Robert-Coudert, Yvonne and Wilson, Rory P. (2004) Subjectivity in bio-logging: do logged data mislead?. Memoirs of the National Institute of Polar Research: Special Issue, 58 . pp. 23-33.

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Abstract

Logging of data using animal-attached archival units (bio-logging) involves potential sources of subjectivity that are reviewed in the present paper. Subjectivity may be the result of technical limitations of which the selection of the correct sampling frequency is particularly critical. Mistakes or aberrant data can also result from transitory defaults in the loggers functioning. Similarly, the use of purpose-written software to pre-process logged data before analysis is another step during which substantial modification of the raw data can
occur. Apart from technical limitations, bio-logging devices are also known to modify the
behaviour of the animal studied. Finally, arbitrary conclusions can eventually be drawn out from the ‘visual’ analysis of logged-data. The second part of this review proposes a nonexhaustive list of precautions so as to enhance objectivity in bio-logging approach. Among these precautions, assessment of the impact that data-logger may have on the animal, appropriate calibrations (for example for transformation of the raw measurements into useable variables) and multi-data sampling are useful steps in bio-logging utilization.

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