Wake respirometry allows breath-by-breath assessment of ventilation and CO2 production in unrestrained animals

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2022
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Rose, Kayleigh A. R.
Wilson, Rory P.
Ramenda, Claudia
Robotka, Hermina
Shepard, Emily L. C.
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iScience. Elsevier. 2022, 25(9), 104878. eISSN 2589-0042. Available under: doi: 10.1016/j.isci.2022.104878
Zusammenfassung

Quantifying stress and energetic responses in animals are major challenges, as existing methods lack temporal resolution and elevate animal stress. We propose "wake respirometry," a new method of quantifying fine-scale changes in CO2 production in unrestrained animals, using a nondispersive infrared CO2 sensor positioned downwind of the animal, i.e., in its wake. We parameterize the dispersion of CO2 in wakes using known CO2 flow rates and wind speeds. Tests with three bird species in a wind tunnel demonstrated that the system can resolve breath-by-breath changes in CO2 concentration, with clear exhalation signatures increasing in period and integral with body size. Changes in physiological state were detectable following handling, flight, and exposure to a perceived threat. We discuss the potential of wake respirometry to quantify stress and respiratory patterns in wild animals and provide suggestions for estimating behavior-specific metabolic rates via full integration of CO2 production across the wake.

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570 Biowissenschaften, Biologie
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Wildlife behavior, Physiology, Animal physiology, Methodology in biological sciences
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ISO 690ROSE, Kayleigh A. R., Rory P. WILSON, Claudia RAMENDA, Hermina ROBOTKA, Martin WIKELSKI, Emily L. C. SHEPARD, 2022. Wake respirometry allows breath-by-breath assessment of ventilation and CO2 production in unrestrained animals. In: iScience. Elsevier. 2022, 25(9), 104878. eISSN 2589-0042. Available under: doi: 10.1016/j.isci.2022.104878
BibTex
@article{Rose2022-09-16respi-59076,
  year={2022},
  doi={10.1016/j.isci.2022.104878},
  title={Wake respirometry allows breath-by-breath assessment of ventilation and CO<sub>2</sub> production in unrestrained animals},
  number={9},
  volume={25},
  journal={iScience},
  author={Rose, Kayleigh A. R. and Wilson, Rory P. and Ramenda, Claudia and Robotka, Hermina and Wikelski, Martin and Shepard, Emily L. C.},
  note={Article Number: 104878}
}
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    <dcterms:abstract xml:lang="eng">Quantifying stress and energetic responses in animals are major challenges, as existing methods lack temporal resolution and elevate animal stress. We propose "wake respirometry," a new method of quantifying fine-scale changes in CO&lt;sub&gt;2&lt;/sub&gt; production in unrestrained animals, using a nondispersive infrared CO&lt;sub&gt;2&lt;/sub&gt; sensor positioned downwind of the animal, i.e., in its wake. We parameterize the dispersion of CO&lt;sub&gt;2&lt;/sub&gt; in wakes using known CO&lt;sub&gt;2&lt;/sub&gt; flow rates and wind speeds. Tests with three bird species in a wind tunnel demonstrated that the system can resolve breath-by-breath changes in CO&lt;sub&gt;2&lt;/sub&gt; concentration, with clear exhalation signatures increasing in period and integral with body size. Changes in physiological state were detectable following handling, flight, and exposure to a perceived threat. We discuss the potential of wake respirometry to quantify stress and respiratory patterns in wild animals and provide suggestions for estimating behavior-specific metabolic rates via full integration of CO&lt;sub&gt;2&lt;/sub&gt; production across the wake.</dcterms:abstract>
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