Data-processing artefacts in three-dimensional dive path reconstruction from geomagnetic and acceleration data

Kozue Shiomi, Tomoko Narazaki, Katsufumi Sato, Kenichiro Shimatani, Nobuaki Arai, Paul J. Ponganis, Nobuyuki Miyazaki

研究成果: Article査読

31 被引用数 (Scopus)

抄録

Tri-axis magnetism and acceleration data loggers have recently been used to obtain time-series headings and, consequently, the 3-dimensional dive paths of aquatic animals. However, problems may arise in the resulting calculation process with multiple parameters. In this study, the dive paths of loggerhead turtles and emperor penguins were reconstructed. For both species, apparently unrealistic movements were found. Time-series heading data of turtles showed small regular fluctuations synchronous with stroking. In the dive paths of penguins, infrequent abrupt changes in heading were observed during stroke cycles. These were unlikely to represent true behaviours according to observations of underwater behaviour and tri-axis magnetism and acceleration data. Based on the relationship between sampling frequency and frequency of body posture change, we suggest that (1) the changes in the animals' posture concurrent with strokes and (2) the mismatched treatment (i.e. filtering and non-filtering) of the acceleration and magnetism data caused the artefacts. These inferences are supported by the results of simulations. For data sets obtained at a given sampling frequency, the error pattern in calculated dive paths is likely to differ depending on the frequency and amplitude of body posture changes and in swim speed. In order to avoid misinterpretation, it is necessary to understand the assumptions and inherent problems of the calculation methods as well as the behavioural characteristics of the study animals.

本文言語English
ページ(範囲)299-304
ページ数6
ジャーナルAquatic Biology
8
3
DOI
出版ステータスPublished - 2010 3 16
外部発表はい

ASJC Scopus subject areas

  • 海洋学
  • 生態、進化、行動および分類学
  • 水圏科学
  • 生態学

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