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Echolocation and passive listening by foraging mouse-eared bats Myotis myotis and M. blythii.
J Exp Biol. 2007 Jan; 210(Pt 1):166-76.JE

Abstract

The two sibling mouse-eared bats, Myotis myotis and M. blythii, cope with similar orientation tasks, but separate their trophic niche by hunting in species-specific foraging microhabitats. Previous work has shown that both species rely largely on passive listening to detect and glean prey from substrates, and studies on other bat species have suggested that echolocation is ;switched off' during passive listening. We tested the hypothesis that mouse-eared bats continuously emit echolocation calls while approaching prey. Echolocation may be needed for orientation while simultaneously listening for prey. Because these sibling species forage in different microhabitats and eat different prey, we also compared their echolocation behaviour and related it to their ecology. Both species used echolocation throughout prey approach, corroborating a functional role for echolocation during gleaning. Captive bats of both species emitted similar orientation calls, and pulse rate increased during prey approach. Between the search to approach phases, call amplitude showed a sudden, dramatic drop and bats adopted ;whispering echolocation' by emitting weak calls. Whispering echolocation may reduce the risks of masking prey-generated sounds during passive listening, the mouse-eared bats' main detection tactic; it may also avoid alerting ultrasound-sensitive prey. In several cases M. myotis emitted a loud buzz made of 2-18 components when landing. We hypothesise that the buzz, absent in M. blythii at least when gleaning from the same substrate, is used to assess the distance from ground and refine the landing manoeuvre. Our findings have implications for niche separation between sibling species of echolocating bats, support a role for echolocation during passive listening and suggest a functional role for buzzes in landing control.

Authors+Show Affiliations

Laboratorio di Ecologia Applicata, Dipartimento Ar.Bo.Pa.Ve., Facoltà di Agraria, Università degli Studi di Napoli Federico II, via Università 100, I-80055 Portici (Napoli), Italy. danrusso@unina.itNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17170159

Citation

Russo, Danilo, et al. "Echolocation and Passive Listening By Foraging Mouse-eared Bats Myotis Myotis and M. Blythii." The Journal of Experimental Biology, vol. 210, no. Pt 1, 2007, pp. 166-76.
Russo D, Jones G, Arlettaz R. Echolocation and passive listening by foraging mouse-eared bats Myotis myotis and M. blythii. J Exp Biol. 2007;210(Pt 1):166-76.
Russo, D., Jones, G., & Arlettaz, R. (2007). Echolocation and passive listening by foraging mouse-eared bats Myotis myotis and M. blythii. The Journal of Experimental Biology, 210(Pt 1), 166-76.
Russo D, Jones G, Arlettaz R. Echolocation and Passive Listening By Foraging Mouse-eared Bats Myotis Myotis and M. Blythii. J Exp Biol. 2007;210(Pt 1):166-76. PubMed PMID: 17170159.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Echolocation and passive listening by foraging mouse-eared bats Myotis myotis and M. blythii. AU - Russo,Danilo, AU - Jones,Gareth, AU - Arlettaz,Raphaël, PY - 2006/12/16/pubmed PY - 2007/4/11/medline PY - 2006/12/16/entrez SP - 166 EP - 76 JF - The Journal of experimental biology JO - J. Exp. Biol. VL - 210 IS - Pt 1 N2 - The two sibling mouse-eared bats, Myotis myotis and M. blythii, cope with similar orientation tasks, but separate their trophic niche by hunting in species-specific foraging microhabitats. Previous work has shown that both species rely largely on passive listening to detect and glean prey from substrates, and studies on other bat species have suggested that echolocation is ;switched off' during passive listening. We tested the hypothesis that mouse-eared bats continuously emit echolocation calls while approaching prey. Echolocation may be needed for orientation while simultaneously listening for prey. Because these sibling species forage in different microhabitats and eat different prey, we also compared their echolocation behaviour and related it to their ecology. Both species used echolocation throughout prey approach, corroborating a functional role for echolocation during gleaning. Captive bats of both species emitted similar orientation calls, and pulse rate increased during prey approach. Between the search to approach phases, call amplitude showed a sudden, dramatic drop and bats adopted ;whispering echolocation' by emitting weak calls. Whispering echolocation may reduce the risks of masking prey-generated sounds during passive listening, the mouse-eared bats' main detection tactic; it may also avoid alerting ultrasound-sensitive prey. In several cases M. myotis emitted a loud buzz made of 2-18 components when landing. We hypothesise that the buzz, absent in M. blythii at least when gleaning from the same substrate, is used to assess the distance from ground and refine the landing manoeuvre. Our findings have implications for niche separation between sibling species of echolocating bats, support a role for echolocation during passive listening and suggest a functional role for buzzes in landing control. SN - 0022-0949 UR - https://www.unboundmedicine.com/medline/citation/17170159/Echolocation_and_passive_listening_by_foraging_mouse_eared_bats_Myotis_myotis_and_M__blythii_ L2 - http://jeb.biologists.org/cgi/pmidlookup?view=long&pmid=17170159 DB - PRIME DP - Unbound Medicine ER -