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Basal metabolic rate in migratory waders: intra‐individual, intraspecific, interspecific and seasonal variation
Author(s) -
Kvist A.,
Lindström Å.
Publication year - 2001
Publication title -
functional ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 154
eISSN - 1365-2435
pISSN - 0269-8463
DOI - 10.1046/j.0269-8463.2001.00549.x
Subject(s) - intraspecific competition , biology , interspecific competition , basal metabolic rate , juvenile , allometry , seasonality , ecology , zoology , endocrinology
Summary1 Basal metabolic rates (BMR) were measured in 36 adult and 119 juvenile waders of 19 species on autumn migration in southern Sweden. 2 In a comparison with literature data, it was found that juvenile BMR was generally lower than at the onset of migration in the Arctic and slightly higher than on African wintering grounds. 3 The seasonal differences may reflect local physiological adaptations or possibly a gradual decline from high premigratory levels due to growth. Our data contradict the idea that BMR is high during migration as an adaptation to generally high levels of energy expenditure. 4 The allometric exponent, scaling BMR to body mass, was significantly higher within individuals (1·19) and within species (1·82) than among species (0·62). 5 The high intra‐individual exponent indicates that non‐fat tissues, with a high metabolic activity, are involved in the mass changes during migratory stopover. 6 The high intraspecific exponent indicates that tissues with a high metabolic activity contributed disproportionately to variation in body mass among individuals or that larger individuals had elevated mass specific metabolic rates of some tissues.