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24 results for “Trachemys scripta”
Figure 1 in Helminth fauna of the invasive American red-eared slider Trachemys scripta in eastern Spain: potential implications for the conservation of native terrapins
Figure 1. Sampling localities of the American red-eared slider, Trachemys scripta in eastern Spain. (A) Protected wetland 'Marjal de Peñíscola'; (B) 'Cabanes-Torreblanca' Natural Park; (C) Protected Landscape 'Desembocadura del Mijares'; (D) Protected wetland 'Marjal de Gandía'; (E) Site of Community Importance 'Marjal de La Safor'.
Data and script files: Gene expression in response to estrone sulfate in Trachemys scripta
<p>Variation in developmental conditions can affect a variety of embryonic processes and shape a number of phenotypic characteristics that can affect offspring throughout their lives. This is particularly true of oviparous species where development typically occurs outside of the female, and studies have shown that traits such as survival and behavior can be altered by both temperature and exposure to steroid hormones during development. In species with temperature-dependent sex determination (TSD), the fate of gonadal development can be affected by temperature and by maternal estrogens present in the egg at oviposition and there is evidence that these factors can affect gene expression patterns. Here, we explore how thermal fluctuations and exposure to an estrogen metabolite, estrone sulfate, affect the expression of several genes known to be involved in sexual differentiation; <em>Kdm6b, Dmrt1, Sox9, FoxL2, </em>and <em>Cyp19A1</em>. We found that most of the genes responded to both temperature and estrone sulfate exposure, but that the responses to these factors was not identical in that estrone sulfate effects occur downstream of temperature effects. Our findings demonstrate that conjugated hormones such as estrone sulfate are capable of influencing temperature dependent pathways to potentially alter how embryos respond to temperature and highlight the importance of studying the interaction of maternal hormone and temperature effects.</p>
Figure 2 in Pets or predators? climate change and invasion risk of red-eared slider (Trachemys scripta elgans)
Figure 2. PCA-env for native and Indian climate for Trachemys scripta elegans. A) The green polygon represents nice unfilling, the blue polygon represents niche overlap, and the red polygon denotes nice expansion. The arrow indicates the niche centroid change. B) The correlation circle shows the relative contribution of different variables. C) and D) represent niche similarity and equivalency.
Figure 1 in Pets or predators? climate change and invasion risk of red-eared slider (Trachemys scripta elgans)
Figure 1. Predicted potential distribution of Trachemys scripta elegans under current and two future climate change scenarios.
Figure 3 in Pets or predators? climate change and invasion risk of red-eared slider (Trachemys scripta elgans)
Figure 3. Map showing species richness of native freshwater turtles at the sub-basin level in India.
Data and script files: Gene expression in response to estrone sulfate in Trachemys scripta
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Data from: Keep numbers in view: Red-eared sliders (Trachemys scripta elegans) learn to discriminate relative quantities
<p><span>The ability to discriminate relative quantities, one of the numerical competences, is considered as an adaptive trait in uncertain environments. Besides humans, previous studies have reported this capacity in several non-human primates and birds.</span><span> Here, we test whether red-eared sliders (<em>Trachemys scripta elegans</em>) can </span><span>discriminate different relative quantities</span><span>. Subjects were first trained to distinguish different stimuli with food reward. Then, they were tested with novel stimuli pairs to demonstrate how they distinguished the stimuli. The r</span><span>esults show that most subjects can complete the initial training and use relative quantity rather than absolute quantity to make choices during testing phase. This study provides behavioural evidence of relative quantity</span> <span>discrimination in a reptile species, and suggests that such capacity may be widespread among vertebrates.</span></p>
Data from: Keep numbers in view: Red-eared sliders (Trachemys scripta elegans) learn to discriminate relative quantities
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FIGURE 2 in A quarter millenium of uses and misuses of the turtle name Testudo scabra: Identification of the type specimens of T. scabra Linnaeus 1758 (= Rhinoclemmys punctularia) and T. scripta Thunberg in Schoepff 1792 (= Trachemys scripta scripta)
FIGURE 2. Illustration from Lacépède (1788:161, pl. 10), showing his specimen of "La Raboteuse" referred to Testudo scabra L. This appears to show a specimen of Rhinoclemmys punctularia.
FIGURE 1 in A quarter millenium of uses and misuses of the turtle name Testudo scabra: Identification of the type specimens of T. scabra Linnaeus 1758 (= Rhinoclemmys punctularia) and T. scripta Thunberg in Schoepff 1792 (= Trachemys scripta scripta)
FIGURE 1. Illustrations from Seba (1734: pl. 79, figs. 1 and 2), showing his Testudo terrestris amboinensis major, later synonymized by Linnaeus (1766) under his concept of Testudo scabra. This appears to show a very young specimen of Melanochelys trijuga trijuga or Melanochelys trijuga thermalis.
FIGURE 7 in A quarter millenium of uses and misuses of the turtle name Testudo scabra: Identification of the type specimens of T. scabra Linnaeus 1758 (= Rhinoclemmys punctularia) and T. scripta Thunberg in Schoepff 1792 (= Trachemys scripta scripta)
FIGURE 7. Type specimen (holotype) of Testudo scripta Thunberg in Schoepff 1792, donated by Thunberg between ca. 1785–92 to the Uppsala University Museum of Zoology (now catalogued as UUZM Types 7455), dried hatchling, ca. 31 mm straight CL. The original tag by Thunberg reads "Testudo scripta. Mus. Thunb." This specimen represents Trachemys scripta scripta.
FIGURE 4 in A quarter millenium of uses and misuses of the turtle name Testudo scabra: Identification of the type specimens of T. scabra Linnaeus 1758 (= Rhinoclemmys punctularia) and T. scripta Thunberg in Schoepff 1792 (= Trachemys scripta scripta)
FIGURE 4. Illustration from Schoepff (1792: pl. 3, figs. 4–5), showing the holotype of Testudo scripta Thunberg in Schoepff 1792 (also Testudo scabra L. sensu Thunberg in Schoepff) (presently Trachemys scripta scripta). On the plate these figures are labeled "Test. scripta Thunb." and the specimen is clearly a hatchling. The specimen itself was originally catalogued as Testudo scripta by Thunberg sometime between 1785 and 1792 and donated by him to the Uppsala University Museum of Zoology, and it is still there as a badly dried and misshaped specimen now catalogued as UUZM Types 7455 (see Fig. 7).
FIGURE 3 in A quarter millenium of uses and misuses of the turtle name Testudo scabra: Identification of the type specimens of T. scabra Linnaeus 1758 (= Rhinoclemmys punctularia) and T. scripta Thunberg in Schoepff 1792 (= Trachemys scripta scripta)
FIGURE 3. Illustration from Schoepff (1792: pl. 3, f. 1), showing the specimen of Testudo scabra L. sensu Retzius that he re-named as the new species Testudo galeata (later Pelomedusa galeata, currently a subjective synonym of Pelomedusa subrufa). The specimen in this drawing is the holotype of Testudo galeata Schoepff 1792.
Trachemys scripta gene expression data under constant and fluctuating incubation temperatures
<p>There is ample research demonstrating that temperature can have complex effects on biological processes, including the timing of when organisms respond to temperature; some responses occur rapidly while others require an extended exposure time. However, most of what we know about temperature effects comes from studies using constant temperature conditions, which are not reflective of natural, fluctuating temperatures. Species with temperature-dependent sex determination (TSD) present an ideal system to study the temporal aspects of the temperature response because prior research has established a number of temperature-responsive genes involved in TSD, albeit under constant temperatures. To investigate potential differences in the timing of sexual development between constant and fluctuating incubation temperatures, we exposed <em>Trachemys scripta</em> embryos to two conditions that produce males (constant 26°C and 26 ± 3°C) and two that produce females (constant 31°C and 31 ± 3°C), and sampled embryonic gonads for gene expression analysis via qPCR.We analyzed three genes involved in testis differentiation (<em>Kdm6b</em>, <em>Dmrt1</em>, and <em>Sox9</em>) and two genes involved in ovary differentiation (<em>Foxl2</em> and <em>Cyp19A1</em>). Results show that <em>Kdm6b</em> expression was significantly lower under fluctuating temperatures compared to constant temperatures. <em>Foxl2 </em>and <em>Cyp19A1</em> expression were also lower under fluctuating temperatures, but not at all stages of development. These results suggest that constant temperatures caused increases in both <em>Foxl2</em> and <em>Cyp19A1</em> expression earlier (developmental stage 20) than fluctuating temperatures (stages 22 and 23). <em>Dmrt1</em> and <em>Sox9</em> expression did not differ between constant and fluctuating temperatures. These results highlight that not all genes in a temperature-dependent process respond to temperature in the same manner. Whether there are functional consequences of this variation remains to be determined.</p>
Figure 3 in Translating natural history into geographic space: a macroecological perspective on the North American Slider, Trachemys scripta (Reptilia, Cryptodira, Emydidae)
Figure 3. Trachemys scripta records (white dots) used for model training and the species' potential distribution according to a MAXENT Climate Envelope Model based on mean temperature of all 12 months as variables. Darker grey-scale suggests higher climatic suitability.
Figure 1 in Translating natural history into geographic space: a macroecological perspective on the North American Slider, Trachemys scripta (Reptilia, Cryptodira, Emydidae)
Figure 1. (A) Boxplots illustrating the variability of the monthly mean temperature at 377 distribution records within the native range of Trachemys scripta. Note that the variation is lowest during the incubation of eggs (June–August). Crosses indicate mean values, horizontal bars the upper and lower quartiles and the median. (B) Performance of monthly mean temperature observed at the Slider records in models computed with single variables (see text). Higher area under curve (AUC) values suggest that the respective model has a higher ability to distinguish climatic conditions at Slider records from random background.
Figure 2 in Translating natural history into geographic space: a macroecological perspective on the North American Slider, Trachemys scripta (Reptilia, Cryptodira, Emydidae)
Figure 2. MAXENT Climate Envelope Models computed using the mean temperature for each month as single variables. Darker grey-scale suggests higher climatic suitability (same scale as in Figure 3). Species records used for modelling are indicated by white dots.
Trachemys scripta gene expression data under constant and fluctuating incubation temperatures
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Figure 2 in Helminth fauna of the invasive American red-eared slider Trachemys scripta in eastern Spain: potential implications for the conservation of native terrapins
Figure 2. Parasites found in the American red-eared slider, Trachemys scripta in eastern Spain. (A) Telorchis solivagus; (B) Serpinema microcephalus (anterior part detail); (C) Neopolystoma orbiculare (immature); (D) Neopolystoma orbiculare (adult). Scale bars: A, B, D, 1 mm; C, 0.5 mm.
Circulating miRNome of Trachemys scripta after elective gonadectomy
GEO Series GSE175466. Trachemys scripta. 24 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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