Rates of oxygen consumption during hover-feeding of wild, unrestrained, adult male Anna hummingbirds (Calypte anna) were measured with an artificial outdoor feeder converted into a respirometer mask. A computer sampled changes in O2 concentration in air drawn through the mask, automatically detecting the presence of a hummingbird from a drop in the O2 concentration, and photoelectrically timing the duration over which the feeder functioned as a mask. Birds coming to the feeder were weighed on a trapeze perch suspended from a force transducer. Feeding bouts consisted of sallies which carried the head in and out of the feeding mask about once a second. The volume of O2 consumed per feeding sally was linearly related to the length of the sally. The energy cost of hover-feeding in five hummingbirds, mean mass 4.6 g, was 41.5 +/− 6.3 ml O2 g-1 h-1.
JOURNAL ARTICLE| 01 July 1986
Oxygen consumption during hover-feeding in free-ranging Anna hummingbirds
G. A. Bartholomew
J. R. Lighton
Online Issn: 1477-9145
Print Issn: 0022-0949
© 1986 by Company of Biologists
J Exp Biol (1986) 123 (1): 191–199.
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G. A. Bartholomew, J. R. Lighton; Oxygen consumption during hover-feeding in free-ranging Anna hummingbirds. J Exp Biol 1 July 1986; 123 (1): 191–199. doi: https://doi.org/10.1242/jeb.123.1.191
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