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Questions and Answers
What is the primary characteristic of hibernation?
What is the primary characteristic of hibernation?
- Increased activity and metabolic rate
- Consistent body temperature throughout the year
- Minimal activity and metabolic depression (correct)
- Increased food consumption
What is the difference between obligate and facultative hibernation?
What is the difference between obligate and facultative hibernation?
- Obligate hibernators have a longer hibernation period, while facultative hibernators have a shorter hibernation period.
- Obligate hibernators are found in tropical regions, while facultative hibernators are found in temperate regions.
- Obligate hibernators have a higher metabolic rate, while facultative hibernators have a lower metabolic rate.
- Obligate hibernators enter hibernation spontaneously and annually, while facultative hibernators only enter hibernation when stressed or food-deprived. (correct)
How do hibernating animals avoid muscle atrophy and dehydration?
How do hibernating animals avoid muscle atrophy and dehydration?
- They recycle their proteins and urine, and metabolize fat to stay hydrated. (correct)
- They rely on their stored energy reserves and do not need to consume any food or water during hibernation.
- They enter a state of complete inactivity, which prevents muscle atrophy and dehydration.
- They increase their food intake and water consumption during hibernation.
Why was the discovery of hibernation in the fat-tailed dwarf lemur of Madagascar significant?
Why was the discovery of hibernation in the fat-tailed dwarf lemur of Madagascar significant?
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What is the primary reason why hibernating animals do not eat or drink while hibernating?
What is the primary reason why hibernating animals do not eat or drink while hibernating?
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What is the significance of Malagasy winter temperatures sometimes rising above 30°C (86°F) for the hibernation of the fat-tailed dwarf lemur?
What is the significance of Malagasy winter temperatures sometimes rising above 30°C (86°F) for the hibernation of the fat-tailed dwarf lemur?
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Study Notes
Hibernation Characteristics
- Hibernation is a state of minimal activity and metabolic depression
- Characterized by low body temperature, slow breathing, and heart rate, and low metabolic rate
Types of Hibernation
- Obligate hibernation: occurs spontaneously and annually, regardless of ambient temperature and access to food
- Facultative hibernation: occurs only when cold-stressed, food-deprived, or both
Hibernation in Primates
- Until recently, no primate or tropical mammal was known to hibernate
- Fat-tailed dwarf lemur of Madagascar hibernates in tree holes for seven months of the year
- Hibernation not exclusively an adaptation to low ambient temperatures, as Malagasy winter temperatures can rise to over 30 °C (86 °F)
Hibernation Adaptations
- Recycling of proteins and urine allows hibernators to stop urinating for months and avoid muscle atrophy
- Metabolic fat produced in sufficient quantities to satisfy water needs
- Hibernators do not eat or drink while hibernating, but live off stored fat
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