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Montana Bat Call Overview

Montana Bat Call Overview. FM sweep a smooth curve Often a well-defined downward tail Sometimes a lower inflection, or “ledge” before f c Peak power persists for at least 1 ms f c > 48 diagnostic when compared to MYCI. Pronounced knee

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Montana Bat Call Overview

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  1. Montana Bat Call Overview • FM sweep a smooth curve • Often a well-defined downward tail • Sometimes a lower inflection, or “ledge” before fc • Peak power persists for at least 1 ms • fc > 48 diagnostic when compared to MYCI • Pronounced knee • fc > 44 kHz, duration > 6 ms, upper slope < 16, and lower slope < 3 within known range • Power focused around fc; gradually builds to a peak and attenuates rapidly • Sometimes insert longer duration calls within a sequence of short duration calls Antrozous pallidus Lasiurus cinereus Myotis volans • FM sweep a smooth curve • Well defined downward tail • fc < 45 kHz when in MYCA geographical range • Peak power of call persists for at least 1 ms Eptesicus fuscus • May exhibit upward sweep into the call Corynorhinus townsendii Myotis lucifugus Lasiurus borealis Myotis yumanensis Myotis californicus Lasionycteris noctivagans • “U” shaped calls; upturn at end • fc variable within a sequence • power centered smoothly in center • duration >10 ms diagnostic among 40 kHz bats • Duration > 7 ms • Lower slope < 3 • fc < 44 diagnostic west of Continental Divide • Calls with high f above 65 kHz are distinguished from LANO • Calls with harmonics, < 7 ms AND > 65 kHz • Calls with duration > 12 ms and/or > 6 calls/second distinguish from ANPA where species coexist • Distinguish from EPFU when < 6 calls/second for > 1 second • Presence of social calls Euderma maculatum Myotis ciliolabrum • Flat calls with fc > 26 kHz • Calls < 7 ms with harmonics AND < 55 kHz • Simple linear FM sweep (sometimes with upsweep or plateau at onset but no knee or curvature toward the end of call) • Squiggle call with 5 ms intervals Myotis thysanodes • Continuous steep shape, especially with harmonics • fc < 28 kHz (and usually into the 20s) and total slope >15 • fc < 28 kHz and total slope >10 diagnostic if converging harmonics are present • fc </= 24 kHz • pronounced or subtle “U” shape • low f may vary across a sequence • power builds toward center then gradually declines Myotis evotis • Converging harmonics • fc: 32-36 kHz • simple linear FM sweep • duration: 3-8 ms • fc: 7-10 kHz

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