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- Title
Two-component calls in short-finned pilot whales ( Globicephala macrorhynchus).
- Authors
Quick, Nicola; Callahan, Holly; Read, Andrew J.
- Abstract
Short-finned pilot whales ( Globicephala macrorhynchus) have complex vocal repertoires that include calls with two time-frequency contours known as two-component calls. We attached digital acoustic recording tags ( DTAGs) to 23 short-finned pilot whales off Cape Hatteras, North Carolina, and assessed the similarity of two-component calls within and among tags. Two-component calls made up <3% of the total number of calls on 19 of the 23 tag records. For the remaining four tags, two-component calls comprised 9%, 23%, 24%, and 57% of the total calls recorded. Measurements of six acoustic parameters for both the low and high frequency components of all two-component calls from the five tags were compared using a generalized linear model. There were significant differences in the acoustic parameters of two-component calls between tags, verifying that acoustic parameters were more similar for two-component calls recorded on the same tag than for calls between tags. Spectrograms of all two-component calls from the five tags were visually graded and independently categorized by five observers. A test of inter-rater reliability showed substantial agreement, suggesting that each tag contained a predominant two-component call type that was not shared across tags.
- Subjects
HATTERAS, Cape (N.C.); GLOBICEPHALA macrorhynchus; SOUND production by mammals; TIME-frequency analysis; MAMMAL communication; SPECTROGRAMS
- Publication
Marine Mammal Science, 2018, Vol 34, Issue 1, p155
- ISSN
0824-0469
- Publication type
Article
- DOI
10.1111/mms.12452