Ventilatory behaviors of the toad Bufo marinus revealed by coherence analysis
Braz. j. biol
;
63(1): 27-34, Feb. 2003. ilus
Article
in English
| LILACS
| ID: lil-343408
ABSTRACT
Breathing in amphibians is a remarkably complex behavior consisting of irregular breaths that may be taken singly or in bouts that are used to deflate and inflate the lungs. The valves at the two outlets of the buccal cavity (nares and glottis) need to be finely controlled throughout the bout for the expression of these complex respiratory behaviors. In this study, we use a technique based on the calculation of the coherence spectra between respiratory variables (buccal pressure; narial airflow; and lung pressure). Coherence was also used to quantify the effects of chemoreceptor and pulmonary mechanoreceptor input on narial and glottal valve behavior on normoxic, hypoxic, and hypercapnic toads with both intact and bilaterally sectioned pulmonary vagi. We found a significant reduction in narial coherence in hypoxic vagotomized toads indicating that pulmonary mechanoreceptor feedback modulates narial opening duration. An unexpectedly high coherence between Pl and Pb during non-respiratory buccal oscillations in hypercapnic toads indicated more forceful use of the buccal pump. We concluded that the coherence function reveals behaviors that are not apparent through visual inspection of ventilatory time series
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Respiratory Physiological Phenomena
/
Bufo marinus
/
Chemoreceptor Cells
Limits:
Animals
Language:
English
Journal:
Braz. j. biol
Journal subject:
Biology
Year:
2003
Type:
Article
/
Project document
Affiliation country:
United States
Institution/Affiliation country:
University of Texas at Arlington/US
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