Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway

Rune Dietz; Audun Rikardsen; Martin  Biuw; Lars Kleivane; Christina Noer; Dominique Stalder; Floris van Beest; Frank Farsø Riget; Christian Sonne; Martin Hansen; Hanne Strager; Morten Tange Olsen

doi:10.1016/j.jembe.2020.151456

Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway

Rune Dietz^*, Audun Rikardsen, Martin Biuw, Lars Kleivane, Christina Noer, Dominique Stalder, Floris van Beest, Frank Farsø Riget, Christian Sonne, Martin Hansen, Hanne Strager, Morten Tange Olsen

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

15 Citations (Scopus)

Abstract

Assessing the migratory behaviour of individual and groups of animals is key to understand the function of migration, its evolution, and how it is affected by environment and human activities. In the eastern North Atlantic, killer whales (Orcinus orca) presumably track herring stocks as they migrate between across the region. However, the detailed migratory and foraging behaviour of eastern North Atlantic killer whales is poorly understood. We report on the behaviour of 15 adult male killer whales equipped with Argos satellite transmitters during the winter of 2015–2016 along the coast of Troms, northern Norway. The animals were tracked for 8–104 days (mean: 41 days), during which they migrated 302–7608 Km (mean: 2646 Km). The observed movement of killer whales south to 64.2°N along the Norwegian coast following NSS-herring to their spawning grounds is in agreement with previous studies. However, our study is the first to also document northern migration of three of the Norwegian killer whales into the Barents Sea region towards Novaya Zemlya Island about 900 km from the Norwegian coast approaching 77.0°N. Importantly, using a Bayesian state-space model, we offer new insights on killer whale searching and transit movements, as well as diurnal patterns in swimming speed, preferred foraging habitat and feeding behaviour. The 15 tagged killer whales spend 75.0% of the time in an area restricted search (ARS) mode (range: 55.2–95.2%), 3.9% of the time in a transit mode (range: 0.0–16.1%) and 21.1% (range: 4.8–36.3%) in uncertain mode. The restricted search behaviour peaked at the end of January and beginning of February, after which the killer whales gradually performing transit behaviour as they followed the migrating herring out of the region, or shifted to other prey items.

Original language	English
Article number	151456
Journal	Journal of Experimental Marine Biology and Ecology
Volume	533
Number of pages	13
ISSN	0022-0981
DOIs	https://doi.org/10.1016/j.jembe.2020.151456
Publication status	Published - Dec 2020

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Dietz, R., Rikardsen, A., Biuw, M., Kleivane, L., Noer, C., Stalder, D., van Beest, F., Riget, F. F., Sonne, C., Hansen, M., Strager, H., & Tange Olsen, M. (2020). Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway. Journal of Experimental Marine Biology and Ecology, 533, Article 151456. https://doi.org/10.1016/j.jembe.2020.151456

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title = "Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway",

abstract = "Assessing the migratory behaviour of individual and groups of animals is key to understand the function of migration, its evolution, and how it is affected by environment and human activities. In the eastern North Atlantic, killer whales (Orcinus orca) presumably track herring stocks as they migrate between across the region. However, the detailed migratory and foraging behaviour of eastern North Atlantic killer whales is poorly understood. We report on the behaviour of 15 adult male killer whales equipped with Argos satellite transmitters during the winter of 2015–2016 along the coast of Troms, northern Norway. The animals were tracked for 8–104 days (mean: 41 days), during which they migrated 302–7608 Km (mean: 2646 Km). The observed movement of killer whales south to 64.2°N along the Norwegian coast following NSS-herring to their spawning grounds is in agreement with previous studies. However, our study is the first to also document northern migration of three of the Norwegian killer whales into the Barents Sea region towards Novaya Zemlya Island about 900 km from the Norwegian coast approaching 77.0°N. Importantly, using a Bayesian state-space model, we offer new insights on killer whale searching and transit movements, as well as diurnal patterns in swimming speed, preferred foraging habitat and feeding behaviour. The 15 tagged killer whales spend 75.0% of the time in an area restricted search (ARS) mode (range: 55.2–95.2%), 3.9% of the time in a transit mode (range: 0.0–16.1%) and 21.1% (range: 4.8–36.3%) in uncertain mode. The restricted search behaviour peaked at the end of January and beginning of February, after which the killer whales gradually performing transit behaviour as they followed the migrating herring out of the region, or shifted to other prey items.",

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author = "Rune Dietz and Audun Rikardsen and Martin Biuw and Lars Kleivane and Christina Noer and Dominique Stalder and {van Beest}, Floris and Riget, {Frank Fars{\o}} and Christian Sonne and Martin Hansen and Hanne Strager and {Tange Olsen}, Morten",

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doi = "10.1016/j.jembe.2020.151456",

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Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway. / Dietz, Rune; Rikardsen, Audun; Biuw, Martin et al.
In: Journal of Experimental Marine Biology and Ecology, Vol. 533, 151456, 12.2020.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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T1 - Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway

AU - Dietz, Rune

AU - Rikardsen, Audun

AU - Biuw, Martin

AU - Kleivane, Lars

AU - Noer, Christina

AU - Stalder, Dominique

AU - van Beest, Floris

AU - Riget, Frank Farsø

AU - Sonne, Christian

AU - Hansen, Martin

AU - Strager, Hanne

AU - Tange Olsen, Morten

PY - 2020/12

Y1 - 2020/12

N2 - Assessing the migratory behaviour of individual and groups of animals is key to understand the function of migration, its evolution, and how it is affected by environment and human activities. In the eastern North Atlantic, killer whales (Orcinus orca) presumably track herring stocks as they migrate between across the region. However, the detailed migratory and foraging behaviour of eastern North Atlantic killer whales is poorly understood. We report on the behaviour of 15 adult male killer whales equipped with Argos satellite transmitters during the winter of 2015–2016 along the coast of Troms, northern Norway. The animals were tracked for 8–104 days (mean: 41 days), during which they migrated 302–7608 Km (mean: 2646 Km). The observed movement of killer whales south to 64.2°N along the Norwegian coast following NSS-herring to their spawning grounds is in agreement with previous studies. However, our study is the first to also document northern migration of three of the Norwegian killer whales into the Barents Sea region towards Novaya Zemlya Island about 900 km from the Norwegian coast approaching 77.0°N. Importantly, using a Bayesian state-space model, we offer new insights on killer whale searching and transit movements, as well as diurnal patterns in swimming speed, preferred foraging habitat and feeding behaviour. The 15 tagged killer whales spend 75.0% of the time in an area restricted search (ARS) mode (range: 55.2–95.2%), 3.9% of the time in a transit mode (range: 0.0–16.1%) and 21.1% (range: 4.8–36.3%) in uncertain mode. The restricted search behaviour peaked at the end of January and beginning of February, after which the killer whales gradually performing transit behaviour as they followed the migrating herring out of the region, or shifted to other prey items.

AB - Assessing the migratory behaviour of individual and groups of animals is key to understand the function of migration, its evolution, and how it is affected by environment and human activities. In the eastern North Atlantic, killer whales (Orcinus orca) presumably track herring stocks as they migrate between across the region. However, the detailed migratory and foraging behaviour of eastern North Atlantic killer whales is poorly understood. We report on the behaviour of 15 adult male killer whales equipped with Argos satellite transmitters during the winter of 2015–2016 along the coast of Troms, northern Norway. The animals were tracked for 8–104 days (mean: 41 days), during which they migrated 302–7608 Km (mean: 2646 Km). The observed movement of killer whales south to 64.2°N along the Norwegian coast following NSS-herring to their spawning grounds is in agreement with previous studies. However, our study is the first to also document northern migration of three of the Norwegian killer whales into the Barents Sea region towards Novaya Zemlya Island about 900 km from the Norwegian coast approaching 77.0°N. Importantly, using a Bayesian state-space model, we offer new insights on killer whale searching and transit movements, as well as diurnal patterns in swimming speed, preferred foraging habitat and feeding behaviour. The 15 tagged killer whales spend 75.0% of the time in an area restricted search (ARS) mode (range: 55.2–95.2%), 3.9% of the time in a transit mode (range: 0.0–16.1%) and 21.1% (range: 4.8–36.3%) in uncertain mode. The restricted search behaviour peaked at the end of January and beginning of February, after which the killer whales gradually performing transit behaviour as they followed the migrating herring out of the region, or shifted to other prey items.

KW - SATELLITE TRACKING

KW - state-space switching model

KW - diurnal movements

KW - long-distance movement

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DO - 10.1016/j.jembe.2020.151456

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SN - 0022-0981

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JO - Journal of Experimental Marine Biology and Ecology

JF - Journal of Experimental Marine Biology and Ecology

M1 - 151456

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Migratory and diurnal activity of North Atlantic killer whales (Orcinus orca) off northern Norway

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