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Heterothermic Migration Strategies in Flying Vertebrates.

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Heterothermy, a state of altered body temperature, helps migrating bats and birds reduce energy costs during migration. This strategy, including torpor in bats, may be more common in birds than previously thought.

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Area of Science:

  • Zoology
  • Ecology
  • Physiology

Background:

  • Migration is a complex animal behavior influenced by individual physiology and energetics.
  • Stopover periods during migration present challenges, especially thermoregulation for endotherms.
  • Heterothermy is a key strategy to manage thermoregulatory costs in migrating animals.

Approach:

  • This review synthesizes empirical evidence and theoretical models on heterothermy in migrating bats and birds.
  • It examines the use of torpor and shallow heterothermy during migratory stopovers.
  • The review also considers evolutionary implications of heterothermy.

Key Points:

  • Torpor-assisted migration in bats reduces thermoregulatory costs, shortens stopovers, and lowers fuel needs.
  • While most birds cannot enter deep torpor, many utilize shallower heterothermic strategies during migration.
  • Evidence suggests heterothermic migration is more prevalent in birds than traditionally recognized.

Conclusions:

  • Heterothermy is a crucial adaptation for migrating bats and birds, impacting energetics, movement, and survival.
  • Further research is needed to fully understand the broad implications of heterothermic migration.
  • Heterothermy may also represent an alternative to migration or a strategy to cope with seasonal resource scarcity.