Related Experiment Videos
Panting in reindeer (Rangifer tarandus).
O Aas-Hansen1, L P Folkow, A S Blix
1Department of Arctic Biology and Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway.
Summary
Norwegian reindeer use open-mouth panting to cool down, but this method significantly reduces the potential for selective brain cooling. This impacts their ability to regulate brain temperature in hot conditions.
Area of Science:
- Animal Physiology
- Thermoregulation
- Mammalian Biology
Background:
- Reindeer (Rangifer tarandus tarandus) are adapted to cold environments.
- Understanding thermoregulation in reindeer is crucial for predicting their response to climate change.
- Selective brain cooling is a key mechanism for mammals to protect the brain from overheating.
Purpose of the Study:
- To investigate the respiratory patterns of reindeer during heat exposure.
- To determine the airflow dynamics through the nose and mouth during panting.
- To assess the impact of panting on selective brain cooling in reindeer.
Main Methods:
- Two winter-acclimatized reindeer were exposed to varying temperatures (10-38°C) in a climatic chamber.
- Respiratory airflow (nasal and oral minute volumes) and direction were measured during closed- and open-mouth panting.
- Changes in respiratory frequency and minute volume were recorded in response to heat load.
Main Results:
- Reindeer increased open-mouth panting with rising ambient temperatures.
- Open-mouth panting involved bidirectional airflow through both nose and mouth.
- Only a small fraction (2.4%) of airflow was directed through the nasal passages during open-mouth panting.
Conclusions:
- The airflow pattern during open-mouth panting in reindeer limits the effectiveness of selective brain cooling.
- Reindeer may have reduced capacity to protect their brain from heat stress compared to other mammals.
- Further research is needed to understand the long-term implications for reindeer populations facing warming climates.