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Vocal repertoire and calling activity of the mink frog, Rana septentrionalis

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We studied the calling behavior of male mink frogs, Rana septentrionalis, and how their calling activity varied through nightly calling periods. We observed focal males during their summer breeding season for 1 h periods during chorus activity, which extends from midnight until 0900h, and recorded call types and rates. During this period, male R. septentrionalis produced a repertoire of single and multi-note calls composed of one or two note types, referred to as cuk and rumble notes. Calls that included series of both note types were most frequent between 0100 and 0330h, while single cuks were primarily produced early and late in the chorus period. Call rate peaked between 0200h and 0300h, declined until dawn, then increased until 0900h. Call properties were analyzed from recordings of male vocalizations; temporal properties, such as call and note duration, were the most variable, both within and among males, whereas spectral properties, such as dominant frequency, varied the least. In general, males produced the most complex and variable calls during a peak period of calling activity.


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