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Strange attractor of a narwhal (Monodon monoceros)

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Title: Strange attractor of a narwhal (Monodon monoceros)
Authors: Podolskiy, Evgeny A. Browse this author
Heide-Jorgensen, Mads Peter Browse this author
Issue Date: 22-Sep-2022
Publisher: PLOS
Journal Title: PLoS computational biology
Volume: 18
Issue: 9
Start Page: e1010432
Publisher DOI: 10.1371/journal.pcbi.1010432
Abstract: Detecting structures within the continuous diving behavior of marine animals is challenging, and no universal framework is available. We captured such diverse structures using chaos theory. By applying time-delay embedding to exceptionally long dive records (83 d) from the narwhal, we reconstructed the state-space portrait. Using measures of chaos, we detected a diurnal pattern and its seasonal modulation, classified data, and found how sea-ice appearance shifts time budgets. There is more near-surface rest but deeper dives at solar noon, and more intense diving during twilight and at night but to shallower depths (likely following squid); sea-ice appearance reduces rest. The introduced geometrical approach is simple to implement and potentially helpful for mapping and labeling long-term behavioral data, identifying differences between individual animals and species, and detecting perturbations.
Type: article
Appears in Collections:北極域研究センター (Arctic Research Center) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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