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Ontogeny of thermoregulatory mechanisms in king penguin chicks (Aptenodytes patagonicus)

Claude Duchamp1, Jean Louis Rouanet, Hervé Barré

  • 1Laboratoire de Physiologie des Régulations Energétiques, Cellulaires et Moléculaires, Centre National de la Recherche Scientifique-Université Claude Bernard Lyon I, Villeurbanne, France. claude.duchamp@univ-lyon1.fr

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
|March 19, 2002
PubMed

Insights

King penguin chicks develop thermoregulation through improved insulation and metabolic heat production. These adaptations are crucial for chick survival and growth in harsh climates.

Area of Science:

  • Animal Physiology
  • Avian Biology
  • Ecology

Background:

  • Thermoregulation is vital for chick survival, growth, and parental energy conservation, especially in challenging climates.
  • King penguin chicks hatch with limited thermoregulatory abilities, facing hypothermia shortly after birth.
  • Understanding the ontogeny of thermoregulation is key to comprehending early-life survival strategies in polar birds.

Purpose of the Study:

  • To investigate the developmental changes in thermoregulatory mechanisms in king penguin chicks from hatching to one month of age.
  • To determine the relative contributions of metabolic heat production and thermal insulation to thermal emancipation.
  • To identify the key adaptations enabling king penguin chicks to achieve thermal independence.

Main Methods:

  • Studied king penguin chicks in the sub-Antarctic (Crozet Archipelago) from hatching to one month.
  • Assessed thermogenesis using indirect calorimetry and shivering using electromyography.
  • Measured changes in metabolic rate, thermogenic capacity, and thermal insulation (thermal conductance).

Main Results:

  • Newly hatched chicks exhibited limited thermogenesis and became hypothermic, but metabolic rates increased rapidly within days.
  • Thermogenic capacity in the cold doubled in the first week, while thermal insulation remained unchanged.
  • Thermal insulation significantly improved during weeks two and three due to down growth, while resting metabolic rate slightly decreased.
  • Shivering was present from hatching, with its efficiency increasing five-fold, but no non-shivering thermogenesis was observed.

Conclusions:

  • Thermal emancipation in king penguin chicks is primarily driven by enhanced thermal insulation following the maturation of thermogenic processes.
  • Both metabolic and insulative adaptations are essential for the rapid development of thermoregulation and thermal independence in young king penguins.
  • This study highlights the critical interplay between metabolic heat production and insulation in ensuring chick survival during early development.

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