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https://www.readbyqxmd.com/read/27639519/development-of-a-sperm-cryopreservation-protocol-for-the-argentine-black-and-white-tegu-tupinambis-merianae
#1
Carly Young, Nicole Ravida, Michelle Curtis, Frank Mazzotti, Barbara Durrant
Of the 934 lizard species evaluated by the International Union for the Conservation of Nature (IUCN), at least one-third is threatened with extinction. However, there are no reports of semen cryopreservation efforts for lizards. Invasive Argentine black and white tegus were captured in the Florida Everglades, and sperm was collected postmortem. Initial motility score (IMS; % motile × speed of progression(2) × 100), plasma membrane integrity (IPL), and acrosome integrity (IAC) were recorded. Sperm was diluted in TEST-yolk buffer with a final glycerol or dimethylsulfoxide (DMSO)concentration of 8%, 12%, or 16%, and frozen at 0...
August 18, 2016: Theriogenology
https://www.readbyqxmd.com/read/27487019/cryptic-sympatric-diversity-in-tegu-lizards-of-the-tupinambis-teguixin-group-squamata-sauria-teiidae-and-the-description-of-three-new-species
#2
John C Murphy, Michael J Jowers, Richard M Lehtinen, Stevland P Charles, Guarino R Colli, Ayrton K Peres, Catriona R Hendry, R Alexander Pyron
Tegus of the genera Tupinambis and Salvator are the largest Neotropical lizards and the most exploited clade of Neotropical reptiles. For three decades more than 34 million tegu skins were in trade, about 1.02 million per year. The genus Tupinambis is distributed in South America east of the Andes, and currently contains four recognized species, three of which are found only in Brazil. However, the type species of the genus, T. teguixin, is known from Bolivia, Brazil, Colombia, Ecuador, French Guyana, Guyana, Peru, Suriname, Trinidad and Tobago, and Venezuela (including the Isla de Margarita)...
2016: PloS One
https://www.readbyqxmd.com/read/27155487/genotoxicity-induced-by-roundup%C3%A2-glyphosate-in-tegu-lizard-salvator-merianae-embryos
#3
Laura G Schaumburg, Pablo A Siroski, Gisela L Poletta, Marta D Mudry
Environmental contaminants produce multiple adverse consequences at individual, population and ecosystem levels. High volumes of agrochemicals applied to great variety of crops, together with agricultural expansion, generate great concerns due to the impact for the environment and large risk implicated for wildlife. The lack of data on these threats is striking. The tegu lizard (Salvator merianae) is one of the species that live in environments under contaminant effects. Several characteristics allow proposing this species as a potential sentinel organism for the monitoring of pesticides in their habitat...
June 2016: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/27144443/postembryonic-nephrogenesis-and-persistence-of-six2-expressing-nephron-progenitor-cells-in-the-reptilian-kidney
#4
Troy Camarata, Alexis Howard, Ruth M Elsey, Sarah Raza, Alice O'Connor, Brian Beatty, Jack Conrad, Nikos Solounias, Priscilla Chow, Saima Mukta, Aleksandr Vasilyev
New nephron formation (nephrogenesis) ceases in mammals around birth and is completely absent in adults. In contrast, postembryonic nephrogenesis is well documented in the mesonephric kidneys of fishes and amphibians. The transient mesonephros in reptiles (including birds) and mammals is replaced by the metanephros during embryogenesis. Thus, one may speculate that postembryonic nephrogenesis is restricted to the mesonephric kidney. Previous reports have suggested the metanephros of non-avian reptiles (hereafter reptiles) may continually form nephrons throughout life...
2016: PloS One
https://www.readbyqxmd.com/read/27133734/reptile-thermogenesis-and-the-origins-of-endothermy
#5
Glenn J Tattersall
Extant endotherms have high rates of metabolism, elevated body temperatures, usually tight control over body temperature, and a reasonable scope for further increases in metabolism through locomotor activity. Vertebrate ectotherms, on the other hand, rely on behavioural thermoregulation and cardiovascular adjustments to facilitate warming, and generally lack specific biochemical and cellular mechanisms for sustained, elevated metabolism. Nevertheless, the ancestral condition to endothermy is thought to resemble that of many extant reptiles, which raises the question of the origins and selection pressures relevant to the transitional state...
October 2016: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/27097095/breeding-of-white-tailed-tropicbirds-phaethon-lepturus-in-the-western-south-atlantic
#6
G R Leal, P P Serafini, I Simão-Neto, R J Ladle, M A Efe
Basic information on natural history is crucial for assessing the viability of populations, but is often lacking for many species of conservation concern. One such species is the White-tailed Tropicbird, Phaethon lepturus (Mathews, 1915). Here, we address this shortfall by providing detailed information on reproductive biology, distribution and threats on the Fernando de Noronha archipelago, Brazil - the largest colony of P. lepturus in the South Atlantic. We assessed reproduction from August 2011 to January 2012 by monitoring tropicbird nests and their contents...
April 19, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/26872995/morphological-and-metabolic-adjustments-in-the-small-intestine-to-energy-demands-of-growth-storage-and-fasting-in-the-first-annual-cycle-of-a-hibernating-lizard-tupinambis-merianae
#7
Lucas Francisco R do Nascimento, Lilian Cristina da Silveira, Laura Gabriela Nisembaum, Alison Colquhoun, Agusto S Abe, Carlos Alberto Mandarim-de-Lacerda, Silvia Cristina R de Souza
Seasonal plasticity in the small intestine of neonatal tegu lizards was investigated using morphometry and analysis of enzymes involved in supplying energy to the intestinal tissue. In the autumn, the intestinal mass (Mi) was 1.0% of body mass and the scaling exponent b=0.92 indicated that Mi was larger in smaller neonates. During arousal from dormancy Mi was 23% smaller; later in spring, Mi increased 60% in relation to the autumn and the exponent b=0.14 indicated that the recovery was disproportionate in smaller tegus...
May 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/26844295/seasonal-reproductive-endothermy-in-tegu-lizards
#8
Glenn J Tattersall, Cleo A C Leite, Colin E Sanders, Viviana Cadena, Denis V Andrade, Augusto S Abe, William K Milsom
With some notable exceptions, small ectothermic vertebrates are incapable of endogenously sustaining a body temperature substantially above ambient temperature. This view was challenged by our observations of nighttime body temperatures sustained well above ambient (up to 10°C) during the reproductive season in tegu lizards (~2 kg). This led us to hypothesize that tegus have an enhanced capacity to augment heat production and heat conservation. Increased metabolic rates and decreased thermal conductance are the same mechanisms involved in body temperature regulation in those vertebrates traditionally acknowledged as "true endotherms": the birds and mammals...
January 2016: Science Advances
https://www.readbyqxmd.com/read/26798099/draft-genome-sequences-of-two-salmonella-enterica-serotype-infantis-strains-isolated-from-a-captive-western-lowland-gorilla-gorilla-gorilla-gorilla-and-a-cohabitant-black-and-white-tegu-tupinambis-merianae-in-brazil
#9
Tatiane A Paixão, Fernanda M Coura, Marcelo C C Malta, Herlandes P Tinoco, Angela T Pessanha, Felipe L Pereira, Carlos A G Leal, Marcos B Heinemann, Henrique C P Figueiredo, Renato L Santos
The draft genome sequences of two Salmonella enterica serotype Infantis isolates are reported here. One of the strains was isolated from a western lowland gorilla (Gorilla gorilla gorilla) with colitis. The second strain was isolated from a reptile that inhabited the same premises. Whole-genome sequencing demonstrated that these isolates were not clonal.
2016: Genome Announcements
https://www.readbyqxmd.com/read/26747909/winter-metabolic-depression-does-not-change-arterial-baroreflex-control-of-heart-rate-in-the-tegu-lizard-salvator-merianae
#10
Lucas A Zena, Valter Dantonio, Luciane H Gargaglioni, Denis V Andrade, Augusto S Abe, Kênia C Bícego
Baroreflex regulation of blood pressure is important for maintaining appropriate tissue perfusion. Although temperature affects heart rate (fH) reflex regulation in some reptiles and toads, no data are available on the influence of temperature-independent metabolic states on baroreflex. The South American tegu lizard Salvator merianae exhibits a clear seasonal cycle of activity decreasing fH along with winter metabolic downregulation, independent of body temperature. Through pharmacological interventions (phenylephrine and sodium nitroprusside), the baroreflex control of fH was studied at ∼ 25 °C in spring-summer- and winter-acclimated tegus...
March 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/26590472/do-sex-body-size-and-reproductive-condition-influence-the-thermal-preferences-of-a-large-lizard-a-study-in-tupinambis-merianae
#11
Nicolas Rodolfo Cecchetto, Sergio Naretto
Body temperature is a key factor in physiological processes, influencing lizard performances; and life history traits are expected to generate variability of thermal preferences in different individuals. Gender, body size and reproductive condition may impose specific requirements on preferred body temperatures. If these three factors have different physiological functions and thermal requirements, then the preferred temperature may represent a compromise that optimizes these physiological functions. Therefore, the body temperatures that lizards select in a controlled environment may reflect a temperature that maximizes their physiological needs...
October 2015: Journal of Thermal Biology
https://www.readbyqxmd.com/read/26467019/molecular-characterization-and-classification-of-trypanosoma-spp-venezuelan-isolates-based-on-microsatellite-markers-and-kinetoplast-maxicircle-genes
#12
E Sánchez, T Perrone, G Recchimuzzi, I Cardozo, N Biteau, P M Aso, A Mijares, T Baltz, D Berthier, L Balzano-Nogueira, M I Gonzatti
BACKGROUND: Livestock trypanosomoses, caused by three species of the Trypanozoon subgenus, Trypanosoma brucei brucei, T. evansi and T. equiperdum is widely distributed throughout the world and constitutes an important limitation for the production of animal protein. T. evansi and T. equiperdum are morphologically indistinguishable parasites that evolved from a common ancestor but acquired important biological differences, including host range, mode of transmission, distribution, clinical symptoms and pathogenicity...
2015: Parasites & Vectors
https://www.readbyqxmd.com/read/26285591/the-relationship-between-body-temperature-heart-rate-breathing-rate-and-rate-of-oxygen-consumption-in-the-tegu-lizard-tupinambis-merianae-at-various-levels-of-activity
#13
Joanna Piercy, Kip Rogers, Michelle Reichert, Denis V Andrade, Augusto S Abe, Glenn J Tattersall, William K Milsom
The present study determined whether EEG and/or EMG recordings could be used to reliably define activity states in the Brazilian black and white tegu lizard (Tupinambis merianae) and then examined the interactive effects of temperature and activity states on strategies for matching O2 supply and demand. In a first series of experiments, the rate of oxygen consumption (VO2), breathing frequency (fR), heart rate (fH), and EEG and EMG (neck muscle) activity were measured in different sleep/wake states (sleeping, awake but quiet, alert, or moving)...
December 2015: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/26266400/daily-and-annual-cycles-in-thermoregulatory-behaviour-and-cardio-respiratory-physiology-of-black-and-white-tegu-lizards
#14
Colin E Sanders, Glenn J Tattersall, Michelle Reichert, Denis V Andrade, Augusto S Abe, William K Milsom
This study was designed to determine the manner in which metabolism is suppressed during dormancy in black and white tegu lizards (Tupinambis merianae). To this end, heart rate (fH), respiration rate (fR), and deep body temperature (Tb) were continuously monitored in outdoor enclosures by radio-telemetry for nine months. There was a continuous decline in nighttime breathing and heart rate, at constant Tb, throughout the late summer and fall suggestive of an active metabolic suppression that developed progressively at night preceding the entrance into dormancy...
December 2015: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/25468674/variant-surface-glycoproteins-from-venezuelan-trypanosome-isolates-are-recognized-by-sera-from-animals-infected-with-either-trypanosoma-evansi-or-trypanosoma-vivax
#15
Rocío Camargo, Adriana Izquier, Graciela L Uzcanga, Trina Perrone, Alvaro Acosta-Serrano, Liomary Carrasquel, Laura P Arias, José L Escalona, Vanessa Cardozo, José Bubis
Salivarian trypanosomes sequentially express only one variant surface glycoprotein (VSG) on their cell surface from a large repertoire of VSG genes. Seven cryopreserved animal trypanosome isolates known as TeAp-ElFrio01, TEVA1 (or TeAp-N/D1), TeGu-N/D1, TeAp-Mantecal01, TeGu-TerecayTrino, TeGu-Terecay03 and TeGu-Terecay323, which had been isolated from different hosts identified in several geographical areas of Venezuela were expanded using adult albino rats. Soluble forms of predominant VSGs expressed during the early infection stages were purified and corresponded to concanavalin A-binding proteins with molecular masses of 48-67 kDa by sodium dodecyl sulfate-polyacrylamide gel electropohoresis, and pI values between 6...
January 15, 2015: Veterinary Parasitology
https://www.readbyqxmd.com/read/24740578/linear-versus-geometric-morphometric-approaches-for-the-analysis-of-head-shape-dimorphism-in-lizards
#16
Anne-Claire Fabre, Raphäel Cornette, Katleen Huyghe, Denis V Andrade, Anthony Herrel
Differences between the sexes may arise because of differences in reproductive strategy, with females investing more in traits related to reproductive output and males investing more in traits related to resource holding capacity and territory defence. Sexual dimorphism is widespread in lizards and in many species males and females also differ in head shape. Males typically have bigger heads than females resulting in intersexual differences in bite force. Whereas most studies documenting differences in head dimensions between sexes use linear dimensions, the use of geometric morphometrics has been advocated as more appropriate to characterize such differences...
September 2014: Journal of Morphology
https://www.readbyqxmd.com/read/24681119/spontaneous-genetic-damage-in-the-tegu-lizard-tupinambis-merianae-the-effect-of-age
#17
Laura G Schaumburg, Gisela L Poletta, Pablo A Siroski, Marta D Mudry
Several studies indicate that certain factors such as age, sex or nutritional status among others, may affect the level of DNA damage, both induced and spontaneous, so it is very important to consider them for a more accurate interpretation of the findings. The aim of this study was to analyze the influence of age, sex, and nest of origin on spontaneous genetic damage of Tupinambis merianae determined by the comet assay (CA) and the micronucleus (MN) test, in order to improve reference data for future in vivo studies of xenobiotics exposure in this species...
May 15, 2014: Mutation Research. Genetic Toxicology and Environmental Mutagenesis
https://www.readbyqxmd.com/read/24379597/association-between-tnf-%C3%AE-and-il-1%C3%AE-genotypes-vs-helicobacter-pylori-infection-in-indonesia
#18
Yang Zhao, Jing-Wen Wang, Tsutomu Tanaka, Akihiro Hosono, Ryosuke Ando, Shinkan Tokudome, Soeripto, F X Ediati Triningsih, Tegu Triono, Suwignyo Sumoharjo, E Y Wenny Astuti Achwan, Stephanus Gunawan, Yu-Min Li
AIM: To investigate the correlation between the Helicobacter pylori (H. pylori) infection and host genetic background of healthy populations in Indonesia. METHODS: In March 2007, epidemiological studies were undertaken on the general population of a city in Indonesia (Mataram, Lombok). The participants included 107 men and 187 women, whose ages ranged from 6 to 74 years old, with an average age of 34.0 (± 14.4) (± SD). The H. pylori of subject by UBT method determination, and through the polymerase chain reaction with confronting two-pair primers (PCR-CTPP) method parsing the single nucleotide polymorphism of interleukin (IL)-8, IL-4, IL-1β, CD14, tumor necrosis factor (TNF-α) and tyrosine-protein phosphates non-receptor type 11 (PTPN11) genotypes...
December 14, 2013: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/24248875/predatory-behavior-intupinambis-teguixin-sauria-teiidae-i-tongue-flicking-responses-to-chemical-food-stimuli
#19
A A Yanosky, D E Iriart, C Mercolli
Black tegu lizards (Tupinambis teguixin) have the ability to detect food odors and discriminate between them and nonfood odors. This was tested by offering chemical stimuli on cotton-tipped applicators to the animals. Stimuli were from two plant and two animal species known to be principal items in these lizards' diets, demineralized water as an odorless control, and eaude-cologne as an odorous control lacking feeding or social importance. Tongueflick attack score, latency to attack, preattack tongue-flicks, and number of attacks were analyzed...
February 1993: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/24171701/physaloptera-bainae-n-sp-nematoda-physalopteridae-parasitic-in-salvator-merianae-squamata-teiidae-with-a-key-to-physaloptera-species-parasitizing-reptiles-from-brazil
#20
Felipe B Pereira, Philippe V Alves, Bárbara M Rocha, Sueli de Souza Lima, José L Luque
Physaloptera bainae n. sp. (Nematoda: Physalopteridae) from stomach of the large "tegú" lizard Salvator merianae (Squamata: Teiidae), collected in an ecological park that is part of the Atlantic Rainforest biome in Juiz de Fora, Minas Gerais, Brazil, is described. The new species which has females with didelphic uterus, is the only species of the genus exhibiting external teeth in the form of 4 spines that are organized in a cross-shaped pattern at the anterior apical end, with 2 minute adcloacal papillae on the anterior part of cloacal aperture in males and a large cuticular expansion at the anterior end of females...
April 2014: Journal of Parasitology
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