[PDF] Top 20 MUSCLE PERFORMANCE IN HOVERING HUMMINGBIRDS

... The results of the aerodynamic analyses for individual birds are presented in Table 3. Significant differences between the two species were only seen in the perfect elastic storage analysis with muscle power ... See full document

... flight performance has been repeatedly studied in physically variable gas mixtures, most commonly in normoxic ...trials, hummingbirds compensate for increased flight requirements by substantially increasing ... See full document

... Flight muscle was assumed to equal 25 % of the body mass, given published data for ruby- throated and other hummingbird species (Hartman, 1961; Greenewalt, 1962; Wells, ...of muscle mass, the use of 25 % ... See full document

... of muscle activity was ...of hummingbirds limits the time available for flight muscle relaxation before the next half stroke of a ...of hovering hummingbirds, across all flight speeds ... See full document

... flight performance have generally been implemented within the contemporary ...animals; hummingbirds and euglossine orchid bees hovering in such low-density but normoxic mixtures have demonstrated ... See full document

... of muscle activations of the PM, PP and PS was more repeatable than the intensity of the activations during hovering and yaw turns ...as hummingbirds adjust to low air density, lift weights ... See full document

... Over the past decade, insect flight has attracted a lot of interest in a variety of disciplines in science and engineering. As a result, many experimental investigations (e.g. Ellington et al., 1996; Dickinson et al., ... See full document

... the hovering performance of four hummingbird ...by hummingbirds and also because our investigation took place during the breeding season, when female birds were tending eggs or .... ... See full document

... in setting the lower limit to vertebrate homeotherm body mass. It is significant that the smallest vertebrate homeotherms, including Thai bumblebee bats, Etruscan shrews and Cuban bee hummingbirds, all weigh ... See full document

... of wingbeat frequency. Our conclusions are based on kinematic, thermal and respirometric measurements from a single species, Euglossa imperialis, and wingbeat frequency recordings from five additional species. Both ... See full document

... rates. Hummingbirds (family Trochilidae) are known for their extreme levels of oxygen consumption during flight (Suarez, 1992; Suarez, 1996), but less appreciated is the extent to which this group also comprises ... See full document

... throated hummingbirds, similar energetic limits to performance under hyperoxic and normoxic treatments with heliox indicate that hovering flight is not constrained by oxygen ...ruby-throated ... See full document

... The performance of mechanical work by the actomyosin interaction during the crossbridge cycle, utilizing chemical energy derived from the hydrolysis of ...the performance of mechanical ... See full document

... of muscle is a function of its operating frequency (contraction cycles/time), stress (force/cross sectional area) and strain (fractional change in length per contraction) (Pennycuick and Rezende, ... See full document

... As the smallest homeotherms, hummingbirds suffer from low thermal inertia and high heat loss. Flapping flight is energetically expensive, and convective cooling due to wing and air movements could further ... See full document

... of hummingbirds to lift loads ...load-lifting performance of a large number of insects, bats and birds (Marden, ...burst performance suggests an even greater capacity to generate additional power and ... See full document

... experiment, hummingbirds also decreased their hover-feeding duration with decreasing air ...the hummingbirds hovered for longer than when feeding through normoxia-infused corollas at the same ...increased ... See full document

... increased muscle power output as the inertial power requirement far outweighs the aerodynamic power requirement (by a factor of 4, Wells, ...1993). Muscle power output was calculated from the total body ... See full document

... that hummingbirds are easily drawn to ...The hummingbirds will find the feeder once they are attracted to an ...Pesticides Hummingbirds eat insects in addition to nectar and sugar ...for ... See full document

... On the basis of the uncoupling activity of UCP2 and UCP3, it has been proposed that, as with UCP1, they too could contribute to adaptive thermogenesis. However, the physiological role of UCP2 and UCP3 is still highly ... See full document