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bioacoustics articles: J Mammalogy 85(2)

Subject: bioacoustics articles: J Mammalogy 85(2)
From: Brian Mitchell <>
Date: Fri, 07 May 2004 10:24:02 -0700
<tt>Here are the bioacoustics articles from J Mammalogy 85(2).  I've downloaded 
 PDFs of all articles in this e-mail, and will save them for a few weeks. If 
 list members need copies feel free to e-mail me a request.</tt><br>
 <tt><br>Broders, Hugh G., C. Scott Findlay, and Ligang Zheng. 2004. Effects of 
 clutter on echolocation call structure of Myotis septentrionalis and M. 
 lucifugus. Journal of Mammalogy, 85(2):273-281.</tt><br>
 <tt>ABSTRACT: The structure of echolocation calls, and the distance over which 
 bats perceive their environment, varies with the amount of structural 
 clutter through which they are flying. Clutter and species had significant 
 effects on the frequency-time characteristics of search-phase echolocation 
 calls of northern long-eared (Myotis septentrionalis) and little brown bats 
 (M. lucifugus). We tested an a priori derived model that predicted the 
 pattern of differences in echolocation call variable values among clutter 
 categories would provide insight into the relative maximum distances that 
 bat species could perceive using echolocation. Specifically, the model 
 predicted that species adapted to flying and foraging in cluttered habitats 
 would have a shorter maximum perceptual distance than species adapted to 
 flying and foraging in uncluttered habitats. The results supported this 
 model and suggest the clutter-adapted M. septentrionalis had a shorter 
 maximum perceptual distance than M. lucifugus, a species known to forage in 
 a variety of habitats but mainly in uncluttered areas (i.e., over water). 
 Using calls as the sampling unit, a neural network correctly 
 classified >94% of the echolocation calls to species in high clutter. In 
 medium and low clutter, >82% of the calls were correctly classified to 
 species; however >90% correct classification was achieved by leaving <30% 
 of calls unclassified. Researchers should develop clutter-specific call 
 libraries to improve species classification accuracy for echolocation 
 <tt><br>Mandelli, Marie-Juliette, and Gillian Sales. 2004. Ultrasonic 
 of infant short-tailed field voles, Microtus agrestis. Journal of 
 Mammalogy, 85(2):282-289.</tt><br>
 <tt>ABSTRACT: Ultrasonic vocalizations of infant rodents are used in 
 developmental studies and for investigating the effects of drugs or 
 environmental pollutants. Few studies, however, have analyzed the frequency 
 characteristics of these ultrasonic vocalizations. This study investigates 
 the physical and vocal development of infants (1?14 days old) of the 
 short-tailed field vole, Microtus agrestis, under 2 conditions of 
 isolation: at 23 degrees C immediately after being isolated from the nest 
 or at 23 degrees C after 10 min of isolation at 27 degrees C. Seventy-three 
 percent of the infants vocalized, and there was great variation among 
 calling infants in the number of vocalizations emitted. More infants, 
 especially males, called during the 2nd period of isolation than during the 
 1st, and latency to call increased with age in males. The ultrasonic 
 vocalizations were comparable to those recorded from North American voles. 
 Vocalizations were classified into 7 categories on the basis of 
 characteristics of the fundamental frequency. Simple calls were emitted 
 most commonly and became more frequent in older infants, whereas the 
 proportion of calls with a down-sweep in frequency and audible clicks 
 decreased with age. The emission of ultrasonic calls, therefore, appears to 
 reflect changes both in physical development of the infants and in their 
 external environment.</tt><br>
 <tt><br>Schleich, Cristian Eric, and Cristina Busch. Functional morphology of 
 middle ear of Ctenomys talarum (Rodentia: Octodontidae). Journal of 
 Mammalogy, 85(2):290-295.</tt><br>
 <tt>ABSTRACT: The middle ear of the solitary subterranean rodent Ctenomys 
 talarum was studied. The most significant features observed were the 
 enlarged middle-ear cavity, a round and larger eardrum without pars 
 flaccida, no connection between malleus and the tympanic bone, partial 
 fusion of malleus with incus, a nearly flat stapedial footplate, absence of 
 stapedial artery, reduced tensor tympani, and absence of stapedial muscle. 
 Some of these features are shared with unrelated subterranean rodents like 
 Spalax ehrenbergi and geomyids, possibly as adaptations for low-frequency 
 <tt><br>There was also a book review of Kunz and Fenton, 2003, Bat Ecology 
 of Mammalogy, 85(2):366-367).  I've downloaded a PDF of this as well for 
 interested list members.</tt><br>
 Brian R. Mitchell<br>
 Post-Doctoral Associate<br>
 University of Vermont<br>
 The Rubenstein School of Environment and Natural Resources<br>
 George D. Aiken Center<br>
 81 Carrigan Drive<br>
 Burlington, VT  05405-0088<br>
 (802) 656-2496<br>

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