Table 2 Call detection rates for three killer whale populations. First quartile, median, and third quartile of discrete call detection rate (calls detected/whale/min) with number of recordings (n), and quartile coefficient of dispersion for southern Alaska resident, Gulf of Alaska transient, and AT1 transient killer whales. Gulf of Alaska transient call detection rates were significantly higher in Montague Strait than other locations, so values are reported overall and by location. Time was measured two ways: (1) calling period, i.e., the end of the last call minus the beginning of the first call within a recording, and (2) recording length.
From: Killer whale call detection rates vary among subspecies and populations in the North Pacific
Population | Number of recordings | Measure of time | First quartile | Median call detection rate | Third quartile | Quartile coefficient of dispersion |
|---|---|---|---|---|---|---|
Southern Alaska residents | 527 | Calling period | 0.41 | 0.64 | 0.94 | 0.39 |
Recording length | 0.20 | 0.42 | 0.69 | 0.55 | ||
Gulf of Alaska transients (all locations) | 247 | Calling period | 1.01 | 1.54 | 2.27 | 0.38 |
Recording length | 0.52 | 0.92 | 1.50 | 0.49 | ||
Gulf of Alaska transients (Montague Strait) | 75 | Calling period | 1.33 | 1.95 | 2.33 | 0.27 |
Recording length | 0.69 | 1.21 | 1.93 | 0.47 | ||
Gulf of Alaska transients (Hinchinbrook Entrance and Kachemak Bay) | 172 | Calling period | 0.85 | 1.43 | 2.09 | 0.42 |
Recording length | 0.46 | 0.84 | 1.44 | 0.52 | ||
AT1 transients | 69 | Calling period | 1.58 | 2.33 | 3.02 | 0.31 |
Recording length | 0.21 | 0.34 | 0.48 | 0.40 |
