Results 111 to 120 of about 379 (150)

Thermoregulation in the desert tortoise, Gopherus agassizii

Comparative Biochemistry and Physiology Part A: Physiology, 1971
Abstract 1. 1. Deep body and shell surface temperatures were monitored via radio-telemetry from unrestrained desert tortoises in their natural habitat. 2. 2. The surface of the carapace acts as a buffer against solar radiation, resulting in deep body temperatures up to 10°C below shell surface at the time of the midday retreat to burrows. 3.
Samuel M. McGinnis, William G. Voigt
openaire   +1 more source

Desert Tortoise Gopherus agassizii : Cutaneous Water Loss

Science, 1966
Evaporative water loss from the integument of the desert tortoise Gopherus agassizii constitutes a major proportion of the water loss, but is far less than in tortoises from wetter regions. Respiratory water loss also is less.
K, Schmidt-Nielsen, P J, Bentley
openaire   +3 more sources

Seasonality in Plasma Thyroxine in the Desert Tortoise, Gopherus agassizii

General and Comparative Endocrinology, 2001
To characterize seasonal changes in thyroid function in a terrestrial reptile, thyroid hormones were measured over a period of 2 years in desert tortoises, Gopherus agassizii, maintained at the Desert Tortoise Conservation Center in Las Vegas, Nevada. In all samples, triiodothyronine was nondetectable (less than 0.1 ng/ml).
K A, Kohel, D S, MacKenzie, D C, Rostal, J S, Grumbles, V A, Lance   +4 more
openaire   +2 more sources

OSTEOPHAGY BY THE DESERT TORTOISE (GOPHERUS AGASSIZII)

The Southwestern Naturalist, 2007
Abstract The desert tortoise (Gopherus agassizii) has undergone significant declines in the past several decades. Thus, many carcasses are present across the desert landscape. Here we report on osteophagy by the desert tortoise, specifically the consumption of bones from deceased desert tortoises.
Andrew D. Walde, David K. Delaney, Meagan L. Harless, Larry L. Pater   +3 more
openaire   +1 more source

Detection of Mycoplasma agassizii in the Texas Tortoise (Gopherus berlandieri)

Journal of Wildlife Diseases, 2013
Mycoplasma agassizii causes upper respiratory tract disease (URTD) in Texas tortoises (Gopherus berlandieri). To determine exposure to and shedding of M. agassizii, we collected blood samples and nasal swabs from 40 free-ranging Texas tortoises on public and private lands in Texas, USA, from May to October 2009.
Amanda L, Guthrie, C LeAnn, White, Mary B, Brown, Thomas W, deMaar   +3 more
openaire   +2 more sources

HISTOMORPHOMETRIC STUDIES OF DERMAL BONE IN THE DESERT TORTOISE, GOPHERUS AGASSIZII

Journal of Wildlife Diseases, 1992
Dermal bone biopsies were collected from the periphery of the carapaces of adult desert tortoises (Gopherus agassizii) from grazed and ungrazed habitats near the Arizona/Utah border (USA). Quantitative bone histomorphometry was performed on these biopsies as well as on dermal bone biopsies collected from captive juvenile desert tortoises.
T J, Wronski, C F, Yen, E R, Jacobson
openaire   +2 more sources

Size-Specific Fecundity of the Desert Tortoise (Gopherus agassizii)

Journal of Herpetology, 1998
We determined the annual fecundity of desert tortoises using x-rays from 1993 through 1995 at Yucca Mountain, Nevada. The smallest tortoise to reproduce was 209 mm carapace length (CL); eleven smaller tortoises did not reproduce. The mean age of first reproduction was estimated to be 19-20 years.
James M. Mueller, Kamila R. Sharp, Katherine K. Zander, Danny L. Rakestraw, Kurt R. Rautenstrauch, Patrick E. Lederle   +5 more
openaire   +1 more source

Western blot can distinguish natural and acquired antibodies to Mycoplasma agassizii in the desert tortoise (Gopherus agassizii)

Journal of Microbiological Methods, 2008
Mycoplasma agassizi has been identified as a cause of upper respiratory tract disease (URTD) in the threatened Mojave population of the desert tortoise (Gopherus agassizii), and anti-M. agassizii antibodies have been found by ELISA in as many as 15% of these animals across their geographic range.
Kenneth W, Hunter, Sally A, Dupré, Tiffanny, Sharp, Franziska C, Sandmeier, C Richard, Tracy   +4 more
openaire   +2 more sources

Polymorphic microsatellite markers for the Mojave desert tortoise, Gopherus agassizii

Molecular Ecology Resources, 2008
AbstractWe describe primers and polymerase chain reaction (PCR) conditions to amplify 14 tri‐ and tetranucleotide microsatellite loci for the Mojave desert tortoise (Gopherus agassizii). Across three populations (87 individuals) located in the Mojave Desert, USA, the markers yielded a range of four to 33 alleles and an average observed heterozygosity ...
B E, Hagerty, M M, Peacock, V S, Kirchoff, C R, Tracy   +3 more
openaire   +2 more sources

Soluble scute proteins of healthy and ill desert tortoises (Gopherus agassizii)

American Journal of Veterinary Research, 2001
Abstract Objectives—To characterize protein composition of shell scute of desert tortoises and to determine whether detectable differences could be used to identify healthy tortoises from tortoises with certain illnesses. Animals—20 desert tortoises.
B L, Homer, C, Li, K H, Berry, N D, Denslow, E R, Jacobson, R H, Sawyer, J E, Williams   +6 more
openaire   +2 more sources