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1

Madison, Joseph D., Madeline M. Butterfield, Drew R. Davis, and Jacob L. Kerby. "Spatial Variation of False Map Turtle (Graptemys pseudogeographica) Bacterial Microbiota in the Lower Missouri River, United States." Journal of Herpetology 56, no. 2 (2022): 258–65. https://doi.org/10.1670/20-100.

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Madison, Joseph D., Butterfield, Madeline M., Davis, Drew R., Kerby, Jacob L. (2022): Spatial Variation of False Map Turtle (Graptemys pseudogeographica) Bacterial Microbiota in the Lower Missouri River, United States. Journal of Herpetology (Weinheim an der Bergstrasse, Germany) 56 (2): 258-265, DOI: 10.1670/20-100, URL: http://dx.doi.org/10.1670/20-100
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2

Wallace, James E., Zachary W. Fratto, and Valerie A. Barko. "A Comparison of Three Sampling Gears for Capturing Aquatic Turtles in Missouri: The Environmental Variables Related to Species Richness and Diversity." Transactions of the Missouri Academy of Science 41, no. 2007 (2007): 7–13. http://dx.doi.org/10.30956/0544-540x-41.2007.7.

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Donaldson Point Conservation Area (DPCA) is a lentic area within the Mississippi River floodplain that experiences seasonal flooding because of direct connectivity to the Mississippi River. Sampling for aquatic turtles was conducted during fall (October–November 2003) and spring (April–May 2004) using fyke nets, hoop nets and basking traps in both round and linear pools. Hoop nets were deployed with and without the use of leads, whereas paired fyke nets were positioned with their leads tied together or straight from the bank. The performance of each net and the turtle species captured were assessed. Catch-per-unit effort (CPUE) when using hoop nets and fyke nets was considerably greater in fall than in spring. Fyke nets set perpendicular to the bank produced a CPUE greater than did the other gears deployed in the spring and fall. We captured eight turtle species: Trachemys scripta elegans, Graptemys pseudogeographica pseudogeographica, Alapone muticus muticus, Alapone spinifer spinifer, Sternotherus odoratus, Graptemys ouachitensis, Chrysemys picta dorsalis and Chelydra serpentina serpentina. Species richness was greater in areas with deeper water with low transparency, and lower in water with high dissolved oxygen and with greater depth of hoop net deployment. Species abundance was the lowest when hoop nets were deployed in linear water bodies with high turbidity, lower pH and low dissolved oxygen. Because turtle species are important biotic components of large river communities, protecting floodplain aquatic habitats such as those found within DPCA may help sustain large river turtle assemblages.
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3

MCROBERT, SCOTT, JULIE KLEINOT, COURTNEY PARKS, and LORA MENGLE DVM. "Treatment of dystocia in a captive false map turtle Graptemys pseudogeographica." Herpetological Bulletin, no. 165 (September 1, 2023): 31. http://dx.doi.org/10.33256/hb165.31.

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4

Vogt, Richard C. "Systematics of the false map turtles (Graptemys pseudogeographica compex: Reptilia, Testudines, Emydidae)." Annals of the Carnegie Museum 62, no. 1 (1993): 1–46. http://dx.doi.org/10.5962/p.219620.

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5

Vogt, Richard C. "Systematics of the false map turtles (Graptemys pseudogeographica compex: Reptilia, Testudines, Emydidae)." Annals of the Carnegie Museum 62 (February 25, 1993): 1–46. https://doi.org/10.5281/zenodo.13656652.

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6

Ewert, Michael, John Phillips, Cory Etchberger, and Craig Nelson. "Carbon dioxide influences environmental sex determination in two species of turtles." Amphibia-Reptilia 23, no. 2 (2002): 169–75. http://dx.doi.org/10.1163/156853802760061813.

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AbstractEggs of wild caught Trachemys scripta and Graptemys pseudogeographica kohnii, two emydine turtles known to have temperature-dependent sex determination, were incubated at 28.5°C in boxes aerated with one of four gas mixtures (two in G. p. kohnii). Across all eggs, elevated levels of carbon dioxide significantly feminized sex ratios in both species and also reduced hatching success. When eggs were grouped into clutches, all comparisons between 0% and elevated carbon dioxide showed feminization in the portions of the clutches at elevated carbon dioxide, a statistically significant result for T. scripta. Accumulation of biogenic carbon dioxide from embryonic respiration and other sources is thus likely to affect sex ratios in natural nests under some conditions, perhaps through an effect on some aspects of embryonic pH.
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7

Seburn, David, and Mackenzie Burns. "Distribution and breeding potential of the exotic False Map Turtle (<i>Graptemys pseudogeographica</i>) in Canada." Canadian Field-Naturalist 138, no. 1 (2025): 39–45. https://doi.org/10.22621/cfn.v138i1.3217.

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False Map Turtle (Graptemys pseudogeographica) is widespread in the central United States, and its native range extends close to the Canadian border. It is common in the pet trade and has been released into the wild outside its native range. We examined observations of False Map Turtle from iNaturalist Canada, an online platform to document native and non-native species, and confirmed 20 observations in Canada from eight cities in three provinces. The earliest observation was in April 2014 from Victoria, British Columbia. Fourteen of the 20 observations (70%) were from 2020 to February 2024. All the turtles were either large juveniles or adults. Climate data from the northern part of the False Map Turtle’s native range and from Canadian cities suggest that individuals could survive the winter in parts of southern Canada and successfully breed in parts of southern Ontario during the warmest years.
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8

Kiesow, Alyssa M., and Ambra Warcken. "Characterization and Isolation of Ten Microsatellite Loci in False Map Turtles, Graptemys pseudogeographica (Emydidae, Testudines)." American Midland Naturalist 177, no. 2 (2017): 327–32. http://dx.doi.org/10.1674/0003-0031-177.2.327.

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9

Tietz, Benno, Johannes Penner, and Melita Vamberger. "Chelonian challenge: three alien species from North America are moving their reproductive boundaries in Central Europe." NeoBiota 82 (February 1, 2023): 1–21. http://dx.doi.org/10.3897/neobiota.82.87264.

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Biological invasions by alien species have substantial economic impacts and are a major driver of the ongoing decline and loss of biodiversity. Through humans, the North American pond slider (Trachemys scripta) has acquired a global distribution over the last decades and is currently listed among the worst invasive reptile species. However, in more recent times, other freshwater chelonian species have increasingly been recorded far outside their native distribution ranges as well, not only on the same continent but also on others. Despite that, the impact of alien chelonians on their respective new ecosystems remains unclear. The long-term effects and severity of impacts of alien populations mostly depend on whether they ultimately succeed in establishing themselves. This is not entirely resolved for chelonians in Central Europe. To answer that, we investigated wild populations of three non-native chelonian species from North America in Germany (Pseudemys concinna, Graptemys pseudogeographica and Trachemys scripta) applying population genetic approaches. We revealed the successful reproduction of all three species in Germany and provide the very first record for the reproduction of P. concinna and G. pseudogeographica in a temperate continental climate zone outside their native distribution. Based on our unambiguous evidence of natural reproduction, we call for dedicated studies to verify how widespread established populations are and to investigate the existing and potential impacts of all three species in a range of ecosystems along a climatic gradient. Such data is urgently needed to revise the current risk assessments of non-native chelonians, especially in Central European countries.
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10

Tietz, Benno, Johannes Penner, and Melita Vamberger. "Chelonian challenge: three alien species from North America are moving their reproductive boundaries in Central Europe." NeoBiota 82 (February 1, 2023): 1–21. https://doi.org/10.3897/neobiota.82.87264.

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Biological invasions by alien species have substantial economic impacts and are a major driver of the ongoing decline and loss of biodiversity. Through humans, the North American pond slider (Trachemys scripta) has acquired a global distribution over the last decades and is currently listed among the worst invasive reptile species. However, in more recent times, other freshwater chelonian species have increasingly been recorded far outside their native distribution ranges as well, not only on the same continent but also on others. Despite that, the impact of alien chelonians on their respective new ecosystems remains unclear. The long-term effects and severity of impacts of alien populations mostly depend on whether they ultimately succeed in establishing themselves. This is not entirely resolved for chelonians in Central Europe. To answer that, we investigated wild populations of three non-native chelonian species from North America in Germany (Pseudemys concinna, Graptemys pseudogeographica and Trachemys scripta) applying population genetic approaches. We revealed the successful reproduction of all three species in Germany and provide the very first record for the reproduction of P. concinna and G. pseudogeographica in a temperate continental climate zone outside their native distribution. Based on our unambiguous evidence of natural reproduction, we call for dedicated studies to verify how widespread established populations are and to investigate the existing and potential impacts of all three species in a range of ecosystems along a climatic gradient. Such data is urgently needed to revise the current risk assessments of non-native chelonians, especially in Central European countries.
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11

Danielson, Sharon C., and Christopher A. Sheil. "Patterns of chondrification and ossification in the skull of Graptemys pseudogeographica , the false map turtle (Emydidae)." Journal of Morphology 278, no. 12 (2017): 1739–53. http://dx.doi.org/10.1002/jmor.20747.

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12

Lindeman, Peter V. "Resource use of five sympatric turtle species: effects of competition, phylogeny, and morphology." Canadian Journal of Zoology 78, no. 6 (2000): 992–1008. http://dx.doi.org/10.1139/z00-013.

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I quantified resource use with respect to habitat, diet, and diel and seasonal use of basking time for five sympatric turtle species in a cove on Kentucky Lake, an impoundment of the lower Tennessee River in western Kentucky, U.S.A. I used pseudocommunity analyses to test for significant structure in resource use, compared resource-use matrices with matrices representing phylogenetic similarity, and measured morphological characteristics related to resource use. Three strictly riverine species (Graptemys pseudogeographica, Graptemys ouachitensis, and Apalone mutica) with relatively long limbs and digits used outer portions of the cove near deeper waters to a greater extent than did two shorter-limbed species (Trachemys scripta and Pseudemys concinna), which inhabit both lotic and lentic waters. Only the difference in habitat between A. mutica and the other four species was shown to be significant in pseudocommunity analysis, a result that can be better explained by differences in basking substrates than by competition. Dietary studies indicated two guilds, omnivore and algivore, in spite of the low pairwise overlap values that resulted from overall prey diversity. Analysis of use of diel and seasonal basking time revealed significant structure (partitioning) at only the rank of second-nearest neighbor for seasonal time. Clustering phenograms for resource similarity among the five species were overall highly similar to two phylogenetic hypotheses. Phylogeny was thus shown to be of greater importance in structuring resource use in Kentucky Lake than interspecific competition. In addition, the similarity in clustering phenograms was not consistent with the hypothesis of niche complementarity, suggesting that interspecific competition was of little importance.
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13

Koo, Kyo Soung, Soorim Song, Jae Hyeok Choi, and Ha-Cheol Sung. "Current Distribution and Status of Non-Native Freshwater Turtles in the Wild, Republic of Korea." Sustainability 12, no. 10 (2020): 4042. http://dx.doi.org/10.3390/su12104042.

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Globally, an increase in the transportation and expansion of the pet market is the most important cause of the invasion of non-native species. Invasion of non-native species disturbs native ecosystems and leads to socio-economic problems. The pet trade involving turtles has been globally recognized as the route through which non-native species enter ecosystems. As a result, the invasion of non-native turtles worldwide is causing problems such as competition, predation, transmission of parasites, and hybridization with native turtles. Every year, both the number of non-native turtles imported as pets in the Republic of Korea and the number of introduced species found in the wild is increasing. However, the current status of non-native turtles in the wild is not well known, posing major challenges to their management. In this study, we aimed to determine the current status of non-native turtles introduced into the wild in Korea. We analyzed the factors associated with the detection and distribution of non-native turtles. In total, 1587 of non-native turtles (three families, six genera, and 13 species including subspecies) were found in 648 sites in Korea: Chelydra serpentina, Mauremys sinensis, Chrysemys picta bellii, Graptemys ouachitensis, G. pseudogeographica pseudogeographica, G. p. kohni, Pseudemys concinna, P. nelsoni, P. peninsularis, P. rubriventris, Trachemys scripta elegans, T. s. scripta, and T. s. troostii. There was relationship between the distribution of non-native turtles and environmental factors such as precipitation and temperature. Moreover, human factors such as number of human populations and size of region were significantly related with the distribution and number of non-native turtles. In conclusion, it is likely that human factors are associated with the influx of invasive turtles to the natural habitat, while the possibility of survival and adaption for the turtles is associated mainly with environmental factors. Our result will be an essential guideline not only for understanding the current status of non-native turtles in Korea, but also for establishing strategies for management and control.
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14

Lancaster, Kelsey, Stanley E. Trauth, and Kevin M. Gribbins. "Testicular histology and germ cell cytology during spermatogenesis in the Mississippi map turtle,Graptemys pseudogeographica kohnii, from Northeast Arkansas." Spermatogenesis 4, no. 3 (2014): e992654. http://dx.doi.org/10.4161/21565562.2014.992654.

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15

DonnerWright, Deahn M., Michael A. Bozek, John R. Probst, and Eric M. Anderson. "Responses of turtle assemblage to environmental gradients in the St. Croix River in Minnesota and Wisconsin, U.S.A." Canadian Journal of Zoology 77, no. 6 (1999): 989–1000. http://dx.doi.org/10.1139/z99-068.

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We investigated how environmental gradients measured along the St. Croix River in Minnesota and Wisconsin, U.S.A., influenced the turtle assemblage. Among seven species, the five most common species were generalists and had wide distributions throughout the study area. However, patterns in assemblage structure were related to environmental gradients along the river. Sex ratios were male-dominated for the five most common species, and few or no juveniles were captured during the study. The first two canonical axes of a canonical correspondence analysis accounted for 92.7% of the variation in species-environment gradients. Most of the variation in distribution and abundance was attributed to gradients in channel morphology and physical characteristics along the river channel. Abundances of common snapping (Chelydra serpentina), false map (Graptemys pseudogeographica), and painted (Chrysemys picta bellii) turtles were associated with muck substrates and the number of basking sites (i.e., snags, rocks), which increased farther downstream. Abundance of spiny softshell turtles was closely related to increased water velocity and depth, which were related to hydraulic control points in the river. Abundance of common map turtles was associated with the presence of open sandy areas, uniform channel bottom, and gravel substrates. Geomorphic changes along the St. Croix River clearly influence the turtle assemblage and these specific relations should be considered in efforts to preserve and restore components of the assemblage.
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16

Glorioso, Brad M., Allison J. Vaughn, and J. Hardin Waddle. "The Aquatic Turtle Assemblage Inhabiting a Highly Altered Landscape in Southeast Missouri." Journal of Fish and Wildlife Management 1, no. 2 (2010): 161–68. http://dx.doi.org/10.3996/072010-jfwm-020.

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Abstract Turtles are linked to energetic food webs as both consumers of plants and animals and prey for many species. Turtle biomass in freshwater systems can be an order of magnitude greater than that of endotherms. Therefore, declines in freshwater turtle populations can change energy transfer in freshwater systems. Here we report on a mark–recapture study at a lake and adjacent borrow pit in a relict tract of bottomland hardwood forest in the Mississippi River floodplain in southeast Missouri, which was designed to gather baseline data, including sex ratio, size structure, and population size, density, and biomass, for the freshwater turtle population. Using a variety of capture methods, we captured seven species of freshwater turtles (snapping turtle Chelydra serpentina; red-eared slider Trachemys scripta; southern painted turtle Chrysemys dorsalis; river cooter Pseudemys concinna; false map turtle Graptemys pseudogeographica; eastern musk turtle Sternotherus odoratus; spiny softshell Apalone spinifera) comprising four families (Chelydridae, Emydidae, Kinosternidae, Trinoychidae). With the exception of red-eared sliders, nearly all individuals captured were adults. Most turtles were captured by baited hoop-nets, and this was the only capture method that caught all seven species. The unbaited fyke net was very successful in the borrow pit, but only captured four of the seven species. Basking traps and deep-water crawfish nets had minimal success. Red-eared sliders had the greatest population estimate (2,675), density (205/ha), and biomass (178 kg/ha). Two species exhibited a sex-ratio bias: snapping turtles C. serpentina in favor of males, and spiny softshells A. spinifera in favor of females.
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17

Romanova, Elena Borisovna, Irina Aleksandrovna Stolyarova, Andrey Gennadievich Bakiev, and Roman Andreevich Gorelov. "Comparative data on the blood leukocyte composition of semi-aquatic turtles from the Samara Zoo." Samara Journal of Science 13, no. 1 (2024): 44–53. http://dx.doi.org/10.55355/snv2024131106.

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The leukocyte blood count of 16 species of five families of semi-aquatic turtles from the Samara Zoo was determined. A comparison of the leukogram of representatives of two genera of the family Emydidae revealed a reduced proportion of heterophils and an increased proportion of basophils in Graptemys (G. pseudogeographica, G. nigrinoda) compared with Terrapene (T. triunguis, T. ornata). The leukocyte profile of Cuora mouhotii (Geoemydidae) was characterized by an increased content of heterophils, which showed a higher activation of innate immune responses. The most similar in leukocyte composition are the species of the Kinosternidae family of three genera: Kinosternon, Sternotherus and Staurotypus. The clade Trionychia (Trionychidae) differed from the clade Durocryptodira (Emydidae, Geoemydidae and Kinosternidae) by an increased number of heterophils and monocytes, and a low content of eosinophils. The Pleurodira suborder (Chelidae) differed from the Cryptodira suborder (Emydidae, Geoemydidae, Kinosternidae, Trionychidae) by an increased content of agranulocytes. Positive significant correlations of the length of the carapace with the content of heterophils and the values of leukocyte indices (index of the eosinophils and lymphocytes ratio, index of the heterophils and eosinophils ratio, index of the heterophils and lymphocytes ratio) reflecting the increased role of nonspecific resistance of the turtle organism during ontogenesis and negative significant correlations with the content of eosinophils were revealed. The index of the heterophils and lymphocytes ratio, which is an indicator of physiological stress, had the minimum value among the studied species in Sternotherus odoratus (Kinosternidae), the maximum value in C. mouhotii (Geoemydidae).
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18

"Graptemys pseudogeographica." CABI Compendium CABI Compendium (January 7, 2022). http://dx.doi.org/10.1079/cabicompendium.81761.

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19

Freedberg, Steven. "Long-Term Nest-Site Fidelity in the Mississippi Map Turtle, Graptemys pseudogeographica kohnii." Chelonian Conservation and Biology 19, no. 2 (2020). http://dx.doi.org/10.2744/ccb-1423.1.

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20

Smith, Haley, Stan Galicki, and Will Selman. "Three's Company: Observations of a Nonnative Map Turtle (Graptemys pseudogeographica) Occurring Syntopically with Two Endemic Graptemys in the Pearl River, Mississippi." Chelonian Conservation and Biology 19, no. 2 (2020). http://dx.doi.org/10.2744/ccb-1435.1.

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21

Madison, Joseph D., Madeline M. Butterfield, Drew R. Davis, and Jacob L. Kerby. "Spatial Variation of False Map Turtle (Graptemys pseudogeographica) Bacterial Microbiota in the Lower Missouri River, United States." Journal of Herpetology 56, no. 2 (2022). http://dx.doi.org/10.1670/20-100.

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