Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
17
datasets available to search
ShareScore release 0.9.0
Dataset results
17 results for “Hellbender”
Figure 3. Hellbender sperm sampling. A in Zoo-based amphibian research and conservation breeding programs
Figure 3. Hellbender sperm sampling. A team led by Dale McGinnity, Nashville Zoo at Grassmere, Tennessee, USA, is creating the first genetically representative gene bank for any amphibian put forth using the hellbender (C. alleganiensis). Image by Sally Nofs.
Data from: Large-scale eDNA sampling and hierarchical modeling elucidates the importance of stream habitat for eastern hellbender (<em>Cryptobranchus a. alleganiensis</em>) occupancy and eDNA detection
Open the record for dataset details and reuse information.
Filial cannibalism leads to chronic nest failure of eastern hellbender salamanders (Cryptobranchus alleganienesis)
<p><span>These data and code support the results in our accompanying manuscript. In species that provide parental care, parents will sometimes cannibalize their own young. Here, we quantified the frequency of whole-clutch filial cannibalism in a species of giant salamander (eastern hellbender; <em>Cryptobranchus</em> <em>alleganienesis</em>) that has experienced precipitous population declines with unknown causes. We used underwater, artificial nesting shelters deployed across a gradient of upstream forest cover to assess the fates of 182 nests at 10 sites over 8 years. We found strong evidence that nest failure rates increased at sites with low riparian forest cover in the upstream catchment. At several sites, reproductive failure was 100%, mainly due to cannibalism by the caring male. The high incidence of filial cannibalism at degraded sites was not explained by evolutionary hypotheses for filial cannibalism based on adult body condition or low reproductive value of clutches. Instead, larger clutches at degraded sites were most vulnerable to cannibalism. We hypothesize that high frequencies of filial cannibalism of large clutches in areas with low forest cover could be related to changes in water chemistry or siltation that influence parental physiology or that reduce viability of eggs. Importantly, our results identify a possible mechanism contributing to population declines and observed geriatric age structure in this imperiled species.</span></p>
Filial cannibalism leads to chronic nest failure of eastern hellbender salamanders (Cryptobranchus alleganienesis)
Open the record for dataset details and reuse information.
FIG. 7 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 7. Hellbender neutrophil: lymphocyte ratio across 2017 and 2018 at Little River (LR; n ¼ 8), Tumbling Creek (TC; n ¼ 12), Hiwassee River (HR; n ¼ 11), Elk River (ER; n ¼ 3), North Fork Triplett Creek (NFTC; n ¼ 4), Little Buffalo River (LBR; n ¼ 4), Doe River (DR; n ¼ 1), and South Fork New River (SFNR; n ¼ 5). Letters indicate among-site differences, where sites that are significantly different have different letters, and error bars represent two standard deviations from the mean.
FIG. 5 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 5. Scatterplot showing regression between Hellbender neutrophil: lymphocyte ratio and water pH observed in 2018.
FIG. 4 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 4. Scatterplots showing multiple linear regression comparing Hellbender neutrophil: lymphocyte ratio and water characteristics for 2018. The first row of graphs depicts neutrophil: lymphocyte ratio on the y-axis and corresponding environmental variables on the x-axis; all other rows depict the relationship among water quality parameters assessed. R2 values are provided for each graph, the red line represents the overall trend line, and significant variables are indicated with an asterisk.
FIG. 3 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 3. Scatterplots showing regressions between Hellbender neutrophil: lymphocyte ratios and conductivity (A), pH (B), and dissolved oxygen (C), in 2017.
FIG. 1 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 1. Map of eight sites surveyed between 2017 and 2018 for Hellbenders, including North Fork Triplett Creek (NFTC) in Kentucky, Little Buffalo River (LBR), Hiwassee River (HR), Little River (LR), Doe River (DR), Tumbling Creek (TC), and Elk River (ER) in Tennessee, and South Fork New River (SFNR) in North Carolina.
FIG. 2 in Movement and Habitat Use of Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) Following Population Augmentation
FIG. 2.—(A) Mean size (±1 SE) of linear home ranges (LHR; [A]) and minimum convex polygon (MCP; [B]) home range size of resident (Res) and translocated (Trans) Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) at two sites in the Blue River in Indiana following population augmentation.
FIG. 4 in Movement and Habitat Use of Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) Following Population Augmentation
FIG. 4.—Mean probability (±1 SE) of artificial nest rock (ANR) use for wild resident adult, captive-reared translocated juvenile, and wild translocated adult Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) at two sites in the Blue River in Indiana.
FIG. 3 in Movement and Habitat Use of Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) Following Population Augmentation
FIG. 3.—Mean monthly linear home range size (±1 SE) of resident and translocated adult Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) at two sites in the Blue River in Indiana over four seasons following population augmentation.
Data from: Habitat attributes associated with short-term settlement of Ozark hellbender (Cryptobranchus alleganiensis bishopi) salamanders following translocation to the wild
1. Organisms associated with lotic systems rank among the most threatened because of global change. Although translocation is being increasingly applied as a conservation strategy, most studies have focused on survival and recruitment of individuals, and few have attempted to identify how habitat attributes influence short-term settlement of animals during the critical post-release period. 2. We demonstrate the application of resource selection modelling in an information theoretic framework to identify release-site characteristics that will increase the likelihood of settlement for a fully aquatic benthic stream salamander, the Ozark hellbender (Cryptobranchus alleganiensis bishopi). We fit discrete choice models using data from 29 radio-tagged hellbenders that were translocated to two sites in the North Fork of the White River (NFWR), Missouri (U.S.A.). We defined resource availability at two spatial scales (stream reach and home range) and quantified abiotic habitat attributes at 3181 salamander locations and 6329 random available locations collected between May 2008 and August 2009. 3. At both sites and spatial scales, a single model received substantially greater support (0.96–1.00 of total model weight) than all other models, and top-ranked models were similar in form and predictive ability. At both spatial scales, selection was positively influenced by the presence of cobble-boulder substratum relative to bedrock and finer substrata. We also noted a negative interactive effect between distance to the nearest substratum particle large enough to provide cover (i.e. at least one axis ≥15 cm in length) and an increase in either a direct or relative (i.e. pool, run, and riffle) measure of water velocity. 4. Collectively, salamanders released in our study selected resources indicative of long-term benthic microhabitat stability. However, despite strong selection of cobble-boulder substratum, 8% (282 of 3181) of captive-reared hellbender locations occurred in bank crevices and root masses. Although several studies have reported the importance of near bed hydraulics in determining occurrence of stream macroinvertebrates, our findings are the first to indicate that spacing among cobble-boulder substrata may be important for hellbenders. 5. To increase the likelihood of short-term settlement of captive-reared hellbenders in the wild, we recommend prioritising release sites where the average distance between cobble-boulder particles within habitat patches is minimised. In general, average spacing among cobble and boulder substrata should be <1 m in habitat patches where mean benthic water velocity exceeds 0.1 m s−1, and <0.5 m where water velocity approaches 0.30 m s−1. Based on home range sizes of captive-reared Ozark hellbenders, the collective extent of suitable cobble-boulder habitat patches within release sites should approximate at least 10 m2 per salamander released.
Data from: Habitat attributes associated with short-term settlement of Ozark hellbender (Cryptobranchus alleganiensis bishopi) salamanders following translocation to the wild
Open the record for dataset details and reuse information.
FIG. 6 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 6. Hellbender neutrophil: lymphocyte ratio in 2017 at Little River (LR; n ¼ 4), Tumbling Creek (TC; n ¼ 9), Hiwassee River (HR; n ¼ 6), Little Buffalo River (LBR; n ¼ 2), and Doe River (DR; n ¼ 1). Letters indicate among-site differences, where sites that are significantly different have different letters, and error bars represent two standard deviations from the mean.
FIG. 2 in Neutrophil: Lymphocyte Ratios as a Measure of Chronic Stress in Populations of the Hellbender (Cryptobranchus alleganiensis) across a Habitat Quality Gradient
FIG. 2. Scatterplots showing multiple linear regression comparing Hellbender neutrophil: lymphocyte ratio and water characteristics for 2017. The first row of graphs depicts neutrophil: lymphocyte ratio on the y-axis and corresponding environmental variables on the x-axis; all other rows depict the relationship among water quality parameters assessed. R2 values are provided for each graph, the red line represents the overall trend line, and significant variables are indicated with an asterisk.
FIG. 1 in Movement and Habitat Use of Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) Following Population Augmentation
FIG. 1.—Dispersal distances of Eastern Hellbenders (Crŋptobranchus alleganiensis alleganiensis) in the Blue River in Indiana. Zero represents the point of release, positive values reflect upstream movements, and negative values reflect downstream movements. (A) Resident and wild translocated subjects at Site 1; (B) resident and captive-reared translocated subjects at Site 2.
ScienceDex guides
Understand access before you commit
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.