| standard and maximal metabolic rates of goannas (squamata:varanidae) | standard metabolic rate and maximal metabolic rate during forced exercise are examined for nine species of goanna (genus varanus), with body mass varying from 10 to 3,750 g. at 35 degrees c, the common pooled mass exponent for standard metabolic rate is 0.97 and at 25 degrees c it is 0.89, with considerable variation between species (0.43-1.20). standard metabolic rate at 35 degrees c scales interspecifically with body mass0.92 and at 25 degrees c with body mass0.87. the q10 for standard metabol ... | 1997 | 9231405 |
| lack of satellite dna species-specific homogenization and relationship to chromosomal rearrangements in monitor lizards (varanidae, squamata). | satellite dnas (stdnas) are highly repeated sequences that constitute large portions of any genome. the evolutionary dynamics of stdna (e.g. copy number, nucleotide sequence, location) can, therefore, provide an insight into genome organization and evolution. we investigated the evolutionary origin of vsarep stdna in 17 monitor lizards (seven asian, five australian, and five african) at molecular and cytogenetic level. | 2017 | 28814266 |
| digestive state influences the heart rate hysteresis and rates of heat exchange in the varanid lizard varanus rosenbergi. | to maximize the period where body temperature (tb) exceeds ambient temperature (ta), many reptiles have been reported to regulate heart rate (fh) and peripheral blood flow so that the rate of heat gain in a warming environment occurs more rapidly than the rate of heat loss in a cooling environment. it may be hypothesized that the rate of cooling, particularly at relatively cool tbs, would be further reduced during postprandial periods when specific dynamic action (sda) increases endogenous heat ... | 2005 | 15939769 |
| factorial scopes of cardio-metabolic variables remain constant with changes in body temperature in the varanid lizard, varanus rosenbergi. | the majority of information concerning the cardio-metabolic performance of varanids during exercise is limited to a few species at their preferred body temperature (t(b)) even though, being ectotherms, varanids naturally experience rather large changes in t(b). although it is well established that absolute aerobic scope declines with decreasing t(b), it is not known whether changes in cardiac output (v(b)) and/or tissue oxygen extraction, (ca(o2) - cv(o2)), are in proportion to the rate of oxyge ... | 2005 | 15576663 |
| island/mainland body size differences in australian varanid lizards. | island varanids seem to be an exception to the rule that territorial vertebrate taxa often become gigantic relative to mainland relatives when on islands, whereas non-territorial species become dwarfed (case 1978). however, no systematic island/mainland studies have examined the empirical size trends in this group of carnivorous lizards. we perform such an analysis for the australian region and critically evaluate various selective agents that might be responsible for size changes in several isl ... | 1993 | 28313866 |
| field energetics of a large carnivorous lizard, varanus rosenbergi. | field metabolic rates (fmrs; co2production) and water influx rates of varanus rosenbergi were measured seasonally by means of doubly-labelled water (3h218o). metabolic rates and water influexes were highest in summer (0.18 ml co2g-1h-1and 17.9 ml h2o kg-1day-1) and lowest in winter (0.04 ml co2g-1h-1and 6.5 ml h2o kg-1day-1). fmrs and water fluxes were intermediate in spring. it is estimated that a 1-kg v. rosenbergi would need to consume 4.7 kg of prey each year to remain in energy balance and ... | 1991 | 28312625 |
| the axial anatomy of monitor lizards (varanidae). | because the musculoskeletal anatomy of the trunk is the framework for the behaviors of locomotion, ventilation, and body support in lepidosaurs, comparative study of trunk anatomy in this group is critical for unraveling the selective pressures leading to extant diversity in axial form and function among vertebrates. this work uses gross dissection and computed tomography to describe the muscular and skeletal anatomy of the trunk of varanid lizards (varanidae, anguimorpha). gross muscle dissecti ... | 2018 | 30079494 |