Geographic variation in metabolic seasonal acclimatization in House Finches

Article Abstract:

Body composition and enzymatic activity analyses indicate that seasonal acclimatization occurs through shifts in fat storage and catabolic capacity in House Finches (Carpodacus mexicanus) from Colorado (CO) and Michigan (MI). Seasonal metabolic changes are lacking in birds from southern California. House Finches from MI show seasonal variations in peak metabolic rate and lean mass which are lacking in CO birds. MI birds also grow fatter in winter than CO birds. The changes appear to be due either to different physiological mechanisms for acclimatization or to direct or indirect responses to different altitudes.

Analysis, Body composition, Finches, Darwin's finches, Acclimatization, Acclimatization (Biology)

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Higher winter mortality of the barn owl compared to the long-eared owl and the tawny owl: influence of lipid reserves and insulation?

Article Abstract:

The barn owl, tawny owl and long-eared owl are commonly found in Europe, but the tawny owl and long-eared owl have less winter mortality than the barn owl. It is commonly believed that barn owls' greater mortality rates during winter are caused by its lower store of adipose tissue. A new study compares the adiposity of the three species. The study finds that adiposity is similar and suggests that hunting behaviour, feather insulation and diet may explain winter mortality in barn owls.

Patient outcomes, Mortality, Owls, Nocturnal animals

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Circadian metabolic responses to food deprivation in the Black-shouldered Kite

Article Abstract:

The metabolic responses to food deprivation of the Black-shouldered Kite were investigated. The basal metabolic rate (BMR) was 60-70% of those predicted in allometric equations. Marked circadian rhythms of BMR and body temperature were exhibited, although there was no indication of metabolic depression or adaptive hypothermia in response to food deprivation. The results indicate a tolerance of periodic, limited food supplies.

Circadian rhythms

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