| Source levels of echolocation signals vary in correlation with wingbeat cycle in landing big brown bats (Eptesicus fuscus). | |
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MedLine Citation:
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PMID: 20833918 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Recordings of the echolocation signals of landing big brown bats with a two-dimensional 16-microphone array revealed that the source level reduction of 7 dB per halving of distance is superimposed by a variation of up to 12 dB within single call groups emitted during the approach. This variation correlates with the wingbeat cycle. The timing of call emission correlates with call group size. First pulses of groups containing many calls are emitted earlier than first calls in groups with fewer calls or single calls. This suggests that the emission of pulse groups follows a fixed motor pattern where the information gained from the preceding pulse group determines how many calls will be emitted in the next group. Single calls and call groups are centred at the middle of the upstroke. Expiration is indicated by call emission. The pause between groups is centred at the middle of the downstroke and indicates inspiration. The hypothesis that the source level variation could be caused by changes in the subglottic pressure due to the contraction of the major flight muscles is discussed. |
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Authors:
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Jens C Koblitz; Peter Stilz; Hans-Ulrich Schnitzler |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of experimental biology Volume: 213 ISSN: 1477-9145 ISO Abbreviation: J. Exp. Biol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-13 Completed Date: 2011-01-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 3263-8 Citation Subset: IM |
Affiliation:
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Animal Physiology, Institute for Neurobiology, University of Tübingen, Auf der Morgenstelle 28, 72076 Tübingen, Germany. jens.koblitz@uni-tuebingen.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biophysical Phenomena Chiroptera / physiology* Echolocation / physiology* Female Flight, Animal / physiology* Glottis / physiology Male Pressure Respiration Time Factors Wing / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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