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609 results for “Critically endangered”
FIGURE 3 in Passiflora nebulosae (Passifloraceae, subgenus Tryphostemmatoides) a distinctive new critically endangered species discovered in the Colombian Andes
FIGURE 3. Mature plant of Passiflora nebulosae Restrepo & Ocampo. A. Branch with leaves, flowers, and young tendrils. B. Glands in leaf margin. C. Node with detail of setaceous stipule. D. Detail of petiole with the round minute sessile glands at the apex. E. Tendril ending in adhering disc. F. Terminal branch. G. Cauliflorous floral bud. H. Closed flower in post-anthesis. I. Open flower. J. Schematic detail of a longitudinal section of the flower. K. Immature fruit. Photographs of the type specimen by Jorge Restrepo, John Ocampo and Andrés F. Atehortúa (J.J Restrepo, W. Giraldo & J. Ocampo 852; MEDEL!).
FIGURE 2 in Passiflora nebulosae (Passifloraceae, subgenus Tryphostemmatoides) a distinctive new critically endangered species discovered in the Colombian Andes
FIGURE 2. Mature plant of Passiflora nebulosae Restrepo & Ocampo. A. Detail of a flowering branch with tendrils. B. Cauliflorous floral bud. C. Node with detail of setaceous stipule, petiole glands, and glands in leaf margin. D. Detail of petiole with round minute sessile glands at the apex. E. Schematic detail of a longitudinal section of the flower. F. Immature fruit. Drawn by Benjamin Cardenas from holotype (J.J. Restrepo, W. Giraldo & J. Ocampo 852; MEDEL!).
FIGURE 1 in Passiflora nebulosae (Passifloraceae, subgenus Tryphostemmatoides) a distinctive new critically endangered species discovered in the Colombian Andes
FIGURE 1. Geographical distribution of Passiflora nebulosae (red circles) in the department of Antioquia, Andean region of Colombia.
FIGURE 2. A. Alwyn H in Magnolia lozanoi (Magnolia subsect. Dugandiodendron, Magnoliaceae) rediscovered on Ecuadorian "tepuis" in Reserva Biológica El Quimi, Cordillera del Cóndor: critically endangered by open-pit mining
FIGURE 2. A. Alwyn H. Gentry (Clay Center, Kansas, 6 Jan 1945–Guayaquil, Ecuador, 3 Aug 3 1993), outstanding botanist who dedicated his life to the exploration, collection and study of tropical plants. Many species are named after him, including Magnolia gentryi Vázquez in Vázquez-García et al. (2012: 104), from Oxapampa, Peru. Several of his magnolia collections have been designated as types and have helped to understand this group of plants. Photograph by Robert Gradstein in 1991 in Parque Nacional Amboró, Bolivia. B. Gustavo Lozano-Contreras (Bogotá, 22 May 1938–Bogotá, 10 July 2000), a true scholar of the Colombian flora. Among the several groups of flowering plants that he studied, he devoted many years to the study of Neotropical Magnoliaceae. Photograph by Pedro Ruiz in 1976; reprinted with permission from Caldasia.
FIGURE 1. Magnolia lozanoi. A. Habit. B in Magnolia lozanoi (Magnolia subsect. Dugandiodendron, Magnoliaceae) rediscovered on Ecuadorian "tepuis" in Reserva Biológica El Quimi, Cordillera del Cóndor: critically endangered by open-pit mining
FIGURE 1. Magnolia lozanoi. A. Habit. B. Branch showing the underside of the leaves covered by a black mycelium. C. Flower in female phase. D. Flower in male phase. E. Leaf beetle (Chrysomelidae, Alticinae) foraging on the stamens and stigmas. F. Fruits. (A, B, C and F from Pérez et al. 11419, D from Pérez et al. 11421, E from Pérez et al. 11461, all QCA). Photographs by Álvaro J. Pérez.
FIGURE 4 in Magnolia lozanoi (Magnolia subsect. Dugandiodendron, Magnoliaceae) rediscovered on Ecuadorian "tepuis" in Reserva Biológica El Quimi, Cordillera del Cóndor: critically endangered by open-pit mining
FIGURE 4. Habitat of Magnolia lozanoi in the Cordillera del Cóndor, El Quimi Biological Reserve. A, B and C. Broad plateau of the Hollín sandstone formation, the so-called Andean "tepui". B and C. Open tepui-like bromeliad sward and elfin forest. A and B from the photographic archive of the Escuela Politécnica Nacional, RAP 1993. C by Álvaro J. Pérez.
FIGURE 3 in Magnolia lozanoi (Magnolia subsect. Dugandiodendron, Magnoliaceae) rediscovered on Ecuadorian "tepuis" in Reserva Biológica El Quimi, Cordillera del Cóndor: critically endangered by open-pit mining
FIGURE 3. Distribution of Magnolia lozanoi in the Cordillera del Cóndor, Morona-Santiago, southeastern Ecuador.
Fig. 3 in Ex-situ cultivation at lower altitude and evaluation of Swertia chirayita, a critically endangered medicinal plant of Sikkim Himalayan region, India
Fig. 3. An image of HPTLC plate at UV 254 nm showing swertiamarin content, track 1: standard swertiamarin, track 2: swertiamarin content in stem (niche environment), track 3: swertiamarin content in leaves (niche environment), track 4: swertiamarin content in leaves (ex-situ cultivated plant) (a); HPTLC densitogram of swertiamarin standard (b), stem (niche environment) (c), leaves (niche environment) (d) and leaves (ex-situ cultivated plant) (e), [x-axis represent retention factor (Rf) & y-axis represent absorption unit (AU)].
Fig. 1 in Ex-situ cultivation at lower altitude and evaluation of Swertia chirayita, a critically endangered medicinal plant of Sikkim Himalayan region, India
Fig. 1. Fully mature crop cultivated in niche environment (a), fully mature dried harvested plants from niche environment (b), one-year-old ex-situ cultivated plants at lower altitude (c), freshly harvested leaves from one-year-old ex-situ cultivated plants (d) and leaf: sessile leaves of fully mature plant cultivated in niche environment (left) and petiolated leaves of oneyear-old ex-situ cultivated plants (right) (e).
Data from: Specific alleles at immune genes, rather than genome-wide heterozygosity, are related to immunity and survival in the critically endangered Attwater's prairie-chicken
The negative effects of inbreeding on fitness are serious concerns for populations of endangered species. Reduced fitness has been associated with lower genome-wide heterozygosity and immune gene diversity in the wild; however, it is rare that both types of genetic measures are included in the same study. Thus, it is often unclear whether the variation in fitness is due to the general effects of inbreeding, immunity-related genes or both. Here, we tested whether genome-wide heterozygosity (20 990 SNPs) and diversity at nine immune genes were better predictors of two measures of fitness (immune response and survival) in the endangered Attwater's prairie-chicken (Tympanuchus cupido attwateri). We found that postrelease survival of captive-bred birds was related to alleles of the innate (Toll-like receptors, TLRs) and adaptive (major histocompatibility complex, MHC) immune systems, but not to genome-wide heterozygosity. Likewise, we found that the immune response at the time of release was related to TLR and MHC alleles, and not to genome-wide heterozygosity. Overall, this study demonstrates that immune genes may serve as important genetic markers when monitoring fitness in inbred populations and that in some populations specific functional genes may be better predictors of fitness than genome-wide heterozygosity.
Data from: Introgression threatens the survival of the critically endangered freshwater crayfish Cherax tenuimanus (Decapoda : Parastacidae) in the wild
Hybridization and genetic introgression following the introduction of exotic species can pose a significant threat to the survival of geographically restricted species. A remnant population of the critically endangered freshwater crayfish Cherax tenuimanus in the upper reaches of the Margaret River in southwestern Australia is under threat following the introduction and spread of its congener Cherax cainii. Here, we examine the extent of hybridization and introgression between the two species using twelve polymorphic microsatellite loci. Our study reveals there are three times more C. cainii than C. tenuimanus at our study site in the upper reaches of the Margaret River. There is also evidence of hybridization and introgression between C. tenuimanus and C. cainii at this site, with F1, F2 and backcrossed individuals identified. While interbreeding was confirmed in this study, our simulations suggest that the levels of introgression are much lower than would be expected under random mating, indicating partial reproductive barriers exist. Nevertheless, it is apparent that hybridization and introgression with C. cainii pose a serious threat to C. tenuimanus and their survival in the wild will require active adaptive management and continued genetic monitoring to evaluate management effectiveness.
Data from: An empirical and mechanistic explanation of abundance-occupancy relationships for a critically endangered nomadic migrant
The positive abundance-occupancy relationship (AOR) is a pervasive pattern in macroecology. Similarly, the association between occupancy (or probability of occurrence) and abundance is also usually assumed to be positive and in most cases constant. Examples of AORs for nomadic species with variable distributions are extremely rare. Here we examined temporal and spatial trends in the AOR over seven years for a critically endangered nomadic migrant which relies on dynamic pulses in food availability to breed. We predicted a negative temporal relationship, where local mean abundances increase when the number of occupied sites decreases, and a positive relationship between local abundances and the probability of occurrence. We also predicted that these patterns are largely attributable to spatiotemporal variation in food abundance. The temporal AOR was significantly negative and annual food availability was significantly positively correlated with the number of occupied sites, but negatively correlated with abundance. Thus, as food availability decreased, local densities of birds increased, and vice-versa. The abundance - probability of occurrence relationship was positive and non-linear, but varied between years due to differing degrees of spatial aggregation caused by changing food availability. Importantly, high abundance (or occupancy) did not necessarily equate to high quality habitat and may be indicative of resource bottlenecks or exposure to other processes affecting vital rates. Our results provide a rare empirical example that highlights the complexity of AORs for species that target aggregated food resources in dynamic environments.
FIGURE 4 in Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius
FIGURE 4. Distribution of the new species Eugenia alletiana on Mauritius. Each point is 1 km across.
FIGURE 3. A in Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius
FIGURE 3. A. Foliage with unripe fruits; B. Ripe fruit; C. Variation in external surface of the woody endocarp (all from a single plant); D. Longitudinal cross-section of the endocarp; E. Seed, showing bullate outer surface on the left and smooth adaxial surface of cotyledon on the right (dark brown); F. Seedling still attached to endocarp (A-Le Pouce, others Brise Fer).
FIGURE 2. A in Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius
FIGURE 2. A. Flower bud showing fused apex; B. Flower bud showing teeth (bottom left); C. Flower with irregularly ruptured hypanthium lobes (5 lobes on the left, 4 lobes on the right). D. Stamens distribution on the inner surface of a split hypanthium; E. Side view of flower showing diminutive white petals at ends of split hypanthium lobes; F. Detail of stamens and a petal (all Brise Fer).
FIGURE 1. A in Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius
FIGURE 1. A. Tree; B–C. Bark; D. Leaf, adaxial surface; E. Leaf, abaxial leaf; F. Foliage with flower buds; G. Flower bud (A–C Le Pouce, others Brise Fer).
FIGURE 1. Field pictures. A. Climbing a in First record of the critically endangered Hydrangea steyermarkii Standl. (Hydrangeaceae) in Mexico, and description of a new widespread Hydrangea species of Mesoamerica
FIGURE 1. Field pictures. A. Climbing a Hydrangea host tree with specific equipment (Tapalapa, Chiapas, Mexico). B. Branch of Hydrangea albostellata with four inflorescences, all inflorescence bracts already shed in lower right one where the flower buds are visible, lower left inflorescence partially opened, apical inflorescences still covered by all inflorescence bracts (M.S. Samain & E. Martínez S. 2012-090).
FIGURE 4. Hydrangea albostellata. A in First record of the critically endangered Hydrangea steyermarkii Standl. (Hydrangeaceae) in Mexico, and description of a new widespread Hydrangea species of Mesoamerica
FIGURE 4. Hydrangea albostellata. A. Habitus of branch with inflorescences in different developmental stages (inflorescence buds, inflorescence with flower buds and infructescence). B. Enlarged marginal flower with two pistils with fertile stigmas. C. Functionally male flower with 8 fertile stamens and 2 reduced pistils. D. Maturing capsule, fertile stigmas still visible, seeds are released through the opening between the 2 pistils. E. Detail of abaxial leaf surface with stellate indument. Drawn by Ramiro Cruz Durán from the holotype M.S. Samain et al. 2012-023 (MEXU; A, B), and from the specimens M.S. Samain et al. 2012-021 (MEXU; A, D, E) and M.S. Samain & E. Martínez S. 2012-088 (MEXU; C).
FIGURE 3 in First record of the critically endangered Hydrangea steyermarkii Standl. (Hydrangeaceae) in Mexico, and description of a new widespread Hydrangea species of Mesoamerica
FIGURE 3. SEM pictures of flowers of Hydrangea albostellata (A–D; A, C, M.S. Samain et al. 2012-023. B, D–E: M.S. Samain & E. Martínez S. 2012-088) and Hydrangea steyermarkii (E–F, M.S. Samain et al. 2012-078). A. Central parts of marginal female flower, with two large pistils and 3 small stamens visible. B. Flower bud of male flower; note the campanulate hypanthium and the valvate petals. C. Mature fruit opened between the pistils to release the seeds. D. Male flower; note the extreme difference in size between the long stamens and the diminute pistils. E. Lateral view of male flower. F. Apical view of male flower.
FIGURE 2. Field pictures. A–B in First record of the critically endangered Hydrangea steyermarkii Standl. (Hydrangeaceae) in Mexico, and description of a new widespread Hydrangea species of Mesoamerica
FIGURE 2. Field pictures. A–B, Hydrangea albostellata, C–D, Hydrangea steyermarkii (M.S. Samain et al. 2012-010). A. Branch with one mature green inflorescence with old male flowers and inflorescence axes with the basal lignified parts of inflorescences of previous years (M.S. Samain et al. 2012-005). B. Abaxial leaf side with dense pubescence consisting of whitish stellate hairs, note the typical spoon-shape and broadly revolute margin (M.S. Samain & E. Martínez S. 2012-090). C. Young branch, many-ribbed, with typical brownish-reddish cortex which contracts and forms corchy patches. D. Abaxial side of young leaf with whitish stellate indument, the leaf surface typically red-brown, the margin crenate with the marked bright green glandular teeth.
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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)
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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.