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609 results for “Critically endangered”
Fig. 4. - Capurodendron sahafariense L. Gaut. & Naciri. A in Three Critically Endangered new species of Capurodendron (Sapotaceae) from Madagascar
Fig. 4. - Capurodendron sahafariense L. Gaut. & Naciri. A. Longitudinal section of flower; B. Flower; C. Corolla opened seen from inside; D. Corolla opened seen from outside; E. Brachyblast with leaves and post-anthesis flower; F. Branch with flowers and fruit; G. Fruit; H. Transverse section of ovary. [Drawings: G. Loza]
Fig. 1. – Labramia ambondrombeensis L. Gaut. & Randriarisoa. A in Labramia ambondrombeensis (Sapotaceae), a Critically Endangered new species from Madagascar.
Fig. 1. – Labramia ambondrombeensis L. Gaut. & Randriarisoa. A. Flowering branch; B. Leaf with venation details (a: upper side; b: lower side); C. Flower; D. Flower in longitudinal section; E. Detached corolla spread opened (c: outer side, with appendages folded down and one lobe removed to show one lobe and one stamen; d: inner side, with two stamens removed to show inner side of lobes); F. Transversal section of the ovary. [Razakamalala et al. 1077, G] [Drawing: G. Loza]
Using species distribution models and decision tools to direct surveys and identify potential translocation sites for a critically endangered species
<p>Aim: Occurrence records for cryptic species are typically limited or highly uncertain, leaving their distributions poorly resolved and hampering conservation. This can apply to well‐studied species, and increased survey effort and/or novel methods are required to improve distribution data. Here, we paired species distribution modelling (SDM) with decision tools to direct surveys for the critically endangered Leadbeater's possum (Gymnobelideus leadbeateri) outside its current restricted range. We also assessed survey areas for their suitability to host translocations.</p> <p>Location: Victoria, Australia.</p> <p>Method: We used both recent and historic records (now out of range and spatially uncertain) of Leadbeater's possum to build SDMs using MaxEnt. The SDMs informed an initial multi‐criteria decision analysis (MCDA) that enabled prioritization of 80 survey sites across seven forest patches (13–145 km outside the known range), which we surveyed using camera traps. Site and vegetation data were used in a post‐survey MCDA to rank their potential translocation suitability.</p> <p>Results: The SDM predictions were consistent with the species' ecology, identifying cold areas with high rainfall that had not recently burnt as suitable. The spatial uncertainty of records did not exert a strong influence on either model predictions or the ranking of patches for surveys. Camera trap surveys yielded records of 19 native species, with Leadbeater's possum detected in only one survey patch, 13 km outside of its previously known range. The post‐survey MCDA identified three forest patches as potentially suitable for conservation translocations, and these priorities were not sensitive to the decision criteria used.</p> <p>Main conclusions: The approach outlined here prioritized survey effort over a large area, resulting in detection of Leadbeater's possum in one new patch. The potential translocation sites identified could present an important risk‐spreading measure for the species given the threat posed by bushfire. Combining SDMs and decision tools can help target surveys and guide subsequent conservation strategies.</p>
Figure 3 in Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon
Figure 3 Uvariopsis dicaprio. (A) habit, cauliflorous inflorescences on trunk; (B) leafy branch, one season's growth; (C) inflorescence, showing pedicel articulations, bracts and bracteoles; (D) flower, with one petal removed to show the staminal dome; (E) detail of sparse hairs on abaxial petal surface; (F) stamen, different views; (G) junction of base of leaf with stem, showing dome-like axillary bud. All drawn from MacKinnon 51 (K) by MEG GRIFFITHS. Full-size DOI: 10.7717/peerj.12614/fig-3
Figure 4 in Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon
Figure 4 Global distribution of Uvariopsis dicaprio, together with U. korupensis and U. submontana. Full-size DOI: 10.7717/peerj.12614/fig-4
Figure 1 in Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon
Figure 1 Uvariopsis dicaprio. Cauliflorous inflorescences on trunk. Photo Lorna MacKinnon. Full-size DOI: 10.7717/peerj.12614/fig-1
Figure 2 in Uvariopsis dicaprio (Annonaceae) a new tree species with notes on its pollination biology, and the Critically Endangered narrowly endemic plant species of the Ebo Forest, Cameroon
Figure 2 Uvariopsis dicaprio. Trunk apex with cauliflorous flowers and canopy. Photo Lorna MacKinnon. Full-size DOI: 10.7717/peerj.12614/fig-2
Figure 7 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 7 Pseudohydrosme ebo (A–D from van der Burgt 2377, K, YA; E from Morgan 25, K,YA). (A) Primary lateral division (one of three divisions) of leaf-blade, with petiole folded, behind; (B) seedling (probably in first year); (C) seedling plant (probably in third or later year); (D) seedling leaf-blade (pre-mature); ((E) obique view (B) and (F) from above); trilobed stigma. Drawn by Andrew Brown. Full-size DOI: 10.7717/peerj.10689/fig-7
Figure 3 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 3 Global distribution of the species of the African genus Pseudohydrosme. Red dot = P. buettneri; black dots= P.gabunensis (location not available for Congo specimen); blue dot = P. ebo. Full-size DOI: 10.7717/peerj.10689/fig-3
Figure 6 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 6 Pseudohydrosme ebo (van der Burgt 1888, K, YA). Drawing of flowering plant. ((A) ventral side view and (B) oblique side view) habit, rhizome and inflorescences; (C) inflorescence, longitudinal section, showing spadix from base to apex with sparse female flowers, partially naked axis of female zone, separated by naked axis from the densely flowered, male zone; (D) group of three stamens, ventral side view; (E) stamen; (F) stamen, transverse section; (G) female flower, entire, side view; (H) female flower, longitudinal section; (I) ovary, transverse section. Drawn by Andrew Brown. Full-size DOI: 10.7717/peerj.10689/fig-6
Figure 2 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 2 Pseudohydrosme ebo (van der Burgt 2377, K, YA). Photo of plant in leaf, in habitat, Ebo forest, December, 2019. Photo by Xander van der Burgt. Full-size DOI: 10.7717/peerj.10689/fig-2
Figure 5 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 5 Pseudohydrosme gabunensis. Photo of flowering, leafless plant cultivated at University of Vienna Botanic Garden (courtesy of David Prehsler). Full-size DOI: 10.7717/peerj.10689/fig-5
Figure 1 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 1 Pseudohydrosme ebo (van der Burgt 1888, K, YA). Photo of flowering, leafless plant at Ebo forest, October 2015. Photo by Xander van der Burgt. Full-size DOI: 10.7717/peerj.10689/fig-1
Figure 4 in Taxonomic revision of the threatened African genus Pseudohydrosme Engl. (Araceae), with P. ebo, a new, critically endangered species from Ebo, Cameroon
Figure 4 Pseudohydrosme buettneri (Buettner 519, B). Drawing of flowering plant. (A) Habit, rhizome and inflorescences; (B) spadix after removal of spathe showing from base to apex, female, male and staminodal flowers; (C and D) paired stamens, side view; (E) paired stamens flowers, transverse section; (F and G) staminodes, sterile male flower; (H) female flower, entire, side view; (J) female flower, longitudinal section. Reproduced from protologue, (Engler, 1892: taf. XVII). Drawn by Josef Pohl. Full-size DOI: 10.7717/peerj.10689/fig-4
Data for: Hematology and biochemistry of critically endangered radiated tortoises (Astrochelys radiata): reference intervals in previously confiscated subadults and variability based on common techniques
<p>Dataset for: Brenn-White M, Raphael BL, Rakotoarisoa NAT, Deem SL. 2022. Hematology and biochemistry of critically endangered radiated tortoises (<em>Astrochelys radiata</em>): reference intervals in previously confiscated subadults and variability based on common techniques. PLOS One.</p> <p>Dataset is contained in a.radiata_bloodwork.csv. Metadata and data definitions are contained in a.radiate_bloodwork_readme.txt.</p> <p>Dataset contains hematology and biochemistry values of 120 previously confiscated, clinically healthy subadult radiated tortoises living under human care within their native habitat at the Tortoise Conservation Center (TCC), Madagascar. To evaluate the effects of different commonly used techniques on these parameters, we compared results between two venipuncture sites (subcarapacial sinus and brachial vein) and three different WBC quantification methods (Natt and Herrick, Leukopet<sup>TM</sup>, and slide estimate). Data from tortoises removed from the final analyses due to sample quality issues are also included as frequency of sample quality issues varied by venipuncture site. See associated publication for detailed methods. </p> <p> </p>
Estimating the abundance of the critically endangered Baltic Proper harbour porpoise (Phocoena phocoena) population using passive acoustic monitoring
<p>Knowing the abundance of a population is a crucial component to assess its conservation status and develop effective conservation plans. For most cetaceans, abundance estimation is difficult given their cryptic and mobile nature, especially when the population is small and has a transnational distribution. In the Baltic Sea, the number of harbour porpoises (<i>Phocoena phocoena</i>) has collapsed since the mid-20<sup>th</sup> century and the Baltic Proper harbour porpoise is listed as Critically Endangered by the IUCN and HELCOM; however, its abundance remains unknown. Here, one of the largest ever passive acoustic monitoring studies was carried out by eight Baltic Sea nations to estimate the abundance of the Baltic Proper harbour porpoise for the first time. By logging porpoise echolocation signals at 298 stations during May 2011-April 2013, calibrating the loggers' spatial detection performance at sea, and measuring the click rate of tagged individuals, we estimated an abundance of 71-1,105 individuals (95% CI, point estimate 491) during May-October within the population's proposed management border. The small abundance estimate strongly supports that the Baltic Proper harbour porpoise is facing an extremely high risk of extinction, and highlights the need for immediate and efficient conservation actions through international cooperation. It also provides a starting point in monitoring the trend of the population abundance to evaluate the effectiveness of management measures and determine its interactions with the larger neighbouring Belt Sea population. Further, we offer evidence that design-based passive acoustic monitoring can generate reliable estimates of the abundance of rare and cryptic animal populations across large spatial scales.</p>
Data from: A new population record of Critically Endangered Dipterocarpus bourdillonii Brandis from the Anamalai Tiger Reserve, Tamil Nadu
<p><strong>This dataset is based on the following manuscript/publication:</strong><br> Page, N., S. Kasinathan, K. Bhat, G. Moorthi, T. Sundarraj, Divya Mudappa, and T. R. S. Raman (2022). A new population record of Critically Endangered <em>Dipterocarpus bourdillonii</em> Brandis from the Anamalai Tiger Reserve, Tamil Nadu. <em>Journal of Threatened Taxa</em> 14(8): 21651–21659. https://doi.org/10.11609/jott.7860.14.8.21651-21659</p> <p>Please refer to the README.txt file included with the dataset for complete details and usage notes.</p> <p><strong>Geographic Coverage:</strong><br> Location/Study Area: Valparai Plateau, Tamil Nadu, India; Anamalai Tiger Reserve, Tamil Nadu, India<br> GPS coordinates: Valparai Plateau (0°15'- 10°22'N, 76°52'-76°59'E); Anamalai Tiger Reserve (10°12'-10°35'N, 76°49'-77°24'E)</p> <p><strong>Temporal Coverage:</strong><br> Begins: 2020-10-01 (Year, Month, Day)<br> Ends: 2022-05-31 (Year, Month, Day)</p> <p><strong>Funding:</strong><br> Fondation Franklinia<br> AMM Murugappa Chettiar Research Centre<br> Rohini Nilekani Philanthropies</p> <p><strong>Dataset:</strong></p> <p>The dataset includes 7 files: 1 text file (<strong>README.txt</strong>), 5 data files in comma-delimited format (CSV), and 1 KML file of seven survey routes. Details of content of each CSV data file are provided below. The following files are included:<br> <strong>README.txt:</strong> Usage notes and metadata related to the dataset<br> <strong>1_Surveys_ver2.csv:</strong> Details of trails covered where Dipterocarpus bourdillonii was recorded during the survey<br> <strong>2_Focal_tree_data_ver2.csv:</strong> Details of focal trees of Dipterocarpus bourdillonii<br> <strong>3_Tree_centred_PCQ_ver2.csv: </strong>Data from point-centred quarter (PCQ) plots sampled with focal trees at the centre<br> <strong>4_Plant_checklist_ver2.csv:</strong> Checklist of plants (mainly trees) recorded on survey trails<br> <strong>5_Seed_fruit_ver2.csv:</strong> Measurements of fruits and seeds of Dipterocarpus bourdillonii<br> <strong>06_Dipterocarpus_bourdillonii_survey_trails.kml:</strong> This file includes the GPS tracks of the seven survey trails in KML format.</p> <p>Details and data available in the columns in each of the above CSV files and the KML file are explained below.</p> <p><strong>1_Surveys_ver2.csv</strong><br> Column: Description<br> Date: Date on which the survey was done<br> Place: Name of the place where the focal tree is located. e.g., Candura, Manamboli, Iyerpadi etc<br> Route_description:Description of place or route covered<br> Trail: Name of the tree survey trail<br> Trail_distance: Distance covered on the trail in kilometres (km)<br> Track_filename_kml: Name of the file with GPS track of survey trail/route, where available, in KML format<br> Observers: Names of observers who took measurements and filled datasheet during survey<br> Remarks: Notes and additional information</p> <p><strong>2_Focal_tree_data_ver2.csv</strong><br> Column: Description<br> FT_ID: Unique numeric linking ID of each focal tree (NA for 3 individuals found in plots around other focal trees)<br> Species: Focal tree species<br> Date: Date on which the survey was done<br> Place: Name of forest range (Manamboli)<br> Waypoint: Unique location waypoint number for the focal tree and GPS instrument used<br> Time: Time when the focal tree's data was collected<br> Location: Landmark where the focal tree is located (NA, if not available)<br> Latitude: Latitude of the focal tree (decimal degrees N)<br> Longitude: Longitude of the focal tree (decimal degrees E)<br> Elevation: Elevation of the focal tree from sea-level in metres<br> Slope: Slope at focal tree location assessed with Clinometer, categorised as Flat, Gentle, Moderate, or Steep (NA, if not available)<br> ID_Notes: Any obvious signs with which to identify focal tree (NA, if not available)<br> Phenophase: Phenophase of the focal tree viz. leaf flush, buds/flowers, fruits (NA, if not available)<br> GBH: Girth of the focal tree in cm, at 1.3m from ground; measured from the higher side if tree is on slope<br> Tree_ht: Focal tree's height in m (NA, if not available)<br> Canopy_ht: Height of canopy in m where the focal tree is located (NA, if not available)<br> Substrate: Substrate where focal tree is standing viz. Earth, Rock, Streamside, Other (NA, if not available)<br> Invasives: List of invasive plant species present within 5 m radius around the focal tree (NA, if not available)<br> Stature: Stature of the focal tree relative to its surroundings (NOT of the species in general) categorised as Understorey, Mid, Canopy, Emergent (NA, if not available)<br> Relatively: Relative height of focal tree in relation to other trees within 10 m radius categorised as Shorter than most, Taller than most, Same height as most (NA, if not available)<br> Deadwood: Estimated percentage of deadwood present on the tree in 4 classes of <25%, 26-50%, 51-75%, 76-100% (NA, if not available)<br> Damage: Observed damages such as Main trunk broken, Branches broken, Hollow at base, Gaping cavity, Infected, Dried leaves (as on a dead branch) (NA, if not available)<br> Shape: Canopy shape of the focal tree (not species in general) categorised as Spreading, Oval, Fan, Column, Cone (NA, if not available)<br> Closure: Canopy closure due to foliage visually estimated standing next to trunk of focal tree and looking up, categorised as 0% (only sky and leafless branches visible), 1-25%, 26-50%, 51-75%, 76-100% (NA, if not available)<br> Seedlings: Count of conspecific seedlings (stems of girth at breast height <10 cm) around the focal tree in a 5 m radius (NA, if not available)<br> Saplings: Count of conspecific saplings (stems of girth at breast height 10-30 cm) around the focal tree in a 5 m radius (NA, if not available)<br> Trees: Count of conspecific trees (stems of girth at breast height >30 cm) around the focal tree in a 5 m radius (NA, if not available)<br> Remarks: Notes and additional information (NA, if not available)</p> <p><strong>3_Tree_centred_PCQ_ver2.csv</strong><br> Column: Description<br> FT_ID: Unique numeric linking ID of each focal tree in point-centred quarter (PCQ) plot<br> Focal_tree: Scientific name of focal tree species at the centre of the PCQ plot<br> Species: Scientific name of tree species recorded in PCQ plot around focal tree<br> GBH (cm): Girth of PCQ tree in cm, at 1.3 m from ground; measured from the higher side if tree is on a slope. Main stem only.<br> Distance: Distance from focal tree, in m; measured from the approximate centre of bole to centre of bole and not bark to bark<br> Multistem: NA if single-stemmed; if multi-stemmed, then GBH of additional stems given as notes.</p> <p><strong>4_Plant_checklist_ver2.csv</strong><br> Column: Description<br> Date: Date on which the survey was done<br> Place: Name of the place where the focal tree is located. e.g., Candura, Manamboli, Iyerpadi etc<br> Route: Route of the tree survey trail<br> Checklist_species: Scientific name of tree species observed as present along trail and within 10 m on either side<br> Remarks: Notes and additional information</p> <p><strong>5_Seed_Fruit_ver2.csv</strong><br> Column: Description<br> Sample: Serial number of sample of single winged fruit measured<br> Species: Scientific name of tree species<br> No_Seeds: Unit number of seed measured<br> Fresh_fruit_weight_g: Weight of each fruit measured on an Ohaus scale in grams<br> Nut_length_cm: Length of nut along the longitudinal axis in cm<br> Nut_width_1_cm: Width of nut in cm measured along axis perpendicular to nut length<br> Nut_width_2_cm: Width of nut in cm measured along axis perpendicular to nut length and nut width 1<br> Wing1_length_cm: Length of longer wing (sepal) in cm<br> Wing1_width_cm: Width of longer wing (sepal) in cm<br> Wing2_length_cm: Length of shorter wing (sepal) in cm<br> Wing2_width_cm: Width of shorter wing (sepal) in cm</p> <p><strong>06_Dipterocarpus_bourdillonii_survey_trails.kml</strong><br> This file includes the GPS tracks of the following seven trails in KML format:<br> 2021-01-30_Anali-Ayyankulam-Manamboli (Trail-2)<br> 2021-03-26_Ayyankulam (Trail-4)<br> 2021-04-10_Ayyankulam Parai (Trail-5)<br> 2022-03-07_Ayyankulam Parai to Ayyankulam_leftbank (Trail-8)<br> 2022-03-07_Ayyankulam Parai to Ayyankulam_rightbank (Trail-9)<br> 2022-03-09_Manamboli PH_leftbank (Trail-10)<br> 2022-03-09_Manamboli PH_rightbank (Trail-11)</p>
Evaluating the suitability of close-kin mark-recapture as a demographic modelling tool for a critically endangered elasmobranch population
<p>Estimating the demographic parameters of contemporary populations is essential to the success of elasmobranch conservation programmes, and to understanding their recent evolutionary history. For benthic elasmobranchs such as skates, traditional fisheries-independent approaches are often unsuitable as the data may be subject to various sources of bias, whilst low recapture rates can render mark-recapture programmes ineffectual. Close-kin mark-recapture (CKMR), a novel demographic modelling approach based on the genetic identification of close relatives within a sample, represents a promising alternative approach as it does not require physical recaptures. We evaluated the suitability of CKMR as a demographic modelling tool for the critically endangered blue skate (<em>Dipturus batis</em>) in the Celtic Sea using samples collected during fisheries-dependent trammel-net surveys that ran from 2011 to 2017. We identified three full-sibling and 16 half-sibling pairs among 662 skates, which were genotyped across 6,291 genome-wide single nucleotide polymorphisms (SNPs), 15 of which were cross-cohort half-sibling pairs that were included in a CKMR model. Despite limitations owing to a lack of validated life-history trait parameters for the species, we produced the first estimates of adult breeding abundance, population growth rate, and annual adult survival rate for <em>D. batis</em> in the Celtic Sea. The results were compared to estimates of genetic diversity, effective population size (N<sub>e</sub>), and catch per unit effort (CPUE) estimates from the trammel-net survey. Although each method was characterised by wide uncertainty bounds, together they suggested a stable population size across the time-series. Recommendations for the implementation of CKMR as a conservation tool for data-limited elasmobranchs are discussed. In addition, the spatio-temporal distribution of the 19 sibling pairs revealed a pattern of site-fidelity in <em>D</em>. <em>batis</em>, and supported field observations suggesting an area of critical habitat that could qualify for protection might occur near the Isles of Scilly.</p>
Figure 6 in A New Coccidian (Apicomplexa: Eimeriidae) in the Critically Endangered Central American River Turtle (Dermatemys Mawii) in Belize
Figure 6. Evolutionary relationships of Eimeria grayi n. sp. inferred by Bayesian analysis of partial 18S rRNA sequences. Posterior probabilities are shown at branch points. Toxoplasma gondii (EF472967) was selected as the outgroup. Eimeria grayi n. sp. is bolded and underlined.
Figure 3 in A New Coccidian (Apicomplexa: Eimeriidae) in the Critically Endangered Central American River Turtle (Dermatemys Mawii) in Belize
Figure 3. Light microscopic photomicrograph of sporulated oocyst of Eimeria grayi n. sp. Oocyst showing 2 of 3 surface projections (arrows) at 1 pole and a broader-based projection (arrowhead) from the opposite pole.
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.