Behavioral Ecology and Sociobiology

, Volume 65, Issue 7, pp 1377–1387 | Cite as

Whistle communication in mammal-eating killer whales (Orcinus orca): further evidence for acoustic divergence between ecotypes

Original Paper

Abstract

Public signaling plays an important role in territorial and sexual displays in animals; however, in certain situations, it is advantageous to keep signaling private to prevent eavesdropping by unintended receivers. In the northeastern Pacific, two populations of killer whales (Orcinus orca), fish-eating “resident” killer whales and mammal-eating “transient” killer whales, share the same habitat. Previous studies have shown that residents use whistles as private signals during close-range communication, where they probably serve to coordinate behavioral interactions. Here, we investigated the whistling behavior of mammal-eating killer whales, and, based on divergent social structures and social behaviors between residents and transients, we predicted to find differences in both whistle usage and whistle parameters. Our results show that, like resident killer whales, transients produce both variable and stereotyped whistles. However, clear differences in whistle parameters between ecotypes show that the whistle repertoire of mammal-eating killer whales is clearly distinct from and less complex than that of fish-eating killer whales. Furthermore, mammal-eating killer whales only produce whistles during “milling after kill” and “surface-active” behaviors, but are almost completely silent during all other activities. Nonetheless, whistles of transient killer whales may still serve a role similar to that of resident killer whales. Mammal-eating killer whales seem to be under strong selection to keep their communication private from potential prey (whose hearing ranges overlap with that of killer whales), and they appear to accomplish this mainly by restricting vocal activity rather than by changes in whistle parameters.

Keywords

Acoustic crypsis Communication networks Eavesdropping Feeding ecology Predation Private signals Public signals Social networks 

Supplementary material

265_2011_1148_MOESM1_ESM.doc (188 kb)
ESM 1(DOC 187 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of OklahomaNormanUSA
  2. 2.Department of Biology & W. M. Keck Center for Behavioral BiologyNorth Carolina State UniversityRaleighUSA
  3. 3.Sea Mammal Research Unit, Scottish Oceans InstituteUniversity of St. AndrewsFifeUK
  4. 4.Cetacean Research LaboratoryVancouver AquariumVancouverCanada

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