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549 results for “species extinction”
Projected climate change threatens significant range contraction of Cochemiea halei (Cactaceae), an island endemic, serpentine adapted plant species at risk of extinction
<p>Threats faced by narrowly distributed endemic plant species in the face of the Earth's sixth mass extinction and climate change exposure are especially severe for taxa on islands. We investigated the current and projected distribution and range changes of Cochemiea halei, an island endemic cactus. This taxon is of conservation concern, currently listed as vulnerable on the International Union for the Conservation of Nature Red List and as a species of special concern under Mexican federal law.</p> <p>The goals of this study are to 1). identify the correlations between climate variables and current suitable habitat for C. halei; 2). determine if the species is a serpentine endemic or has a facultative relationship with ultramafic soils; 3). predict range changes of the species based on climate change scenarios.</p> <p>Location: The island archipelago in Bahía Magdalena on the Pacific coast, Baja California Sur, Mexico.</p> <p>Main conclusions: The occurrence of the species is found to be strongly correlated with ultramafic soils. The most important climate predictor for habitat suitability is annual temperature range. The species is predicted to undergo range contractions from 21% to 53%, depending on the severity and duration of exposure to climate change. The broader implications for a wide range of narrowly adapted, threatened and endemic plant species indicate an urgent need for threat assessment based on habitat suitability and climate change modeling.</p>
FIGURE 1 in Genetic differentiation in the nearly extinct harlequin frogs (Bufonidae: Atelopus), with emphasis on the Andean Atelopus ignescens and A. bomolochos species complexes
FIGURE 1. Bayesian Majority-rule Consensus tree of the species of Atelopus included in this study.
FIG. 10 in Unexpected finding of a new Equus species (Mammalia, Perissodactyla) belonging to a supposedly extinct subgenus in late Pleistocene deposits of Khakassia (southwestern Siberia)
FIG. 10. — MT of Equus (S.) ovodovi n. sp., Proskuriakova Cave (Khakassia, Southwestern Siberia): A, no. 6, ventral view; B, no. 7, ventral view; C, no. 8, dorsal view. Scale bar: 3 cm.
FIG. 2. — Palatal fragment with P3 in Unexpected finding of a new Equus species (Mammalia, Perissodactyla) belonging to a supposedly extinct subgenus in late Pleistocene deposits of Khakassia (southwestern Siberia)
FIG. 2. — Palatal fragment with P3/-M1/ of both sides (IAES 21), holotype of Equus (S.) ovodovi n. sp., Proskuriakova Cave (Khakassia, Southwestern Siberia). Scale bar: 3 cm.
Figure 1 from: Wilkin P, Muasya AM (2015) Clarifying the Dioscorea buchananii Benth. species complex: a new potentially extinct subspecies for South Africa. PhytoKeys 48: 51-72. https://doi.org/10.3897/phytokeys.48.6806
Figure 1 - Dioscorea buchananii Benth. subsp. undatiloba vegetative and reproductive morphology A Habit of male plant with axillary inflorescences B Apical part of male inflorescence showing tepal shape and habit and bud shape C Rehydrated male flower with apical part of pedicel showing stamen morphology (NB tepal and stamen habit influenced by specimen preparation) D Fully opened out rehydrated male flower from above showing tepal shape, torus and pistillode E Female flower with ovary at late anthesis, tepals ascending F Female flower with 3 tepals removed showing torus, staminodia and gynoecium G Immature capsule with pedicel, floral bract and persistent tepals at apex H Leaf of KwaZuluNatal form of Dioscorea buchananii Benth. subsp. undatiloba. Scale bar: A, H 3 cm; B 7 mm; C, D, E 5 mm; F 3 mm; G 2 cm. From Breyer in TM 23387 (A), Junod 2182 (B, G), Medley Wood 11673 (C, D) Gerrard & McKen 1617 (E, F) Medley Wood 12969 (H). Drawn by Lucy Smith.
Figure 3 from: Wilkin P, Muasya AM (2015) Clarifying the Dioscorea buchananii Benth. species complex: a new potentially extinct subspecies for South Africa. PhytoKeys 48: 51-72. https://doi.org/10.3897/phytokeys.48.6806
Figure 3 - Dioscorea multiloba and Dioscorea rupicola colour photographs. A Upside down shoot of Dioscorea multiloba with male flowers B Female plant of Dioscorea multiloba with female flowers and immature capsules C Leaf and erect male inflorescence of Dioscorea rupicola showing habit of flowers. D Immature capsule of Dioscorea rupicola with persistent, erect, cucullate tepals at its apex. Photo A, B: Tony Abbott; C, D: Neil Crouch.
Figure 2 from: Wilkin P, Muasya AM (2015) Clarifying the Dioscorea buchananii Benth. species complex: a new potentially extinct subspecies for South Africa. PhytoKeys 48: 51-72. https://doi.org/10.3897/phytokeys.48.6806
Figure 2 - Dioscorea multiloba Kunth vegetative and reproductive morphology. A Habit of male plant with axillary inflorescences B Apical part of male inflorescence showing tepal shape and habit and bud shape habit C Lobed leaf showing venation of upper surface and forerunner tip D Male flower from above showing filament habit E Male flower with 3 tepals and part of torus removed showing torus shape, pistillode and associated concavities in torus surface F Female flower with 3 tepals and part of torus removed showing torus shape, staminodia and gynoecium G Female inflorescence showing tepal habit and ovaries H Infructescence showing some submature capsules with persistent tepals J Seed showing wing shape. Scale bar: A, C 3 cm; B 7 mm; D, E 4 mm; F 3 mm; G, H 2.5 cm; J 2 cm. From Ward 3076 (A, B, D, E), Medley Wood 329 (F, G), Gueinzius s.n. (H, J) and a photograph (C). Drawn by Lucy Smith.
Supplementary material 1 from: Saldarriaga-Gómez AM, Ardila-Robayo MC, Medem F, Vargas-Ramírez M (2023) Hope is the last thing lost: Colombian captive-bred population of the critically endangered Orinoco crocodile (Crocodylus intermedius) is a genetic reservoir that could help to save the species from extinction. Nature Conservation 53: 85-103. https://doi.org/10.3897/natureconservation.53.104000
Supplementary information
Assessing the impact of incomplete species sampling on estimates of speciation and extinction rates
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Data from: Color polymorphism influences species’ range and extinction risk
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Recent responses to climate change reveal the drivers of species extinction and survival
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Data from: Quantifying age-dependent extinction from species phylogenies
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Data from: A geographic test of species selection using planktonic foraminifera during the Cretaceous/Paleogene mass extinction
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Data from: How much does it cost to save a species from extinction? Costs and rewards of conserving the Lear’s macaw
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Data from: A multi-state dynamic occupancy model to estimate local colonization-extinction rates and patterns of co-occurrence between two or more interacting species
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Data from: Testosterone in ancient hair from an extinct species
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Projected climate change threatens significant range contraction of Cochemiea halei (Cactaceae), an island endemic, serpentine adapted plant species at risk of extinction
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Data from: Amphibian species' traits, evolutionary history, and environment predict Batrachochytrium dendrobatidis infection patterns, but not extinction risk
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Data from: Climate change-induced migration patterns and extinction risks of Theaceae species in China
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Data from: Geographic ranges of genera and their constituent species: structure, evolutionary dynamics, and extinction resistance
We explore the relationships among the geographic ranges of genera, the ranges and positions of their constituent species, and the number of species they contain, considering variation among coeval genera and changes within genera over time. Measuring range size as the maximal distance, or extent, between occurrences within a taxon, we find that the range of the most widespread species is a good predictor of the range of the genus, and that the number of species is a better predictor still. This analysis is complicated by a forced correlation: the range of a genus must be at least as large as that of each of its constituent species. We therefore focus on a second measure of range, the mean squared distance, or dispersion, of occurrences from the geographic centroid, which, by analogy to the analysis of variance, allows the total dispersion of a genus to be compared to the mean within-species dispersion and the dispersion among species centroids. We find that among-species dispersion is the principal determinant of genus dispersion. Within-species dispersion also plays a major role. The role of species richness is relatively small. Our results are not artifacts of temporal variation in the geographic breadth of sampled data. The relationship between changes in genus dispersion and changes in within- and among-species dispersion shows a symmetry, being similar in cases when the genus range is expanding and when it is contracting. We also show that genera with greater dispersion have greater extinction resistance, but that within- and among-species dispersion are not demonstrable predictors of survival once the dispersion of the genus is accounted for. Thus it is the range of the genus, rather than how it is attained, that is most relevant to its fate. Species richness is also a clear predictor of survival, beyond its effects on geographic range.
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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.