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Journal articles on the topic 'Emydura krefftii'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2023

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1

Cowan, ML, SR Raidal, and A. Peters. "Herpesvirus in a captive Australian Krefft's river turtle (Emydura macquarii krefftii)." Australian Veterinary Journal 93, no. 1-2 (January 2015): 46–49. http://dx.doi.org/10.1111/avj.12290.

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2

Banks, CB. "Nesting, Incubation and Hatchling Growth in Captive Kreffts Tortoise, Emydura-Krefftii." Wildlife Research 14, no. 4 (1987): 551. http://dx.doi.org/10.1071/wr9870551.

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Krefft's tortoise has been maintained at the Royal Melbourne Zoo since 1972. From 1978 to 1983 inclusive, 24 clutches of eggs were laid. For 20 clutches, mean clutch size was 17 eggs, mean egg weight was 7.9 g, mean egg dimensions were 35 x 20 mm, and pipping commenced after 46 days at a constant incubation temperature of 30�C. Internesting periods were 30-51 days, with one female laying four clutches in one season. Hatchling growth was monitored, and young attained a mean weight of 53 g and mean carapace length of 73 mm after 12 months. Development of the embryonic attachment zone was also monitored. The results gained are compared with published data from two populations of wild tortoises.

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3

Banks, Chris B. "Oviducal development in a Krefft's river turtle,Emydura krefftii gray (Chelonia: Chelidae)." Zoo Biology 4, no. 2 (1985): 111–14. http://dx.doi.org/10.1002/zoo.1430040204.

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4

Georges, Arthur. "Reproduction of the Australian freshwater turtle Emydura krefftii (Chelonia: Chelidae)." Journal of Zoology 201, no. 3 (August 20, 2009): 331–50. http://dx.doi.org/10.1111/j.1469-7998.1983.tb04280.x.

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5

Wirth, Wytamma, and Ellen Ariel. "Temperature-dependent infection of freshwater turtle hatchlings, Emydura macquarii krefftii, inoculated with a ranavirus isolate (Bohle iridovirus, Iridoviridae)." FACETS 5, no. 1 (January 1, 2020): 821–30. http://dx.doi.org/10.1139/facets-2020-0012.

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Fish, amphibians, and reptiles exhibit temperature-dependent ranaviral disease. We performed an experimental infection at four different environmental temperatures (16, 22, 28, and 34 °C) to investigate the effect of temperature on ranaviral infection in Krefft’s turtle ( Emydura macquarii krefftii). Infection rates and viral loads were determined by quantitative polymerase chain reaction to detect ranaviral DNA in liver samples at 21 d postexposure. The rate of infection differed across the temperature treatment groups. Infection rates were 44%, 90%, 60%, and 10% for the 16, 22, 28, and 34 °C temperature groups, respectively. Highest viral load was observed in the 28 °C temperature group, and there was a statistically significant difference in viral load between the 16 and 28 °C temperature groups ( p = 0.027). Based on the results of this study, the temperature of maximal infection rate for ranaviral infection in Krefft’s river turtles is estimated to be 23.2 °C (SD = 4.5). The findings of this study can inform management decisions in terms of disease control and treatment and form a platform for modelling disease outbreaks.

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6

Flint, M., DJ Limpus, CJ Limpus, JC Patterson-Kane, JA Eales, and PC Mills. "Biochemical and hematological reference intervals for Krefft’s turtles Emydura macquarii krefftii from the Burnett River Catchment, Australia." Diseases of Aquatic Organisms 95, no. 1 (May 24, 2011): 43–48. http://dx.doi.org/10.3354/dao02352.

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7

Platt, Thomas R., and David Blair. "Two New Species of Uterotrema (Digenea: Spirorchidae) Parasitic in Emydura krefftii (Testudines: Chelidae) from Australia." Journal of Parasitology 82, no. 2 (April 1996): 307. http://dx.doi.org/10.2307/3284166.

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8

McKnight, Donald T., Kyall R. Zenger, Ross A. Alford, and Roger Huerlimann. "Microbiome diversity and composition varies across body areas in a freshwater turtle." Microbiology 166, no. 5 (May 1, 2020): 440–52. http://dx.doi.org/10.1099/mic.0.000904.

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There is increasing recognition that microbiomes are important for host health and ecology, and understanding host microbiomes is important for planning appropriate conservation strategies. However, microbiome data are lacking for many taxa, including turtles. To further our understanding of the interactions between aquatic microbiomes and their hosts, we used next generation sequencing technology to examine the microbiomes of the Krefft’s river turtle (Emydura macquarii krefftii). We examined the microbiomes of the buccal (oral) cavity, skin on the head, parts of the shell with macroalgae and parts of the shell without macroalgae. Bacteria in the phyla Proteobacteria and Bacteroidetes were the most common in most samples (particularly buccal samples), but Cyanobacteria , Deinococcus-thermus and Chloroflexi were also common (particularly in external microbiomes). We found significant differences in community composition among each body area, as well as significant differences among individuals. The buccal cavity had lower bacterial richness and evenness than any of the external microbiomes, and it had many amplicon sequence variants (ASVs) with a low relative abundance compared to other body areas. Nevertheless, the buccal cavity also had the most unique ASVs. Parts of the shell with and without algae also had different microbiomes, with particularly obvious differences in the relative abundances of the families Methylomonaceae, Saprospiraceae and Nostocaceae . This study provides novel, baseline information about the external microbiomes of turtles and is a first step in understanding their ecological roles.

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9

Wirth, Wytamma, Lin Schwarzkopf, Lee F. Skerratt, Anna Tzamouzaki, and Ellen Ariel. "Dose-dependent morbidity of freshwater turtle hatchlings, Emydura macquarii krefftii, inoculated with Ranavirus isolate (Bohle iridovirus, Iridoviridae)." Journal of General Virology 100, no. 10 (October 1, 2019): 1431–41. http://dx.doi.org/10.1099/jgv.0.001324.

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Ranaviral infections cause mass die-offs in wild and captive turtle populations. Two experimental studies were performed to first determine the susceptibility of an Australian turtle species (Emydura macquarii krefftii) to different routes of infection and second examine the effect of viral titre on the morbidity in hatchlings. All inoculation routes (intracoelomic, intramuscular and oral) produced disease, but the clinical signs, histopathology and time to onset of disease varied with the route. The median infectious and lethal doses for intramuscularly inoculated hatchlings were 102 . 52 (1.98–2.93) and 104.43 (3.81–5.19) TCID50 ml−1, respectively. Clinical signs began 14 to 29 days post-inoculation and the median survival time was 22 days (16–25) across all dose groups. For every 10-fold increase in dose, the odds of developing any clinical signs or severe clinical signs increased by 3.39 [P<0.01, 95 % confidence interval (CI): 1.81–6.36] and 3.71 (P<0.01, 95 % CI: 1.76–7.80), respectively. Skin lesions, previously only reported in ranaviral infection in lizards, were observed in the majority of intramuscularly inoculated hatchlings that developed ranaviral disease. The histological changes were consistent with those in previous reports for reptiles and consisted of necrosis at or near the site of injection, in the spleen, liver and oral cavity. Systemic inflammation was also observed, predominantly affecting necrotic organs. The estimates reported here can be used to model ranaviral disease and quantify and manage at-risk populations.

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10

Wilson, Madeleine, and Ivan R. Lawler. "Diet and digestive performance of an urban population of the omnivorous freshwater turtle (Emydura krefftii) from Ross River, Queensland." Australian Journal of Zoology 56, no. 3 (2008): 151. http://dx.doi.org/10.1071/zo08007.

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We determined the diet of Emydura krefftii, an abundant and widespread omnivorous freshwater turtle in north-eastern Australia, in an artificial urban impoundment. A potentially significant dietary influence is feeding of bread to the turtles by members of the public. This has led to the formation of a dense aggregation of the species at one end of the impoundment. The most substantial component of the diet by volume was the introduced weed Cabomba. Bread and figs were also important but only in specific locations. Bread was offered to turtles at the feeding aggregation in amounts close to the maximum eaten by captive turtles, and thus probably negatively influences nutrient status. Animal matter (insects, vertebrate carrion) was only a small proportion of the diet. We quantified intake, digestibility and transit time in the laboratory for four commonly occurring dietary items. Fish and bread were the most highly digestible food items and passed quickly through the gut. Despite its contribution to the diet in the wild, captive turtles ate little Cabomba, and it passed slowly through the gut and was poorly digested. Future research on interactive effects between diet items on digestive performance is recommended to understand the performance of turtles on apparently poor-quality diets.

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11

Todd, Erica V., David Blair, and Dean R. Jerry. "Influence of drainage divides versus arid corridors on genetic structure and demography of a widespread freshwater turtle, Emydura macquarii krefftii , from Australia." Ecology and Evolution 4, no. 5 (February 11, 2014): 606–22. http://dx.doi.org/10.1002/ece3.968.

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12

Todd, Erica, David Blair, Mark Hamann, and Dean Jerry. "Twenty-nine microsatellite markers for two Australian freshwater turtles, Elseya albagula and Emydura macquarii krefftii: development from 454-sequence data and utility in related taxa." Conservation Genetics Resources 3, no. 3 (January 5, 2011): 449–56. http://dx.doi.org/10.1007/s12686-010-9377-0.

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13

Wirth, Wytamma, María J. Forzán, Lin Schwarzkopf, and Ellen Ariel. "Pathogenesis of Bohle iridovirus infection in Krefft’s freshwater turtle hatchlings (Emydura macquarii krefftii)." Veterinary Pathology, September 9, 2022, 030098582211225. http://dx.doi.org/10.1177/03009858221122591.

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Ranaviruses have been detected in over 12 families of reptiles including many genera of turtles, tortoises, and terrapins, but the pathogenesis of these infections is still poorly understood. Krefft’s river turtle hatchlings ( N = 36; Emydura macquarii krefftii) were inoculated intramuscularly with Bohle iridovirus (BIV, Ranavirus, isolate) or saline, and euthanized at 9 timepoints (3 infected and 1 control per timepoint) over a 24-day period. Samples of lung, liver, kidney, and spleen were collected for quantitative polymerase chain reaction (PCR); internal organs, skin, and oral cavity samples were fixed for histopathological examination. The earliest lesions, at 8 days postinoculation (dpi), were lymphocytic inflammation of the skin and fibrinoid necrosis of regional vessels at the site of inoculation, and mild ulcerative necrosis with lymphocytic and heterophilic inflammation in the oral, nasal, and tongue mucosae. Fibrinonecrotic foci with heterophilic inflammation were detected in spleen and gonads at 16 dpi. Multifocal hepatic necrosis, heterophilic inflammation, and occasional basophilic intracytoplasmic inclusion bodies were observed at 20 dpi, along with ulcerative lymphocytic and heterophilic tracheitis and bronchitis. Tracheitis, bronchitis, and rare bone marrow necrosis were present at 24 dpi. Of the viscera tested for ranaviral DNA by PCR, the liver and spleen had the highest viral loads throughout infection, and thus appeared to be major targets of viral replication. Testing of whole blood by qPCR was the most-effective ante-mortem method for detecting ranaviral infection compared with oral swabs. This study represents the first time-dependent pathogenesis study of a ranaviral infection in turtles.

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14

Glassman, Alan R., Kristi M. Gamblin, and Trevor T. Zachariah. "Comparison of Biochemistry Values from Plasma and Lymph in Krefft's River Turtles (Emydura macquarii krefftii)." Journal of Herpetological Medicine and Surgery 32, no. 1 (March 9, 2022). http://dx.doi.org/10.5818/jhms-d-20-00017.

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15

Wirth, Wytamma, Elizabeth Elliott, Donna Rudd, Linda Hayes, Alicia Maclaine, Narges Mashkour, Shamim Ahasan, Jakob Gorm Dahl, Kezia Drane, and Ellen Ariel. "Cutaneous Lesions in Freshwater Turtles (Emydura macquarii krefftii and Myuchelys latisternum) in a Rainforest Creek in North Queensland, Australia." Frontiers in Veterinary Science 7 (January 31, 2020). http://dx.doi.org/10.3389/fvets.2020.00033.

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16

Kuzmin, Yuriy, Vasyl Tkach, Scott Snyder, and Jeffrey Bell. "Camallanus Railliet et Henry, 1915 (Nematoda, Camallanidae) from Australian freshwater turtles with descriptions of two new species and molecular differentiation of known taxa." Acta Parasitologica 56, no. 2 (January 1, 2011). http://dx.doi.org/10.2478/s11686-011-0015-0.

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AbstractTwo new species of Camallanus are described from Australian freshwater turtles. Camallanus beveridgei sp. nov. is reported from Elseya dentata in Northern Territory. It differs from other species of the genus parasitic in turtles by several characters including the shape of the median ridge in the buccal capsule and the position of the anterior pair of caudal papillae in males. Camallanus sprenti sp. nov. is reported from Elseya latisternum (type host) and Emydura krefftii in northern Queensland. It is closely related to Camallanus tuckeri, and differs from the latter species in possessing a shorter oesophagus. We summarize data on morphology, distribution and specificity of 5 known Camallanus spp. from Australian turtles and provide a key for their identification. Sequence comparison of more than 500 base pairs at the 5′ end of the nuclear 28S rDNA gene confirms the status of C. sprenti and C. beveridgei as new species. Camallanus sprenti differs from the other 4 species of Camallanus from Australian turtles by 16–59 bases (3.1–11.5%) while C. beveridgei differed from the other 4 species by 23–60 bases (4.5–11.6%). Phylogenetic analysis demonstrates close interrelationships among C. tuckeri, C. sprenti and C. beveridgei, the three species with most similar buccal capsules.

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