Variability in the echolocation of Tadarida brasiliensis: effects of geography and local acoustic environment

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Eavesdropping by bats on the feeding buzzes of conspecifics (2007, background): “brasiliensis are generally narrowband and relatively low in frequency (mean minimum frequency of 22.3 kHz; Gillam and McCracken 2007); as a result, calls will propagate substantial distances in the environment and be audible to nearby bats.”
A dual function of echolocation: Bats use echolocation calls to identify familiar and unfamiliar individuals (2010, unknown): “Several studies have shown that bats adjust frequency and pressure levels of their echolocation calls according to the presence of conspecifics (e.g. Obrist 1995; Ratcliffe et al. 2004), noisy environments (Schaub et al. 2008) or habitat types (e.g. Obrist 1995; Gillam & McCracken 2007).”
A Comparison of Bottlenose Dolphin Whistles in the Atlantic Ocean: Factors Promoting Whistle Variation (2008, background): “…et al. 2000; Mundinger 1982), isolation and genetic divergence between groups or populations (e.g., Ford 2002; Lemon 1966; McGregor et al. 2000), and adaptation to ecological conditions (e.g., Boncoraglio and Saino 2007; Brumm 2006; Gillam and McCracken 2007; Marler 1960; Peters et al. 2007).”