Energy costs of subduing and swallowing prey for a lizard

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dc.contributor.author Pough, F. Harvey en_US
dc.contributor.author Andrews, Robin en_US
dc.date.accessioned 2006-08-28T14:40:29Z en_US
dc.date.available 2006-08-28T14:40:29Z en_US
dc.date.issued 1985-10 en_US
dc.identifier.citation Ecology 66N5 (1985) 1525-1533 en_US
dc.identifier.issn 0012-9658 en_US
dc.identifier.uri http://hdl.handle.net/1850/2504 en_US
dc.description.abstract We measured the oxygen consumption (aerobic energy cost) and lactic acid production (anaerobic energy cost) of scincid lizards, Chalcides ocellatus, eating domestic crickets. Aerobic metabolism accounted for 90% or more of the total energy cost of subduing and swallowing prey. The time required to subdue and swallow a cricket was linearly correlated with oxygen consumption. Oxygen consumption increased as a power function of cricket mass, but the maximum size of crickets swallowed by the lizards was set by morphological rather than by energetic constraints. The energy cost of subduing and swallowing was 0.2-0.4% of the utilizable energy of the cricket eaten. Net energy gain per unit time spent subduing and swallowing prey (e/t) declined monotonically with increasing cricket mass. Because the energy cost of eating is trivial, the shape of the e/t curve is determined by the function relating prey mass to the time required for subduing and swallowing; the energy value of prey was proportional to prey mass, whereas the time required for subduing and swallowing increased faster than prey mass. The energy value of anthropods is so high, relative to the costs for a lizard of pursuring, subduing, and swallowing, that these costs can be ignored for most ecological purposes. en_US
dc.description.sponsorship Research was supported by a small projects grant (to R. M. Andrews) from Virginia Polytechnic Institute and State University and by Federal Hatch Funds (project number 412) from the New York State Agricultural Experiment Station (to F. H. Pough). en_US
dc.format.extent 37555 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher The Ecological Society of America: Ecology en_US
dc.subject Lizards en_US
dc.subject Swallowing prey en_US
dc.title Energy costs of subduing and swallowing prey for a lizard en_US
dc.type Article en_US
dc.identifier.url http://dx.doi.org/10.2307/1938015

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