant frequencies during 10 s of VF before and after administration of amiodarone. Our results showed the following. 1) There was substantial frequency variation or modulation within the ECGs during 10 and 30 s of VF, the average variation being ±15% from the mean frequency. Amiodarone decreased mean frequencies ( P < 0.05) as expected; however, amiodarone also decreased the variation in frequencies ( P < 0.05). 2) During 30 s of VF, the dominant frequencies increased continuously from 7.3 to 8.1 Hz ( P < 0.05). The increase in frequency was almost linear with a rate of 0.022 Hz/s ( r 2 = 0.93, P < 0.0005). 3) Modulation of frequencies during the first and the last one-half of 30 s of VF was not different. Average (in time) mean frequencies and modulation of frequencies were similar in all three ECGs. 4) Although the averages were similar, during any VF episode, dominant frequencies in ECGs recorded from different locations on the body surface were similar to each other at some times and markedly different from each other at other times. We conclude that during VF, 1) frequencies in ECGs vary considerably and continuously, and amiodarone decreases this variation; 2) mean frequencies increase linearly during first 30 s; 3) the variability in frequency does not change during 30 s; and 4) at any given time, the frequencies within spatially different body surface ECGs can be either similar or markedly different.

scholarly journals Intra- and Intersexual swim bladder dimorphisms in the plainfin midshipman fish (Porichthys notatus): Implications of swim bladder proximity to the inner ear for sound pressure detection

2017 ◽  
Vol 278 (11) ◽  
pp. 1458-1468 ◽  
Author(s):  
Robert A. Mohr ◽  
Elizabeth A. Whitchurch ◽  
Ryan D. Anderson ◽  
Paul M. Forlano ◽  
Richard R. Fay ◽  
...  
Keyword(s):  
Inner Ear ◽  
Sound Pressure ◽  
Swim Bladder ◽  
Porichthys Notatus ◽  
Plainfin Midshipman

The aggressive call of Dendropsophus cruzi (Pombal & Bastos, 1998) (Anura; Hylidae) in Central Brazil

Zootaxa ◽  
2018 ◽  
Vol 4379 (1) ◽  
pp. 137 ◽  
Author(s):  
TAINÃ LUCAS ANDREANI ◽  
SEIXAS REZENDE OLIVEIRA ◽  
VINÍCIUS GUERRA ◽  
ROGÉRIO PEREIRA BASTOS ◽  
ALESSANDRO RIBEIRO DE MORAIS
Keyword(s):  
Dominant Frequency ◽  
Advertisement Call ◽  
Frequency Variation ◽  
Geographic Pattern ◽  
Santa Cruz ◽  
Acoustic Parameters ◽  
Central Brazil ◽  
The Social ◽  
Vocalization Type ◽  
Forested Areas

Dendropsophus cruzi (Pombal & Bastos, 1998) is a small hylid (male snout-to-vent length = 16.3–19.4 mm; female SVL = 21.3–25.0 mm) that is allocated in the D. microcephalus group (Faivovich et al. 2005). It is commonly found in Open and forested areas from Central Brazil to Provincia Velasco, Departamento de Santa Cruz, Bolivia (Frost 2017; Tessarolo et al. 2016). Pombal & Bastos (1998) described the advertisement call of D. cruzi as a single pulsed note. Posteriorly, studies uncovered relationships between dominant frequency variation in the advertisement calls of D. cruzi and variation in the SVL and mass of males (Bastos et al. 2003), as well as the existence of a clinal geographic pattern in the variation of acoustic parameters of these calls (Tessarolo et al. 2016). However, the acoustic communication in anurans is usually mediated by more than one vocalization type (Toledo et al. 2015). Due the importance of call types in the social context of anurans (e.g., Reichert 2011; Forti et al. 2017), we expand the vocal repertoire of D. cruzi by describing its aggressive call. 

scholarly journals The laterophysic connection in chaetodontid butterflyfish: morphological variation and speculations on sensory function

2000 ◽  
Vol 355 (1401) ◽  
pp. 1125-1129 ◽  
Author(s):  
Jacqueline F. Webb ◽  
W. Leo Smith
Keyword(s):  
Sexual Dimorphism ◽  
Inner Ear ◽  
Lateral Line ◽  
Morphological Variation ◽  
Sensory Function ◽  
Pressure Sensitivity ◽  
Swim Bladder ◽  
Canal System ◽  
Lateral Line Canal ◽  
Diverse Species

The laterophysic connection is a novel specialization in chaetodontid butterflyfish, in which paired diverticula of the swim–bladder (‘horns’) extend anteriorly and approach or directly contact a medial fossa in the lateral line canal contained within the supracleithrum. This study examined the morphology of the laterophysic connection in eight ecologically diverse species belonging to five subgenera within Chaetodon . Two types of laterophysic connections, indirect and direct, were found among Chaetodon species. Intraspecific variation (including sexual dimorphism) in the morphology of the laterophysic connection was not found. The type of laterophysic connection is not correlated with ecological characteristics among Chaetodon species, but appears to be correlated with subgeneric affinities of Chaetodon species. The presence of swim–bladder horns probably increases pressure sensitivity to the inner ear. It is suggested that the presence of a direct laterophysic connection, and possibly an indirect laterophysic connection, imparts pressure sensitivity to the lateral line canal system as well.

High Resolution Time-Frequency Analysis Base on Ricker Atom Matching Pursuit Decomposition

2013 ◽  
Vol 284-287 ◽  
pp. 3115-3119
Author(s):  
Wei Song ◽  
Jia Hui Zuo ◽  
Peng Cheng Hu
Keyword(s):  
Frequency Analysis ◽  
Matching Pursuit ◽  
Low Frequency ◽  
Seismic Signal ◽  
Dominant Frequency ◽  
Frequency Resolution ◽  
Frequency Variation ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
The Impact

The high accuracy time-frequency representation of non-stationary signals is one of the key researches in seismic signal analysis. Low-frequency part of the seismic data often has a higher frequency resolution, on the contrary it tends to have lower frequency resolution in the high frequency part. It’s difficult to fine characterize the time-frequency variation of non-stationary seismic signals by conventional time-frequency analysis methods due to the limitation of the window function. Therefore based on the Ricker wavelet, we put forward the matching pursuit seismic trace decomposition method. It decomposes the seismic records into a series of single component atoms with different centre time, dominant frequency and energy, by making use of the Wigner-Ville distribution, has the time-frequency resolution of seismic signal reach the limiting resolution of the uncertainty principle and skillfully avoid the impact of interference terms in conventional Wigner-Ville distribution.

scholarly journals Audition in sciaenid fishes with different swim bladder-inner ear configurations

2006 ◽  
Vol 119 (1) ◽  
pp. 439-443 ◽  
Author(s):  
John U. Ramcharitar ◽  
Dennis M. Higgs ◽  
Arthur N. Popper
Keyword(s):  
Inner Ear ◽  
Swim Bladder
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