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90 results for “Freshwater turtles”
Direct and indirect estimates of dispersal support strong juvenile philopatry and male-biased dispersal in a freshwater turtle species (Emys orbicularis)
<p><span>Dispersal has major impacts on population dynamics, population genetics and evolution and is also critical for population management and conservation. Dispersal is frequently sex- and age-specific, but current knowledge is strongly taxonomically biased toward birds and mammals. Here, we provide estimates of dispersal in a threatened freshwater turtle species, the European pond turtle <em>Emys</em> <em>orbicularis.</em> Based on 15 years of Capture-Mark-Recapture (CMR) monitoring and DNA samples from 194 individuals, we quantified both demographic and genetic dispersal between three sites separated by 1.5 to 3.5 km. We also investigated the effect of age and sex on dispersal. Overall, direct (CMR) and indirect (genetic) approaches provided consistent results showing that the studied sites are well connected with a flow of about one to three dozen migrants per generation. Dispersal was both age- and sex-biased in this species, with frequent dispersal of adult males and a strong philopatry of juveniles (of both sexes) and adult females. The strong philopatry of juveniles contrasts with the recurrent higher dispersal rate in young birds and mammals and shows the relevance of investigating dispersal in various taxonomic groups. Our results also provide useful information for the conservation of European pond turtle populations.</span></p>
Shell shape does not accurately predict self-righting ability in hatchling freshwater turtles
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Data from: Maternal diet influences fecundity in a freshwater turtle undergoing population decline
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Data from: Integrating ecological niche and hydrological connectivity models to assess the impacts of hydropower plants on an endemic and imperiled freshwater turtle
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Data from: Altered spring phenology of North American freshwater turtles and the importance of representative populations
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Direct and indirect estimates of dispersal support strong juvenile philopatry and male-biased dispersal in a freshwater turtle species (Emys orbicularis)
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Data from: The latest freshwater giants: a new Peltocephalus (Pleurodira: Podocnemididae) turtle from the Late Pleistocene of the Brazilian Amazon
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Data from: Description of a new species of Hedruris Nitzsch, 1821 (Nematoda, Hedruridae) from freshwater turtles in Argentina, with information on its life cycle and a review of the genus's host and geographic distribution
Hedruris dratini n. sp. (Nematoda, Hedruridae) is described from freshwater turtles in Argentina and information about its life cycle provided. The new species differs from the remaining species of the genus by possessing an excretory pore, and the nerve ring and deirids being positioned at equal distance from the anterior end. Additionally, H. dratini n. sp. has mammilated eggs and males possess nine pairs of caudal papillae. The first life cycle within the genus including an amphipod as intermediate host and a reptile as a definitive host is presented. Furthermore, the host and geographic distribution of species of the genus Hedruris Nitzsch, 1821 are analyzed. Although the genus has a cosmopolitan distribution and parasitizes a great diversity of hosts, the majority of its species follow a Gondwanian distribution and its preferred hosts are amphibians.
Data from: Phylogeography of the Australian freshwater turtle Chelodina expansa reveals complex relationships among inland and coastal bioregions
We examined range-wide mitochondrial phylogeographic structure in the riverine freshwater turtle Chelodina expansa to determine if this species exhibits deep genetic divergence between coastal and inland hydrological provinces as seen in co-distributed freshwater taxa. We sequenced two mitochondrial loci, genealogical relationships were assessed using a network approach, and relationships among biogeographic regions were tested using analyses of molecular variance. Population history was evaluated using neutrality tests, indices of demographic expansion, and mismatch analyses. Twenty one haplotypes were recovered across two mitochondrial haplogroups separated by ca 4% nucleotide divergence. The haplogroups have discrete geographic boundaries but only partially support a hypothesis of deep divergence between coastal and inland bioregions. The first haplogroup comprises populations from the inland Murray-Darling Basin and from coastal catchments south of the Mary River in southeast Queensland. The second haplogroup comprises populations from coastal catchments north of the Mary River. Cryptic phylogeographic barriers separating adjacent coastal populations are congruent with those demonstrated for other freshwater taxa and may result from the combined influences of the Conondale Range and alluvial deposits at the mouth of the Mary River. Our study demonstrates that freshwater taxa commonly display genetic differentiation within a biogeographic region where no boundaries have been recognised, highlighting the need to uncover cryptic microbiogeographic regions to aid conservation of freshwater biota.
FIGURE 2 in Myuchelys gen. nov. — a new genus for Elseya latisternum and related forms of Australian freshwater turtle (Testudines: Pleurodira: Chelidae)
FIGURE 2. Dorsal and lateral views of the skulls of A. Elseya dentata (UC0302); B. Myuchelys latisternum (AM 125475) and C. Emydura macquarii (QM48034).
FIGURE 1 in Myuchelys gen. nov. — a new genus for Elseya latisternum and related forms of Australian freshwater turtle (Testudines: Pleurodira: Chelidae)
FIGURE 1. Ventral view of the skulls of A. Elseya dentata (UC0302); B. Myuchelys latisternum (AM 125475) and C. Emydura macquarii (QM48034). Note the alveolar ridge on the maxillary surface of Elseya dentata.
FIGURE 3. A in Myuchelys gen. nov. — a new genus for Elseya latisternum and related forms of Australian freshwater turtle (Testudines: Pleurodira: Chelidae)
FIGURE 3. A phylogeny for the extant genera of the Australian short-necked Chelidae generated using PAUP* (v64d) as the single most parsimonious tree from the character data presented in Table 1. Values on the branches are bootstrap percentages—nodes for which values exceed 70% are considered robust. Phyrnops was used as the outgroup taxon. Note that the genus Elseya, as defined prior to this paper (i.e. Elseya + Myuchelys), was clearly paraphyletic.
FIGURE 3. Neopolystoma moleri n in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 3. Neopolystoma moleri n. sp. A, marginal hooklets 1 from the holotype and paratypes; B, marginal hooklets 2-8 from the holotype and paratypes. Scale-bars: 10µm.
FIGURE 2. Neopolystoma moleri n in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 2. Neopolystoma moleri n. sp. Ventral view of holotype; the dotted line indicates the outline of the vitellarium. Abbreviations: gb, genital bulb; gi, genito-intestinal canal; hp, haptor; ic, intestinal caecum; mo, mouth; ov, ovary; ph, pharynx; su, sucker; te, testis; vd, vas deferens; vg, vagina; vi, vitellaria; vt, vitelline duct. Scale bar: 1 mm.
FIGURE 5. Neopolystoma grossi n in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 5. Neopolystoma grossi n. sp. Ventral view of the holotype; the dotted line indicates the outline of the vitelline system. Abbreviations: eg, egg; gb, genital bulb; gi, genito-intestinal canal; hp, haptor; ic, intestinal caecum; mo, mouth; ov, ovary; ph, pharynx; su, sucker; te, testis; vd, vas deferens; vg, vagina; vi, vitellarium; vt, vitelline duct. Scale bar: 1mm.
FIGURE 7 in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 7. Paratypes of Neopolystoma grossi n. sp., demonstrating its ability to stretch. Scale bar: 1mm.
FIGURE 6. Neopolystoma grossi n in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 6. Neopolystoma grossi n. sp. A, marginal hooklets 1 from holotype and paratypes; B, marginal hooklets 2-8 from holotype and paratypes. Scale-bars: 10µm.
FIGURE 1 in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 1. Scatter diagram of a × c plotted against b × c for the two known North-American eye polystomes as well as the new species Neopolystoma grossi n. sp. and Neopolystoma moleri n. sp. The ellipses represent 90% of the confidence interval about the mean.
FIGURE 4 in Two new polystomes (Monogenea: Polystomatidae) from the eyes of North American freshwater turtles
FIGURE 4. Paratypes of Neopolystoma moleri n. sp., demonstrating its ability to stretch lengthwise in order to feed successfully without being dislodged. Scale bar: 1mm.
FIGURE 5 in A new species of freshwater turtle of the genus Elseya (Testudinata: Pleurodira: Chelidae) from the Northern Territory of Australia
FIGURE 5. Lateral, Dorsal and Ventral views of the skull of Elseya flaviventralis. See Thomson et al. 2015; 2006 for comparative skulls of other Elseya species.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.