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Prey switching by killer whales in the north-east Atlantic: observational evidence and experimental insights

Published online by Cambridge University Press:  17 December 2013

Dag Vongraven  and
Anna Bisther
Dag Vongraven*
Affiliation:
Norwegian Polar Institute, Fram Center, N-9296 Tromsø, Norway
Anna Bisther
Affiliation:
Reportagebörsen, Kronhusgatan 2F, S-41113 Gothenburg, Sweden
*
Correspondence should be addressed to: D. Vongraven, Norwegian Polar Institute, Fram Center, N-9296 Tromsø, Norway email: vongraven@npolar.no
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Abstract

Studies in the Pacific have identified distinct killer whale ecotypes that are either specialized mammal- or fish-eaters. The different types have developed hunting strategies that would suggest specialization could be more advantageous than generalism. However, it has been suggested, based on long-term dietary markers of tooth wear and stable isotope values, that lineages in the North Atlantic are generalist, but with individual variation in the proportion of prey types consumed. Here, we present the results of ten years of observational and photo-identification data of a population of killer whales that follows the Norwegian spring-spawning stock of Atlantic herring. Although the whales were predominantly observed while feeding upon herring, one pod of herring-eating whales was also observed interacting with seals. This supports the hypothesis based on the long-term markers, of a degree of specialization, with a small number of groups persistently feeding upon mammals, but switching between herring and seals. We further investigated this prey switching by conducting playbacks of herring-eating killer whale sounds to harbour seals at haul-out sites on the herring spawning grounds. We recorded changes in behaviour consistent with an anti-predator response, suggesting the seals perceived the herring-eating killer whales as a potential predatory threat and had not habituated to their calls. This could be due to the risk of herring-eating killer whales switching to mammalian prey, or the difficulty of discriminating between killer whale pods due to the large population size and number of killer whale call dialects in this population, or a combination of both.

Keywords

killer whalepredator–preyfeeding ecologyphoto identificationplayback
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 6 , September 2014 , pp. 1357 - 1365
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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References

REFERENCES

Abrams, P.A. (2006) The effects of switching behaviour on the evolutionary diversification of generalist consumers. American Naturalist 168, 645–659.CrossRefGoogle ScholarPubMed
Baird, R.W. and Dill, L.M. (1996) Ecological and social determinants of group size in transient killer whales. Behavioral Ecology 7, 408–416.CrossRefGoogle Scholar
Baird, R.W. and Whitehead, H. (2000) Social organization of mammal-eating killer whales: group stability and dispersal patterns. Canadian Journal of Zoology 78, 2096–2105.CrossRefGoogle Scholar
Baird, R.W., Abrams, P.A. and Dill, L.M. (1992) Possible indirect interactions between transient and resident killer whales: implications for the evolution of foraging specializations in the genus Orcinus. Oecologia 89, 125–132.CrossRefGoogle ScholarPubMed
Barrett-Lennard, L.G., Ford, J.K.B. and Heise, K.A. (1996) The mixed blessing of echolocation: differences in sonar use by fish-eating and mammal-eating killer whales. Animal Behaviour 51, 553–565.CrossRefGoogle Scholar
Beck, S., Kuningas, S., Esteban-Pavo, R. and Foote, A.D. (2012) The influence of sociality on ecology in the killer whale (Orcinus orca). Behavioral Ecology 23, 246–253.CrossRefGoogle Scholar
Bigg, M.A. (1982) An assessment of killer whale (Orcinus orca) stocks off Vancouver Island, British Columbia. Report of the International Whaling Commission 32, 655–666.Google Scholar
Bigg, M.A., Olesiuk, P.F., Ellis, G.M., Ford, J.K.B. and Balcomb, K.C. (1990) Social organization and geneaology of resident killer whales Orcinus orca in the coastal waters of British Columbia and Washington State. In Hammond, P.S., Mizroch, S.A. and Donovan, G.P. (eds) Individual recognition of cetaceans: use of photo-identification and other techniques to estimate population parameters. Report of the International Whaling Commission, Special Issue 12. Cambridge: The International Whaling Commission, pp. 383–405.Google Scholar
Bisther, A. (1991) The acoustic communication of social groups of photographically identified killer whales (Orcinus orca) at the coast off Norway. Undergraduate thesis, Göteborg University, Sweden.Google Scholar
Bisther, A. and Vongraven, D. (1994) Killer whales off the mid-Norwegian coast. Final report, project 4001-319.016, Bergen: Norwegian Fisheries Research Council.Google Scholar
Bisther, A. and Vongraven, D. (1995) Studies of the social ecology of Norwegian killer whales (Orcinus orca). In Blix, A.S. and Walløe, L. (eds) Whales, seals, fish and man. Amsterdam: Elsevier, pp. 169–176.Google Scholar
Bisther, A. and Vongraven, D. (2001) Killer whales feeding on both mammals and fish: a transient, resident or opportunistic type? In Proceedings of the Fourteenth Biennial Conference on the Biology of Marine Mammals, 28 November–3 December 2001, Vancouver, Canada.Google Scholar
Bjørge, A., Thompson, D., Hammond, P., Fedak, M., Bryant, E., Aarefjord, H., Roen, R. and Olsen, M. (1995) Habitat use and diving behaviour of harbour seals in a coastal archipelago in Norway. In Blix, A.S. and Walløe, L. (eds) Whales, seals, fish and man. Amsterdam: Elsevier, pp. 211–223.Google Scholar
Bolt, H.E., Harvey, P.V., Mandleberg, L. and Foote, A.D. (2009) Occurrence of killer whales in Scottish inshore waters: temporal and spatial patterns relative to the distribution of declining harbour seal populations. Aquatic Conservation: Marine and Freshwater Ecosystems 19, 671–675.CrossRefGoogle Scholar
Dahlheim, M.E. and White, P.A. (2010) Ecological aspects of transient killer whales Orcinus orca as predators in southeastern Alaska, Wildlife Behavior 16, 308–322.CrossRefGoogle Scholar
Deecke, V.B., Ford, J.K.B. and Slater, P.J.B. (2005) The vocal behaviour of mammal-eating killer whales: communicating with costly calls. Animal Behaviour 69, 395–405.CrossRefGoogle Scholar
Deecke, V.B., Slater, P.J.B. and Ford, J.K.B. (2002) Selective habituation shapes acoustic predator recognition in harbour seals. Nature 420, 171–173.CrossRefGoogle ScholarPubMed
Deecke, V.B., Nykänen, M., Foote, A.D. and Janik, V.M. (2011) Vocal behaviour and feeding ecology of killer whales Orcinus orca around Shetland, UK. Aquatic Biology 13, 79–88.CrossRefGoogle Scholar
Doksæter, L., Godø, O.R., Handegard, N.O., Kvadsheim, P.H., Lam, F.-P.A., Donovan, C. and Miller, P.J.O. (2009) Behavioral responses of herring (Clupea harengus) to 1–2 and 6–7 kHz sonar signals and killer whale feeding sounds. Journal of the Acoustical Society of America 125, 554–564.CrossRefGoogle ScholarPubMed
Foote, A.D. and Nystuen, J.A. (2008) Variation in call pitch among killer whale ecotypes. Journal of the Acoustical Society of America 123, 1747–1752.CrossRefGoogle ScholarPubMed
Foote, A.D., Osborne, R.W. and Hoelzel, A.R. (2008) Temporal and contextual patterns of killer whale (Orcinus orca) call type production. Ethology 114, 599–606.CrossRefGoogle Scholar
Foote, A.D., Newton, J., Piertney, S.B., Willerslev, E. and Gilbert, M.T.P. (2009) Ecological, morphological and genetic divergence of sympatric North Atlantic killer whale populations. Molecular Ecology 18, 5207–5217.CrossRefGoogle ScholarPubMed
Foote, A.D., Similä, T., Vikingsson, G.A. and Stevick, P.T. (2010) Movement, site fidelity and connectivity in a top marine predator, the killer whale. Evolutionary Ecology 24, 803–814.CrossRefGoogle Scholar
Ford, J.K.B. (1991) Vocal traditions among resident killer whales (Orcinus orca) in coastal waters of British Columbia. Canadian Journal of Zoology 69, 1454–1483.CrossRefGoogle Scholar
Ford, J.K.B. and Fisher, H.D. (1983) Group specific dialects of killer whales Orcinus orca in British Columbia. In Payne, R. (ed.) Communication and behavior of whales. Boulder, CO: Westview Press, pp. 129–161.Google Scholar
Ford, J.K.B., Ellis, G.M. and Balcomb, K.C. (2000) Killer whales; the natural history and genealogy of Orcinus orca in British Columbia and Washington. Vancouver: UBC Press.Google Scholar
Frid, A., Dill, L.M., Thorne, R.E. and Blundell, G.M. (2007) Inferring prey perception of relative danger in large-scale marine systems. Evolutionary Ecology Research 9, 635–649.Google Scholar
Kuningas, S., Similä, T. and Hammond, P.S. (2007) Population dynamics of killer whales (Orcinus orca) off Northern Norway. Cambridge: International Whaling Commission, Scientific Committee Report SC/59/SM13.Google Scholar
Kuningas, S., Similä, T. and Hammond, P.S.Population size, survival and reproductive rates of northern Norwegian killer whales (Orcinus orca) in 1986–2003. Journal of the Marine Biological Association of the United Kingdom, in press.Google Scholar
Lyrholm, T. (1988) Photoidentification of individual killer whales, Orcinus orca, off the coast of Norway, 1983–1986. Rit Fiskideildar 11, 89–94.Google Scholar
McComb, K., Shannon, G., Durant, S.M., Sayialel, K., Slotow, R., Poole, J. and Moss, C. (2011) Leadership in elephants: the adaptive value of age. Proceedings of the Royal Society B 278, 3270–3276.CrossRefGoogle ScholarPubMed
Miller, P.J.O. (2006) Diversity in sound pressure levels and estimated active space of resident killer whale vocalizations. Journal of Comparative Physiology A 192, 449–459.CrossRefGoogle ScholarPubMed
Morton, A.B. (1990) A quantitative comparison of the behaviour of resident and transient forms of the killer whale off the central British Columbia coast. In Hammond, P.S., Mizroch, S.A. and Donovan, G.P. (eds) Individual recognition of cetaceans: use of photo-identification and other techniques to estimate population parameters. Report of the International Whaling Commission Special Issue 12. Cambridge: The International Whaling Commission, pp. 245–248.Google Scholar
Saulitis, E.L., Matkin, C.O. and Fay, F.H. (2005) Vocal repertoire and acoustic behaviour of the isolated AT1 killer whale subpopulation in southern Alaska. Canadian Journal of Zoology 83, 1015–1029.CrossRefGoogle Scholar
Similä, T. (1997a) Sonar observations of killer whales (Orcinus orca) feeding on herring schools. Aquatic Mammals 23, 119–126.Google Scholar
Similä, T. (1997b) Behavioral ecology of killer whales in northern Norway. DSc thesis, Norwegian College of Fisheries Science, University of Tromsø, Norway.Google Scholar
Similä, T. and Ugarte, F. (1993) Surface and under-water observations of cooperatively feeding killer whales in northern Norway. Canadian Journal of Zoology 71, 1494–1499.CrossRefGoogle Scholar
Similä, T., Holst, J.C. and Christensen, I. (1996) Occurrence and diet of killer whales in northern Norway: seasonal patterns relative to the distribution and abundance of Norwegian spring-spawning herring. Canadian Journal of Fisheries and Aquatic Sciences 53, 769–779.CrossRefGoogle Scholar
Simon, M., McGregor, P.K. and Ugarte, F. (2007) The relationship between the acoustic behaviour and surface activity of killer whales (Orcinus orca) that feed on herring (Clupea harengus). Acta Ethologica 10, 47–53.CrossRefGoogle Scholar
Strager, H. (1995) Pod-specific call repertoires and compound calls of killer whales, Orcinus orca, in the waters of northern Norway. Canadian Journal of Zoology 73, 1037–1047.CrossRefGoogle Scholar
Thompson, D., Sjoberg, M., Bryant, E.B., Lovell, P. and Bjorge, A. (1998) Behavioural and physiological responses of harbour (Phoca vitulina) and grey (Halichoerus grypus) seals to seismic surveys. European Research on Cetaceans 12, 274.Google Scholar
Wirsing, A.J., Heithaus, M.R. and Dill, L.M. (2007) Living on the edge: dugongs prefer to forage in microhabitats that allow escape from rather than avoidance of predators. Animal Behaviour 74, 93–101.CrossRefGoogle Scholar
Womble, J.N., Gende, S.M. and Blundell, G.M. (2007) Dive behaviour of a harbour seal (Phoca vitulina richardii) in the presence of transient killer whales (Orcinus orca) in Glacier Bay National Park, Alaska. Marine Mammal Science 23, 203–208.CrossRefGoogle Scholar