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47 results for “micro-endemism”
FIGURE 7 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 7. Comparison of the dorsal patterns of adult males of three similar-looking Dixonius species: D. hangseesom (above), Dixonius chotjuckdikuli sp. nov. (middle) and D. pawangkhananti (below, tail partly generated).
FIGURE 3 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 3. Preserved type-series of Dixonius chotjuckdikuli sp. nov. A. Dorsal view. B. Ventral view. (MS 646 = male holotype CUMZ-R-2619; MS 641 = male paratype CUMZ-R-2614; MS 642 = male paratype CUMZ-R-2615; MS 643 = female paratype CUMZ-R-2616; MS 644 = female paratype CUMZ-R-2617; MS 645 = female paratype CUMZ-R-2618). Photos by M. Sumontha.
FIGURE 2 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 2. Preserved male holotype of Dixonius chotjuckdikuli sp. nov. A. Right profile of the head. B. Dorsal surface of the head. C. Ventral surface the head. D. Cloacal area, showing the precloacal pores. Photos by M. Sumontha.
FIGURE 6 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 6. Live juvenile individual (not collected) of Dixonius chotjuckdikuli sp. nov. in situ at the type-locality. Photo. by N. Chotjuckdikul.
FIGURE 5 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 5. Live subadult individual (not collected) of Dixonius chotjuckdikuli sp. nov. preying on a cricket in situ at the typelocality. Photo. by N. Chotjuckdikul.
FIGURE 1 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 1. Live adult male holotype of Dixonius chotjuckdikuli sp. nov. A. Lateral view. B. Dorsal view. Photos by N. Chotjuckdikul.
FIGURE 4 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 4. Dorsolateral view of a live adult female individual (not collected) of Dixonius chotjuckdikuli sp. nov. at the typelocality. Photo. by N. Chotjuckdikul.
FIGURE 10 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 10. Micro-habitat of Dixonius chotjuckdikuli sp. nov. at its type-locality on Khao Ebid, Khao Yoi District, Phetchaburi Province, western Thailand. Photo. by N. Chotjuckdikul.
FIGURE 9 in Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand
FIGURE 9. Khao Ebid, Khao Yoi District, Phetchaburi Province, western Thailand. Photo. by N. Chotjuckdikul.
FIGURE 2. Butia poni. A in Resurrection and epitypification of Butia poni (Arecaceae), a neglected palm micro-endemic in the grasslands of Misiones, Argentina
FIGURE 2. Butia poni. A. Basal part of the plant, showing the stems. B. Leaf sheath plus petiole. C. Fruits. D. Pistillate flowers. E. Fruits, in section showing the endocarp. F. Staminate flower. G. Staminate flower (A–F, from Keller et al. 13022).
FIGURE 4 in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 4. Comparison between Paepalanthus argenteus var. elatus (at right) and its neighboring population of P. argenteus var. argenteus (at left). A. Habit. B–F. Leaf: length (B), adaxial base (C), adaxial middle (D), abaxial apex (E), adaxial apex (F). G–H. Spathe: apex (G) and length (H). I–N. Capitulum: upper view (I), lateral view (J), early (K) to mature (N) development. (Photos: Wellerson Picanço)
FIGURE 3. Paepalanthus argenteus var. elatus. A, B. Habitat. C. Habit. D in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 3. Paepalanthus argenteus var. elatus. A, B. Habitat. C. Habit. D. Mature individual, showing inflorescences at various stages of development. E. Longitudinal section of the stem and leaf rosette, showing the yellowish caudex with marcescent leaf sheaths. F. Leaves, showing the striated indumentum on the abaxial surface and green appearance adaxially, and green scapes. G. Leaf abaxial surface, showing patent hairs and acuminate apex. H–K. Capitula in various developmental stages, from bud (H) to fruiting (K), all with long reflexed, acuminate involucral bracts; remarkable details are the capitula with staminate (I, at right, and K) and pistillate (I at left) flowers at anthesis, and the Diptera and Coleoptera flower visitors (J). (Photos: Livia Echternacht)
FIGURE 1 in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 1. Distribution map of Paepalanthus argenteus in the Espinhaço Range, Minas Gerais, Brazil. Map I. Paepalanthus argenteus var. argenteus studied vouchers. Map II. Area of occupancy of the only known population of P. argenteus var. elatus and the closest population of P. argenteus var. argenteus, Fechados district, Santana de Pirapama municipality.
FIGURE 6 in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 6. Scatter plot derived from the PCA of Paepalanthus argenteus var. argenteus (abbreviated as var. argenteus), of P. argenteus var. elatus (var. elatus) and of the neighboring population of var. argenteus to var. elatus.
FIGURE 2. Paepalanthus argenteus var. argenteus. A, B. Habitat. C–E in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 2. Paepalanthus argenteus var. argenteus. A, B. Habitat. C–E. Individuals representing morphological variants of the species. F–G. Rosettes of leaves showing variation in the indumentum: (F) indumentum similar to the type collection, from the population in the Fechados district neighboring P. argenteus var. elatus, (G) Individual from Diamantina. H–L. Variation in capitulum morphology from various stages of development. (Photos: Livia Echternacht)
FIGURE 5 in Reestablishment and recircumscription of Paepalanthus elatus (Eriocaulaceae, Poales), a threatened micro-endemic species from northern Serra do Cipó, Minas Gerais, Brazil
FIGURE 5. Graphs representing the minimum (a, b) and maximum (c, d) values of the continuous characters selected for the morphometric analyses of the ensemble of populations of Paepalanthus argenteus var. argenteus (abbreviated as var. argenteus), of P. argenteus var. elatus (var. elatus) (a, c) and of the neighboring population of var. argenteus to var. elatus (b, d). A. Length of the hairs on the leaf adaxial surface, [abbreviated Leaf – hair L (ad)]. B. Length of the hair on the leaf margins [Leaf – hair L (m)]. C. Length of the hair on the spathe [Spathe – hair L]. D. Length of the hair on the Scape [Scape – hair L]. E. Length of the involucral bracts [Inv. br. L]. F. Length of the involucral bracts surpassing the floral disc [Inv. br. – sup. L]. G. Length of the anthophore, in the staminate flowers [St. fl. – anth. L]. H. Diameter of the capitulum [Capitulum D]. All measures in millimeters; 'ns' = statistically not significant.
Data from: The demographic history of micro-endemics: Have rare species always been rare?
<p>Extinction has increased as human activities impact ecosystems. Conservation assessments for the IUCN red list are a fundamental tool in aiding the prevention of further extinction, yet, relatively few species have been thoroughly assessed. To increase the efficiency of assessments, novel approaches are needed to highlight threatened species that are currently data deficient. Many Madagascan plant species currently have extremely narrow ranges, but this may not have always been the case. To assess this, we used high-throughput DNA sequencing for 2-5 individuals of each species - reflecting the paucity of samples available for rare species. We estimated effective population size (<em>N</em><sub><em>e</em></sub>) for each species and compared this to census population <em>(N</em><sub><em>c</em></sub>) sizes when known. In each case, <em>N</em><sub><em>e</em></sub> was an order of magnitude larger than <em>N</em><sub><em>c</em></sub> – a signature of rapid, recent population decline. We then estimated the demographic history of each species, tracking changes in <em>N</em><sub><em>e</em></sub> over time. Five out of ten species displayed significant population declines towards the present (68–90% decreases). Our results for palm trees indicate that it is possible to predict extinction risk, particularly in the most threatened species. We performed simulations to show that our approach has the power to detect population decline during the Anthropocene, but performs less well when less data is used. Similar declines to those in palms were observed in data deficient species or those assessed as of least concern. These analyses reveal that Madagascar's narrow endemics were not always rare, having experienced rapid decline in their recent history. Our approach offers the opportunity to target species in need of conservation assessment with little prior information, particularly in regions where human modification of the environment has been rapid.</p>
Data from: The demographic history of micro-endemics: Have rare species always been rare?
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Data from: Species boundaries in the messy middle – testing the hypothesis of micro-endemism in a recently diverged lineage of coastal fog desert lichen fungi
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Micro-endemic species of snails and amphipods show population genetic structure across very small geographic ranges
<p class="MsoNormal"><span>Understanding variation in population genetic structure, even across small distances and for species with extremely limited ranges, is critical for conservation planning and the development of effective management strategies for imperiled species. Organisms that occupy the same geographic extent can maintain different population structures, ranging from highly diverged to panmictic. Such differences can result from differences in biological characteristics such as dispersal ability or demographic history. We used microsatellite loci to evaluate population genetic structure and variation of four desert spring invertebrates having high to low dispersal ability: the lung snail <em>Physa acuta</em>, two species of gilled snails (<em>Juturnia kosteri</em> and <em>Pyrgulopsis roswellensis</em>; family Hydrobiidae) and the amphipod <em>Gammarus desperatus</em>. The study location represents entire species ranges for the micro-endemic hydrobiids and <em>G. desperatus</em>, while <em>P. acuta</em> is ubiquitous throughout much of North America. We found little evidence of significant population genetic structure for <em>P. acuta</em><span> and </span><em>J. kosteri</em><span>,</span></span><em><span> </span></em><span>but much more for</span><em><span> </span></em><em><span>P. roswellensis </span></em><span>and </span><em><span>G. desperatus.</span></em><span> Our results demonstrate differences in habitat preference and/or dispersal ability between the species. While significant isolation-by-distance was detected in the two hydrobiids, dispersal is likely more limited in <em>P. roswellensis</em> than <em>J. kosteri</em>. This information provides insight into how gene flow shapes varying population genetic structure between species across small spatial scales (<100 km<sup>2</sup>). Most importantly, our results suggest that conservation agencies should not consider these microendemic species to be composed of single populations, but rather, that management plans for such species should account for population genetic variation across the species' ranges.</span></p>
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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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.