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J Mammalogy 85(1) bioacoustics articles

Subject: J Mammalogy 85(1) bioacoustics articles
From: Brian Mitchell <>
Date: Mon, 08 Mar 2004 11:43:30 -0800
<tt>Here are the bioacoustics articles from J Mammalogy 85(1).  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>Ibáñez, Carlos, Javier Juste, Ricardo López-Wilchis, and Arturo 
 Núñez-Garduño.  2004.  Habitat variation and jamming avoidance in 
 echolocation calls of the Sac-Winged Bat (Balantiopteryx plicata).  Journal 
 of Mammalogy 85(1):38-42.<br>
 ABSTRACT: We have studied the effect of habitat and presence of 
 conspecifics on echolocation characteristics of the emballonurid bat 
 Balantiopteryx plicata. Calls during the search phase only showed 
 differences between habitats in bandwidth, as has been found for other 
 open-space bats. Characteristics of calls during the approach phase did 
 change when bats entered open areas. Calls in the terminal phase showed no 
 differences in the characters examined between habitats. Bats flying in 
 groups shifted their peak frequency significantly, which maximized 
 differences between individuals. These results are interpreted as an active 
 mechanism of jamming avoidance. Bats flying in groups also tended to 
 increase the mean of peak frequencies.</tt><br>
 <tt>Eiler, Karen Christine, and Sandra Anne Banack.  2004.  Variability in the 
 alarm call of Golden-Mantled Ground Squirrels (Spermophilus lateralis and 
 S. saturatus).  Journal of Mammalogy 85(1):43-50.<br>
 ABSTRACT:  Many animals have geographic variation or dialect differences in 
 their vocalizations. These differences combined with social behavior and 
 isolation can contribute to speciation. We compared the acoustic 
 vocalizations of 3 subspecies of Spermophilus lateralis and those of S. 
 saturatus using wild-caught animals in the presence of a predator, Canis 
 lupus familiarus. Variation was examined using 9 sonogram variables. We 
 found both local dialect differences and geographic variation in alarm 
 calls. S. saturatus could be distinguished 100% of the time from S. 
 lateralis using discriminant analysis. Widespread use of ultrasonic 
 vocalizations was found in both S. lateralis and S. saturatus. Dialect 
 differences showed a pattern of character displacement between adjacent 
 subspecies. Vocalization parameters changed within local sites and between 
 years, suggesting alarm calling is at least partially a learned behavior. 
 Species share more uniquely defining vocalization variables than either 
 subspecies or local populations.</tt><br>
 <tt>Keeley, Annika T. H., and Brian W. Keeley.  2004.  The mating system of 
 Tadarida brasilensis (chiroptera: molossidae) in a large highway bridge 
 colony.  Journal of Mammalogy 85(1):113-119.<br>
 ABSTRACT:  We observed mating by Brazilian free-tailed bats (Tadarida 
 brasiliensis) in central Texas between 21 March and 5 April 1998. We 
 documented copulations in large and small day roosts and in temporary night 
 roosts. Focal animal sampling at a highway bridge revealed an aggressive 
 and a passive male copulation strategy that may function as adaptations to 
 different roost conditions. During aggressive copulation, the male 
 separates a female from a roost cluster and restricts her movements during 
 mating while he emits characteristic calls. During passive copulation, the 
 male moves very slowly onto a female that roosts in a dense cluster. 
 Passive copulations occur without resistance from the female and without 
 male vocalizations. Both males and females mate with multiple partners, 
 suggesting that mating is promiscuous. The mating system in a large highway 
 bridge colony is characterized as mating aggregations or swarming because 
 mating occurs in large, temporally unstable multimale and multifemale 
 mating groups, with no apparent male territories or defense of 
 Brian R. Mitchell<br>
 Ph.D. Candidate<br>
 University of California, Berkeley<br>
 Department of Environmental Science, Policy and Management<br>

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