geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Thermal variability in body temperature in an ectotherm Are cloacal temperatures good indicators of tortoise body temperature?


, : Thermal variability in body temperature in an ectotherm Are cloacal temperatures good indicators of tortoise body temperature?. Journal of Thermal Biology

Historically, studies of reptilian thermal biology have compared ambient temperatures (T a ) to body temperatures (T b ) from the animal under study, with T b usually taken from the cloaca and various instruments being used to measure T b . The advent of surgically implanted miniature temperature loggers has offered the opportunity to test the efficacy of cloacal T b as a measurement in thermoregulatory studies. We expected that there was a difference between skin, cloacal, and core T b s. Temperatures were measured from various positions on leopard tortoises (Stigmochelys pardalis) using thermocouples and miniature temperature loggers, including surgically implanted temperature loggers. Measurements of temperature from various positions on and in the tortoise were significantly different from T a . Cloacal T b s were significantly lower than all other body temperatures measured, and core Tb s were significantly different from cloacal Tb, skin and carapace temperatures. In addition, significant differences were found between measures of temperature from other parts of the body. The variations between core T b , cloacal T b and other measures of T b indicated that there are large thermal gradients within the body of a relatively large tortoise at any given time with cloacal T b not an accurate measure of core T b . Reptilian thermal biology studies regularly investigate body temperatures (T b ). We tested the efficacy of cloacal T b compared with core T b in Stigmochelys pardalis. Cloacal T b s were lower than all other body temperatures measured. Cloacal T b may not be an accurate measure of core T b .

US$19.90

DOI: 10.1016/j.jtherbio.2013.02.002


Other references

Horvat, S.; Medrano, J.F., 1998: A 500-kb YAC and BAC contig encompassing the high-growth deletion in mouse chromosome 10 and identification of the murine Raidd/Cradd gene in the candidate region. The mouse high growth (hg) gene was identified in a selection experiment for rapid growth. It produces a 30-50% increase in weight gain of homozygous individuals without resulting in obesity. Recently, hg was mapped to a deletion around marker D10...

Mian, M.A.; Malta, E., 1985: The sympathomimetic activity of (+/-)-pindolol at beta 1- and beta 2-adrenoceptor sites. In isolated right atrial and stilboestrol-pretreated uterine preparations from both guinea-pigs and rats, pindolol elicited propranolol-sensitive positive chronotropic and smooth muscle relaxant actions. Although the pD2 values for pindolol (8.4-9...

Elliott L.L.; Busse L.B.; Lyons L.E., 1984: Syllable identification by younger and older adults. Journal of the Acoustical Society of America 76(SUPPL 1): S29

Morgan, A.Aiken.; Marsiske, M.; Whitfield, K.E., 2008: Characterizing and explaining differences in cognitive test performance between african american and European American older adults. The present study examined differences in cognitive performance of African American and European American older adults on cognitive and intellectual measures, and the extent to which literacy status or reading level was useful in explaining these...

Simonyi, A.; Murch, K.; Sun, G.Y., 2002: Age-related alterations of extracellular signal-regulated kinase 2 mRNA expression in the rat brain. Journal of Neurochemistry 81(Supplement 1): 89, June

Bird P.R., 1990: A note on budgerigars in hamilton victoria australia. Victorian Naturalist (Blackburn) 107(3): 107-108

Kumari, E., 1975: 20 years of the Baltic Commission for the study of bird migration. Ring, 83: 224-226

Madden, J.M.; Soumerai, S.B.; Lieu, T.A.; Mandl, K.D.; Zhang, F.; Ross-Degnan, D., 2003: Effects on breastfeeding of changes in maternity length-of-stay policy in a large health maintenance organization. Objective: The purpose of this study was to evaluate the effects on breastfeeding rates of a private-sector early discharge program and a subsequent government mandate guaranteeing 48 h of hospital coverage. Methods: Interrupted time-series analys...

Fujita, H.; Honma, Y., 1968: Some observations on the fine structure of the endostyle of larval lampreys, ammocoetes of Lampetra japonica. General and Comparative Endocrinology 11(1): 111-131

Benstead, P.J.; Jeffs, C.J.S.; Hearn, R.D., 1998: Riparian bird densities along four tributaries of the Rio Parana in north-eastern Argentina. Linear densities of birds and mammals were registered on four tributaries of the Rio Parana in Misiones, Argentina. In a recent expedition a survey was conducted in order to determine the status of the olivaceous cormorant Mergus octosetaceus for...