The ‘pace of life’: are there links between life history and energy metabolism in birds?
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2015-08-20
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Universidad ICESI. Facultad de Ciencias Naturales
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Tropical and temperate-breeding birds differ in many ways, but in terms of life history the most striking difference is in the ‘pace of life’: tropical birds live at a slower pace, with smaller clutches, prolonged nestling periods, delayed reproduction, and long life spans compared to temperate birds. Additionally, most tropical birds are relatively sedentary, while many temperate-breeding species have long annual migrations. It has been proposed that life history is intrinsically coupled to the ‘intensity’ of physiological functions such as energy metabolism, and several studies have revealed lower metabolic rates in tropical birds compared to temperate species, as expected from ‘slow’ pace of life in the tropics. However, it has also been proposed that lower metabolism in tropical species is due to life in a stable, warm habitat that does not require high metabolic expenditures for thermoregulation or migration, and is not a result of ‘slow’ life history traits. To resolve this question, I discuss evidence from work on energy metabolism and life history in Australian and Peruvian birds.
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Chappell, M. (2015). The ‘pace of life’: are there links between life history and energy metabolism in birds?. Santiago de Cali: Universidad ICESI. Facultad de Ciencias Naturales.