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Related Concept Videos

Instrument Calibration01:12

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Related Experiment Video

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Measuring Light-Switching Behavior Using an Occupancy and Light Data Logger
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Calibrating animal-borne proximity loggers.

Christian Rutz1, Michael B Morrissey2, Zackory T Burns3

  • 1Department of Zoology University of Oxford South Parks Road Oxford OX1 3PS UK; Present address: School of Biology Centre for Biological Diversity University of St Andrews Sir Harold Mitchell Building St Andrews KY16 9TH UK.

Methods in Ecology and Evolution
|August 23, 2016
PubMed
Summary

This study calibrated proximity loggers for tracking New Caledonian crow social networks. The system reliably estimates crow proximity, enabling detailed analysis of animal social dynamics in the wild.

Keywords:
Corvus moneduloidesEncounternetanimal social networkbiologgingbusiness card tagcontact networkdirect and indirect encounter mappingreality miningtransceiver tagwireless sensor network

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Area of Science:

  • Animal Behavior
  • Ecology
  • Bio-logging Technology

Background:

  • Growing interest in animal social networks necessitates reliable automated tracking.
  • Animal-attached proximity loggers record spatial associations via radio communication.
  • Field calibration of proximity loggers is challenging due to heterogeneous environments.

Purpose of the Study:

  • To calibrate the 'Encounternet' digital proximity-logging system for wild New Caledonian crows (Corvus moneduloides).
  • To develop a quantitative model for estimating crow-to-crow distances from logger signal strength.
  • To enable robust post hoc analysis of social dynamics using proximity data.

Main Methods:

  • Combined theoretical analyses, field experiments, statistical modeling, behavioral observations, and computer simulations.
  • Focused on radio communication between crow-borne loggers.
  • Developed a multi-step calibration exercise for accurate distance estimation.

Main Results:

  • Signal strength data reliably assigned crow encounters to predefined distance classes.
  • Enabled filtering of raw data to focus on close-range encounters (within meters).
  • Demonstrated the system's potential for analyzing social learning through direct observation.

Conclusions:

  • Well-calibrated proximity loggers can map social associations of free-ranging animals across meaningful distances.
  • Study-specific calibrations are crucial to account for environmental and technological complexities.
  • The calibration methodology is applicable to diverse tracking systems and study species.